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目錄
美國
證券交易委員會
華盛頓特區20549
_______________________
表格 10-Q
根據1934年證券交易所法案第13或15(d)條的季報告
截至季度結束2024年9月30日
在過渡期從 到
委員會檔案編號 001-34223
_______________________
CH Logo_RED_rgb.jpg
CLEAN HARBORS, INC.
(依憑章程所載的完整登記名稱)
麻薩諸塞州04-2997780
(成立或組織的州或其他轄區)(國稅局雇主身份識別號碼)
42 Longwater DriveNorwell馬薩諸塞州02061-9149
(總部地址)(郵政編碼)
註冊人電話號碼,包括區號: (781) 792-5000
根據法案第12(b)條規定註冊的證券:
每種類別的名稱交易符號每個註冊交易所的名稱
普通股,每股面值0.01美元CLH紐約證券交易所
請打勾表示:(1)在過去12個月內(或規定申報此類報告之較短時期內),已依據1934年證券交易所法第13條或第15(d)條的規定提交所有要求申報的報告;和(2)在過去90天內一直受到此項申報要求的影響。  
勾選表示該登記人是否在過去12個月內(或者對於該登記人需要提交這些檔案的較短時間內)根據Regulation S-t的第405條要求提交了每個互動數據檔案。   
請以錄取標記表示是否申報人是一家大型迅速成長的檔案公司、一家迅速成長的檔案公司、一家非迅速成長的檔案公司、一家較小的申報公司或一家新興增長公司。請參見「大型迅速成長的檔案公司」、「迅速成長的檔案公司」、「較小的申報公司」和「新興增長公司」在《交易所法》第120億2條的定義。(選擇一個):
大型加速歸檔人加速歸檔人
非加速歸檔人小型報告公司
新興成長型企業
如果一家新興成長型公司,請用勾選標記表示該申報人已選擇不使用根據證交所法案13(a)條款提供的任何新的或修訂過的財務會計準則的延長過渡期。
勾選方框表示申報人是否為空殼公司(如《交易所法》第120億2條所定)。是
2024年10月25日,登記公司普通股$0.01面值的持股數目為 53,899,103.



CLEAN HARBORS, INC.
第10-Q表格季度報告
目 錄
頁碼。




目錄
禮本達有限公司及其附屬公司
合併資產負債表
(以千為單位)
2024年9月30日2023年12月31日
資產(未經審計)
流動資產:
現金及現金等價物$512,371 $444,698 
短期有價證券82,371 106,101 
應收賬款,扣除$賬面值的呆賬48,570 15.142,209,分別為
1,100,660 983,111 
未計費應收賬款204,308 107,859 
存貨和補給品376,564 327,511 
預付費用及其他流動資產78,204 82,939 
全部流動資產2,354,478 2,052,219 
不動產、廠房及設備淨值2,452,312 2,193,318 
其他資產:
營運租賃權使用資產246,061 187,060 
商譽1,485,065 1,287,736 
許可證和其他無形資產,淨值708,935 602,797 
其他長期資產59,159 59,739 
其他總資產2,499,220 2,137,332 
資產總額$7,306,010 $6,382,869 
負債及股東權益
流動負債:
長期債務的當期償還$15,102 $10,000 
應付賬款504,206 451,806 
逐步認列的收入103,291 95,230 
應計費用及其他流動負債398,236 397,157 
終止、永久閉鎖及矯正責任之流動部分30,477 26,914 
營運租賃負債的流動部分70,539 56,430 
流動負債合計1,121,851 1,037,537 
其他負債:
關閉和後關閉負債,減去資產當期部分 $14,203 15.113,556,分別為
105,375 105,044 
補救負債,減去資產當期部分 $16,274 15.113,358,分別為
94,384 97,885 
長期負債,不含流動部分2,773,659 2,291,717 
營業租賃負債,扣除當前部分179,040 131,743 
递延所得税负债356,150 353,107 
其他長期負債147,241 118,330 
其他負債總額3,655,849 3,097,826 
承諾和條件性負債(見附註15)
股東權益:
0.010.01 每股面額:
已授權 80,000,000$53,898,80553,929,703 分別為股份
539 539 
資本公積額額外增資438,904 459,728 
累積其他全面損失(192,036)(175,339)
保留收益2,280,903 1,962,578 
股東權益總額2,528,310 2,247,506 
負債和股東權益總額$7,306,010 $6,382,869 

附註是這些未經審計的合併財務報表的一個不可分割的部分。
1

目錄
禮本達有限公司及其附屬公司
未經審核的綜合營業損益表
(以千為單位,除每股金額外)
結束於三個月的期間九個月結束了
九月三十日,九月三十日,
2024202320242023
收入:
服務收入$1,278,955 $1,129,216 $3,719,183 $3,341,539 
產品收入250,467 236,480 739,653 729,444 
總收益1,529,422 1,365,696 4,458,836 4,070,983 
營收成本: (不包括以下列明的款項)
服務收入872,829 765,004 2,539,569 2,288,199 
產品收入182,770 178,947 522,642 534,778 
總營業成本1,055,599 943,951 3,062,211 2,822,977 
銷售、一般及管理費用177,846 171,019 557,590 505,154 
環保母基增值3,618 3,388 10,139 10,281 
折舊與攤提100,063 92,970 295,632 267,425 
營業收入192,296 154,368 533,264 465,146 
其他(支出)收入,淨額(1,123)334 (2,431)(833)
提早償還債務的損失   (2,362)
利息費用,扣除利息收入淨額$5,391, $2,877, $13,2577,833,分別為
(35,779)(29,696)(100,767)(80,400)
所得税前淨利155,394 125,006 430,066 381,551 
所得税费用40,181 33,666 111,741 102,044 
凈利潤$115,213 $91,340 $318,325 $279,507 
每股盈餘:
基礎$2.14 $1.69 $5.90 $5.17 
稀釋$2.12 $1.68 $5.87 $5.14 
用於計算基本每股收益的股份53,951 54,122 53,936 54,097 
用於計算稀釋每股收益的股份54,229 54,419 54,229 54,411 
    

所附註釋是這些未經審計的合併財務報表的組成部分。
2

目錄
凱富環境公司及其子公司
未經審計的綜合損益表
(以千爲單位)
 三個月之內結束九個月結束
2020年9月30日2020年9月30日
 2024202320242023
淨收入$115,213 $91,340 $318,325 $279,507 
其他綜合損失,稅後淨額:
可供出售證券未實現收益262 93 170 311 
利率對沖工具公允價值未實現(損失)收益(9,361)7,801 2,406 15,528 
淨利潤中實現的利率對沖金額的重分類調整(3,806)(3,650)(11,260)(12,704)
利率對沖結算的重分類調整   (5,905)
養老金調整項(10)6 18 (1)
外幣翻譯調整5,369 (7,423)(8,031)813 
其他綜合損失,淨額(7,546)(3,173)(16,697)(1,958)
綜合收益$107,667 $88,167 $301,628 $277,549 

所附註釋是這些未經審計的合併財務報表的組成部分。
3

目錄
凱富環境公司及其子公司
未經審計的現金流量表
(以千爲單位)
九個月已結束
九月三十日
20242023
來自經營活動的現金流:
淨收入$318,325 $279,507 
爲覈對淨收益與經營活動淨現金而進行的調整:
折舊和攤銷295,632 267,425 
可疑賬款備抵金5,674 2,620 
遞延融資成本和債務折扣的攤銷4,623 4,036 
環境負債的增加10,139 10,281 
環境負債估算值的變化4,347 3,258 
遞延所得稅(418)(356)
其他費用,淨額2,431 833 
基於股票的薪酬20,690 14,809 
提前清償債務造成的損失 2,362 
環境支出(19,679)(24,064)
扣除收購後的資產和負債變化:
應收賬款和未開票的應收賬款(145,647)(46,445)
庫存和供應(39,673)12,691 
其他流動和長期資產
(47,826)(18,190)
應付賬款30,004 (40,013)
其他流動和長期負債35,211 (13,062)
經營活動產生的淨現金473,833 455,692 
用於投資活動的現金流:
不動產、廠房和設備的增加(369,826)(311,906)
出售和處置固定資產的收益6,353 5,129 
收購,扣除獲得的現金(474,011)(119,596)
出售業務的收益750 750 
無形資產的增加,包括獲得或續訂許可證的費用(2,545)(1,507)
購買可供出售證券(73,682)(104,329)
出售可供出售證券的收益100,021 84,390 
用於投資活動的淨現金(812,940)(447,069)
來自(用於)融資活動的現金流:
未兌現支票的變更(5,852)3,004 
與既得限制性股票預扣稅相關的納稅款項(11,514)(10,886)
回購普通股(30,215)(18,000)
已支付的遞延融資費用(8,316)(6,371)
融資租賃的付款(23,596)(11,594)
債務本金支付(11,327)(621,475)
減去折扣後的債務發行收益499,375 500,000 
從循環信貸額度借款 114,000 
循環信貸額度付款 (114,000)
來自(用於)融資活動的淨現金408,555 (165,322)
匯率變動對現金的影響(1,775)61 
現金和現金等價物的增加(減少)67,673 (156,638)
現金和現金等價物,期初444,698 492,603 
現金和現金等價物,期末$512,371 $335,965 
補充信息:
利息和所得稅的現金支付:
已付利息$134,177 $100,813 
已繳的所得稅,扣除退款100,752 107,328 
非現金投資活動:
應計財產、廠房和設備43,604 29,127 
爲換取經營租賃負債而獲得的ROU資產98,927 61,741 
爲換取融資租賃負債而獲得的ROU資產53,391 26,317 
所附註釋是這些未經審計的合併財務報表的組成部分。


4

目錄
凱富環境公司及其子公司
未經審計的股東權益合併報表
(以千爲單位)
普通股累積的
其他
綜合虧損
編號

股份
$0.01
單位:美元。
數值
共計
實收
資本
未分配利潤
股東的
股權
2024年1月1日的餘額53,930 $539 $459,728 $(175,339)$1,962,578 $2,247,506 
淨收入— — — — 69,832 69,832 
其他綜合損失— — — (4,287)— (4,287)
以股票爲基礎的報酬計劃— — 6,338 — — 6,338 
發行普通股以用於限制股份解禁,扣除員工稅款23 — (3,052)— — (3,052)
購回普通股(27)— (5,000)— — (5,000)
2024年3月31日結存餘額53,926 539 458,014 (179,626)2,032,410 2,311,337 
淨收入— — — — 133,280 133,280 
其他綜合損失— — — (4,864)— (4,864)
以股票爲基礎的報酬計劃— — 8,515 — — 8,515 
發行普通股用於限制性股票解鎖,淨員工稅款扣除27 — (1,547)— — (1,547)
購回普通股(23)— (5,000)— — (5,000)
2024年6月30日餘額53,930 539 459,982 (184,490)2,165,690 2,441,721 
淨收入— — — — 115,213 115,213 
其他綜合損失— — — (7,546)— (7,546)
以股票爲基礎的報酬計劃— — 5,837 — — 5,837 
發行普通股用於受限股份解禁,減去員工稅款代扣54 1 (6,916)— — (6,915)
購回普通股(85)(1)(19,999)— — (20,000)
2024年9月30日的餘額53,899 $539 $438,904 $(192,036)$2,280,903 $2,528,310 


5

Table of Contents
CLEAN HARBORS, INC. AND SUBSIDIARIES
UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (CONTINUED)
(in thousands)
普通股累積的
其他
綜合虧損
編號

股份
$0.01
單位:美元。
數值
共計
實收
資本
未分配利潤
股東的
股權
2023年1月1日餘額54,065 $541 $504,240 $(167,181)$1,584,722 $1,922,322 
淨收入— — — — 72,401 72,401 
其他綜合損失— — — (14,346)— (14,346)
以股票爲基礎的報酬計劃— — 6,018 — — 6,018 
發行普通股用於受限股權解鎖,扣除員工稅款後的淨利潤49 — (3,351)— — (3,351)
購回普通股(22)— (3,000)— — (3,000)
2023年3月31日的餘額54,092 541 503,907 (181,527)1,657,123 1,980,044 
淨收入— — — — 115,766 115,766 
其他綜合收益— — — 15,561 — 15,561 
以股票爲基礎的報酬計劃— — 4,500 — — 4,500 
發行普通股以供限制股份解禁,扣除員工稅款34 — (984)— — (984)
購回普通股(36)— (5,001)— — (5,001)
2023年6月30日的餘額54,090 541 502,422 (165,966)1,772,889 2,109,886 
淨收入— — — — 91,340 91,340 
其他綜合損失— — — (3,173)— (3,173)
以股票爲基礎的報酬計劃— — 4,291 — — 4,291 
發行普通股以支付受限股份的解鎖,扣除員工稅款71 1 (6,552)— — (6,551)
購回普通股(58)(1)(9,998)— — (9,999)
2023年9月30日結餘54,103 $541 $490,163 $(169,139)$1,864,229 $2,185,794 

所附註釋是這些未經審計的合併財務報表的組成部分。
6

目錄
凱富環境公司及其子公司
未經審計的合併財務報表附註

(1) 提供的基礎
附註的合併中期財務報表尚未經審計,包括clean harbors公司及其子公司的帳戶(以下簡稱爲「clean harbors公司」或「本公司」),並根據證券交易委員會(「SEC」)的規定和法規編制,據管理層的意見,已包括所有屬於正常循環性質的調整,併爲呈現所述期間的財務狀況、經營業績和現金流需要的公允陳述進行了準備。管理層對公司合併中期財務報表及相關附註所報金額進行了估計和假設;實際結果可能與這些估計和判斷有所不同。中期期間的結果未必能反映整個年度或其他任何中期間的結果。本處呈現的財務報表應與公司截至2023年12月31日的年度10-k表中包含的財務報表一起閱讀。

