Generally speaking long term investing is the way to go. But no-one is immune from buying too high. For example, after five long years the Ingevity Corporation (NYSE:NGVT) share price is a whole 50% lower. That's not a lot of fun for true believers. And it's not just long term holders hurting, because the stock is down 32% in the last year. The falls have accelerated recently, with the share price down 28% in the last three months.

Since Ingevity has shed US$194m from its value in the past 7 days, let's see if the longer term decline has been driven by the business' economics.

View our latest analysis for Ingevity

To quote Buffett, 'Ships will sail around the world but the Flat Earth Society will flourish. There will continue to be wide discrepancies between price and value in the marketplace...' 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.

During the unfortunate half decade during which the share price slipped, Ingevity actually saw its earnings per share (EPS) improve by 6.1% per year. So it doesn't seem like EPS is a great guide to understanding how the market is valuing the stock. Or possibly, the market was previously very optimistic, so the stock has disappointed, despite improving EPS.

Because of the sharp contrast between the EPS growth rate and the share price growth, we're inclined to look to other metrics to understand the changing market sentiment around the stock.

In contrast to the share price, revenue has actually increased by 9.0% a year in the five year period. So it seems one might have to take closer look at the fundamentals to understand why the share price languishes. After all, there may be an opportunity.

The graphic below depicts how earnings and revenue have changed over time (unveil the exact values by clicking on the image).

We know that Ingevity has improved its bottom line lately, but what does the future have in store? So we recommend checking out this free report showing consensus forecasts

A Different Perspective

Investors in Ingevity had a tough year, with a total loss of 32%, against a market gain of about 18%. 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. Regrettably, last year's performance caps off a bad run, with the shareholders facing a total loss of 8% per year over five years. Generally speaking long term share price weakness can be a bad sign, though contrarian investors might want to research the stock in hope of a turnaround. 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 Ingevity , 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.