The most you can lose on any stock (assuming you don't use leverage) is 100% of your money. But when you pick a company that is really flourishing, you can make more than 100%. For instance, the price of West Pharmaceutical Services, Inc. (NYSE:WST) stock is up an impressive 121% over the last five years. Also pleasing for shareholders was the 12% gain in the last three months. But this move may well have been assisted by the reasonably buoyant market (up 6.0% in 90 days).

So let's assess the underlying fundamentals over the last 5 years and see if they've moved in lock-step with shareholder returns.

View our latest analysis for West Pharmaceutical Services

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 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).

During five years of share price growth, West Pharmaceutical Services achieved compound earnings per share (EPS) growth of 17% per year. This EPS growth is remarkably close to the 17% average annual increase in the share price. That suggests that the market sentiment around the company hasn't changed much over that time. Rather, the share price has approximately tracked EPS growth.

The image below shows how EPS has tracked over time (if you click on the image you can see greater detail).

Dive deeper into West Pharmaceutical Services' key metrics by checking this interactive graph of West Pharmaceutical Services's earnings, revenue and cash flow.

What About Dividends?

When looking at investment returns, it is important to consider the difference between total shareholder return (TSR) and share price return. The TSR is a return calculation that accounts for the value of cash dividends (assuming that any dividend received was reinvested) and the calculated value of any discounted capital raisings and spin-offs. Arguably, the TSR gives a more comprehensive picture of the return generated by a stock. We note that for West Pharmaceutical Services the TSR over the last 5 years was 124%, which is better than the share price return mentioned above. And there's no prize for guessing that the dividend payments largely explain the divergence!

A Different Perspective

While the broader market gained around 27% in the last year, West Pharmaceutical Services shareholders lost 4.3% (even including dividends). 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. On the bright side, long term shareholders have made money, with a gain of 17% per year over half a decade. It could be that the recent sell-off is an opportunity, so it may be worth checking the fundamental data for signs of a long term growth trend. Most investors take the time to check the data on insider transactions. You can click here to see if insiders have been buying or selling.

We will like West Pharmaceutical Services 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.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.

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.