Enphase Energy, Inc. (NASDAQ:ENPH) shareholders might understandably be very concerned that the share price has dropped 46% in the last quarter. But that scarcely detracts from the really solid long term returns generated by the company over five years. It's fair to say most would be happy with 203% the gain in that time. Generally speaking the long term returns will give you a better idea of business quality than short periods can. Of course, that doesn't necessarily mean it's cheap now. While the returns over the last 5 years have been good, we do feel sorry for those shareholders who haven't held shares that long, because the share price is down 73% in the last three years.

On the back of a solid 7-day performance, let's check what role the company's fundamentals have played in driving long term shareholder returns.

In his essay The Superinvestors of Graham-and-Doddsville Warren Buffett described how share prices do not always rationally reflect the value of a business. One way to examine how market sentiment has changed over time is to look at the interaction between a company's share price and its earnings per share (EPS).

Over half a decade, Enphase Energy managed to grow its earnings per share at 2.5% a year. This EPS growth is lower than the 25% average annual increase in the share price. So it's fair to assume the market has a higher opinion of the business than it did five years ago. That's not necessarily surprising considering the five-year track record of earnings growth. This favorable sentiment is reflected in its (fairly optimistic) P/E ratio of 145.83.

The company's earnings per share (over time) is depicted in the image below (click to see the exact numbers).

It's good to see that there was some significant insider buying in the last three months. That's a positive. On the other hand, we think the revenue and earnings trends are much more meaningful measures of the business. This free interactive report on Enphase Energy's earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

A Different Perspective

While the broader market gained around 34% in the last year, Enphase Energy shareholders lost 34%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Longer term investors wouldn't be so upset, since they would have made 25%, each year, over five years. It could be that the recent sell-off is an opportunity, so it may be worth checking the fundamental data for signs of a long term growth trend. I find it very interesting to look at share price over the long term as a proxy for business performance. But to truly gain insight, we need to consider other information, too. Consider risks, for instance. Every company has them, and we've spotted 2 warning signs for Enphase Energy you should know about.

Enphase Energy is not the only stock that insiders are buying. For those who like to find lesser know companies this free list of growing companies with recent insider purchasing, could be just the ticket.

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on American exchanges.

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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.