To the annoyance of some shareholders, Mun Siong Engineering Limited (SGX:MF6) shares are down a considerable 26% in the last month, which continues a horrid run for the company. Instead of being rewarded, shareholders who have already held through the last twelve months are now sitting on a 44% share price drop.

Although its price has dipped substantially, there still wouldn't be many who think Mun Siong Engineering's price-to-sales (or "P/S") ratio of 0.2x is worth a mention when the median P/S in Singapore's Construction industry is similar at about 0.4x. While this might not raise any eyebrows, if the P/S ratio is not justified investors could be missing out on a potential opportunity or ignoring looming disappointment.

How Has Mun Siong Engineering Performed Recently?

Mun Siong Engineering has been doing a decent job lately as it's been growing revenue at a reasonable pace. It might be that many expect the respectable revenue performance to only match most other companies over the coming period, which has kept the P/S from rising. Those who are bullish on Mun Siong Engineering will be hoping that this isn't the case, so that they can pick up the stock at a lower valuation.

We don't have analyst forecasts, but you can see how recent trends are setting up the company for the future by checking out our free report on Mun Siong Engineering's earnings, revenue and cash flow.

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

The only time you'd be comfortable seeing a P/S like Mun Siong Engineering's is when the company's growth is tracking the industry closely.

Retrospectively, the last year delivered a decent 2.5% gain to the company's revenues. Revenue has also lifted 23% in aggregate from three years ago, partly thanks to the last 12 months of growth. So we can start by confirming that the company has actually done a good job of growing revenue over that time.

Comparing that to the industry, which is predicted to deliver 12% growth in the next 12 months, the company's momentum is weaker, based on recent medium-term annualised revenue results.

With this information, we find it interesting that Mun Siong Engineering is trading at a fairly similar P/S compared to the industry. Apparently many investors in the company are less bearish than recent times would indicate and aren't willing to let go of their stock right now. Maintaining these prices will be difficult to achieve as a continuation of recent revenue trends is likely to weigh down the shares eventually.

What Does Mun Siong Engineering's P/S Mean For Investors?

With its share price dropping off a cliff, the P/S for Mun Siong Engineering looks to be in line with the rest of the Construction industry. 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 Mun Siong Engineering's average P/S is a bit surprising since its recent three-year growth is lower than the wider industry forecast. When we see weak revenue with slower than industry growth, we suspect the share price is at risk of declining, bringing the P/S back in line with expectations. If recent medium-term revenue trends continue, the probability of a share price decline will become quite substantial, placing shareholders at risk.

And what about other risks? Every company has them, and we've spotted 3 warning signs for Mun Siong Engineering (of which 2 are significant!) 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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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.