It hasn't been a great afternoon session for Bluebird Bio investors, who have watched their shares sink by -5.9% to a price of $7.25. Some of you might be wondering if it's time to buy the dip. If you are considering this, make sure to check the company's fundamentals first to determine if the shares are fairly valued at today's prices.
Bluebird Bio, Inc., a biotechnology company, researches, develops, and commercializes transformative gene therapies for severe genetic diseases. The company belongs to the Healthcare sector, which has an average price to earnings (P/E) ratio of 13.21 and an average price to book (P/B) ratio of 4.07. In contrast, bluebird bio has a trailing 12 month P/E ratio of -0.7 and a P/B ratio of 3.8.
P/B ratios are calculated by dividing the company's market value by its book value. The book value refers to all of the company's tangible assets minus its liabilities -- meaning that intangibles such as intellectual property, brand name, and good will are not taken into account. Traditionally, a P/B ratio of around 1 shows that a company is fairly valued, but owing to consistently higher valuations in the modern era, investors generally compare against sector averages.
P/E ratios have their limits on their usefulness too. Since the P/E ratio is the share price divided by earnings per share, the ratio is determined partially by market sentiment on the stock. Sometimes a negative sentiment translates to a lower market price and therefore a lower P/E ratio -- and there might be good reasons for this negative sentiment.
One of the main reasons not to blindly invest in a company with a low P/E ratio is that it might have low growth expectations. Low growth correlates with low stock performance, so it's useful to factor growth into the valuation process. One of the easiest ways to do this is to divide the company's P/E ratio by its expected growth rate, which results in the price to earnings growth, or PEG ratio.
Bluebird Bio's PEG ratio is -0.03. Since it's negative, the company actually has negative growth expectations, and most investors will probably avoid the stock unless it has an exceptionally low P/E and P/B ratio.