iRobot Corporation (NASDAQ:IRBT) shares have continued their recent momentum with a 51% gain in the last month alone. But the last month did very little to improve the 61% share price decline over the last year.

Although its price has surged higher, there still wouldn't be many who think iRobot's price-to-sales (or "P/S") ratio of 0.2x is worth a mention when the median P/S in the United States' Consumer Durables industry is similar at about 0.7x. 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.

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Check out our latest analysis for iRobot

How Has iRobot Performed Recently?

For example, consider that iRobot's financial performance has been poor lately as its revenue has been in decline. Perhaps investors believe the recent revenue performance is enough to keep in line with the industry, which is keeping the P/S from dropping off. If not, then existing shareholders may be a little nervous about the viability 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 iRobot's earnings, revenue and cash flow.

Is There Some Revenue Growth Forecasted For iRobot?

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

In reviewing the last year of financials, we were disheartened to see the company's revenues fell to the tune of 28%. As a result, revenue from three years ago have also fallen 59% overall. So unfortunately, we have to acknowledge that the company has not done a great job of growing revenue over that time.

Comparing that to the industry, which is predicted to deliver 3.2% growth in the next 12 months, the company's downward momentum based on recent medium-term revenue results is a sobering picture.

In light of this, it's somewhat alarming that iRobot's P/S sits in line with 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 on the share price eventually.

What We Can Learn From iRobot's P/S?

iRobot appears to be back in favour with a solid price jump bringing its P/S back in line with other companies in the industry 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 find it unexpected that iRobot 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. Even though it matches the industry, we're uncomfortable with the current P/S ratio, as this dismal revenue performance is unlikely to support a more positive sentiment for long. Unless the the circumstances surrounding the recent medium-term improve, it wouldn't be wrong to expect a a difficult period ahead for the company's shareholders.

We don't want to rain on the parade too much, but we did also find 4 warning signs for iRobot that you need to be mindful of.

If strong companies turning a profit tickle your fancy, then you'll want to check out this free list of interesting companies that trade on a low P/E (but have proven they can grow earnings).

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