As an investor, mistakes are inevitable. But you have a problem if you face massive losses more than once in a while. So take a moment to sympathize with the long term shareholders of GrafTech International Ltd. (NYSE:EAF), who have seen the share price tank a massive 85% over a three year period. That would certainly shake our confidence in the decision to own the stock. Even worse, it's down 15% in about a month, which isn't fun at all. We really feel for shareholders in this scenario. It's a good reminder of the importance of diversification, and it's worth keeping in mind there's more to life than money, anyway.

Now let's have a look at the company's fundamentals, and see if the long term shareholder return has matched the performance of the underlying business.

View our latest analysis for GrafTech International

To paraphrase Benjamin Graham: Over the short term the market is a voting machine, but over the long term it's a weighing machine. 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 the three years that the share price declined, GrafTech International's earnings per share (EPS) dropped significantly, falling to a loss. Due to the loss, it's not easy to use EPS as a reliable guide to the business. But it's safe to say we'd generally expect the share price to be lower as a result!

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

It might be well worthwhile taking a look at our free report on GrafTech International's earnings, revenue and cash flow.

A Different Perspective

Investors in GrafTech International had a tough year, with a total loss of 15%, against a market gain of about 26%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. However, the loss over the last year isn't as bad as the 13% per annum loss investors have suffered over the last half decade. We'd need to see some sustained improvements in the key metrics before we could muster much enthusiasm. 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 3 warning signs for GrafTech International you should be aware of, and 2 of them are a bit unpleasant.

We will like GrafTech International better if we see some big insider buys. While we wait, check out this free list of undervalued stocks (mostly small caps) with considerable, recent, insider 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.