The stock price didn't jump after Lontium Semiconductor Corporation (SHSE:688486) posted decent earnings last week. We think that investors might be worried about some concerning underlying factors.

Zooming In On Lontium Semiconductor's Earnings

As finance nerds would already know, the accrual ratio from cashflow is a key measure for assessing how well a company's free cash flow (FCF) matches its profit. To get the accrual ratio we first subtract FCF from profit for a period, and then divide that number by the average operating assets for the period. This ratio tells us how much of a company's profit is not backed by free cashflow.

As a result, a negative accrual ratio is a positive for the company, and a positive accrual ratio is a negative. While having an accrual ratio above zero is of little concern, we do think it's worth noting when a company has a relatively high accrual ratio. To quote a 2014 paper by Lewellen and Resutek, "firms with higher accruals tend to be less profitable in the future".

Over the twelve months to September 2024, Lontium Semiconductor recorded an accrual ratio of 0.31. We can therefore deduce that its free cash flow fell well short of covering its statutory profit, suggesting we might want to think twice before putting a lot of weight on the latter. Indeed, in the last twelve months it reported free cash flow of CN¥66m, which is significantly less than its profit of CN¥126.3m. We note, however, that Lontium Semiconductor grew its free cash flow over the last year. However, that's not all there is to consider. The accrual ratio is reflecting the impact of unusual items on statutory profit, at least in part.

That might leave you wondering what analysts are forecasting in terms of future profitability. Luckily, you can click here to see an interactive graph depicting future profitability, based on their estimates.

The Impact Of Unusual Items On Profit

The fact that the company had unusual items boosting profit by CN¥18m, in the last year, probably goes some way to explain why its accrual ratio was so weak. We can't deny that higher profits generally leave us optimistic, but we'd prefer it if the profit were to be sustainable. We ran the numbers on most publicly listed companies worldwide, and it's very common for unusual items to be once-off in nature. And that's as you'd expect, given these boosts are described as 'unusual'. Assuming those unusual items don't show up again in the current year, we'd thus expect profit to be weaker next year (in the absence of business growth, that is).

Our Take On Lontium Semiconductor's Profit Performance

Summing up, Lontium Semiconductor received a nice boost to profit from unusual items, but could not match its paper profit with free cash flow. Considering all this we'd argue Lontium Semiconductor's profits probably give an overly generous impression of its sustainable level of profitability. With this in mind, we wouldn't consider investing in a stock unless we had a thorough understanding of the risks. For example, Lontium Semiconductor has 3 warning signs (and 1 which is potentially serious) we think you should know about.

In this article we've looked at a number of factors that can impair the utility of profit numbers, and we've come away cautious. But there are plenty of other ways to inform your opinion of a company. Some people consider a high return on equity to be a good sign of a quality business. So you may wish to see this free collection of companies boasting high return on equity, or this list of stocks with high insider ownership.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.