Clean Energy Technologies, Inc. (NASDAQ:CETY) shareholders that were waiting for something to happen have been dealt a blow with a 27% share price drop in the last month. The drop over the last 30 days has capped off a tough year for shareholders, with the share price down 40% in that time.

In spite of the heavy fall in price, you could still be forgiven for feeling indifferent about Clean Energy Technologies' P/S ratio of 2.3x, since the median price-to-sales (or "P/S") ratio for the Oil and Gas industry in the United States is also close to 1.9x. Although, it's not wise to simply ignore the P/S without explanation as investors may be disregarding a distinct opportunity or a costly mistake.

How Has Clean Energy Technologies Performed Recently?

With revenue growth that's exceedingly strong of late, Clean Energy Technologies has been doing very well. The P/S is probably moderate because investors think this strong revenue growth might not be enough to outperform the broader industry in the near future. If that doesn't eventuate, then existing shareholders have reason to be feeling optimistic about the future direction of the share price.

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 Clean Energy Technologies' earnings, revenue and cash flow.

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

There's an inherent assumption that a company should be matching the industry for P/S ratios like Clean Energy Technologies' to be considered reasonable.

Taking a look back first, we see that the company's revenues underwent some rampant growth over the last 12 months. The latest three year period has also seen an incredible overall rise in revenue, aided by its incredible short-term performance. So we can start by confirming that the company has done a tremendous job of growing revenue over that time.

When compared to the industry's one-year growth forecast of 6.7%, the most recent medium-term revenue trajectory is noticeably more alluring

In light of this, it's curious that Clean Energy Technologies' P/S sits in line with the majority of other companies. It may be that most investors are not convinced the company can maintain its recent growth rates.

The Bottom Line On Clean Energy Technologies' P/S

Clean Energy Technologies' plummeting stock price has brought its P/S back to a similar region as the rest of the 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.

To our surprise, Clean Energy Technologies revealed its three-year revenue trends aren't contributing to its P/S as much as we would have predicted, given they look better than current industry expectations. When we see strong revenue with faster-than-industry growth, we can only assume potential risks are what might be placing pressure on the P/S ratio. It appears some are indeed anticipating revenue instability, because the persistence of these recent medium-term conditions would normally provide a boost to the share price.

There are also other vital risk factors to consider and we've discovered 4 warning signs for Clean Energy Technologies (1 is a bit unpleasant!) that you should be aware of before investing here.

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.