Sunmoon Food Company Limited (SGX:AAJ) shares have had a really impressive month, gaining 27% after a shaky period beforehand. Longer-term shareholders would be thankful for the recovery in the share price since it's now virtually flat for the year after the recent bounce.

In spite of the firm bounce in price, you could still be forgiven for feeling indifferent about Sunmoon Food's P/S ratio of 0.6x, since the median price-to-sales (or "P/S") ratio for the Consumer Retailing industry in Singapore is also close to 0.4x. However, investors might be overlooking a clear opportunity or potential setback if there is no rational basis for the P/S.

What Does Sunmoon Food's P/S Mean For Shareholders?

For instance, Sunmoon Food's receding revenue in recent times would have to be some food for thought. It might be that many expect the company to put the disappointing revenue performance behind them over the coming period, which has kept the P/S from falling. If not, then existing shareholders may be a little nervous about the viability of the share price.

Do Revenue Forecasts Match The P/S Ratio?

In order to justify its P/S ratio, Sunmoon Food would need to produce growth that's similar to the industry.

Retrospectively, the last year delivered a frustrating 36% decrease to the company's top line. As a result, revenue from three years ago have also fallen 18% overall. Accordingly, shareholders would have felt downbeat about the medium-term rates of revenue growth.

Weighing that medium-term revenue trajectory against the broader industry's one-year forecast for expansion of 10% shows it's an unpleasant look.

With this in mind, we find it worrying that Sunmoon Food'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. There's a 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 Sunmoon Food's P/S?

Its shares have lifted substantially and now Sunmoon Food's P/S is back within range of the industry median. Generally, our preference is to limit the use of the price-to-sales ratio to establishing what the market thinks about the overall health of a company.

We find it unexpected that Sunmoon Food trades at a P/S ratio that is comparable to the rest of the industry, despite experiencing declining revenues during the medium-term, while the industry as a whole is expected to grow. When we see revenue heading backwards in the context of growing industry forecasts, it'd make sense to expect a possible share price decline on the horizon, sending the moderate P/S lower. Unless the recent medium-term conditions improve markedly, investors will have a hard time accepting the share price as fair value.

It's always necessary to consider the ever-present spectre of investment risk. We've identified 3 warning signs with Sunmoon Food (at least 1 which is significant), and understanding them should be part of your investment process.

If companies with solid past earnings growth is up your alley, you may wish to see this free collection of other companies with strong earnings growth and low P/E ratios.

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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.