SEP Analytical (Shanghai) Co., Ltd. (SZSE:301228) shares have continued their recent momentum with a 31% gain in the last month alone. Unfortunately, the gains of the last month did little to right the losses of the last year with the stock still down 30% over that time.

Since its price has surged higher, when almost half of the companies in China's Professional Services industry have price-to-sales ratios (or "P/S") below 2.9x, you may consider SEP Analytical (Shanghai) as a stock probably not worth researching with its 4x P/S ratio. Although, it's not wise to just take the P/S at face value as there may be an explanation why it's as high as it is.

What Does SEP Analytical (Shanghai)'s Recent Performance Look Like?

We'd have to say that with no tangible growth over the last year, SEP Analytical (Shanghai)'s revenue has been unimpressive. One possibility is that the P/S is high because investors think the benign revenue growth will improve to outperform the broader industry in the near future. If not, then existing shareholders may be a little nervous about the viability of the share price.

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

SEP Analytical (Shanghai)'s P/S ratio would be typical for a company that's expected to deliver solid growth, and importantly, perform better than the industry.

Taking a look back first, we see that there was hardly any revenue growth to speak of for the company over the past year. Whilst it's an improvement, it wasn't enough to get the company out of the hole it was in, with revenue down 5.9% overall from three years ago. So unfortunately, we have to acknowledge that the company has not done a great job of growing revenue over that time.

In contrast to the company, the rest of the industry is expected to grow by 32% over the next year, which really puts the company's recent medium-term revenue decline into perspective.

With this in mind, we find it worrying that SEP Analytical (Shanghai)'s P/S exceeds that of its industry peers. It seems most investors are ignoring the recent poor growth rate and are hoping for a turnaround in the company's business prospects. Only the boldest would assume these prices are sustainable as a continuation of recent revenue trends is likely to weigh heavily on the share price eventually.

What We Can Learn From SEP Analytical (Shanghai)'s P/S?

SEP Analytical (Shanghai)'s P/S is on the rise since its shares have risen strongly. While the price-to-sales ratio shouldn't be the defining factor in whether you buy a stock or not, it's quite a capable barometer of revenue expectations.

We've established that SEP Analytical (Shanghai) currently trades on a much higher than expected P/S since its recent revenues have been in decline over the medium-term. Right now we aren't comfortable with the high P/S as this revenue performance is highly unlikely to support such positive sentiment for long. Unless the the circumstances surrounding the recent medium-term improve, it wouldn't be wrong to expect a a difficult period ahead for the company's shareholders.

It's always necessary to consider the ever-present spectre of investment risk. We've identified 2 warning signs with SEP Analytical (Shanghai), and understanding these should be part of your investment process.

If these risks are making you reconsider your opinion on SEP Analytical (Shanghai), explore our interactive list of high quality stocks to get an idea of what else is out there.

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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.