The truth is that if you invest for long enough, you're going to end up with some losing stocks. But the last three years have been particularly tough on longer term Gentherm Incorporated (NASDAQ:THRM) shareholders. Regrettably, they have had to cope with a 60% drop in the share price over that period. And the ride hasn't got any smoother in recent times over the last year, with the price 48% lower in that time. Shareholders have had an even rougher run lately, with the share price down 12% in the last 90 days.

The recent uptick of 7.0% could be a positive sign of things to come, so let's take a look at historical fundamentals.

While the efficient markets hypothesis continues to be taught by some, it has been proven that markets are over-reactive dynamic systems, and investors are not always rational. 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 the three years that the share price fell, Gentherm's earnings per share (EPS) dropped by 9.4% each year. The share price decline of 26% is actually steeper than the EPS slippage. So it seems the market was too confident about the business, in the past.

The graphic below depicts how EPS has changed over time (unveil the exact values by clicking on the image).

It's probably worth noting we've seen significant insider buying in the last quarter, which we consider a positive. That said, we think earnings and revenue growth trends are even more important factors to consider. Dive deeper into the earnings by checking this interactive graph of Gentherm's earnings, revenue and cash flow.

A Different Perspective

While the broader market gained around 14% in the last year, Gentherm shareholders lost 48%. 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. Unfortunately, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 6% over the last half decade. Generally speaking long term share price weakness can be a bad sign, though contrarian investors might want to research the stock in hope of a turnaround. It is all well and good that insiders have been buying shares, but we suggest you check here to see what price insiders were buying at.

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.

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.