Like a puppy chasing its tail, some new investors often chase 'the next big thing', even if that means buying 'story stocks' without revenue, let alone profit. But as Warren Buffett has mused, 'If you've been playing poker for half an hour and you still don't know who the patsy is, you're the patsy.' When they buy such story stocks, investors are all too often the patsy.

In the age of tech-stock blue-sky investing, my choice may seem old fashioned; I still prefer profitable companies like Gentherm (NASDAQ:THRM). While that doesn't make the shares worth buying at any price, you can't deny that successful capitalism requires profit, eventually. Conversely, a loss-making company is yet to prove itself with profit, and eventually the sweet milk of external capital may run sour.

Check out our latest analysis for Gentherm

How Quickly Is Gentherm Increasing Earnings Per Share?

If a company can keep growing earnings per share (EPS) long enough, its share price will eventually follow. That makes EPS growth an attractive quality for any company. As a tree reaches steadily for the sky, Gentherm's EPS has grown 24% each year, compound, over three years. If the company can sustain that sort of growth, we'd expect shareholders to come away winners.

Careful consideration of revenue growth and earnings before interest and taxation (EBIT) margins can help inform a view on the sustainability of the recent profit growth. While Gentherm may have maintained EBIT margins over the last year, revenue has fallen. And that does make me a little more cautious of the stock.

In the chart below, you can see how the company has grown earnings, and revenue, over time. For finer detail, click on the image.

Of course the knack is to find stocks that have their best days in the future, not in the past. You could base your opinion on past performance, of course, but you may also want to check this interactive graph of professional analyst EPS forecasts for Gentherm.

Are Gentherm Insiders Aligned With All Shareholders?

I like company leaders to have some skin in the game, so to speak, because it increases alignment of incentives between the people running the business, and its true owners. As a result, I'm encouraged by the fact that insiders own Gentherm shares worth a considerable sum. To be specific, they have US$18m worth of shares. That's a lot of money, and no small incentive to work hard. Despite being just 0.7% of the company, the value of that investment is enough to show insiders have plenty riding on the venture.

Should You Add Gentherm To Your Watchlist?

Given my belief that share price follows earnings per share you can easily imagine how I feel about Gentherm's strong EPS growth. I think that EPS growth is something to boast of, and it doesn't surprise me that insiders are holding on to a considerable chunk of shares. So this is very likely the kind of business that I like to spend time researching, with a view to discerning its true value. Now, you could try to make up your mind on Gentherm by focusing on just these factors, or you could also consider how its price-to-earnings ratio compares to other companies in its industry.

Of course, you can do well (sometimes) buying stocks that are not growing earnings and do not have insiders buying shares. But as a growth investor I always like to check out companies that do have those features. You can access a free list of them here.

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

This article by Simply Wall St is general in nature. 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.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.