Shanghai Welltech Automation Co.,Ltd. (SZSE:002058) shares have had a really impressive month, gaining 26% after a shaky period beforehand. Unfortunately, the gains of the last month did little to right the losses of the last year with the stock still down 25% over that time.

After such a large jump in price, you could be forgiven for thinking Shanghai Welltech AutomationLtd is a stock to steer clear of with a price-to-sales ratios (or "P/S") of 7.9x, considering almost half the companies in China's Electronic industry have P/S ratios below 3.3x. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/S.

How Shanghai Welltech AutomationLtd Has Been Performing

For example, consider that Shanghai Welltech AutomationLtd's financial performance has been pretty ordinary lately as revenue growth is non-existent. 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. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Do Revenue Forecasts Match The High P/S Ratio?

There's an inherent assumption that a company should far outperform the industry for P/S ratios like Shanghai Welltech AutomationLtd's to be considered reasonable.

Retrospectively, the last year delivered virtually the same number to the company's top line as the year before. The lack of growth did nothing to help the company's aggregate three-year performance, which is an unsavory 32% drop in revenue. So unfortunately, we have to acknowledge that the company has not done a great job of growing revenue over that time.

Weighing that medium-term revenue trajectory against the broader industry's one-year forecast for expansion of 26% shows it's an unpleasant look.

With this in mind, we find it worrying that Shanghai Welltech AutomationLtd's P/S exceeds that of its industry peers. Apparently many investors in the company are way more bullish than recent times would indicate and aren't willing to let go of their stock at any price. There's a very good chance existing shareholders are setting themselves up for future disappointment if the P/S falls to levels more in line with the recent negative growth rates.

What We Can Learn From Shanghai Welltech AutomationLtd's P/S?

Shares in Shanghai Welltech AutomationLtd have seen a strong upwards swing lately, which has really helped boost its P/S figure. We'd say the price-to-sales ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

We've established that Shanghai Welltech AutomationLtd currently trades on a much higher than expected P/S since its recent revenues have been in decline over the medium-term. When we see revenue heading backwards and underperforming the industry forecasts, we feel the possibility of the share price declining is very real, bringing the P/S back into the realm of reasonability. Unless the recent medium-term conditions improve markedly, investors will have a hard time accepting the share price as fair value.

Before you take the next step, you should know about the 2 warning signs for Shanghai Welltech AutomationLtd (1 is a bit unpleasant!) that we have uncovered.

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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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.