# Here’s What Power Integrations, Inc.’s (NASDAQ:POWI) P/E Is Telling Us

The goal of this article is to teach you how to use price to earnings ratios (P/E ratios). We’ll show how you can use Power Integrations, Inc.’s (NASDAQ:POWI) P/E ratio to inform your assessment of the investment opportunity. Power Integrations has a P/E ratio of 29.79, based on the last twelve months. That means that at current prices, buyers pay \$29.79 for every \$1 in trailing yearly profits.

### How Do I Calculate A Price To Earnings Ratio?

The formula for P/E is:

Price to Earnings Ratio = Price per Share ÷ Earnings per Share (EPS)

Or for Power Integrations:

P/E of 29.79 = \$70.78 ÷ \$2.38 (Based on the year to December 2018.)

### Is A High P/E Ratio Good?

A higher P/E ratio means that buyers have to pay a higher price for each \$1 the company has earned over the last year. All else being equal, it’s better to pay a low price — but as Warren Buffett said, ‘It’s far better to buy a wonderful company at a fair price than a fair company at a wonderful price.’

### How Growth Rates Impact P/E Ratios

When earnings fall, the ‘E’ decreases, over time. That means unless the share price falls, the P/E will increase in a few years. A higher P/E should indicate the stock is expensive relative to others — and that may encourage shareholders to sell.

Notably, Power Integrations grew EPS by a whopping 155% in the last year. Unfortunately, earnings per share are down 7.1% a year, over 5 years.

### How Does Power Integrations’s P/E Ratio Compare To Its Peers?

The P/E ratio indicates whether the market has higher or lower expectations of a company. The image below shows that Power Integrations has a higher P/E than the average (17.3) P/E for companies in the semiconductor industry.

Its relatively high P/E ratio indicates that Power Integrations shareholders think it will perform better than other companies in its industry classification. The market is optimistic about the future, but that doesn’t guarantee future growth. So investors should delve deeper. I like to check if company insiders have been buying or selling.

### Remember: P/E Ratios Don’t Consider The Balance Sheet

Don’t forget that the P/E ratio considers market capitalization. That means it doesn’t take debt or cash into account. Theoretically, a business can improve its earnings (and produce a lower P/E in the future), by taking on debt (or spending its remaining cash).

Such spending might be good or bad, overall, but the key point here is that you need to look at debt to understand the P/E ratio in context.

### Power Integrations’s Balance Sheet

Power Integrations has net cash of US\$229m. That should lead to a higher P/E than if it did have debt, because its strong balance sheets gives it more options.

### The Bottom Line On Power Integrations’s P/E Ratio

Power Integrations has a P/E of 29.8. That’s higher than the average in the US market, which is 17.5. With cash in the bank the company has plenty of growth options — and it is already on the right track. So it is not surprising the market is probably extrapolating recent growth well into the future, reflected in the relatively high P/E ratio.

Investors should be looking to buy stocks that the market is wrong about. People often underestimate remarkable growth — so investors can make money when fast growth is not fully appreciated. So this free visualization of the analyst consensus on future earnings could help you make the right decision about whether to buy, sell, or hold.

Of course, you might find a fantastic investment by looking at a few good candidates. So take a peek at this free list of companies with modest (or no) debt, trading on a P/E below 20.

We aim to bring you long-term focused research analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material.

If you spot an error that warrants correction, please contact the editor at editorial-team@simplywallst.com. This article by Simply Wall St is general in nature. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. Simply Wall St has no position in the stocks mentioned. Thank you for reading.