By buying an index fund, investors can approximate the average market return. But many of us dare to dream of bigger returns, and build a portfolio ourselves. For example, Thermon Group Holdings, Inc. (NYSE:THR) shareholders have seen the share price rise 74% over three years, well in excess of the market return (17%, not including dividends).

Although Thermon Group Holdings has shed US$99m from its market cap this week, let's take a look at its longer term fundamental trends and see if they've driven returns.

While markets are a powerful pricing mechanism, share prices reflect investor sentiment, not just underlying business performance. One imperfect but simple way to consider how the market perception of a company has shifted is to compare the change in the earnings per share (EPS) with the share price movement.

Thermon Group Holdings was able to grow its EPS at 102% per year over three years, sending the share price higher. The average annual share price increase of 20% is actually lower than the EPS growth. So one could reasonably conclude that the market has cooled on the stock.

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

We consider it positive that insiders have made significant purchases in the last year. Having said that, most people consider earnings and revenue growth trends to be a more meaningful guide to the business. This free interactive report on Thermon Group Holdings' earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

A Different Perspective

Thermon Group Holdings shareholders are down 7.2% for the year, but the market itself is up 26%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. On the bright side, long term shareholders have made money, with a gain of 1.7% per year over half a decade. If the fundamental data continues to indicate long term sustainable growth, the current sell-off could be an opportunity worth considering. Investors who like to make money usually check up on insider purchases, such as the price paid, and total amount bought. You can find out about the insider purchases of Thermon Group Holdings by clicking this link.

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