The excitement of investing in a company that can reverse its fortunes is a big draw for some speculators, so even companies that have no revenue, no profit, and a record of falling short, can manage to find investors. But as Peter Lynch said in One Up On Wall Street, 'Long shots almost never pay off.' Loss-making companies are always racing against time to reach financial sustainability, so investors in these companies may be taking on more risk than they should.

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 Planet Fitness (NYSE:PLNT). While profit isn't the sole metric that should be considered when investing, it's worth recognising businesses that can consistently produce it.

Check out our latest analysis for Planet Fitness

How Fast Is Planet Fitness 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. That makes EPS growth an attractive quality for any company. To the delight of shareholders, Planet Fitness has achieved impressive annual EPS growth of 51%, compound, over the last three years. Growth that fast may well be fleeting, but it should be more than enough to pique the interest of the wary stock pickers.

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 Planet Fitness achieved similar EBIT margins to last year, revenue grew by a solid 4.9% to US$1.0b. That's a real positive.

The chart below shows how the company's bottom and top lines have progressed 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 Planet Fitness' future EPS 100% free.

Are Planet Fitness Insiders Aligned With All Shareholders?

Owing to the size of Planet Fitness, we wouldn't expect insiders to hold a significant proportion of the company. But thanks to their investment in the company, it's pleasing to see that there are still incentives to align their actions with the shareholders. To be specific, they have US$27m worth of shares. That shows significant buy-in, and may indicate conviction in the business strategy. Even though that's only about 0.3% of the company, it's enough money to indicate alignment between the leaders of the business and ordinary shareholders.

Is Planet Fitness Worth Keeping An Eye On?

Planet Fitness' earnings per share have been soaring, with growth rates sky high. This level of EPS growth does wonders for attracting investment, and the large insider investment in the company is just the cherry on top. The hope is, of course, that the strong growth marks a fundamental improvement in the business economics. So at the surface level, Planet Fitness is worth putting on your watchlist; after all, shareholders do well when the market underestimates fast growing companies. Before you take the next step you should know about the 2 warning signs for Planet Fitness that we have uncovered.

While opting for stocks without growing earnings and absent insider buying can yield results, for investors valuing these key metrics, here is a carefully selected list of companies in the US with promising growth potential and insider confidence.

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.