(2) 重要會計政策
公司的重要會計政策詳見於公司2023年12月31日年度報告第10-K表格的附註2「重要會計政策」中。

尚未採用的會計聲明

2023年11月,財務會計準則委員會("FASB")發佈了會計準則更新("ASU")2023-07號,《板塊報告(主題280):報告板塊費用披露改進》,要求在年度和中期基礎上增強對重要板塊費用的披露。該指導將於2024年1月1日開始的公司年度期間生效,並從2025年1月1日開始的中期生效。允許提前採用。採納後,指導應按照所有在基本報表中呈現的先前期間進行追溯應用。本ASU的要求與披露有關,不會影響公司的財務狀況、經營業績或現金流量。公司目前正在評估採納該ASU對其可報告板塊披露的影響。》,要求在年度和中期基礎上增強對重要板塊費用的披露。該指導將於2024年1月1日開始的公司年度期間生效,並從2025年1月1日開始的中期生效。允許提前採用。採納後,指導應按照所有在基本報表中呈現的先前期間進行追溯應用。本ASU的要求與披露有關,不會影響公司的財務狀況、經營業績或現金流量。公司目前正在評估採納該ASU對其可報告板塊披露的影響。》,要求在年度和中期基礎上增強對重要板塊費用的披露。該指導將於2024年1月1日開始的公司年度期間生效,並從2025年1月1日開始的中期生效。允許提前採用。採納後,指導應按照所有在基本報表中呈現的先前期間進行追溯應用。本ASU的要求與披露有關,不會影響公司的財務狀況、經營業績或現金流量。公司目前正在評估採納該ASU對其可報告板塊披露的影響。

2023年12月,FASB發佈了ASU編號2023-09,所涉及的是《收入稅(主題740)》控件 所得稅披露改進,該指南增強了與稅率對賬和已交所得稅有關的收入稅披露。該指南將於2025年12月31日年度開始生效。允許提前採用。採納後,可前瞻性或回顧性應用該指南。本ASU的要求與披露有關,不會對公司的財務狀況、經營成果或現金流產生影響。公司目前正在評估採用該ASU對其所得稅披露的影響。

2024年3月,SEC根據SEC發佈編號33-11275採納了最終規則。 增強和標準化爲投資者提供的與氣候相關的披露規則要求披露,包括但不限於:重大氣候相關風險;減輕或適應此類風險的活動;管理此類風險的治理和管理;以及重大範圍1和範圍2溫室氣體排放量。此外,該規則要求在基本報表附註中披露嚴重天氣事件和其他自然情況的影響,但須符合一定的重大性門檻。該規則將在分階段時間表上生效,從截至2025年12月31日的年度開始。2024年4月4日,SEC自願暫停執行最終規則,以促進對規則的未決法律挑戰有序的司法解決。公司目前正在監視法律挑戰,並評估最終規則以判斷其對公司合併財務報表和披露的潛在影響。

(3) 營業費用
公司通過以下經營部門產生營業收入:環保服務和Safety-Kleen可持續解決方案(「SKSS」)。 公司的環保服務經營部門通常具有 四個 營業收入來源,而SKSS經營部門具有 兩個 營業收入來源。 公司按地理位置和營業來源對第三方營業收入進行細分,因爲管理層認爲這些類別描繪了營業收入和現金流受經濟因素影響的方式。 公司的主要營業收入來源包括:
7

目錄
技術服務技術服務爲環保母基運營部門的營業收入做出了貢獻。這些服務的營業收入來自於對廢物管理和處置服務收取的費用,包括現場環境管理服務、收集和運輸、包裝、回收、處理和處置廢物以及整治項目。這些服務處理有害和/或非有害廢物,包括全氟烷基和聚全氟烷基物質(「PFAS」)。營業收入主要來自於短期項目,其中大部分由長期性質的主服務協議管理。這些主服務協議通常與公司較大的客戶簽訂,並概述了這些安排的定價和法律框架。服務是根據購買訂單或與客戶的協議提供的,幷包括基於廢物、材料和人員成本以及運輸和其他費用的價格。收集和運輸收入隨着時間的推移計入,隨着客戶在執行過程中接收和消耗服務的利益,並且公司有權利就已完成的表現而獲得支付。公司使用輸入法來隨時間確認收入,基於時間和材料支出作爲測量履約責任滿意度的基礎。處理和廢物處置的營業收入在處理完成、最終安排在填埋場或焚化爐處置結束,或者將廢物運往第三方進行處理和清除時確認。公司定期進行收集、運輸和廢物處置的捆綁安排。對於這種安排,運輸和處置被視爲獨立的履約責任,公司根據各自的獨立銷售價格(即客戶在獨立基礎上預計支付服務的價格)分配營業收入。尚未完全處理和處理的廢物的營業收入和相關成本被推遲。待服務完成後,推遲的收入和成本得到確認。收集和運輸與最終處理和清除之間的時間段因客戶地點而異,但一般以日爲單位。
工業服務工業服務爲環保母基經營部門的營業收入做出貢獻。 這些營業收入主要來自於在北美爲煉油廠、化工廠、製造工廠、發電公司和其他工業客戶提供的工業和特殊服務。 服務包括廠內清潔和維護服務、廠區停工和輪換服務、專業清潔服務,包括化學清潔、管道清洗和高壓和超高壓水清洗,泄漏檢測和修理,採光照明,生產服務和上游能源服務。 服務是基於購買訂單或客戶協議提供的,包括設備、材料和人員的日常、小時或作業價格。 公司按照時間來確認這些服務的營業收入,因爲客戶在服務進行時接收並消費服務的好處,公司有權獲得迄今爲止完成的履約的支付。 公司使用輸入法來按照時間確認營業收入,根據發生的時間和材料。
Field and Emergency Response Services—Field and Emergency Response Services contribute to the revenues of the Environmental Services operating segment. Field Services revenues are generated from cleanup services at customer sites, including those managed by municipalities and utility providers, or other locations on a scheduled or emergency response basis. Services include confined space entry for tank cleaning, site decontamination, environmental remediation, railcar cleaning, manhole/vault clean outs, product recovery and transfer and vacuum services. Additional services include filtration, water treatment services and wetland restoration. Response services for environmental emergencies of any scale range from man-made disasters such as oil spills to natural disasters like hurricanes. Emergency response services also include spill cleanup on land and water, as well as contagion disinfection, decontamination and disposal services. Field and emergency response services are provided based on purchase orders or agreements with customers and include prices generally based upon daily, hourly or job rates for equipment, materials and personnel. The Company recognizes revenue for these services over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred. The duration of such services can be over a number of hours, several days or even months for larger scale projects.
Safety-Kleen環保服務—Safety-Kleen環保服務的營業收入對環保服務經營部門和SKSS經營部門均有貢獻,具體取決於這些收入的性質以及與執行收入合同相關的營運責任。提供集裝式廢物處理和處置服務、零件清洗服務和真空服務等服務的收入共同稱爲Safety-Kleen分支機構的核心服務提供,爲環保服務經營部門的營業收入做出貢獻。此外,包裝混合油產品的銷售和其他相關產品銷售也爲環保服務經營部門的營業收入做出貢獻。從廢油、防凍液和油濾收集服務、散裝混合油產品銷售以及散裝汽車流體銷售中產生的收入爲SKSS經營部門的營業收入做出貢獻。
通常,服務的收入是隨着時間的推移逐步確認,隨着客戶在服務執行過程中收到和消費服務的好處,並且公司有權利收取已完成的服務的付款。這類服務的持續時間可能長達數小時或數天。公司採用輸入法來根據已發生的時間和材料來逐步確認營業收入。產品收入是在控制權轉移時確認的,即當產品交付給客戶時控制權轉移。集裝箱廢物服務包括廢物的剖析、收集、運輸和回收利用或
8

目錄
處理各種類型的廢物。相關的收集和運輸營業收入將隨着時間逐步確認,因爲客戶在服務執行過程中接受並消費服務的好處,公司有權獲得迄今爲止已完成的業績支付。部件清洗服務包括客戶使用公司的部件清洗設備、清潔和維護部件清洗設備以及更換和回收使用過的清潔液。由於安排具有高度集成和相互依存的特性,部件清洗服務被視爲單一履約義務。部件清洗服務的收入將在服務間隔期間逐步確認,因爲客戶在服務過程中獲得服務的好處。
Safety-Kleen OilSafety-Kleen Oil相關銷售貢獻了SKSS業段的營業收入。這些收入是通過向第三方分銷商、政府機構、車隊、鐵路和工業客戶銷售高質量的基礎和混合潤滑油而產生的。該業務還向瀝青廠、工業廠和紙業股公司銷售回收的燃料油。廢油還被加工成真空氣體油,可以進一步重新精煉爲潤滑油基礎油,或直接銷售給海洋柴油燃料市場。油品的收入在時間點上確認,即在產品交付給客戶時。當產品交付給客戶時,控制權轉移。
以下表格顯示公司的第三方營業收入按營業來源和地理位置分解(單位:千美元):
2024年9月30日止三個月
環保母基服務。Safety-Kleen可持續解決方案公司總費用
主要地理市場
美國$1,166,660 $218,963 $96 $1,385,719 
加拿大120,990 22,713  143,703 
第三方總營業收入$1,287,650 $241,676 $96 $1,529,422 
營收來源
技術服務$437,180 $ $ $437,180 
工業服務和其他
345,573  96 345,669 
現場應急響應服務260,200   260,200 
安全淨化環保母基服務244,697 59,675  304,372 
安全淨化油 182,001  182,001 
第三方總營業收入$1,287,650 $241,676 $96 $1,529,422 
2023年9月30日止三個月
環保母基服務。Safety-Kleen可持續解決方案公司總費用
主要地理市場
美國$1,017,224 $206,860 $112 $1,224,196 
加拿大118,055 23,445  141,500 
第三方營業收入總額$1,135,279 $230,305 $112 $1,365,696 
營收來源
技術服務$403,889 $ $ $403,889 
工業服務及其他
350,251  112 350,363 
現場和緊急響應服務155,046   155,046 
Safety-Kleen環保母基服務226,093 59,458  285,551 
Safety-Kleen油品 170,847  170,847 
第三方營業收入總額$1,135,279 $230,305 $112 $1,365,696 
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目錄
2024年9月30日止九個月
環保母基服務。Safety-Kleen可持續解決方案公司總費用
主要地理市場
美國$3,395,446 $645,664 $297 $4,041,407 
加拿大350,781 66,648  417,429 
第三方總收入$3,746,227 $712,312 $297 $4,458,836 
營收來源
技術服務$1,288,339 $ $ $1,288,339 
工業服務和其他
1,064,441  297 1,064,738 
現場和應急響應服務676,562   676,562 
Safety-Kleen環保母基服務716,885 171,117  888,002 
Safety-Kleen石油 541,195  541,195 
第三方總收入$3,746,227 $712,312 $297 $4,458,836 
2023年9月30日止九個月
環保母基服務。Safety-Kleen可持續解決方案公司總費用
主要地理市場
美國$3,017,547 $641,625 $335 $3,659,507 
加拿大340,196 71,280  411,476 
第三方總營業收入$3,357,743 $712,905 $335 $4,070,983 
營收來源
技術服務$1,160,306 $ $ $1,160,306 
工業服務和其他1,086,175  335 1,086,510 
現場和應急響應服務457,491   457,491 
Safety-Kleen環保母基服務653,771 171,469  825,240 
Safety-Kleen石油 541,436  541,436 
第三方總營業收入$3,357,743 $712,905 $335 $4,070,983 
合同餘額
(以千爲單位)2024年9月30日2023年12月31日
應收賬款$1,100,660 $983,111 
合同資產(未開票應收款)204,308 107,859 
合同負債(遞延營業收入)103,291 95,230 

收入確認、賬單和現金收取的時間會導致合併資產負債表上出現已開單的應收賬款、未開單的應收賬款(合同資產)和客戶預付款和存款或遞延收入(合同負債)。通常,計費是在收入確認之後進行的,因爲付款權不僅受時間推移的影響,還會產生合同資產,這些資產通常被歸類爲流動資產。公司有時會在確認收入之前從客戶那裏收到預付款或存款,從而產生合同負債。這些資產和負債在每個報告期結束時按合同在合併資產負債表上報告。列報的每個期初的合同負債餘額通常在隨後的期限中得到充分確認 三個月 時期。

