In order to justify the effort of selecting individual stocks, it's worth striving to beat the returns from a market index fund. But if you try your hand at stock picking, you risk returning less than the market. We regret to report that long term Constellium SE (NYSE:CSTM) shareholders have had that experience, with the share price dropping 33% in three years, versus a market return of about 28%. And the ride hasn't got any smoother in recent times over the last year, with the price 32% lower in that time. Furthermore, it's down 28% in about a quarter. That's not much fun for holders.

It's worthwhile assessing if the company's economics have been moving in lockstep with these underwhelming shareholder returns, or if there is some disparity between the two. So let's do just that.

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 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, Constellium's earnings per share (EPS) dropped by 30% each year. This fall in the EPS is worse than the 12% compound annual share price fall. So the market may not be too worried about the EPS figure, at the moment -- or it may have previously priced some of the drop in.

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 Constellium's earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

A Different Perspective

While the broader market gained around 34% in the last year, Constellium shareholders lost 32%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Unfortunately, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 4% over the last half decade. We realise that Baron Rothschild has said investors should "buy when there is blood on the streets", but we caution that investors should first be sure they are buying a high quality business. While it is well worth considering the different impacts that market conditions can have on the share price, there are other factors that are even more important. Even so, be aware that Constellium is showing 2 warning signs in our investment analysis , and 1 of those can't be ignored...

Of course Constellium 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.