Even the best stock pickers will make plenty of bad investments. Anyone who held Ultra Clean Holdings, Inc. (NASDAQ:UCTT) over the last year knows what a loser feels like. In that relatively short period, the share price has plunged 54%. To make matters worse, the returns over three years have also been really disappointing (the share price is 45% lower than three years ago). Furthermore, it's down 42% in about a quarter. That's not much fun for holders.

Since Ultra Clean Holdings has shed US$158m from its value in the past 7 days, let's see if the longer term decline has been driven by the business' economics.

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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.

During the last year Ultra Clean Holdings grew its earnings per share, moving from a loss to a profit.

When a company has just transitioned to profitability, earnings per share growth is not always the best way to look at the share price action. So it makes sense to check out some other factors.

Ultra Clean Holdings managed to grow revenue over the last year, which is usually a real positive. Since the fundamental metrics don't readily explain the share price drop, there might be an opportunity if the market has overreacted.

The image below shows how earnings and revenue have tracked over time (if you click on the image you can see greater detail).

It's good to see that there was some significant insider buying in the last three months. That's a positive. That said, we think earnings and revenue growth trends are even more important factors to consider. If you are thinking of buying or selling Ultra Clean Holdings stock, you should check out this free report showing analyst profit forecasts.

A Different Perspective

Investors in Ultra Clean Holdings had a tough year, with a total loss of 54%, against a market gain of about 9.1%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Longer term investors wouldn't be so upset, since they would have made 6%, each year, over five years. If the fundamental data continues to indicate long term sustainable growth, the current sell-off could be an opportunity worth considering. 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. Case in point: We've spotted 2 warning signs for Ultra Clean Holdings you should be aware of.

Ultra Clean Holdings is not the only stock insiders are buying. So take a peek at this free list of small cap companies at attractive valuations which insiders have been 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.