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目錄
(4) 業務組合
2024年收購
2024年3月22日,該公司完成了收購Hepaco Blocker,Inc.及其子公司(統稱「HEPACO」),全部現金購買價格爲$392.2 百萬美元,淨現金收購。該公司於2024年第三季度結清了本次收購的營運資本餘額,並相應調整了購買價格。 HEPACO的業務擴展了環保母基服務業務板塊的現場服務業務。
購買價格的初步分配是臨時的,基於2024年3月22日資產取得和負債承擔的公允價值的估計。公司將繼續獲取信息,完成這些餘額的估值和相關的所得稅會計。測量期調整將反映關於在收購日存在的事實和情況的新信息。 下表總結了所取得的資產和承擔的負債的初步確認和確認(以千爲單位):
根據2024年3月31日的披露,在收購日期(不應計入其他所有項目的除外)
在收購日期
如報告的
2024年9月30日
應收賬款,包括未開票款項$68,496 $1,777 $70,273 
存貨和用品1,574 (1,190)384 
預付費用和其他流動資產5,221 (681)4,540 
資產:固定資產45,453 817 46,270 
許可證和其他無形資產130,000 500 130,500 
經營租賃權使用資產9,385 — 9,385 
其他長期資產2,660 — 2,660 
應計費用及其他流動負債(43,966)(3,012)(46,978)
經營租賃負債流動部分(2,758)— (2,758)
租賃負債,除去當前部分(6,627)— (6,627)
遞延稅款負債(8,916)— (8,916)
封閉和事後責任— (1,025)(1,025)
其他長期負債(374)— (374)
可辨認淨資產合計200,148 (2,814)197,334 
商譽195,265 (420)194,845 
總購買價格$395,413 $(3,234)$392,179 
其他無形資產的收購包括客戶關係和商標/商號,預計平均使用壽命在之間。 和頁面。20 ,具有約的加權平均使用壽命。 19購買總價的超額部分(包括超過公允價值的有形和無形資產的現金對價及負債承擔)被記錄爲商譽。承認的商譽歸因於公司預計從收購中實現的運營協同效應,組裝的員工隊伍和增長潛力。從收購中產生的商譽不可用於稅務目的。
公司財務報表截至日期爲的運營活動 2024年9月30日以及按照組合基礎計算,假設該收購在2023年1月1日完成的形式財務收入和利潤金額對公司未經審計的合併財務報表不重要。
2024年3月1日,公司以全現金購買價格收購了Noble Oil Services,Inc及其子公司(統稱「Noble Oil」)爲$$68.7 美元,淨現金額。公司在2024年第二季度結算了該收購的營運資本並相應調整了購買價格。收購Noble Oil擴大了SKSS板塊在美國東南地域板塊的石油收集業務,同時還增加了被收購公司擁有和經營的再生油廠的增量生產。
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目錄
購價分配預計暫時,並基於對於於2024年3月1日資產和負債的公允價值的預估。公司仍在獲取信息以完成這些餘額的估價和相關的所得稅會計。計量期調整將反映在收購日期存在的事實和情形方面獲得的新信息。 以下表格總結了獲取資產和承擔負債的初步確定和確認(以千計)。
根據2024年3月31日報道的收購日(不應計入其他所有項目的除外)
收購日
如報告的
2024年9月30日
應收賬款,包括未開票款項5,693 158 5,851 
存貨和用品6,817 (219)6,598 
預付費用和其他流動資產423 (16)407 
資產:固定資產38,914 8,782 47,696 
許可證和其他無形資產20,200 (5,700)14,500 
經營租賃權使用資產3,615 — 3,615 
其他長期資產92 — 92 
應計費用及其他流動負債(8,990)97 (8,893)
經營租賃負債流動部分(1,823)— (1,823)
租賃負債,除去當前部分(1,792)— (1,792)
關閉和發帖後責任— (820)(820)
可辨認淨資產合計63,149 2,282 65,431 
商譽5,744 (2,433)3,311 
總購買價格$68,893 $(151)$68,742 
其他無形資產包括客戶關係和商標/商號,預計使用壽命爲 和頁面。15 年,加權平均使用壽命約爲 13。超出購買總價的部分(包括超過有形和無形資產的公允價值和負債承擔的總現金對價)被記錄爲商譽。確認的商譽可歸因於公司預計從收購中實現的經營協同效應和組裝工作人員。從收購中產生的商譽可用於稅收目的。
公司財務報表截至日期爲的運營活動 2024年9月30日以及按照組合基礎計算,假設該收購在2023年1月1日完成的形式財務收入和利潤金額對公司未經審計的合併財務報表不重要。
2023年的收購計劃
2023年3月31日,公司以全現金購買價格$億收購了Thompson Industrial Services, LLC(「Thompson Industrial」)。110.9 Thompson Industrial的運營擴大了環保母基服務板塊在美國東南地區的工業服務業務。
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The Company finalized the purchase accounting for this acquisition in the first quarter of 2024. The allocation of the purchase price was based on estimates of the fair value and assets acquired and liabilities assumed as of March 31, 2023. The following table summarizes the final determination and recognition of assets acquired and liabilities assumed (in thousands):
At Acquisition Date As Reported December 31, 2023
Measurement Period Adjustments
Final Allocation
As Reported
September 30, 2024
Accounts receivable, including unbilled receivables$25,233 $(73)$25,160 
Inventories and supplies228 — 228 
Prepaid expenses and other current assets1,302 — 1,302 
Property, plant and equipment26,719 — 26,719 
Permits and other intangibles28,900 — 28,900 
Operating lease right-of-use assets4,716 — 4,716 
Other long-term assets72 — 72 
Accrued expenses and other current liabilities(10,385)(145)(10,530)
Current portion of operating lease liabilities(1,653)— (1,653)
Operating lease liabilities, less current portion(3,063)— (3,063)
Other long-term liabilities(560)— (560)
Total identifiable net assets71,509 (218)71,291 
Goodwill39,346 218 39,564 
Total purchase price$110,855 $ $110,855 
Permits and other intangible assets acquired include customer relationships, trademarks/tradenames and non-compete agreements and are anticipated to have estimated useful lives of between five and 15 years with a weighted average useful life of approximately 13 years. The excess of the total purchase price, which includes the aggregate cash consideration paid in excess of the fair value of the tangible and intangible assets acquired and liabilities assumed, was recorded as goodwill. The goodwill recognized is attributable to the operating synergies, assembled workforce and growth potential that the Company expects to realize from the acquisition. Goodwill generated from the acquisition is deductible for tax purposes.

(5) INVENTORIES AND SUPPLIES
Inventories and supplies consisted of the following (in thousands):
September 30, 2024December 31, 2023
Supplies$195,973 $177,217 
Oil and oil related products149,814 118,600 
Solvent and solutions12,788 11,795 
Other17,989 19,899 
Total inventories and supplies$376,564 $327,511 
Supplies inventories consist primarily of critical spare parts to support the Company’s incinerator and re-refinery operations and other general supplies used in our normal day-to-day operations. Other inventories consist primarily of parts washer components, cleaning fluids, absorbents and automotive fluids, such as windshield washer fluid and antifreeze.

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(6) PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consisted of the following (in thousands):
September 30, 2024December 31, 2023
Land$186,984 $174,891 
Asset retirement costs (non-landfill)28,935 27,167 
Landfill assets259,233 253,180 
Buildings and improvements (1)
649,401 630,525 
Vehicles (2)
1,430,325 1,276,567 
Equipment (3)
2,453,616 2,388,370 
Construction in progress316,666 213,601 
5,325,160 4,964,301 
Less - accumulated depreciation and amortization2,872,848 2,770,983 
Total property, plant and equipment, net$2,452,312 $2,193,318 
________________
(1) Balances inclusive of gross right-of-use (“ROU”) assets classified as finance leases of $8.0 million in both periods.
(2) Balances inclusive of gross ROU assets classified as finance leases of $208.7 million and $151.7 million, respectively.
(3) Balances inclusive of gross ROU assets classified as finance leases of $9.3 million and $9.2 million, respectively.
Depreciation expense, inclusive of landfill and finance lease amortization, was $86.2 million and $254.9 million for the three and nine months ended September 30, 2024, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $80.4 million and $229.7 million for the three and nine months ended September 30, 2023, respectively. The Company recorded $3.3 million and $8.6 million of capitalized interest during the three and nine months ended September 30, 2024, respectively. The Company recorded $1.7 million and $4.4 million of capitalized interest during the three and nine months ended September 30, 2023, respectively. Capitalized interest in the periods presented is primarily attributable to the construction of a new incinerator in Kimball, Nebraska.

(7) GOODWILL AND OTHER INTANGIBLE ASSETS
The changes in goodwill by segment for the nine months ended September 30, 2024 were as follows (in thousands):
Environmental ServicesSafety-Kleen Sustainability SolutionsTotals
Balance at January 1, 2024$1,112,013 $175,723 $1,287,736 
Increase from current period acquisitions194,845 3,311 198,156 
Measurement period adjustments from prior period acquisitions218  218 
Foreign currency translation(745)(300)(1,045)
Balance at September 30, 2024$1,306,331 $178,734 $1,485,065 
The Company assesses goodwill on an annual basis as of December 31 or at an interim date when events or changes in the business environment (“triggering events”) would more likely than not reduce the fair value of a reporting unit below its carrying value. During the period ended September 30, 2024, no such triggering events were identified.
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As of September 30, 2024 and December 31, 2023, the Company’s intangible assets consisted of the following (in thousands):
September 30, 2024December 31, 2023
CostAccumulated
Amortization
NetCostAccumulated
Amortization
Net
Permits$193,201 $123,335 $69,866 $191,747 $117,556 $74,191 
Customer and supplier relationships
697,295 249,215 448,080 604,994 258,879 346,115 
Other intangible assets
114,112 43,210 70,902 100,068 37,862 62,206 
Total amortizable permits and other intangible assets
1,004,608 415,760 588,848 896,809 414,297 482,512 
Trademarks and trade names
120,087 — 120,087 120,285 — 120,285 
Total permits and other intangible assets
$1,124,695 $415,760 $708,935 $1,017,094 $414,297 $602,797 
Amortization expense of permits, customer and supplier relationships and other intangible assets was $13.9 million and $40.7 million in the three and nine months ended September 30, 2024, respectively. Amortization expense of permits, customer and supplier relationships and other intangible assets was $12.5 million and $37.8 million in the three and nine months ended September 30, 2023, respectively.
The expected amortization of the net carrying amount of finite-lived intangible assets at September 30, 2024 was as follows (in thousands):
Years Ending December 31,Expected Amortization
2024 (three months)$13,608 
202557,103 
202650,813 
202748,308 
202846,836 
Thereafter372,180 
$588,848 

(8) ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES
Accrued expenses and other current liabilities consisted of the following (in thousands):
September 30, 2024December 31, 2023
Accrued compensation and benefits$117,526 $113,236 
Accrued insurance106,906 107,658 
Accrued income, real estate, sales and other taxes60,547 44,752 
Accrued interest14,799 33,857 
Accrued other98,458 97,654 
$398,236 $397,157 

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(9) CLOSURE AND POST-CLOSURE LIABILITIES
The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2024 through September 30, 2024 were as follows (in thousands):
Landfill
Retirement
Liability
Non-Landfill
Retirement
Liability
Total
Balance at January 1, 2024$59,443 $59,157 $118,600 
Liabilities assumed in acquisitions 1,845 1,845 
New asset retirement obligations4,093  4,093 
Accretion3,915 3,305 7,220 
Changes in estimates recorded to consolidated statement of operations(134)(120)(254)
Changes in estimates recorded to consolidated balance sheet46 39 85 
Expenditures(8,728)(3,128)(11,856)
Currency translation and other(81)(74)(155)
Balance at September 30, 2024$58,554 $61,024 $119,578 
In the nine months ended September 30, 2024, there were no significant benefits or charges resulting from changes in estimates for closure and post-closure liabilities.

(10) REMEDIAL LIABILITIES 
The changes to remedial liabilities from January 1, 2024 through September 30, 2024 were as follows (in thousands):
Remedial
Liabilities for
Landfill Sites
Remedial
Liabilities for
Inactive Sites
Remedial
Liabilities
(Including
Superfund) for
Non-Landfill
Operations
Total
Balance at January 1, 2024$1,880 $60,277 $49,086 $111,243 
Accretion69 1,719 1,131 2,919 
Changes in estimates recorded to consolidated statement of operations24 614 3,963 4,601 
Expenditures(40)(2,944)(4,839)(7,823)
Currency translation and other (11)(271)(282)
Balance at September 30, 2024$1,933 $59,655 $49,070 $110,658 
In the nine months ended September 30, 2024, changes in estimates for remedial liabilities included a $2.9 million reserve increase related to new information on the ultimate remediation of an existing Superfund site.

