The SIGA Technologies, Inc. (NASDAQ:SIGA) share price has softened a substantial 34% over the previous 30 days, handing back much of the gains the stock has made lately. Looking at the bigger picture, even after this poor month the stock is up 73% in the last year.

Even after such a large drop in price, SIGA Technologies may still be sending very bullish signals at the moment with its price-to-earnings (or "P/E") ratio of 6.7x, since almost half of all companies in the United States have P/E ratios greater than 18x and even P/E's higher than 33x are not unusual. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's so limited.

With its earnings growth in positive territory compared to the declining earnings of most other companies, SIGA Technologies has been doing quite well of late. It might be that many expect the strong earnings performance to degrade substantially, possibly more than the market, which has repressed the P/E. 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 out of favour.

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

The only time you'd be truly comfortable seeing a P/E as depressed as SIGA Technologies' is when the company's growth is on track to lag the market decidedly.

If we review the last year of earnings growth, the company posted a terrific increase of 200%. The strong recent performance means it was also able to grow EPS by 107% in total over the last three years. So we can start by confirming that the company has done a great job of growing earnings over that time.

Turning to the outlook, the next year should bring diminished returns, with earnings decreasing 4.4% as estimated by the one analyst watching the company. That's not great when the rest of the market is expected to grow by 15%.

In light of this, it's understandable that SIGA Technologies' 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.

What We Can Learn From SIGA Technologies' P/E?

Shares in SIGA Technologies have plummeted and its P/E is now low enough to touch the ground. Using the price-to-earnings ratio alone to determine if you should sell your stock isn't sensible, however it can be a practical guide to the company's future prospects.

As we suspected, our examination of SIGA Technologies' 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.

And what about other risks? Every company has them, and we've spotted 3 warning signs for SIGA Technologies (of which 1 can't be ignored!) you should know about.

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.