In order to justify the effort of selecting individual stocks, it's worth striving to beat the returns from a market index fund. But its virtually certain that sometimes you will buy stocks that fall short of the market average returns. Unfortunately, that's been the case for longer term Revvity, Inc. (NYSE:RVTY) shareholders, since the share price is down 22% in the last three years, falling well short of the market return of around 18%.

Since Revvity has shed US$608m from its value in the past 7 days, let's see if the longer term decline has been driven by the business' economics.

In his essay The Superinvestors of Graham-and-Doddsville Warren Buffett described how share prices do not always rationally reflect the value of a business. 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, Revvity's earnings per share (EPS) dropped by 46% each year. In comparison the 8% compound annual share price decline isn't as bad as the EPS drop-off. This suggests that the market retains some optimism around long term earnings stability, despite past EPS declines. This positive sentiment is also reflected in the generous P/E ratio of 72.91.

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

A Different Perspective

Revvity shareholders are down 5.7% for the year (even including dividends), but the market itself is up 23%. 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. Longer term investors wouldn't be so upset, since they would have made 3%, each year, over five years. If the fundamental data continues to indicate long term sustainable growth, the current sell-off could be an opportunity worth considering. 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. Case in point: We've spotted 2 warning signs for Revvity you should be aware of.

We will like Revvity 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.