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(11) FINANCING ARRANGEMENTS
Long-Term Debt
The following table is a summary of the Company’s long-term debt (in thousands):
Current Portion of Long-Term Debt:September 30, 2024December 31, 2023
Secured senior term loans$15,102 $10,000 
Long-Term Debt:
Secured senior term loans due October 8, 20281,453,571 970,000 
Unsecured senior notes, at 4.875%, due July 15, 2027 (“2027 Notes”)
545,000 545,000 
Unsecured senior notes, at 5.125%, due July 15, 2029 (“2029 Notes”)
300,000 300,000 
Unsecured senior notes, at 6.375%, due February 1, 2031 (“2031 Notes”)
500,000 500,000 
Long-term debt, at par$2,798,571 $2,315,000 
Unamortized debt issuance costs and discount(24,912)(23,283)
Long-term debt, at carrying value$2,773,659 $2,291,717 
Financing Activities
The Company’s significant financing arrangements are described in Note 12, “Financing Arrangements,” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023 and, other than as noted below, there have been no material changes to the arrangements described therein.
On June 28, 2024, the Company and one of the Company’s Canadian subsidiaries (the “Canadian Borrower”) entered into a seventh amended and restated credit agreement (the “Amended Credit Agreement”) with Bank of America, N.A., as administrative agent, and the lenders party to the Amended Credit Agreement. The Amended Credit Agreement amended and restated the sixth amended and restated credit agreement dated October 28, 2020 (the “Prior Credit Agreement”).
Under the Amended Credit Agreement, the Company has the right to obtain revolving loans and letters of credit for a combined maximum of up to $550.0 million (with a sub-limit of $250.0 million for letters of credit) and the Canadian Borrower has the right to obtain revolving loans and letters of credit for a combined maximum of up to $50.0 million. The maximum borrowing amount of $600.0 million under the Amended Credit Agreement is increased from $400.0 million under the Prior Credit Agreement.
Borrowings by the Company under the Amended Credit Agreement will bear interest at the Company’s option, at either (i) the sum of Term SOFR plus a SOFR Adjustment of 0.1% plus 1.5% per annum, or (ii) the U.S. Base Rate, plus 0.5% per annum, and borrowings by the Canadian Borrower will bear interest, at the Company’s option, at either (i) the sum of Term CORRA plus a Term CORRA adjustment of either 0.29547% or 0.32138% for the one or three month interest period respectively, plus 1.5% per annum, (ii) the Canadian Prime Rate, plus 0.5% per annum, or (iii) the Canadian Base Rate, plus 0.5% per annum, as those terms are defined in the Amended Credit Agreement. Other terms under the Amended Credit Agreement are substantially the same as under the Prior Credit Agreement. Subject to certain customary conditions, the facility will expire on June 28, 2029.
The Company had no outstanding loan balance under the Amended Credit Agreement as of the date of the amendment discussed above, September 30, 2024 or December 31, 2023. As of September 30, 2024, the Company had $469.8 million available to borrow under the revolving credit facility and outstanding letters of credit were $130.2 million.
On March 22, 2024, the Company and substantially all of the Company’s domestic subsidiaries entered into Incremental Facility Amendment No. 5 to the Company’s existing Credit Agreement, dated as of June 30, 2017 (“Term Loan Agreement”). Incremental Facility Amendment No. 5 provided for the incurrence of additional term loans (the “2024 Incremental Term Loans”) under the Term Loan Agreement in the aggregate principal amount of $500.0 million. Proceeds from the issuance of the 2024 Incremental Term Loans were $491.1 million after debt discount and debt issuance costs, and were used to fund the acquisition of HEPACO, with the excess increasing the Company’s cash balances. The 2024 Incremental Term Loans are in addition to the aggregate of $980.0 million of term loans (the “Existing Term Loans”) which were outstanding prior to the issuance of the 2024 Incremental Term Loans. Both the 2024 Incremental Term Loans and the Existing Term Loans (collectively referred to as the “2028 Term Loans”) will mature on October 8, 2028, and may be prepaid at any time without premium or penalty other than customary breakage costs. The Company’s obligations under the 2028 Term Loans are guaranteed by substantially all of the Company’s domestic restricted subsidiaries and secured by liens on substantially all of the assets of the Company and the guarantors.
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The 2028 Term Loans bear interest, at the Company’s election, at either of the following rates: (a) the sum of the Term SOFR Rate (as defined in the Term Loan Agreement) plus 0.11448% (the one-month Term SOFR adjustment) plus a 1.75% margin per annum, or (b) the sum of the Base Rate (as defined in the Term Loan Agreement) plus 0.75% margin per annum. The Term SOFR rate is subject to a floor of 0.00% and the Base Rate is subject to a floor of 1.00%. The Company has elected one-month Term SOFR for interest payments on that debt; however, the Term Loan Agreement provides for Term SOFR adjustments for other interest periods. Interest on the 2028 Term Loans is paid monthly with interest payments on the 2024 Incremental Term Loan portion having commenced in April 2024.
As of September 30, 2024 and December 31, 2023, the estimated fair value of the Company’s outstanding long-term debt, including the current portion, was $2.8 billion and $2.3 billion, respectively. The Company’s estimates of fair value of its long-term debt, including the current portion, are based on quoted market prices or other available market data which are considered Level 2 measures according to the fair value hierarchy. Level 2 utilizes quoted market prices in markets that are not active, broker or dealer quotation or alternative pricing sources with reasonable levels of price transparency for similar assets and liabilities.
As of September 30, 2024, after taking into account the interest rate swaps discussed under the “Cash Flow Hedges” heading below, the Company’s variable rate debt consisted of $868.7 million of the 2028 Term Loans. The Company’s interest rate on this variable rate debt as of September 30, 2024 was 7.06%.
On October 8, 2024, the Company and substantially all of the Company’s domestic subsidiaries entered into Amendment No. 6 (the “Sixth Amendment”) to the Term Loan Agreement. The Sixth Amendment (i) eliminated the Term SOFR Adjustment (noted above as 0.11448% per annum) and (ii) resets the six month soft call period for a repricing of the 2028 Term Loans. After giving effect to the repricing, the applicable interest rate margins for the 2028 Term Loans are 1.75% for Term SOFR borrowings and 0.75% for base rate borrowings. Under the Sixth Amendment the 2028 Term Loans may be prepaid at any time without premium or penalty other than customary breakage costs or if the Company engages in certain repricing transactions before April 8, 2025, in which event a 1% prepayment premium would be due.
Cash Flow Hedges        
The Company’s strategy to hedge against fluctuations in variable interest rates involves entering into interest rate derivative agreements.
The Company has entered into interest rate swap agreements with a notional amount of $600.0 million (“2022 Swaps”) to effectively fix the interest rate on $600.0 million principal of the outstanding existing Term Loans. The fixed rate on these instruments is 1.9645% and the variable rate is linked to the Term SOFR to mirror the variable interest payments for the Term Loans. For the nine months ended September 30, 2024, including the 1.75% interest rate margin and the 0.11448% SOFR adjustment for the Term Loans, the effective annual interest rate of this $600.0 million of principal debt was approximately 3.83%. Following the Sixth Amendment, which eliminated the 0.11448% SOFR adjustment, the effective annual rate on the $600.0 million of principal is approximately 3.71%.
Prior to the phase-out of LIBOR as a referenced rate on June 30, 2023, the fixed rate on the 2022 Swaps was 0.931% and the variable rate was linked to LIBOR, to mirror the LIBOR linked variable interest payments for the existing Term Loans. With the then 2.00% interest rate margin for the existing Term Loans, the effective annual interest rate of the $600.0 million of principal debt was 2.931% through June 30, 2023. The 2022 Swaps will expire on September 30, 2027.
At the inception of these instruments, the Company designated the 2022 Swaps as cash flow hedges. As of September 30, 2024, the Company recorded a derivative asset with a fair value of $23.3 million related to the 2022 Swaps. The balance of the derivative asset as of December 31, 2023 was $35.5 million. These assets are included in Other long-term assets on the consolidated balance sheets.
No ineffectiveness has been identified on the 2022 Swaps and, therefore the change in fair value is recorded in stockholders’ equity as a component of accumulated other comprehensive loss. Amounts are reclassified from accumulated other comprehensive loss into interest expense on the unaudited consolidated statement of operations in the same period or periods during which the hedged transactions affect earnings.

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(12) EARNINGS PER SHARE     
The computation of basic earnings per share (EPS) is based on the weighted-average number of common shares outstanding. The computation of diluted EPS is based on the weighted-average number of common shares outstanding and potential dilutive common shares during the period as determined by using the treasury stock method.
The following are computations of basic and diluted earnings per share (in thousands, except per share amounts):
Three Months EndedNine Months Ended
 September 30,September 30,
 2024202320242023
Numerator for basic and diluted earnings per share:
Net income$115,213 $91,340 $318,325 $279,507 
Denominator:
Weighted-average shares outstanding, basic53,951 54,122 53,936 54,097 
Dilutive impact of equity awards278 297 293 314 
Weighted-average shares outstanding, diluted
54,229 54,419 54,229 54,411 
Basic earnings per share:$2.14 $1.69 $5.90 $5.17 
Diluted earnings per share:$2.12 $1.68 $5.87 $5.14 
Potentially dilutive shares outstanding include the dilutive effect of unvested restricted stock awards and employee stock purchase plan (“ESPP”) rights (collectively referred to as “equity awards”). Potentially dilutive shares whose effect would have been antidilutive are excluded from the computation of diluted earnings per share. The Company included all outstanding performance awards, restricted stock awards and ESPP rights in the calculation of diluted earnings per share except as shown in the table below (in thousands):
 Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Antidilutive restricted stock awards5 7 6 14 
Performance stock awards for which performance criteria was not attained at reporting date160 103 160 103 

(13) ACCUMULATED OTHER COMPREHENSIVE LOSS
The changes in accumulated other comprehensive loss by component and related tax impacts for the nine months ended September 30, 2024 were as follows (in thousands):
Foreign Currency Translation
Adjustments
Unrealized (Loss) Gain on Available-For-Sale Securities
Unrealized Gain on Fair Value of Interest Rate HedgesUnrealized Loss on PensionTotal
Balance at January 1, 2024$(200,339)$(4)$25,891 $(887)$(175,339)
Other comprehensive (loss) income before reclassifications(8,031)215 3,296 18 (4,502)
Amounts reclassified out of accumulated other comprehensive loss  (15,424) (15,424)
Tax (provision) benefit (45)3,274  3,229 
Other comprehensive (loss) income(8,031)170 (8,854)18 (16,697)
Balance at September 30, 2024$(208,370)$166 $17,037 $(869)$(192,036)
The amount realized in the unaudited consolidated statement of operations during the three and nine months ended September 30, 2024 which was reclassified out of accumulated other comprehensive loss was as follows (in thousands):
Component of Accumulated Other Comprehensive LossThree Months Ended September 30, 2024Nine Months Ended September 30, 2024Location
Unrealized Gain on Fair Value of Interest Rate Hedges$5,213 $15,424 Interest expense, net of interest income
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(14) STOCK-BASED COMPENSATION
Total stock-based compensation cost recognized for the three and nine months ended September 30, 2024 was $5.8 million and $20.7 million, respectively. Total stock-based compensation cost recognized for the three and nine months ended September 30, 2023 was $4.3 million and $14.8 million, respectively. The total income tax benefit recognized in the unaudited consolidated statements of operations from stock-based compensation expense for the three and nine months ended September 30, 2024 was $1.0 million and $3.7 million, respectively. The total income tax benefit recognized in the unaudited consolidated statements of operations from stock-based compensation expense for the three and nine months ended September 30, 2023 was $0.7 million and $2.4 million, respectively.
Restricted Stock Awards
The following table summarizes information about restricted stock awards for the nine months ended September 30, 2024:
Restricted StockNumber of SharesWeighted Average
Grant-Date
Fair Value
Balance at January 1, 2024414,623 $114.02 
Granted144,341 187.87 
Vested(130,495)102.40 
Forfeited(21,578)143.28 
Balance at September 30, 2024406,891 $142.39 
As of September 30, 2024, there was $43.8 million of total unrecognized compensation cost arising from restricted stock awards. This cost is expected to be recognized over a weighted average period of 2.9 years. The total fair value of restricted stock vested during the three and nine months ended September 30, 2024 was $16.3 million and $27.2 million, respectively. The total fair value of restricted stock vested during the three and nine months ended September 30, 2023 was $16.6 million and $24.6 million, respectively.
Performance Stock Awards
Performance stock awards are subject to performance criteria established by the Compensation and Human Capital Committee of the Company’s Board of Directors prior to or at the date of grant. The performance stock awards are earned based on achieving certain revenue, Adjusted EBITDA Margin, Return on Invested Capital and Total Recordable Incident Rate targets set forth in the applicable award agreements. Performance stock awards include continued service conditions through vesting.
The following table summarizes information about performance stock awards for the nine months ended September 30, 2024:
Performance StockNumber of SharesWeighted Average
Grant-Date
Fair Value
Balance at January 1, 2024181,284 $114.10 
Granted79,738 173.45 
Vested(29,358)100.63 
Forfeited(4,800)148.48 
Balance at September 30, 2024226,864 $135.98 
As of September 30, 2024, there was $6.8 million of total unrecognized compensation cost arising from performance stock awards achieved or deemed probable of vesting. The total fair value of performance awards vested during the three and nine months ended September 30, 2024 was $2.6 million and $6.3 million. The total fair value of performance awards vested during the three and nine months ended September 30, 2023 was $1.7 million and $9.6 million, respectively.

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Employee Stock Purchase Plan
On May 22, 2024, the Company’s shareholders approved the Clean Harbors Employee Stock Purchase Plan (the “ESPP”). The ESPP provides a means for eligible employees of the Company to authorize after-tax payroll deductions on a voluntary basis to be used for the periodic purchase of the Company's common stock at a 10% discount to its fair market value. The purchase price paid by the employees will be 90% of the lower of the closing price of the Company's common stock on (i) the first trading day of the offering period or (ii) the last trading day of the offering period. A total of 500,000 shares of common stock are reserved for issuance under the ESPP. As of September 30, 2024, no shares have been issued under the plan.

