One simple way to benefit from the stock market is to buy an index fund. But many of us dare to dream of bigger returns, and build a portfolio ourselves. For example, the Thermon Group Holdings, Inc. (NYSE:THR) share price is up 56% in the last three years, clearly besting the market return of around 10% (not including dividends). However, more recent returns haven't been as impressive as that, with the stock returning just 32% in the last year.

Although Thermon Group Holdings has shed US$81m from its market cap this week, let's take a look at its longer term fundamental trends and see if they've driven 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 flawed but reasonable way to assess how sentiment around a company has changed is to compare the earnings per share (EPS) with the share price.

During three years of share price growth, Thermon Group Holdings moved from a loss to profitability. That would generally be considered a positive, so we'd expect the share price to be up.

You can see below how EPS has changed over time (discover the exact values by clicking on the image).

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. Dive deeper into the earnings by checking this interactive graph of Thermon Group Holdings' earnings, revenue and cash flow.

A Different Perspective

We're pleased to report that Thermon Group Holdings shareholders have received a total shareholder return of 32% over one year. That's better than the annualised return of 3% over half a decade, implying that the company is doing better recently. Given the share price momentum remains strong, it might be worth taking a closer look at the stock, lest you miss an opportunity. 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. Take risks, for example - Thermon Group Holdings has 1 warning sign we think you should be aware of.

There are plenty of other companies that have insiders buying up shares. You probably do not want to miss this free list of growing companies that insiders are buying.

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.