In order to justify the effort of selecting individual stocks, it's worth striving to beat the returns from a market index fund. But in any portfolio, there are likely to be some stocks that fall short of that benchmark. Unfortunately, that's been the case for longer term Avantor, Inc. (NYSE:AVTR) shareholders, since the share price is down 45% in the last three years, falling well short of the market return of around 30%. Furthermore, it's down 18% in about a quarter. That's not much fun for holders.

While the stock has risen 4.5% in the past week but long term shareholders are still in the red, let's see what the fundamentals can tell us.

There is no denying that markets are sometimes efficient, but prices do not always reflect underlying business performance. By comparing earnings per share (EPS) and share price changes over time, we can get a feel for how investor attitudes to a company have morphed over time.

Avantor saw its EPS decline at a compound rate of 17% per year, over the last three years. This fall in EPS isn't far from the rate of share price decline, which was 18% per year. So it seems that investor expectations of the company are staying pretty steady, despite the disappointment. Rather, the share price has approximately tracked EPS growth.

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

Before buying or selling a stock, we always recommend a close examination of historic growth trends, available here.

A Different Perspective

Avantor shareholders gained a total return of 0.9% during the year. Unfortunately this falls short of the market return. It's probably a good sign that the company has an even better long term track record, having provided shareholders with an annual TSR of 4% over five years. Maybe the share price is just taking a breather while the business executes on its growth strategy. 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. Consider for instance, the ever-present spectre of investment risk. We've identified 1 warning sign with Avantor , and understanding them should be part of your investment process.

If you would prefer to check out another company -- one with potentially superior financials -- then do not miss this free list of companies that have proven they can grow earnings.

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.