Tetra Tech, Inc.'s (NASDAQ:TTEK) price-to-earnings (or "P/E") ratio of 32.9x might make it look like a strong sell right now compared to the market in the United States, where around half of the companies have P/E ratios below 19x and even P/E's below 11x are quite common. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's so lofty.

With earnings growth that's superior to most other companies of late, Tetra Tech has been doing relatively well. The P/E is probably high because investors think this strong earnings performance will continue. If not, then existing shareholders might be a little nervous about the viability of the share price.

Does Growth Match The High P/E?

There's an inherent assumption that a company should far outperform the market for P/E ratios like Tetra Tech's to be considered reasonable.

If we review the last year of earnings growth, the company posted a terrific increase of 21%. The latest three year period has also seen an excellent 45% overall rise in EPS, aided by its short-term performance. Accordingly, shareholders would have probably welcomed those medium-term rates of earnings growth.

Shifting to the future, estimates from the seven analysts covering the company suggest earnings should grow by 17% each year over the next three years. With the market only predicted to deliver 11% per annum, the company is positioned for a stronger earnings result.

With this information, we can see why Tetra Tech is trading at such a high P/E compared to the market. It seems most investors are expecting this strong future growth and are willing to pay more for the stock.

What We Can Learn From Tetra Tech's P/E?

Typically, we'd caution against reading too much into price-to-earnings ratios when settling on investment decisions, though it can reveal plenty about what other market participants think about the company.

As we suspected, our examination of Tetra Tech's analyst forecasts revealed that its superior earnings outlook is contributing to its high P/E. At this stage investors feel the potential for a deterioration in earnings isn't great enough to justify a lower P/E ratio. It's hard to see the share price falling strongly in the near future under these circumstances.

Having said that, be aware Tetra Tech is showing 1 warning sign in our investment analysis, you should know about.

You might be able to find a better investment than Tetra Tech. If you want a selection of possible candidates, check out this free list of interesting companies that trade on a low P/E (but have proven they can grow earnings).

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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.