Cactus, Inc. (NYSE:WHD) shareholders would be excited to see that the share price has had a great month, posting a 28% gain and recovering from prior weakness. Not all shareholders will be feeling jubilant, since the share price is still down a very disappointing 36% in the last twelve months.

Although its price has surged higher, you could still be forgiven for feeling indifferent about Cactus' P/E ratio of 17.1x, since the median price-to-earnings (or "P/E") ratio in the United States is also close to 18x. Although, it's not wise to simply ignore the P/E without explanation as investors may be disregarding a distinct opportunity or a costly mistake.

Cactus could be doing better as its earnings have been going backwards lately while most other companies have been seeing positive earnings growth. One possibility is that the P/E is moderate because investors think this poor earnings performance will turn around. If not, then existing shareholders may be a little nervous about the viability of the share price.

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How Is Cactus' Growth Trending?

There's an inherent assumption that a company should be matching the market for P/E ratios like Cactus' to be considered reasonable.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 11%. Even so, admirably EPS has lifted 60% in aggregate from three years ago, notwithstanding the last 12 months. Although it's been a bumpy ride, it's still fair to say the earnings growth recently has been more than adequate for the company.

Looking ahead now, EPS is anticipated to climb by 22% during the coming year according to the five analysts following the company. That's shaping up to be materially higher than the 16% growth forecast for the broader market.

With this information, we find it interesting that Cactus is trading at a fairly similar P/E to the market. It may be that most investors aren't convinced the company can achieve future growth expectations.

What We Can Learn From Cactus' P/E?

Cactus' stock has a lot of momentum behind it lately, which has brought its P/E level with the market. We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

We've established that Cactus currently trades on a lower than expected P/E since its forecast growth is higher than the wider market. There could be some unobserved threats to earnings preventing the P/E ratio from matching the positive outlook. It appears some are indeed anticipating earnings instability, because these conditions should normally provide a boost to the share price.

You might be able to find a better investment than Cactus.

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.