While it may not be enough for some shareholders, we think it is good to see the IPG Photonics Corporation (NASDAQ:IPGP) share price up 11% in a single quarter. Meanwhile over the last three years the stock has dropped hard. In that time, the share price dropped 54%. So it's good to see it climbing back up. After all, could be that the fall was overdone.

So let's have a look and see if the longer term performance of the company has been in line with the underlying business' progress.

To paraphrase Benjamin Graham: Over the short term the market is a voting machine, but over the long term it's a weighing machine. 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.

IPG Photonics saw its share price decline over the three years in which its EPS also dropped, falling to a loss. Extraordinary items contributed to this situation. Since the company has fallen to a loss making position, it's hard to compare the change in EPS with the share price change. However, we can say we'd expect to see a falling share price in this scenario.

You can see below how EPS has changed over time (discover the exact values by clicking on the image).

This free interactive report on IPG Photonics' earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

A Different Perspective

IPG Photonics shareholders are down 30% for the year, but the market itself is up 28%. 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, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 8% over the last half decade. We realise that Baron Rothschild has said investors should "buy when there is blood on the streets", but we caution that investors should first be sure they are buying a high quality business. 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.

Of course, you might find a fantastic investment by looking elsewhere. So take a peek at this free list of companies we expect will 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.