(15) COMMITMENTS AND CONTINGENCIES
The Company and its subsidiaries are subject to legal proceedings and claims arising in the ordinary course of business. Actions filed against the Company arise from commercial and employment-related claims including alleged class actions related to sales practices and wage and hour claims. The plaintiffs in these actions may be seeking damages or injunctive relief or both. These actions are in various jurisdictions and stages of proceedings, and some are covered in part by insurance. In addition, the Company’s waste management services operations are regulated by federal, state, provincial and local laws enacted to regulate discharge of materials into the environment, remediation of contaminated soil and groundwater or otherwise protect the environment. This ongoing regulation results in the Company frequently becoming a party to legal or administrative proceedings involving all levels of government authorities and other interested parties. The issues involved in such proceedings generally relate to alleged violations of existing permits and licenses or alleged responsibility under federal or state Superfund laws to remediate contamination at properties owned either by the Company or by other parties (“third-party sites”) to which either the Company or the prior owners of certain of the Company’s facilities shipped waste.
At September 30, 2024 and December 31, 2023, the Company had recorded reserves of $32.7 million and $32.4 million, respectively, for actual or probable liabilities related to the legal and administrative proceedings in which the Company was then involved, the principal of which are described below. As of September 30, 2024 and December 31, 2023, the $32.7 million and $32.4 million, respectively, of reserves consisted of (i) $26.1 million and $25.0 million, respectively, related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets, and (ii) $6.6 million and $7.4 million, respectively, primarily related to federal, state and provincial enforcement actions, which were included in accrued expenses on the consolidated balance sheets.
In management’s opinion, it is not reasonably possible that the potential liability beyond what has been recorded, if any, that may result from these actions, either individually or collectively, will have a material effect on the Company’s financial position, results of operations or cash flows. The Company periodically adjusts the aggregate amount of these reserves when actual or probable liabilities are paid or otherwise discharged, new claims arise, or additional relevant information about existing or probable claims becomes available.
Legal or Administrative Proceedings
As of September 30, 2024, the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2024, relate to Safety-Kleen product liability cases and Superfund proceedings.
Safety-Kleen Product Liability Cases: Safety-Kleen, Inc. (“Safety-Kleen”), which is a legal entity acquired by the Company in 2012, has been named as a defendant in certain product liability cases that are currently pending in various courts and jurisdictions throughout the United States. As of September 30, 2024, there were approximately 71 proceedings (excluding cases which have been settled but not formally dismissed) wherein persons claim personal injury resulting from the use of Safety-Kleen’s parts cleaning equipment or cleaning products. These proceedings typically involve allegations that the solvent used in Safety-Kleen’s parts cleaning equipment contains contaminants and/or that Safety-Kleen’s recycling process does not effectively remove the contaminants that become entrained in the solvent during their use. In addition, certain claimants assert that Safety-Kleen failed to warn adequately the product user of potential risks, including a historic failure to warn that solvent contains trace amounts of toxic or hazardous substances such as benzene.
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The Company maintains insurance that it believes will provide coverage for these product liability claims (over amounts accrued for self-insured retentions and deductibles in certain limited cases), except for punitive damages to the extent not insurable under state law or excluded from insurance coverage. The Company historically has vigorously defended, and intends to continue to vigorously defend, itself and the safety of its products against all of these claims. Such matters are subject to many uncertainties and outcomes are not predictable with assurance. Consequently, the Company is unable to ascertain the ultimate aggregate amount of monetary liability or financial impact with respect to these matters as of September 30, 2024. From January 1, 2024 to September 30, 2024, 14 product liability claims were settled or dismissed. Due to the nature of these claims and the related insurance, the Company did not incur any expense as insurance provided coverage in full for all such claims. Safety-Kleen may be named in similar, additional lawsuits in the future, including claims for which insurance coverage may not be available.
Superfund Proceedings: The Company has been notified that either the Company or the prior owners of certain facilities the Company has since acquired have been identified as potentially responsible parties (“PRPs”) or potential PRPs of indemnification obligations in connection with 131 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 131 Superfund related sites, six involve facilities that are now owned or leased by the Company and 125 involve third-party sites which received waste potentially shipped by the Company or the prior owners of certain facilities the Company has since acquired. Of the 125 third-party sites, 30 are now settled, 13 are currently requiring expenditures on remediation and 82 are not currently requiring expenditures on remediation.
In connection with each site, the Company has estimated the extent, if any, to which it may be subject, either directly or as a result of any indemnification obligations, for cleanup and remediation costs, related legal and consulting costs associated with PRP investigations, settlements and related legal and administrative proceedings. The amount of such actual and potential liability is inherently difficult to estimate because of, among other relevant factors, uncertainties as to the legal liability (if any) of the Company or the prior owners of certain of the Company’s facilities to contribute a portion of the cleanup costs, the assumptions that must be made in calculating the estimated cost and timing of remediation, the identification of other PRPs and their respective capability and obligation to contribute to remediation efforts and the existence and legal standing of indemnification agreements (if any) with prior owners, which may either benefit the Company or subject the Company to potential indemnification obligations. The Company believes its potential monetary liability could exceed $1.0 million at three of the 131 Superfund related sites.
Of the 125 third-party sites at which the Company has been notified it is a PRP or potential PRP or may have indemnification obligations, the Company has indemnification agreements at a total of 17 sites. These agreements indemnify the Company with respect to any liability at the 17 sites for waste disposed prior to the Company’s acquisition of the former subsidiaries of Waste Management, Inc. and McKesson Corporation which had shipped waste to those sites. Accordingly, the indemnifying parties are paying all costs of defending those subsidiaries in those 17 cases, including legal fees and settlement costs. However, there can be no guarantee that the Company’s ultimate liabilities for those sites will not exceed the amount recorded or that indemnities applicable to any of these sites will be available to pay all or a portion of related costs. Except for those indemnification agreements discussed, the Company does not have an indemnity agreement with respect to any of the 125 third-party sites discussed above.
Federal, State and Provincial Enforcement Actions
From time to time, the Company pays fines or penalties in regulatory proceedings relating primarily to waste treatment, storage or disposal facilities. As of September 30, 2024, there was one proceeding for which the Company believed it was possible that the sanctions could equal or exceed $1.0 million. As of December 31, 2023, there were no proceedings for which the Company believed it was possible that the sanctions could equal or exceed $1.0 million. As of the date of these financial statements, the Company believes that the fines or other penalties in this or any of the other regulatory proceedings will, individually or in the aggregate, not have a material effect on its financial condition, results of operations or cash flows.

(16) SEGMENT REPORTING 
Segment reporting is prepared on the same basis that the Company’s chief operating decision maker (“CODM”), which is a committee comprised of the Company’s Co-Chief Executive Officers, manages the business, makes operating decisions and assesses performance. The Company is managed and reports as two operating segments; (i) the Environmental Services segment and (ii) the Safety-Kleen Sustainability Solutions segment.
Third-party revenue is revenue billed to outside customers by a particular segment. Direct revenue is revenue allocated to the segment providing the product or service. Intersegment revenues represent the sharing of third-party revenues among the segments based on products and services provided by each segment as if the products and services were sold directly to the third-party. The intersegment revenues are shown net. The operations not managed through the Company’s operating segments described above are recorded as “Corporate Items.”
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The following tables reconcile third-party revenues to direct revenues for the three and nine months ended September 30, 2024 and 2023 (in thousands):
Three Months EndedThree Months Ended
September 30, 2024September 30, 2023
Third-Party RevenuesIntersegment Revenues (Expenses), netDirect RevenuesThird-Party RevenuesIntersegment Revenues (Expenses), netDirect Revenues
Environmental Services$1,287,650 $9,537 $1,297,187 $1,135,279 $11,084 $1,146,363 
Safety-Kleen Sustainability Solutions241,676 (9,537)232,139 230,305 (11,084)219,221 
Corporate Items96 — 96 112 — 112 
Total$1,529,422 $— $1,529,422 $1,365,696 $— $1,365,696 
Nine Months EndedNine Months Ended
September 30, 2024September 30, 2023
Third-Party RevenuesIntersegment Revenues (Expenses), netDirect RevenuesThird-Party RevenuesIntersegment Revenues (Expenses), netDirect Revenues
Environmental Services$3,746,227 $32,853 $3,779,080 $3,357,743 $31,397 $3,389,140 
Safety-Kleen Sustainability Solutions712,312 (32,853)679,459 712,905 (31,397)681,508 
Corporate Items297 — 297 335 — 335 
Total$4,458,836 $— $4,458,836 $4,070,983 $— $4,070,983 
The primary financial measure by which the Company evaluates the performance of its segments is Adjusted EBITDA, which consists of net income plus accretion of environmental liabilities, stock-based compensation, depreciation and amortization, net interest expense, loss on early extinguishment of debt and provision for income taxes and excludes other gains, losses and non-cash charges not deemed representative of fundamental segment results and other expense (income), net. Transactions between the segments are accounted for at the Company’s best estimate based on similar transactions with outside customers.
The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):
 Three Months EndedNine Months Ended
September 30,September 30,
 2024202320242023
Adjusted EBITDA:  
Environmental Services$332,502 $288,982 $956,892 $822,949 
Safety-Kleen Sustainability Solutions41,226 31,146 122,402 126,024 
Corporate Items(71,914)(65,111)(219,569)(191,312)
Total301,814 255,017 859,725 757,661 
Reconciliation to Consolidated Statements of Operations:  
Accretion of environmental liabilities3,618 3,388 10,139 10,281 
Stock-based compensation5,837 4,291 20,690 14,809 
Depreciation and amortization100,063 92,970 295,632 267,425 
Income from operations192,296 154,368 533,264 465,146 
Other expense (income), net1,123 (334)2,431 833 
Loss on early extinguishment of debt
   2,362 
Interest expense, net of interest income35,779 29,696 100,767 80,400 
Income before provision for income taxes$155,394 $125,006 $430,066 $381,551 

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ITEM 2.    MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS 
Forward-Looking Statements 
In addition to historical information, this Quarterly Report on Form 10-Q contains forward-looking statements, which are generally identifiable by use of the words “believes,” “expects,” “intends,” “anticipates,” “plans to,” “seeks,” “should,” “estimates,” “projects,” “may,” “likely,” “potential” or similar expressions. Such statements may include, but are not limited to, statements about the Company’s future financial and operating results, plans, strategy, objectives and goals, cost management initiatives, contingent liabilities, liquidity, business and market conditions, customer demand, acquisitions, growth opportunities, expectations and other statements that are not historical facts. Such statements are based upon the beliefs and expectations of Clean Harbors’ management as of the date of this report only and are subject to certain risks and uncertainties that could cause actual results to differ materially, including, without limitation, risks and uncertainties and those items identified as “Risk Factors” in our Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on February 21, 2024, and in other documents we file from time to time with the SEC. Forward-looking statements are neither historical facts nor assurances of future performance. Therefore, readers are cautioned not to place undue reliance on these forward-looking statements, which reflect management’s opinions only as of the date hereof. Our actual results and financial condition may differ materially from those indicated in the forward-looking statements. We undertake no obligation to revise or publicly release the results of any revision to these forward-looking statements.
Overview
We are North America’s leading provider of environmental and industrial services, supporting our customers in finding environmentally responsible solutions to further their sustainability goals in today’s world. Everywhere industry meets the environment, we strive to provide eco-friendly products and services that protect and restore North America’s natural environment. We believe we operate, in the aggregate, the largest number of hazardous waste incinerators, landfills and treatment, storage and disposal facilities (“TSDFs”) in North America. We serve over 300,000 customers, including the majority of Fortune 500 companies, across various markets including chemical and manufacturing, as well as numerous government agencies. These customers rely on us to safely deliver a broad range of services including but not limited to end-to-end hazardous waste management, emergency response, industrial cleaning and maintenance and recycling services. We are also a leading provider of parts cleaning and related environmental services to general manufacturing, automotive and commercial customers in North America and the largest re-refiner and recycler of used oil in North America, offering a unique closed-loop re-refining process that helps customers achieve their sustainability goals.
Performance of our segments is evaluated on several factors of which the primary financial measure is Adjusted EBITDA, which is reconciled to our net income and described more fully below. The following is a discussion of how management evaluates its segments using other factors, including key performance indicators that management uses to assess the segments’ results, as well as certain macroeconomic trends and influences that impact each reportable segment:
Environmental Services - Environmental Services segment results are predicated upon the demand by our customers for our wide variety of services, waste volumes managed by delivering such services and project work for which responsible waste handling and/or disposal is required. Environmental Services results are also impacted by the demand for planned and unplanned industrial related cleaning and maintenance services at customer sites, environmental cleanup services on a scheduled or emergency basis, including response to large scale events such as major chemical spills, natural disasters, or other instances where immediate and specialized services are required. The Environmental Services segment results include the Safety-Kleen branches’ core environmental service offerings of containerized waste disposal, parts washer and vacuum services. These results are driven by the volumes of waste collected from these customers, the overall number of parts washers placed at customer sites and the demand for and frequency of other offered services. The results and integration of the acquired operations of HEPACO Blocker, Inc. and its subsidiaries (collectively “HEPACO”) also impact the overall segment results. In managing the business and evaluating performance, management tracks the volumes and mix of waste handled and disposed of or recycled, generally through our incinerators, TSDFs and landfills, the utilization rates of our incinerators, equipment and workforce, including billable hours and the number of parts washer services performed, and pricing realized by our business and peer companies as well as other key metrics. Levels of activity and ultimate performance associated with this segment can be impacted by several factors including overall North American GDP, U.S. industrial production, economic conditions in the general manufacturing, chemical and automotive markets, including efforts and economic incentives to increase domestic operations, available capacity at waste disposal outlets, weather conditions, efficiency of our operations, technology, changing regulations, competition, market pricing of our services, costs incurred to deliver our services and the management of our related operating costs.
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Safety-Kleen Sustainability Solutions - Safety-Kleen Sustainability Solutions (“SKSS”) offers high quality, environmentally responsible recycled base and blended oil products and other automotive and industrial lubricants to fleet customers, distributors, manufacturers of oil products and industrial plants. Segment results are impacted by market pricing, overall market demand and mix of our oil products sales, with management’s objective being to limit exposure to commodity market pricing risk through increased production of value added blended lubricants and contracted rate supply agreements with customers. Segment results are also predicated on the demand for other SKSS product and service offerings including collection services for used oil, used oil filters and other automotive fluids. The used oil collected is used as feedstock in our oil re-refining to produce our base and blended oil products and other hydraulic oils, lubricants and recycled fuel oil or are integrated into our recycling and disposal network. The results and integration of the acquired operations of Noble Oil Services, Inc. and its subsidiaries (collectively “Noble”) also impact the overall segment results. In operating the business and evaluating performance, management tracks the volumes and relative percentages of base and blended oil sales along with various pricing metrics associated with the commodity driven margin between product pricing and the overall costs to collect used oil. Levels of activity and ultimate performance associated with this segment can be impacted by economic conditions and product demand in the manufacturing and automotive services markets, product pricing, efficiency of our operations, partnerships, technology, weather conditions, changing regulations, competition and the management of our related operating costs. Costs incurred in connection with the collection of used oil and other raw materials associated with the segment’s oil related products can also be volatile and can be impacted by global events and their relative impact on commodity products and pricing. The overall market price of oil and regulations that change the possible usage of used oil or burning of used oil as a fuel, impact the premium the segment can charge for used oil collections.
Highlights
Total direct revenues for the three and nine months ended September 30, 2024 were $1,529.4 million and $4,458.8 million, compared with $1,365.7 million and $4,071.0 million for the three and nine months ended September 30, 2023. Our Environmental Services segment direct revenues increased $150.8 million and $389.9 million or 13.2% and 11.5% for the three and nine months ended September 30, 2024, respectively, from the comparable periods in 2023 driven by growth in Field and Emergency Response Services, including the contributions from the acquisition of HEPACO, Technical Services and Safety-Kleen core service offerings. For the three months ended September 30, 2024, our SKSS segment direct revenues increased $12.9 million or 5.9%, from the comparable period in 2023, driven by contributions from our acquisition of Noble. For the nine months ended September 30, 2024, SKSS segment direct revenues decreased $2.0 million or 0.3% from the comparable period in 2023, due to lower base and blended oil product revenues resulting from market-driven pricing and lower volumes of base oil sold partially offset by contributions from Noble Oil. Foreign currency translation of our Canadian operations negatively impacted our consolidated direct revenues by $2.8 million and $5.3 million in the three and nine months ended September 30, 2024, respectively, compared to the same periods in 2023.
Income from operations for the three and nine months ended September 30, 2024 was $192.3 million and $533.3 million, compared with $154.4 million and $465.1 million in the three and nine months ended September 30, 2023, representing an increase of 24.6% and 14.6%, respectively. Net income for the three and nine months ended September 30, 2024 was $115.2 million and $318.3 million, compared with net income of $91.3 million and $279.5 million in the three and nine months ended September 30, 2023, representing an increase of 26.1% and 13.9%, respectively.
Adjusted EBITDA, which is the primary financial measure by which we evaluate our segments, increased $46.8 million or 18.4% from $255.0 million in the three months ended September 30, 2023 to $301.8 million in the three months ended September 30, 2024. Adjusted EBITDA increased $102.1 million or 13.5% from $757.7 million in the nine months ended September 30, 2023 to $859.7 million in the nine months ended September 30, 2024. This Adjusted EBITDA growth is primarily driven by contributions from the Environmental Services Segment. Additional information regarding Adjusted EBITDA, which is a non-GAAP measure, including a reconciliation of net income to Adjusted EBITDA, appears below under “Adjusted EBITDA.”
Net cash from operating activities for the nine months ended September 30, 2024 increased $18.1 million from $455.7 million in 2023 to $473.8 million in 2024. Adjusted free cash flow, which management uses to measure our financial strength and ability to generate cash, decreased $38.6 million in the nine months ended September 30, 2024 as compared to 2023. The decrease in adjusted free cash flow was driven by higher planned spend on property, plant and equipment including incremental investments in vehicles, machinery and equipment and notable project spend at our Baltimore, Maryland facility and Kimball, Nebraska incinerator and increased working capital balances, partially offset by higher cash flow from operations. Additional information regarding adjusted free cash flow, which is a non-GAAP measure, including a reconciliation of net cash from operating activities to adjusted free cash flow, appears below under “Adjusted Free Cash Flow.
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Segment Performance
The primary financial measure by which we evaluate the performance of our segments is Adjusted EBITDA. The following table sets forth certain financial information associated with our results of operations for the three and nine months ended September 30, 2024 and September 30, 2023 (in thousands, except percentages):
 Summary of Operations
 Three Months EndedNine Months Ended
September 30,September 30,
 20242023
Change
%
Change
20242023Change% Change
Direct Revenues (1):
    
