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 completely lacks a track record of revenue and 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 Ducommun (NYSE:DCO). 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 Ducommun

How Quickly Is Ducommun Increasing Earnings Per Share?

The market is a voting machine in the short term, but a weighing machine in the long term, so share price follows earnings per share (EPS) eventually. That makes EPS growth an attractive quality for any company. Who among us would not applaud Ducommun's stratospheric annual EPS growth of 41%, compound, over the last three years? That sort of growth never lasts long, but like a shooting star it is well worth watching when it happens.

I like to see top-line growth as an indication that growth is sustainable, and I look for a high earnings before interest and taxation (EBIT) margin to point to a competitive moat (though some companies with low margins also have moats). Ducommun maintained stable EBIT margins over the last year, all while growing revenue 15% to US$698m. That's progress.

The chart below shows how the company's bottom and top lines have progressed over time. Click on the chart to see the exact numbers.

The trick, as an investor, is to find companies that are going to perform well in the future, not just in the past. To that end, right now and today, you can check our visualization of consensus analyst forecasts for future Ducommun EPS 100% free.

Are Ducommun 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 Ducommun shares worth a considerable sum. To be specific, they have US$47m worth of shares. That's a lot of money, and no small incentive to work hard. That amounts to 8.3% of the company, demonstrating a degree of high-level alignment with shareholders.

Is Ducommun Worth Keeping An Eye On?

Ducommun's earnings per share have taken off like a rocket aimed right at the moon. That EPS growth certainly has my attention, and the large insider ownership only serves to further stoke my interest. The hope is, of course, that the strong growth marks a fundamental improvement in the business economics. So to my mind Ducommun is worth putting on your watchlist; after all, shareholders do well when the market underestimates fast growing companies. Once you've identified a business you like, the next step is to consider what you think it's worth. And right now is your chance to view our exclusive discounted cashflow valuation of Ducommun. You might benefit from giving it a glance today.

You can invest in any company you want. But if you prefer to focus on stocks that have demonstrated insider buying, here is a list of companies with insider buying in the last three months.

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

If you spot an error that warrants correction, please contact the editor at editorial-team@simplywallst.com. 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. Simply Wall St has no position in the stocks mentioned.

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