Stocks making the biggest moves after the bell: WD-40 Company, Costco and more

These are the stocks moving the most in extended-hours trading:

$WDFC.US$
— Shares gained 11% after the maker of metal lubricants reported fiscal third-quarter results that beat analysts’ expectations. WD-40 posted earnings of $1.46 per share on revenue of $155 million, higher than the earnings of $1.39 per share on revenue of $145.8 million analysts were expecting, according to FactSet.

$PSMT.US$
— The membership warehouse club operator added 6% after posting a fiscal third-quarter earnings and revenue beat. PriceSmart’s adjusted earnings came to $1.08 per share, while analysts polled by FactSet had expected $1.01 per share. The company’s $1.23 billion in revenue was also higher than the $1.21 billion consensus estimate.

$COST.US$
— Shares gained 3% after the membership-only retail chain announced its first membership rate increase since 2017. Costco said it would be raising its membership by $5 for annual memberships, while its higher-tier plan would see a $10 increase.

$ON.US$ , $MCHP.US$
— The semiconductor stocks both lost 2% in extended-hours trading. This was a sharp reversal from their big gains in the regular session, when the stocks added 4.2% and 3.9%, respectively.