The Seres Therapeutics, Inc. (NASDAQ:MCRB) share price has fared very poorly over the last month, falling by a substantial 30%. The recent drop completes a disastrous twelve months for shareholders, who are sitting on a 58% loss during that time.

Following the heavy fall in price, Seres Therapeutics' price-to-sales (or "P/S") ratio of 0.8x might make it look like a strong buy right now compared to the wider Biotechs industry in the United States, where around half of the companies have P/S ratios above 11.5x and even P/S above 68x are quite common. However, the P/S might be quite low for a reason and it requires further investigation to determine if it's justified.

What Does Seres Therapeutics' Recent Performance Look Like?

Seres Therapeutics could be doing better as its revenue has been going backwards lately while most other companies have been seeing positive revenue growth. It seems that many are expecting the poor revenue performance to persist, which has repressed the P/S ratio. If this is the case, then existing shareholders will probably struggle to get excited about the future direction of the share price.

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

Seres Therapeutics' P/S ratio would be typical for a company that's expected to deliver very poor growth or even falling revenue, and importantly, perform much worse than the industry.

Retrospectively, the last year delivered virtually the same number to the company's top line as the year before. This isn't what shareholders were looking for as it means they've been left with a 19% decline in revenue over the last three years in total. Accordingly, shareholders would have felt downbeat about the medium-term rates of revenue growth.

Looking ahead now, revenue is anticipated to slump, contracting by 6.6% each year during the coming three years according to the five analysts following the company. With the industry predicted to deliver 120% growth per year, that's a disappointing outcome.

With this information, we are not surprised that Seres Therapeutics is trading at a P/S lower than the industry. However, shrinking revenues are unlikely to lead to a stable P/S over the longer term. There's potential for the P/S to fall to even lower levels if the company doesn't improve its top-line growth.

What Does Seres Therapeutics' P/S Mean For Investors?

Shares in Seres Therapeutics have plummeted and its P/S has followed suit. Using the price-to-sales 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.

With revenue forecasts that are inferior to the rest of the industry, it's no surprise that Seres Therapeutics' P/S is on the lower end of the spectrum. At this stage investors feel the potential for an improvement in revenue isn't great enough to justify a higher P/S ratio. Unless these conditions improve, they will continue to form a barrier for the share price around these levels.

And what about other risks? Every company has them, and we've spotted 5 warning signs for Seres Therapeutics (of which 2 make us uncomfortable!) you should know about.

It's important to make sure you look for a great company, not just the first idea you come across. So if growing profitability aligns with your idea of a great company, take a peek at this free list of interesting companies with strong recent earnings growth (and a low P/E).

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