Environmental Services$1,297,187$1,146,363$150,82413.2%$3,779,080$3,389,140$389,94011.5%
Safety-Kleen Sustainability Solutions232,139219,22112,9185.9679,459681,508(2,049)(0.3)
Corporate Items96112(16)N/M297335(38)N/M
Total1,529,4221,365,696163,72612.04,458,8364,070,983387,8539.5
Cost of Revenues (2):
      
Environmental Services874,414766,242108,17214.12,541,0172,300,853240,16410.4
Safety-Kleen Sustainability Solutions171,120169,2071,9131.1496,441498,965(2,524)(0.5)
Corporate Items10,0658,5021,563N/M24,75323,1591,594N/M
Total1,055,599943,951111,64811.83,062,2112,822,977239,2348.5
Selling, General & Administrative Expenses:     
Environmental Services90,27191,139(868)(1.0)281,171265,33815,8336.0
Safety-Kleen Sustainability Solutions19,79318,8689254.960,61656,5194,0977.2
Corporate Items67,78261,0126,77011.1215,803183,29732,50617.7
Total177,846171,0196,8274.0557,590505,15452,43610.4
Adjusted EBITDA:      
Environmental Services332,502288,98243,52015.1956,892822,949133,94316.3
Safety-Kleen Sustainability Solutions41,22631,14610,08032.4122,402126,024(3,622)(2.9)
Corporate Items (71,914)(65,111)(6,803)(10.4)(219,569)(191,312)(28,257)(14.8)
Total$301,814$255,017$46,79718.4$859,725$757,661$102,06413.5%
Adjusted EBITDA as a % of Direct Revenues:
Environmental Services (3)
25.6 %25.2 %0.4 %25.3 %24.3 %1.0 %
Safety-Kleen Sustainability Solutions(3)
17.8 %14.2 %3.6 %18.0 %18.5 %(0.5)%
Corporate Items (4)
(4.7)%(4.8)%0.1 %(4.9)%(4.7)%(0.2)%
Total19.7 %18.7 %1.0 %19.3 %18.6 %0.7 %
_____________________
N/M = not meaningful
(1)Direct revenues are revenues allocated to the segment performing the provided service.
(2)Cost of revenues are shown exclusive of items presented separately on the consolidated statements of operations which consist of (i) accretion of environmental liabilities and (ii) depreciation and amortization.
(3)Calculated as a percentage of individual segment direct revenue.
(4)Calculated as a percentage of total Company direct revenue.
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Direct Revenues
There are many factors which can impact our revenues including, but not limited to: overall levels of industrial activity and economic growth in North America, competitive industry pricing, overall market incineration capacity including captive incineration closures, changes in the regulatory environment including those related to per- and polyfluoroalkyl substances (“PFAS”), impacts of acquisitions and divestitures, the level of emergency response services, government infrastructure investment, reshoring of domestic manufacturing, existence or non-existence of large scale environmental waste and remediation projects, weather related events, the number of parts washers placed at customer sites, miles driven and related lubricant demand, base and blended oil pricing, market supply for base oil products, market changes relative to the collection of used oil and foreign currency translation. In addition, customer efforts to minimize hazardous waste and changes in regulation can impact our revenues.
Environmental Services     
Three Months EndedNine Months Ended
September 30,2024 over 2023September 30,2024 over 2023
(in thousands, except percentages)20242023
Change
%
Change
20242023Change% Change
Direct revenues$1,297,187 $1,146,363 $150,824 13.2 %$3,779,080 $3,389,140 $389,940 11.5 %
Environmental Services direct revenues for the three months ended September 30, 2024 increased $150.8 million from the comparable period in 2023 due to growth across most of our service lines driven by acquisitive growth and incremental revenues from legacy operations. Field and emergency response service revenues increased $105.2 million from the comparable period in 2023 driven by incremental revenue of approximately $75 million from the acquisition of HEPACO as well as contributions from our legacy field services operations. Technical services revenue increased $33.3 million largely due to contributions across our portfolio of waste disposal facilities, including higher incineration pricing and volumes. For the three months ended September 30, 2024, utilization at our incinerators increased from 86% to 89%. Revenues for Safety-Kleen core service offerings grew by $18.6 million from the comparable period in 2023 driven by improved pricing and greater demand for our containerized waste, vacuum and parts washer services. These increases were partially offset by decreased revenues from our industrial services operations for the three months ended September 30, 2024, which declined $4.7 million due to lower turnaround activity late in the quarter, as compared to the same period in 2023. Direct revenues for Canadian operations of the Environmental Services segment decreased by $2.2 million due to foreign currency translation.
Environmental Services direct revenues for the nine months ended September 30, 2024 increased $389.9 million from the comparable period in 2023 due to growth across most of our service lines driven by incremental revenues from legacy operations and acquisitive growth. Field and emergency response service revenues for the nine months ended September 30, 2024 increased $219.1 million from the comparable period in 2023 driven by incremental revenue of approximately $160 million from the acquisition of HEPACO as well as overall growth in core field and emergency response service offerings. Technical services revenue increased $128.0 million largely due to higher incineration pricing and volume coupled with improved pricing at our landfill facilities. Utilization at our incinerators increased from 83% to 85% for the nine months ended September 30, 2024 as compared to the same period in 2023. Revenues for Safety-Kleen core service offerings for the nine months ended September 30, 2024 grew by $63.1 million from the comparable period in 2023 due to improved pricing and greater demand for our containerized waste, vacuum and parts washer services. Revenue from our industrial services operations declined $21.7 million due to lower turnaround activity and related high-value services for the nine months ended September 30, 2024 compared to the same period in 2023, partially offset by incremental revenue from the acquisition of Thompson Industrial Services which occurred in March 2023. Direct revenues for Canadian operations of the Environmental Services segment decreased by $4.3 million due to foreign currency translation.
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Safety-Kleen Sustainability Solutions
Three Months EndedNine Months Ended
September 30,2024 over 2023September 30,2024 over 2023
(in thousands, except percentages)20242023Change%
Change
20242023Change% Change
Direct revenues$232,139 $219,221 $12,918 5.9 %$679,459 $681,508 $(2,049)(0.3)%
In the three months ended September 30, 2024, SKSS direct revenues increased $12.9 million from the comparable period in 2023 due to a $16.8 million increase in revenues from the sale of vacuum gas oil and specialty refinery products largely resulting from the acquisition of Noble which took place on March 1, 2024. This increase was partially offset by a $1.8 million decrease in revenues from the collection of used oil despite an increase in the volume collected in the three months ended September 30, 2024 when compared to the used oil collections in the same period of 2023. Revenues from the sale of base and blended oil products were relatively flat due to unfavorable market conditions.
In the nine months ended September 30, 2024, SKSS direct revenues decreased $2.0 million from the comparable period in 2023 largely due to a $12.8 million reduction in revenues from base oil sales driven primarily by lower pricing and, to a lesser extent, lower volumes sold. Revenue from contract packaging decreased $8.9 million and revenues generated from the sales of other products decreased $5.2 million for the nine months ended September 30, 2024 as compared to the same period in 2023. Revenue from the sales of blended oil products decreased by $2.3 million in the nine months ended September 30, 2024 when compared with the same period in the prior year, primarily due to lower pricing despite increased volume sold. These decreases were partially offset by a $27.2 million increase in revenues from the sale of vacuum gas oil and specialty refinery products primarily driven by the acquisition of Noble as well as a $2.3 million increase in revenues from the collection of used oil driven by higher volume collected in the nine months ended September 30, 2024 when compared to the used oil collections in the same period of 2023.
Cost of Revenues 
We believe that management of operating costs is vital to our ability to remain price competitive. We continue to experience inflationary pressures across several cost categories, but most notably related to internal and external labor, transportation, maintenance costs, and energy related costs. We aim to manage these increases through constant cost monitoring and a focus on cost saving areas, including lowering employee turnover, as well as our overall customer pricing strategies designed to offset the inflationary impacts on our margins.
We continue to upgrade the quality and efficiency of our services through the development of new technology and continued modifications and expansion at our facilities while also leveraging certain fixed costs of our operating infrastructure. We invest in new business opportunities and aggressively implement strategic sourcing and logistics solutions, while also continuing to optimize our management and operating structure in an effort to manage our operating margins.
Environmental Services
Three Months EndedNine Months Ended
September 30,2024 over 2023September 30,2024 over 2023
(in thousands, except percentages)20242023
Change
%
Change
20242023Change% Change
Cost of revenues$874,414$766,242$108,17214.1 %$2,541,017$2,300,853$240,16410.4 %
As a % of Direct revenues67.4 %66.8 %0.6 %67.2 %67.9 %(0.7)%
Environmental Services cost of revenues for the three months ended September 30, 2024 increased $108.2 million from the comparable period in 2023 while remaining relatively consistent as a percentage of revenues. Commensurate with the revenue growth in the business and recent acquisition of HEPACO, labor and benefit related costs increased $54.3 million, equipment and supply costs increased $41.6 million and external transportation, vehicle and fuel related costs increased $13.3 million for the three months ended September 30, 2024 when compared to the three months ended September 30, 2023.
Environmental Services cost of revenues for the nine months ended September 30, 2024 increased $240.2 million from the comparable period in 2023, however as a percentage of revenues decreased 0.7%. Commensurate with the revenue growth in the business and recent acquisitions, labor and benefit related costs increased $130.3 million, equipment and supply costs increased $77.2 million and external transportation, vehicle and fuel related costs increased $24.6 million for the nine months ended September 30, 2024 when compared to the nine months ended September 30, 2023. Overall, the growth of revenue outpaced cost increases resulting in the improved margin of the segment.
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Safety-Kleen Sustainability Solutions
Three Months EndedNine Months Ended
September 30,2024 over 2023September 30,2024 over 2023
(in thousands, except percentages)20242023
Change
%
Change
20242023Change% Change
Cost of revenues$171,120$169,207$1,9131.1 %$496,441$498,965$(2,524)(0.5)%
As a % of Direct revenues73.7 %77.2 %(3.5)%73.1 %73.2 %(0.1)%
SKSS cost of revenues for the three months ended September 30, 2024 increased $1.9 million from the comparable period in 2023, driven by the revenue increase discussed above. As a percentage of revenues these costs decreased by 3.5% due to lower re-refinery operating costs incurred during the period.
SKSS cost of revenues for the nine months ended September 30, 2024 decreased $2.5 million from the comparable period in 2023 and remained relatively consistent as a percentage of revenues driven by market related pricing decreases discussed in the revenue section above, partially offset by lower re-refinery operating costs incurred specifically in the three months ended September 30, 2024 as compared to the same period in the prior year.
Selling, General and Administrative Expenses
We strive to manage our selling, general and administrative (“SG&A”) expenses commensurate with the overall performance of our segments and corresponding revenue levels. We believe our ability to properly align these costs with business performance is reflective of our strong management of the businesses and further promotes our ability to remain competitive in the marketplace.
Environmental Services
Three Months EndedNine Months Ended
September 30,2024 over 2023September 30,2024 over 2023
(in thousands, except percentages)20242023
Change
%
Change
20242023Change% Change
SG&A expenses$90,271$91,139$(868)(1.0)%$281,171$265,338$15,8336.0 %
As a % of Direct revenues7.0 %8.0 %(1.0)%7.4 %7.8 %(0.4)%
Environmental Services SG&A expenses for the three months ended September 30, 2024 remained relatively consistent with the comparable periods in 2023, and decreased 1.0% as a percentage of segment revenues, primarily driven by lower labor and benefit related costs, continuing our trend of leveraging our SG&A base in the midst of the revenue growth discussed above.
Environmental Services SG&A expenses for the nine months ended September 30, 2024 increased $15.8 million, from the comparable periods in 2023, however, remained relatively consistent as a percentage of segment revenues, continuing our trend of leveraging our SG&A base in the midst of revenue growth discussed above. SG&A expenses for the nine months ended September 30, 2024 increased approximately $10 million due to additional costs from the HEPACO operations. The remaining increases were spread across various cost categories and were driven by overall growth in the segment results.
Safety-Kleen Sustainability Solutions
Three Months EndedNine Months Ended
September 30,2024 over 2023September 30,2024 over 2023
(in thousands, except percentages)20242023
Change
%
Change
20242023Change% Change
SG&A expenses$19,793$18,868$9254.9 %$60,616$56,519$4,0977.2 %
As a % of Direct revenues8.5 %8.6 %(0.1)%8.9 %8.3 %0.6 %
SKSS SG&A expenses for the three months ended September 30, 2024 increased $0.9 million and remained relatively consistent, as a percentage of revenues, when compared to the same period in 2023. Overall, labor and benefit related costs increased $1.4 million, mainly driven by increased costs from Noble operations. This increase was partially offset by a $1.1 million increase to a remedial liability reserve in 2023 which did not recur in 2024.
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For the nine months ended September 30, 2024, SKSS SG&A expenses increased $4.1 million, and as a percentage of revenues, remained relatively consistent with the prior year. Overall, labor and benefit related costs increased $5.0 million in the nine months ended September 30, 2024 when compared to the same period in 2023, mainly driven by increased costs from Noble operations. This cost increase was partially offset by a $1.1 million increase to remedial liability reserves in 2023 which did not recur in 2024.
Corporate Items
Three Months EndedNine Months Ended
September 30,2024 over 2023September 30,2024 over 2023
(in thousands, except percentages)20242023
Change
%
Change
20242023Change% Change
SG&A expenses$67,782$61,012$6,77011.1 %$215,803$183,297$32,50617.7 %
As a % of Total Company Direct revenues4.4 %4.5 %(0.1)%4.8 %4.5 %0.3 %
Corporate SG&A expenses for the three months ended September 30, 2024 increased $6.8 million from the same period in the prior year yet remained relatively consistent as a percentage of our total direct revenues. The increase in Corporate SG&A expenses for the three months ended September 30, 2024 was driven by a $5.3 million increase in labor and benefits related costs, including stock-based compensation, primarily resulting from incremental headcount from the acquired operations and a $1.2 million increase in information technology related costs.
Corporate SG&A expenses for the nine months ended September 30, 2024 increased $32.5 million yet remained relatively consistent as a percentage of our total direct revenues when compared to the same period in the prior year. The increase in Corporate SG&A expenses for the nine months ended September 30, 2024 was driven by a $21.7 million increase in labor and benefits related costs, including stock-based compensation, a $3.6 million change in legal reserve costs and a $2.4 million increase in information technology related costs.
Adjusted EBITDA
Management considers Adjusted EBITDA to be a measurement of performance which provides useful information to both management and investors. Adjusted EBITDA should not be considered an alternative to net income or other measurements under generally accepted accounting principles (“GAAP”). We define Adjusted EBITDA as net income plus accretion of environmental liabilities, stock-based compensation, depreciation and amortization, net interest expense, loss on early extinguishment of debt and provision for income taxes and excludes other gains, losses and non-cash charges not deemed representative of fundamental segment results and other expense (income), net. Adjusted EBITDA is not calculated identically by all companies and therefore our measurements of Adjusted EBITDA, while defined consistently with our existing credit agreement, may not be comparable to similarly titled measures reported by other companies.
We use Adjusted EBITDA to enhance our understanding of our operating performance, which represents our views concerning our performance in the ordinary, ongoing and customary course of our operations. We historically have found it helpful, and believe that investors have found it helpful, to consider an operating measure that excludes certain expenses relating to transactions not reflective of our core operations.
