The three-year earnings decline is not helping Power Integrations' (NASDAQ:POWI share price, as stock falls another 6.2% in past week

As an investor its worth striving to ensure your overall portfolio beats the market average. But if you try your hand at stock picking, you risk returning less than the market. Unfortunately, that's been the case for longer term Power Integrations, Inc. (NASDAQ:POWI) shareholders, since the share price is down 28% in the last three years, falling well short of the market return of around 64%. And over the last year the share price fell 26%, so we doubt many shareholders are delighted. On top of that, the share price is down 6.2% in the last week.

If the past week is anything to go by, investor sentiment for Power Integrations isn't positive, so let's see if there's a mismatch between fundamentals and the share price.

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

Power Integrations saw its EPS decline at a compound rate of 39% per year, over the last three years. In comparison the 10% compound annual share price decline isn't as bad as the EPS drop-off. So the market may not be too worried about the EPS figure, at the moment -- or it may have previously priced some of the drop in. This positive sentiment is also reflected in the generous P/E ratio of 82.68.

The graphic below depicts how EPS has changed over time (unveil the exact values by clicking on the image).

Dive deeper into Power Integrations' key metrics by checking this interactive graph of Power Integrations's earnings, revenue and cash flow.

What About Dividends?

When looking at investment returns, it is important to consider the difference between total shareholder return (TSR) and share price return. The TSR is a return calculation that accounts for the value of cash dividends (assuming that any dividend received was reinvested) and the calculated value of any discounted capital raisings and spin-offs. So for companies that pay a generous dividend, the TSR is often a lot higher than the share price return. We note that for Power Integrations the TSR over the last 3 years was -25%, which is better than the share price return mentioned above. The dividends paid by the company have thusly boosted the total shareholder return.

A Different Perspective

Investors in Power Integrations had a tough year, with a total loss of 25% (including dividends), against a market gain of about 11%. 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 0.9% 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. 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. To that end, you should be aware of the 2 warning signs we've spotted with Power Integrations .

We will like Power Integrations better if we see some big insider buys. While we wait, check out this free list of undervalued stocks (mostly small caps) with considerable, recent, insider buying.

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.