7 Essential Rules for Investing in Biotech Stocks

Successful investing boils down to minimizing risk while maximizing the potential for reward. That's true whether you're investing in stocks, bonds, cryptocurrencies, or anything else. But how you actually go about it can vary based on what your investment is.

Biotech has its own unique requirements for minimizing risk and maximizing the potential for reward. Here are seven essential rules for investing in biotech stocks that should help you increase your chances for success. All you have to remember is B-I-O-T-E-C-H.

Dollar symbol made up of various pills
Dollar symbol made up of various pills

Image source: Getty Images.

1. Be aware of the stage of the company

The first essential rule for biotech investing makes a difference in how several of the other rules are applied. There are three general categories of biotechs: preclinical stage, clinical stage, and commercial stage.

Preclinical-stage biotechs don't have a product in human testing yet. These will be the most risky stocks to buy, since most preclinical drugs never make it to market. Clinical-stage biotechs can vary from companies with experimental drugs in early, phase 1 clinical studies to those with drugs that are in late-stage phase 3 studies. In general, the farther along a biotech's drugs are in clinical testing, the less risky the stock will be. Keep in mind, however, that over 35% of phase 3 drugs, on average, don't move forward.

Commercial-stage biotechs are usually the least risky investments, because they have one or more products on the market. However, even biotechs with approved drugs can face challenges with their commercial launches. For example, MannKind (NASDAQ: MNKD) won FDA approval for inhaled insulin Afrezza in 2014, but sales for the drug totaled less than $3 million in the first half of 2017.

2. Investigate the disease(s) targeted by the biotech

If you want to gain a solid understanding of a biotech stock, you need to understand the disease(s) that the company is targeting. One important reason for doing this is to get a feel for the market potential for the biotech's drugs. There is a counterintuitive dynamic in the biotech industry, though: Very small markets can sometimes be the most lucrative markets.

Sarepta Therapeutics (NASDAQ: SRPT) is a great example of this dynamic. The biotech primarily focuses on development of treatments for Duchenne muscular dystrophy (DMD), a rare genetic disease that affects less than 20 out of every 100,000 live births. But because insurers and other payers are willing to reimburse at a high rate for Sarepta's Exondys 51 treatment, the biotech made over $51 million in sales during the first half of this year -- much higher than that of MannKind, even though it targets diabetes, a much more prevalent disease.