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 the reality is that when a company loses money each year, for long enough, its investors will usually take their share of those losses.

In the age of tech-stock blue-sky investing, my choice may seem old fashioned; I still prefer profitable companies like Preformed Line Products (NASDAQ:PLPC). While that doesn't make the shares worth buying at any price, you can't deny that successful capitalism requires profit, eventually. Loss-making companies are always racing against time to reach financial sustainability, but time is often a friend of the profitable company, especially if it is growing.

View our latest analysis for Preformed Line Products

How Quickly Is Preformed Line Products Increasing Earnings Per Share?

If a company can keep growing earnings per share (EPS) long enough, its share price will eventually follow. That means EPS growth is considered a real positive by most successful long-term investors. Impressively, Preformed Line Products has grown EPS by 27% per year, compound, in the last three years. If the company can sustain that sort of growth, we'd expect shareholders to come away winners.

I like to take a look at earnings before interest and (EBIT) tax margins, as well as revenue growth, to get another take on the quality of the company's growth. Preformed Line Products maintained stable EBIT margins over the last year, all while growing revenue 6.8% to US$481m. That's progress.

You can take a look at the company's revenue and earnings growth trend, in the chart below. Click on the chart to see the exact numbers.

While it's always good to see growing profits, you should always remember that a weak balance sheet could come back to bite. So check Preformed Line Products's balance sheet strength, before getting too excited.

Are Preformed Line Products Insiders Aligned With All Shareholders?

Like the kids in the streets standing up for their beliefs, insider share purchases give me reason to believe in a brighter future. This view is based on the possibility that stock purchases signal bullishness on behalf of the buyer. However, small purchases are not always indicative of conviction, and insiders don't always get it right.

In the last twelve months Preformed Line Products insiders spent US$8.0k on stock; good news for shareholders. This might not be a huge sum, but it's well worth noting anyway, given the complete lack of selling.

And the insider buying isn't the only sign of alignment between shareholders and the board, since Preformed Line Products insiders own more than a third of the company. Actually, with 39% of the company to their names, insiders are profoundly invested in the business. I'm reassured by this kind of alignment, as it suggests the business will be run for the benefit of shareholders. In terms of absolute value, insiders have US$142m invested in the business, using the current share price. That's nothing to sneeze at!

Should You Add Preformed Line Products To Your Watchlist?

You can't deny that Preformed Line Products has grown its earnings per share at a very impressive rate. That's attractive. On top of that, insiders own a significant stake in the company and have been buying more shares. So it's fair to say I think this stock may well deserve a spot on your watchlist. Now, you could try to make up your mind on Preformed Line Products by focusing on just these factors, or you could also consider how its price-to-earnings ratio compares to other companies in its industry.

The good news is that Preformed Line Products is not the only growth stock with insider buying. Here's a list of them... 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.

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.

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