For many, the main point of investing is to generate higher returns than the overall market. But every investor is virtually certain to have both over-performing and under-performing stocks. At this point some shareholders may be questioning their investment in Plantronics, Inc. (NYSE:POLY), since the last five years saw the share price fall 52%. And we doubt long term believers are the only worried holders, since the stock price has declined 37% over the last twelve months.

Since shareholders are down over the longer term, lets look at the underlying fundamentals over the that time and see if they've been consistent with returns.

See our latest analysis for Plantronics

While the efficient markets hypothesis continues to be taught by some, it has been proven that markets are over-reactive dynamic systems, and investors are not always rational. 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.

During five years of share price growth, Plantronics moved from a loss to profitability. That would generally be considered a positive, so we are surprised to see the share price is down. Other metrics may better explain the share price move.

In contrast to the share price, revenue has actually increased by 16% 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.

You can see below how earnings and revenue have changed over time (discover the exact values by clicking on the image).

We consider it positive that insiders have made significant purchases in the last year. Having said that, most people consider earnings and revenue growth trends to be a more meaningful guide to the business. You can see what analysts are predicting for Plantronics in this interactive graph of future profit estimates.

What about the Total Shareholder Return (TSR)?

Investors should note that there's a difference between Plantronics' total shareholder return (TSR) and its share price change, which we've covered above. The TSR attempts to capture the value of dividends (as if they were reinvested) as well as any spin-offs or discounted capital raisings offered to shareholders. Plantronics' TSR of was a loss of 50% for the 5 years. That wasn't as bad as its share price return, because it has paid dividends.

A Different Perspective

We regret to report that Plantronics shareholders are down 37% for the year. Unfortunately, that's worse than the broader market decline of 1.9%. Having said that, it's inevitable that some stocks will be oversold in a falling market. The key is to keep your eyes on the fundamental developments. 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. 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. For instance, we've identified 3 warning signs for Plantronics (1 is a bit unpleasant) that you should be aware of.