When close to half the companies in the United States have price-to-earnings ratios (or "P/E's") above 18x, you may consider Costamare Inc. (NYSE:CMRE) as a highly attractive investment with its 4.8x P/E ratio. However, the P/E might be quite low for a reason and it requires further investigation to determine if it's justified.

Costamare has been struggling lately as its earnings have declined faster than most other companies. It seems that many are expecting the dismal earnings performance to persist, which has repressed the P/E. If you still like the company, you'd want its earnings trajectory to turn around before making any decisions. If not, then existing shareholders will probably struggle to get excited about the future direction of the share price.

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

In order to justify its P/E ratio, Costamare would need to produce anemic growth that's substantially trailing the market.

If we review the last year of earnings, dishearteningly the company's profits fell to the tune of 31%. However, a few very strong years before that means that it was still able to grow EPS by an impressive 90% in total over the last three years. 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.

Turning to the outlook, the next three years should bring diminished returns, with earnings decreasing 5.5% each year as estimated by the two analysts watching the company. Meanwhile, the broader market is forecast to expand by 10% per year, which paints a poor picture.

In light of this, it's understandable that Costamare's P/E would sit below the majority of other companies. Nonetheless, there's no guarantee the P/E has reached a floor yet with earnings going in reverse. There's potential for the P/E to fall to even lower levels if the company doesn't improve its profitability.

The Final Word

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 Costamare's analyst forecasts revealed that its outlook for shrinking earnings is contributing to its low P/E. Right now shareholders are accepting the low P/E as they concede future earnings probably won't provide any pleasant surprises. It's hard to see the share price rising strongly in the near future under these circumstances.

You should always think about risks. Case in point, we've spotted 4 warning signs for Costamare you should be aware of, and 1 of them doesn't sit too well with us.

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.