We're definitely into long term investing, but some companies are simply bad investments over any time frame. It hits us in the gut when we see fellow investors suffer a loss. For example, we sympathize with anyone who was caught holding PubMatic, Inc. (NASDAQ:PUBM) during the five years that saw its share price drop a whopping 80%. And some of the more recent buyers are probably worried, too, with the stock falling 48% in the last year. Even worse, it's down 14% in about a month, which isn't fun at all.

After losing 11% this past week, it's worth investigating the company's fundamentals to see what we can infer from past performance.

There is no denying that markets are sometimes efficient, but prices do not always reflect underlying business performance. One imperfect but simple way to consider how the market perception of a company has shifted is to compare the change in the earnings per share (EPS) with the share price movement.

Over five years PubMatic's earnings per share dropped significantly, falling to a loss, with the share price also lower. At present it's hard to make valid comparisons between EPS and the share price. But we would generally expect a lower price, given the situation.

The company's earnings per share (over time) is depicted in the image below (click to see the exact numbers).

A Different Perspective

PubMatic shareholders are down 48% for the year, but the market itself is up 17%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Regrettably, last year's performance caps off a bad run, with the shareholders facing a total loss of 12% per year over five years. 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. It's always interesting to track share price performance over the longer term. But to understand PubMatic better, we need to consider many other factors.

Of course PubMatic may not be the best stock to buy. So you may wish to see this free collection of growth stocks.

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.