The Guandian Defense Technology Co.,Ltd. (SHSE:688287) share price has softened a substantial 27% over the previous 30 days, handing back much of the gains the stock has made lately. The drop over the last 30 days has capped off a tough year for shareholders, with the share price down 48% in that time.

Even after such a large drop in price, when almost half of the companies in China's Aerospace & Defense industry have price-to-sales ratios (or "P/S") below 7.7x, you may still consider Guandian Defense TechnologyLtd as a stock not worth researching with its 16.2x P/S ratio. However, the P/S might be quite high for a reason and it requires further investigation to determine if it's justified.

What Does Guandian Defense TechnologyLtd's Recent Performance Look Like?

For instance, Guandian Defense TechnologyLtd's receding revenue in recent times would have to be some food for thought. It might be that many expect the company to still outplay most other companies over the coming period, which has kept the P/S from collapsing. If not, then existing shareholders may be quite nervous about the viability of the share price.

Do Revenue Forecasts Match The High P/S Ratio?

The only time you'd be truly comfortable seeing a P/S as steep as Guandian Defense TechnologyLtd's is when the company's growth is on track to outshine the industry decidedly.

In reviewing the last year of financials, we were disheartened to see the company's revenues fell to the tune of 52%. As a result, revenue from three years ago have also fallen 44% 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 55% shows it's an unpleasant look.

In light of this, it's alarming that Guandian Defense TechnologyLtd's P/S sits above the majority of other companies. 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 Does Guandian Defense TechnologyLtd's P/S Mean For Investors?

Even after such a strong price drop, Guandian Defense TechnologyLtd's P/S still exceeds the industry median significantly. Typically, we'd caution against reading too much into price-to-sales ratios when settling on investment decisions, though it can reveal plenty about what other market participants think about the company.

We've established that Guandian Defense TechnologyLtd currently trades on a much higher than expected P/S since its recent revenues have been in decline over the medium-term. With a revenue decline on investors' minds, the likelihood of a souring sentiment is quite high which could send the P/S back in line with what we'd expect. Unless the recent medium-term conditions improve markedly, investors will have a hard time accepting the share price as fair value.

You should always think about risks. Case in point, we've spotted 3 warning signs for Guandian Defense TechnologyLtd you should be aware of.

Of course, profitable companies with a history of great earnings growth are generally safer bets. So you may wish to see this free collection of other companies that have reasonable P/E ratios and have grown earnings strongly.

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