The information about our operating performance provided by Adjusted EBITDA is used by our management for a variety of purposes. We regularly communicate Adjusted EBITDA results to our lenders since our loan covenants are based upon levels of Adjusted EBITDA achieved and to our board of directors and we discuss with the board our interpretation of such results. We also compare our Adjusted EBITDA performance against internal targets as a key factor in determining cash and equity bonus compensation for executives and other employees, largely because we believe that this measure is indicative of how the fundamental business is performing and being managed.
We also provide information relating to our Adjusted EBITDA so that analysts, investors and other interested persons have the same data that we use to assess our core operating performance. We believe that Adjusted EBITDA should be viewed only as a supplement to the GAAP financial information. We also believe, however, that providing this information in addition to, and together with, GAAP financial information provides a better understanding of our core operating performance and how management evaluates and measures our performance.
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The following table presents Adjusted EBITDA as well as Adjusted EBITDA as a percentage of Direct Revenues by segment (in thousands, except percentages):
 Three Months EndedNine Months Ended
September 30,2024 over 2023September 30,2024 over 2023
(in thousands, except percentages)20242023Change%
Change
20242023Change% Change
Adjusted EBITDA:    
Environmental Services$332,502$288,982$43,52015.1 %$956,892$822,949$133,94316.3 %
Safety-Kleen Sustainability Solutions41,22631,14610,08032.4 122,402126,024(3,622)(2.9)
Corporate Items (71,914)(65,111)(6,803)(10.4)(219,569)(191,312)(28,257)(14.8)
Total$301,814$255,017$46,79718.4 %$859,725$757,661$102,06413.5 %
Adjusted EBITDA as a % of Direct Revenues (1):
Environmental Services25.6 %25.2 %0.4 %25.3 %24.3 %1.0 %
Safety-Kleen Sustainability Solutions17.8 %14.2 %3.6 %18.0 %18.5 %(0.5)%
Corporate Items(4.7)%(4.8)%0.1 %(4.9)%(4.7)%(0.2)%
Total19.7 %18.7 %1.0 %19.3 %18.6 %0.7 %
______________
(1)    Environmental Services and SKSS calculated as a percentage of individual segment direct revenues. Corporate Items calculated as a percentage of total Company direct revenues.
The following is a reconciliation of net income to Adjusted EBITDA for the following periods (in thousands, except percentages):
Three Months EndedNine Months Ended
 September 30,September 30,
 2024202320242023
Net income$115,213 $91,340 $318,325 $279,507 
Accretion of environmental liabilities3,618 3,388 10,139 10,281 
Stock-based compensation5,837 4,291 20,690 14,809 
Depreciation and amortization100,063 92,970 295,632 267,425 
Other expense (income), net1,123 (334)2,431 833 
Loss on early extinguishment of debt— — — 2,362 
Interest expense, net of interest income35,779 29,696 100,767 80,400 
Provision for income taxes40,181 33,666 111,741 102,044 
Adjusted EBITDA$301,814 $255,017 $859,725 $757,661 
As a % of Direct revenues19.7 %18.7 %19.3 %18.6 %
Depreciation and Amortization
Three Months EndedNine Months Ended
September 30,2024 over 2023September 30,2024 over 2023
(in thousands, except percentages)20242023Change%
Change
20242023Change% Change
Depreciation of fixed assets and amortization of landfills and finance leases$86,201 $80,432 $5,769 7.2 %$254,888 $229,658 $25,230 11.0 %
Permits and other intangibles amortization13,862 12,538 1,324 10.6 40,744 37,767 2,977 7.9 
Total depreciation and amortization$100,063 $92,970 $7,093 7.6 %$295,632 $267,425 $28,207 10.5 %
Depreciation and amortization for the three and nine months ended September 30, 2024 increased by $7.1 million and $28.2 million from the comparable periods in 2023 due to the depreciation of fixed assets and amortization of intangible assets placed in service in the last quarter of 2023 and throughout 2024 including the incremental assets acquired from the March 2024 HEPACO and Noble acquisitions.
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Loss on Early Extinguishment of Debt
Three Months EndedNine Months Ended
September 30,2024 over 2023September 30,2024 over 2023
(in thousands, except percentages)20242023Change%
Change
20242023Change% Change
Loss on early extinguishment of debt$— $— $— — %$— $(2,362)$2,362 100.0 %
During the nine months ended September 30, 2023, we recorded a $2.4 million loss on early extinguishment of debt in connection with the repayment of outstanding debt due in 2024.
Interest Expense, Net of Interest Income
Three Months EndedNine Months Ended
September 30,2024 over 2023September 30,2024 over 2023
(in thousands, except percentages)20242023Change%
Change
20242023Change% Change
Interest expense, net of interest income$35,779 $29,696 $6,083 20.5 %$100,767 $80,400 $20,367 25.3 %
Interest expense, net of interest income for the three months ended September 30, 2024 increased $6.1 million from the comparable period in 2023 due to higher levels of outstanding debt as a result of the 2024 Incremental Term Loans entered into on March 22, 2024. Interest expense was partially offset by a $2.5 million increase in interest income in the three months ended September 30, 2024 compared to the comparable period in 2023.
Interest expense, net of interest income for the nine months ended September 30, 2024 increased $20.4 million from the comparable period in 2023. During the nine months ended September 30, 2023, interest expense, net of interest income included an $8.3 million benefit recognized from settling interest rate swaps in that prior year period.
Absent this benefit, interest expense, net of interest income, for the nine months ended September 30, 2024 increased $12.1 million from the comparable period in 2023 due to the 2024 Incremental Term Loans discussed above. Interest expense was partially offset by a $5.4 million increase in interest income in the nine months ended September 30, 2024 compared to the comparable period in 2023.
As of September 30, 2024, the effective interest rate on our debt was 5.6%. For the remainder of 2024, we expect interest expense to continue to trend higher than the prior year due to higher levels of outstanding debt and a slightly higher weighted average effective interest rate. For additional information regarding the financing events during 2024 and our current portfolio of long-term debt, see Note 11, “Financing Arrangements,” to the accompanying unaudited consolidated financial statements.
Provision for Income Taxes
Three Months EndedNine Months Ended
September 30,2024 over 2023September 30,2024 over 2023
(in thousands, except percentages)20242023Change%
Change
20242023Change% Change
Provision for income taxes$40,181$33,666$6,51519.4 %$111,741$102,044$9,6979.5 %
Effective tax rate25.9 %26.9 %(1.0)%26.0 %26.7 %(0.7)%
For the three and nine months ended September 30, 2024, the provision for income taxes increase was consistent with the increase in pre-tax income compared to the prior period. Our effective tax rates for the three and nine months ended September 30, 2024 remained relatively consistent compared to the prior periods.
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Liquidity and Capital Resources 
We assess our liquidity in terms of our ability to generate cash to fund our operating, investing, and financing activities. Our primary ongoing cash requirements will be to fund operations, capital expenditures, interest payments and investments in line with our business strategy as of the date of this report. We believe our future operating cash flows will be sufficient to meet our future operating and internal investing cash needs. We monitor our actual needs and forecasted cash flows, our liquidity and our capital resources, enabling us to plan our present needs and fund items that may arise during the year as a result of changing business conditions or opportunities. Furthermore, our existing cash balance and the availability of additional borrowings under our revolving credit facility provide additional potential sources of liquidity should they be required.
Summary of Cash Flow Activity
Nine Months Ended
September 30,
(in thousands)20242023
Net cash from operating activities$473,833 $455,692 
Net cash used in investing activities(812,940)(447,069)
Net cash from (used in) financing activities408,555 (165,322)
Net cash from operating activities
Net cash from operating activities for the nine months ended September 30, 2024 was $473.8 million as compared to $455.7 million in the same period in 2023. This $18.1 million increase in operating cash flows was attributable to an increase in operating income of $68.1 million, lower cash paid for taxes of $6.6 million, and a $4.4 million reduction in environmental expenditures for the nine months ended September 30, 2024 as compared to the same period in 2023. These were partially offset by increased working capital balances and an increase in cash paid for interest of $33.4 million.
Net cash used in investing activities
Net cash used in investing activities for the nine months ended September 30, 2024 was $812.9 million, an increase of $365.9 million from the comparable period in 2023. Cash used for acquisitions increased $354.4 million as we paid more for the acquisitions of HEPACO and Noble in 2024 than we did for the acquisition of Thompson Industrial in 2023. Additions to property, plant and equipment increased $57.9 million, largely driven by increased investments in vehicles, machinery and equipment for our operations and notable project spend including $15.8 million spent on the Baltimore, Maryland facility. The remaining change in net cash used in investing activities was due to the timing of transactions within our wholly owned captive insurance company which resulted in a $26.3 million cash inflow in the nine months ended September 30, 2024 as compared to a $19.9 million cash outflow in the nine months ended 2023.
Net cash from (used in) financing activities
Net cash from financing activities for the nine months ended September 30, 2024 was $408.6 million, as compared to net cash used in financing activities of $165.3 million for the nine months ended September 30, 2023. The primary drivers of this change were the incurrence of additional term loans net of discount of $499.4 million in 2024 as compared to a net $121.5 million repayment of debt in 2023. Partially offsetting this activity was an increase in finance lease payments of $12.0 million.
Adjusted Free Cash Flow
Management considers adjusted free cash flow to be a measure of liquidity which provides useful information to both management, creditors and investors about our financial strength and our ability to generate cash. Additionally, adjusted free cash flow is a metric on which a portion of management incentive compensation is based. We believe that adjusted free cash flow should be viewed only as a supplement to the GAAP financial information. We define adjusted free cash flow as net cash from operating activities excluding cash impacts of items derived from non-operating activities, less additions to property, plant and equipment plus proceeds from sales or disposals of fixed assets. Adjusted free cash flow should not be considered an alternative to net cash from operating activities or other measurements under GAAP. Adjusted free cash flow is not calculated identically by all companies, and therefore our measurements of adjusted free cash flow may not be comparable to similarly titled measures reported by other companies.
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The following is a reconciliation of net cash from operating activities to adjusted free cash flow for the following periods (in thousands):
Nine Months Ended
 September 30,
 20242023
Net cash from operating activities$473,833 $455,692 
Additions to property, plant and equipment(369,826)(311,906)
Proceeds from sale and disposal of fixed assets6,353 5,129 
Adjusted free cash flow$110,360 $148,915 
Summary of Capital Resources
At September 30, 2024, cash and cash equivalents and marketable securities totaled $594.7 million, compared to $550.8 million at December 31, 2023. At September 30, 2024, cash and cash equivalents held by our Canadian subsidiaries totaled $46.8 million. The cash and cash equivalents and marketable securities balance for our U.S. operations was $547.9 million at September 30, 2024. Our U.S. operations had net operating cash inflows of $478.3 million for the nine months ended September 30, 2024.
We maintain a $600.0 million revolving credit facility of which, as of September 30, 2024, approximately $469.8 million was available to borrow under the facility, with letters of credit of $130.2 million outstanding.
Material Capital Requirements
Capital Expenditures
Capital expenditures during the first nine months of 2024 were $369.8 million as compared to $311.9 million during the first nine months of 2023. The increase was driven by incremental investments in our fleet and equipment and Baltimore, Maryland facility as well as incremental spend on the Kimball incinerator. We anticipate that 2024 capital spending, net of disposals, will be in the range of $400.0 million to $430.0 million.
We are nearing the completion of the construction of our new incinerator in Kimball, Nebraska and intend to commence operations in the fourth quarter of 2024. Total spending on the project as of September 30, 2024 was $198.0 million. Capital spending on the strategic project in Baltimore, Maryland for the first nine months of 2024 was $15.8 million for the purchase of the facility and site improvements.
We anticipate that the capital spending will be funded by cash from our operations. Unanticipated changes in environmental regulations could require us to make significant capital expenditures for our facilities and adversely affect our results of operations and cash flow.
Financing Arrangements
As of September 30, 2024, our financing arrangements include (i) $545.0 million of 4.875% senior unsecured notes due 2027, (ii) $1,468.7 million of senior secured term loans due 2028, (iii) $300.0 million of 5.125% senior unsecured notes due 2029 and (iv) $500.0 million of 6.375% senior unsecured notes due 2031. As noted above, we also maintain our $600.0 million revolving credit facility with no amounts owed as of September 30, 2024.
The material terms of these arrangements are discussed further in Note 11, “Financing Arrangements,” to the accompanying unaudited consolidated financial statements.
As of September 30, 2024, we were in compliance with the covenants of all of our debt agreements, and we believe we will continue to meet such covenants.
Common Stock Repurchases Pursuant to Publicly Announced Plan
The Company’s common stock repurchases are made pursuant to the previously authorized board approved plan to repurchase up to $1.1 billion of the Company’s common stock. During the three and nine months ended September 30, 2024, the Company repurchased and retired 84,910 and 135,572 shares, respectively, of the Company’s common stock for total expenditures of $20.0 million and $30.0 million, respectively. During the three and nine months ended September 30, 2023, the Company repurchased and retired a total of 58,341 and 117,064 shares, respectively, of the Company’s common stock for total expenditures of $10.0 million and $18.0 million, respectively.
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Through September 30, 2024, the Company has repurchased and retired a total of approximately 8.7 million shares of its common stock for $575.9 million under the board approved plan, and as of September 30, 2024, an additional $524.1 million remained available for repurchase of shares.
Environmental Liabilities
(in thousands, except percentages)September 30, 2024December 31, 2023Change% Change
Closure and post-closure liabilities$119,578 $118,600 $978 0.8 %
Remedial liabilities110,658 111,243 (585)(0.5)
Total environmental liabilities$230,236 $229,843 $393 0.2 %
Total environmental liabilities as of September 30, 2024 were $230.2 million, relatively consistent with the balance as of December 31, 2023. During the nine months ended September 30, 2024, the environmental liability balance increased due to accretion of $10.1 million, new environmental liabilities, including those assumed through acquisition, of $5.9 million and changes in environmental liability estimates of $4.4 million. These increases were partially offset by expenditures of $19.7 million. The liability estimate increase was primarily driven by a $2.9 million increase to the remedial liability reserve for a Superfund site.
We anticipate our environmental liabilities, substantially all of which we assumed in connection with our acquisitions, will be payable over many years and that cash flow from operations will generally be sufficient to fund the payment of such liabilities when required.
Events not anticipated (such as future changes in environmental laws and regulations) could require that payments to satisfy our environmental liabilities be made earlier or in greater amounts than currently anticipated, which could adversely affect our results of operations, cash flow and financial condition. Conversely, the development of new treatment technologies or other circumstances may arise in the future which may reduce amounts ultimately paid.
Letters of Credit
We obtain standby letters of credit as security for financial assurances we have been required to provide to regulatory bodies for our hazardous waste facilities and which would be called only in the event that we fail to satisfy closure, post-closure and other obligations under the permits issued by those regulatory bodies for such licensed facilities. As of September 30, 2024, there were $130.2 million outstanding letters of credit. See Note 11, “Financing Arrangements,” to the accompanying unaudited consolidated financial statements.
Critical Accounting Policies and Estimates
In the first nine months of 2024, there were no material changes to the information provided under the heading “Critical Accounting Estimates” included in our Annual Report on Form 10-K for the year ended December 31, 2023. For more information regarding our accounting policies, please refer to Note 2, “Significant Accounting Policies” to the accompanying unaudited consolidated financial statements.

