DoubleDown Interactive Co., Ltd. (NASDAQ:DDI) shares have continued their recent momentum with a 29% gain in the last month alone. The last 30 days bring the annual gain to a very sharp 41%.

Following the firm bounce in price, when almost half of the companies in the United States' Entertainment industry have price-to-sales ratios (or "P/S") below 1.2x, you may consider DoubleDown Interactive as a stock probably not worth researching with its 2.1x P/S ratio. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the elevated P/S.

How DoubleDown Interactive Has Been Performing

While the industry has experienced revenue growth lately, DoubleDown Interactive's revenue has gone into reverse gear, which is not great. One possibility is that the P/S ratio is high because investors think this poor revenue performance will turn the corner. If not, then existing shareholders may be extremely nervous about the viability of the share price.

Want the full picture on analyst estimates for the company? Then our free report on DoubleDown Interactive will help you uncover what's on the horizon.

How Is DoubleDown Interactive's Revenue Growth Trending?

The only time you'd be truly comfortable seeing a P/S as high as DoubleDown Interactive's is when the company's growth is on track to outshine the industry.

Taking a look back first, the company's revenue growth last year wasn't something to get excited about as it posted a disappointing decline of 2.8%. This means it has also seen a slide in revenue over the longer-term as revenue is down 4.7% in total over the last three years. Accordingly, shareholders would have felt downbeat about the medium-term rates of revenue growth.

Turning to the outlook, the next three years should generate growth of 7.1% per year as estimated by the three analysts watching the company. That's shaping up to be materially lower than the 9.7% per year growth forecast for the broader industry.

With this in consideration, we believe it doesn't make sense that DoubleDown Interactive's P/S is outpacing its industry peers. Apparently many investors in the company are way more bullish than analysts indicate and aren't willing to let go of their stock at any price. Only the boldest would assume these prices are sustainable as this level of revenue growth is likely to weigh heavily on the share price eventually.

What Does DoubleDown Interactive's P/S Mean For Investors?

DoubleDown Interactive's P/S is on the rise since its shares have risen strongly. 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.

It comes as a surprise to see DoubleDown Interactive trade at such a high P/S given the revenue forecasts look less than stellar. Right now we aren't comfortable with the high P/S as the predicted future revenues aren't likely to support such positive sentiment for long. At these price levels, investors should remain cautious, particularly if things don't improve.

It's always necessary to consider the ever-present spectre of investment risk. We've identified 1 warning sign with DoubleDown Interactive, and understanding 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.