For beginners, it can seem like a good idea (and an exciting prospect) to buy a company that tells a good story to investors, even if it currently lacks a track record of revenue and profit. Sometimes these stories can cloud the minds of investors, leading them to invest with their emotions rather than on the merit of good company fundamentals. Loss making companies can act like a sponge for capital - so investors should be cautious that they're not throwing good money after bad.

Despite being in the age of tech-stock blue-sky investing, many investors still adopt a more traditional strategy; buying shares in profitable companies like ACM Research (NASDAQ:ACMR). While this doesn't necessarily speak to whether it's undervalued, the profitability of the business is enough to warrant some appreciation - especially if its growing.

ACM Research's Earnings Per Share Are Growing

The market is a voting machine in the short term, but a weighing machine in the long term, so you'd expect share price to follow earnings per share (EPS) outcomes eventually. Therefore, there are plenty of investors who like to buy shares in companies that are growing EPS. To the delight of shareholders, ACM Research has achieved impressive annual EPS growth of 39%, compound, over the last three years. That sort of growth rarely ever lasts long, but it is well worth paying attention to when it happens.

It's often helpful to take a look at earnings before interest and tax (EBIT) margins, as well as revenue growth, to get another take on the quality of the company's growth. While we note ACM Research achieved similar EBIT margins to last year, revenue grew by a solid 47% to US$729m. That's progress.

In the chart below, you can see how the company has grown earnings and revenue, over time. To see the actual numbers, click on the chart.

The trick, as an investor, is to find companies that are going to perform well in the future, not just in the past. While crystal balls don't exist, you can check our visualization of consensus analyst forecasts for ACM Research's future EPS 100% free.

Are ACM Research Insiders Aligned With All Shareholders?

It's pleasing to see company leaders with putting their money on the line, so to speak, because it increases alignment of incentives between the people running the business, and its true owners. Shareholders will be pleased by the fact that insiders own ACM Research shares worth a considerable sum. We note that their impressive stake in the company is worth US$144m. This totals to 12% of shares in the company. Enough to lead management's decision making process down a path that brings the most benefit to shareholders. So there is opportunity here to invest in a company whose management have tangible incentives to deliver.

Should You Add ACM Research To Your Watchlist?

ACM Research's earnings have taken off in quite an impressive fashion. This level of EPS growth does wonders for attracting investment, and the large insider investment in the company is just the cherry on top. At times fast EPS growth is a sign the business has reached an inflection point, so there's a potential opportunity to be had here. So based on this quick analysis, we do think it's worth considering ACM Research for a spot on your watchlist. You should always think about risks though. Case in point, we've spotted 1 warning sign for ACM Research you should be aware of.

There's always the possibility of doing well buying stocks that are not growing earnings and do not have insiders buying shares. But for those who consider these important metrics, we encourage you to check out companies that do have those features. You can access a tailored list of companies which have demonstrated growth backed by significant insider holdings.

Please note the insider transactions discussed in this article refer to reportable transactions in the relevant jurisdiction.

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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.