Illumina, Inc.'s (NASDAQ:ILMN) price-to-sales (or "P/S") ratio of 4.7x may not look like an appealing investment opportunity when you consider close to half the companies in the Life Sciences industry in the United States have P/S ratios below 3.7x. Although, it's not wise to just take the P/S at face value as there may be an explanation why it's as high as it is.

What Does Illumina's Recent Performance Look Like?

While the industry has experienced revenue growth lately, Illumina's revenue has gone into reverse gear, which is not great. Perhaps the market is expecting the poor revenue to reverse, justifying it's current high P/S.. If not, then existing shareholders may be extremely nervous about the viability of the share price.

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

Illumina's P/S ratio would be typical for a company that's expected to deliver solid growth, and importantly, perform better than the industry.

Retrospectively, the last year delivered virtually the same number to the company's top line as the year before. Still, the latest three year period was better as it's delivered a decent 12% overall rise in revenue. Accordingly, shareholders probably wouldn't have been overly satisfied with the unstable medium-term growth rates.

Looking ahead now, revenue is anticipated to climb by 4.6% per annum during the coming three years according to the analysts following the company. Meanwhile, the rest of the industry is forecast to expand by 7.3% per year, which is noticeably more attractive.

With this information, we find it concerning that Illumina is trading at a P/S higher than the industry. It seems most investors are hoping for a turnaround in the company's business prospects, but the analyst cohort is not so confident this will happen. There's a good chance these shareholders are setting themselves up for future disappointment if the P/S falls to levels more in line with the growth outlook.

The Key Takeaway

Generally, our preference is to limit the use of the price-to-sales ratio to establishing what the market thinks about the overall health of a company.

Despite analysts forecasting some poorer-than-industry revenue growth figures for Illumina, this doesn't appear to be impacting the P/S in the slightest. When we see a weak revenue outlook, we suspect the share price faces a much greater risk of declining, bringing back down the P/S figures. This places shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

The company's balance sheet is another key area for risk analysis. Take a look at our free balance sheet analysis for Illumina with six simple checks on some of these key factors.

If these risks are making you reconsider your opinion on Illumina, explore our interactive list of high quality stocks to get an idea of what else is out there.

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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.