Long term investing can be life changing when you buy and hold the truly great businesses. While not every stock performs well, when investors win, they can win big. Don't believe it? Then look at the Hudson Technologies, Inc. (NASDAQ:HDSN) share price. It's 575% higher than it was five years ago. If that doesn't get you thinking about long term investing, we don't know what will. But it's down 8.6% in the last week. However, this might be related to the overall market decline of 4.0% in a week. It really delights us to see such great share price performance for investors.

So let's assess the underlying fundamentals over the last 5 years and see if they've moved in lock-step with shareholder returns.

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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. By comparing earnings per share (EPS) and share price changes over time, we can get a feel for how investor attitudes to a company have morphed over time.

During the five years of share price growth, Hudson Technologies moved from a loss to profitability. Sometimes, the start of profitability is a major inflection point that can signal fast earnings growth to come, which in turn justifies very strong share price gains.

You can see how EPS has changed over time in the image below (click on the chart to see the exact values).

This free interactive report on Hudson Technologies' earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

A Different Perspective

Investors in Hudson Technologies had a tough year, with a total loss of 46%, against a market gain of about 6.2%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. On the bright side, long term shareholders have made money, with a gain of 47% per year over half a decade. 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. Case in point: We've spotted 1 warning sign for Hudson Technologies you should be aware of.

Of course Hudson Technologies may not be the best stock to buy. So you may wish to see this free collection of growth stocks.

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.