With a median price-to-earnings (or "P/E") ratio of close to 18x in the United States, you could be forgiven for feeling indifferent about Kirby Corporation's (NYSE:KEX) P/E ratio of 20.1x. While this might not raise any eyebrows, if the P/E ratio is not justified investors could be missing out on a potential opportunity or ignoring looming disappointment.

Recent times have been advantageous for Kirby as its earnings have been rising faster than most other companies. One possibility is that the P/E is moderate because investors think this strong earnings performance might be about to tail off. If you like the company, you'd be hoping this isn't the case so that you could potentially pick up some stock while it's not quite in favour.

What Are Growth Metrics Telling Us About The P/E?

In order to justify its P/E ratio, Kirby would need to produce growth that's similar to the market.

Retrospectively, the last year delivered an exceptional 58% gain to the company's bottom line. Still, EPS has barely risen at all from three years ago in total, which is not ideal. So it appears to us that the company has had a mixed result in terms of growing earnings over that time.

Turning to the outlook, the next year should generate growth of 23% as estimated by the five analysts watching the company. Meanwhile, the rest of the market is forecast to only expand by 15%, which is noticeably less attractive.

In light of this, it's curious that Kirby's P/E sits in line with the majority of other companies. It may be that most investors aren't convinced the company can achieve future growth expectations.

The Key Takeaway

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.

Our examination of Kirby's analyst forecasts revealed that its superior earnings outlook isn't contributing to its P/E as much as we would have predicted. There could be some unobserved threats to earnings preventing the P/E ratio from matching the positive outlook. At least the risk of a price drop looks to be subdued, but investors seem to think future earnings could see some volatility.

Before you take the next step, you should know about the 1 warning sign for Kirby that we have uncovered.

Of course, you might find a fantastic investment by looking at a few good candidates. So take a peek at this free list of companies with a strong growth track record, trading on a low P/E.

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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.