Ingevity Corporation (NYSE:NGVT) shareholders should be happy to see the share price up 15% in the last quarter. But don't envy holders -- looking back over 5 years the returns have been really bad. In that time the share price has delivered a rude shock to holders, who find themselves down 50% after a long stretch. So we're hesitant to put much weight behind the short term increase. However, in the best case scenario (far from fait accompli), this improved performance might be sustained.

Given the past week has been tough on shareholders, let's investigate the fundamentals and see what we can learn.

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. 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.

In the last half decade Ingevity saw its share price fall as its EPS declined below zero. This was, in part, due to extraordinary items impacting earnings. At present it's hard to make valid comparisons between EPS and the share price. However, we can say we'd expect to see a falling share price in this scenario.

You can see how EPS has changed over time in the image below (click on the chart to see the exact values).

It's probably worth noting that the CEO is paid less than the median at similar sized companies. It's always worth keeping an eye on CEO pay, but a more important question is whether the company will grow earnings throughout the years.

A Different Perspective

Ingevity shareholders are down 2.8% for the year, but the market itself is up 29%. 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. Unfortunately, longer term shareholders are suffering worse, given the loss of 9% doled out over the last five years. We'd need to see some sustained improvements in the key metrics before we could muster much enthusiasm. It's always interesting to track share price performance over the longer term. But to understand Ingevity better, we need to consider many other factors. Consider for instance, the ever-present spectre of investment risk. We've identified 1 warning sign with Ingevity , and understanding them should be part of your investment process.

But note: Ingevity may not be the best stock to buy. So take a peek at this free list of interesting companies with past earnings growth (and further growth forecast).

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on American exchanges.

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.