ITEM 3.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK 
In the first nine months of 2024, there were no material changes to the information provided under Item 7A. “Quantitative and Qualitative Disclosures about Market Risk” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023.
ITEM 4.    CONTROLS AND PROCEDURES
Evaluation of Disclosure Controls and Procedures
Based on an evaluation under the supervision and with the participation of our Co-Chief Executive Officers and Chief Financial Officer, as of the end of the period covered by this Quarterly Report on Form 10-Q, our Co-Chief Executive Officers and Chief Financial Officer have concluded that our disclosure controls and procedures (as defined under Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) were effective as of September 30, 2024 to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in Securities and Exchange Commission rules and forms and is accumulated and communicated to our management, including our Co-Chief Executive Officers and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.
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Changes in Internal Control over Financial Reporting
There were no changes in the Company’s internal control over financial reporting identified in connection with the evaluation required by paragraph (d) of Exchange Act Rules 13a-15 or 15d-15 that was conducted during the quarter ended September 30, 2024 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.
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CLEAN HARBORS, INC. AND SUBSIDIARIES
PART II—OTHER INFORMATION
ITEM 1.    LEGAL PROCEEDINGS
See Note 15, “Commitments and Contingencies,” to the unaudited consolidated financial statements included in Item 1 of this report, which description is incorporated herein by reference.

ITEM 1A.     RISK FACTORS
There have been no material changes to the risk factors from the information provided in Item 1A. in the Company's Annual Report on Form 10-K for the year ended December 31, 2023.

ITEM 2.     UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS
Common Stock Repurchase Program
The following table provides information with respect to the shares of common stock repurchased by us for the periods indicated:
Period
Total Number of Shares Purchased (1)
Average Price Paid Per Share (2)
Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs
(in thousands) (3)
July 1, 2024 through July 31, 202425,752 $220.63 — $544,101 
August 1, 2024 through August 31, 202445,116 232.87 43,028 534,101 
September 1, 2024 through September 30, 202444,800 239.23 41,882 524,101 
Total115,668 $232.61 84,910 
    ________________
(1)    Includes 30,758 shares withheld by us from employees to satisfy employee tax obligations upon vesting of restricted stock granted to our employees under the Company’s equity incentive plans.
(2)    The average price paid per share of common stock repurchased under the Company’s stock repurchase program includes the commissions paid to brokers.
(3)    The Company’s common stock repurchases are made pursuant to the stock repurchase plan, which was most recently authorized by the board of directors on December 5, 2024, to repurchase up to $1.1 billion of the Company’s common stock. The stock repurchase plan will expire when all of the available allotted funds under the stock repurchase plan are depleted. As of September 30, 2024, the amount available for repurchase under the board approved plan is $524.1 million. We have funded and intend to fund the repurchases through available cash resources. The stock repurchase program authorizes us to purchase our common stock on the open market or in privately negotiated transactions periodically in a manner that complies with applicable U.S. securities laws. The number of shares purchased and the timing of the purchases has depended and will depend on several factors, including share price, cash required for business plans, trading volume and other conditions. As part of our share repurchase program, we maintain a repurchase plan in accordance with Rule 10b5-1 promulgated under the Securities Exchange Act of 1934, as amended. During the three months ended September 30, 2024, no shares were repurchased under the Rule 10b5-1 plan. Future repurchases may be made as open market or privately negotiated transactions as described above. We have no obligation to repurchase stock under this program and may suspend or terminate the repurchase program at any time.

ITEM 3.     DEFAULTS UPON SENIOR SECURITIES
None

ITEM 4.    MINE SAFETY DISCLOSURES
Not applicable

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ITEM 5.     OTHER INFORMATION
During the quarter ended September 30, 2024, no director or “officer” (as defined in Rule 16a-1(f)) of Clean Harbors, Inc. adopted, modified or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K.

ITEM 6.    EXHIBITS
Item No. Description Location
10.1+(1)
31.1  Filed herewith
31.2Filed herewith
31.3  Filed herewith
32  Furnished herewith
101.SCH Inline XBRL Taxonomy Extension Schema Document Filed herewith
101.CALInline XBRL Taxonomy Extension Calculation Linkbase DocumentFiled herewith
101.LABInline XBRL Taxonomy Extension Label Linkbase DocumentFiled herewith
101.PREInline XBRL Taxonomy Extension Presentation Linkbase DocumentFiled herewith
101.DEFInline XBRL Taxonomy Extension Definition Linkbase DocumentFiled herewith
104Cover Page Interactive Data File (formatted as Inline XBRL with applicable taxonomy extension information contained in Exhibits 101*)Filed herewith
_______________________
(1) Incorporated by reference to Exhibit 4.43H to the Company’s Current Report on Form 8-K filed on October 11, 2024.
+ Certain schedules and similar attachments have been omitted. The Company agrees to furnish a supplemental copy to the SEC upon request.

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CLEAN HARBORS, INC. AND SUBSIDIARIES
SIGNATURES
    Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. 
 CLEAN HARBORS, INC.
 By:/s/ MICHAEL L. BATTLES
  Michael L. Battles
  Co-Chief Executive Officer and Co-President
Date:October 30, 2024  
 By:/s/ ERIC W. GERSTENBERG
  Eric W. Gerstenberg
  Co-Chief Executive Officer and Co-President
Date:October 30, 2024 
By:/s/ ERIC J. DUGAS
Eric J. Dugas
Executive Vice President and Chief Financial Officer
Date:October 30, 2024

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