Based on key financial metrics such as the price-to-sales ratio, shareholder yield and the price-earnings ratio, the following 3 stocks made the list for top value stocks in the Biotechnology industry. Those looking for value stocks to add to their portfolio may want to use this list as a starting point for further investment research.

Why Focus on Undervalued Biotechnology Stocks?

Value investors seek to buy stocks at a discount to their intrinsic value. Long-term returns show that such strategies are advantageous. Value stocks, as a group, tend to outperform growth stocks over extended periods of time. Typically, value investors perform financial analysis of numerous metrics, don’t follow the herd and are long-term investors.

AAII’s A+ Investor Value Grade is derived from a stock’s Value Score. The Value Score is the percentile rank of the average of the percentile ranks of the price-to-sales ratio, price-earnings ratio, enterprise-value-to-EBITDA (EV/EBITDA) ratio, shareholder yield, price-to-book-value ratio and price-to-free-cash-flow ratio. The score is variable, meaning it can consider all six ratios or, should any of the six ratios not be valid, the remaining ratios that are valid. To be assigned a Value Score, stocks must have a valid (non-null) ratio and corresponding ranking for at least two of the six valuation ratios.

What Goes Into AAII’s Value Grade?

Stock evaluation requires access to huge amounts of data as well as the knowledge and time to sift through it all, make sense of financial ratios, read income statements and analyze recent stock movement. AAII created A+ Investor, a robust data suite that condenses data research in an actionable and customizable way suitable for investors of all knowledge levels, to help investors with that task.

AAII’s proprietary stock grades come with A+ Investor. These offer intuitive A–F grades for more than just value. It is possible for a stock to appear cheap based on one valuation metric but appear expensive on another. It is also possible for one valuation ratio to be associated with outperforming stocks during certain periods of time but not others. Some stocks may even have null values for certain metrics like the price-earnings ratio or the price-to-book ratio but not others. An example of this would be a company with losses instead of profits or a negative book value because of heavy borrowing. Negative earnings or book value result in non-meaningful ratios that are left blank or null.

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3 Undervalued Biotechnology Stocks

Of course, there are countless value stocks that are worth mentioning, but this is a concise list of the top 3 undervalued stocks in the Biotechnology industry for Thursday, June 04, 2026. Let’s take a closer look at their individual scores to see how they measure up against each other and the Biotechnology industry median.

The Value Grade is assigned based on how each stock’s composite valuation compares to all other stocks.

The process for assigning grades starts with each variable for a given stock. The percentile rankings for all valid ratios that a stock has are calculated. So, for instance, a stock could have a price-to-book ranking in the 43rd percentile, a price-earnings ranking in the 67th percentile, a price-to-sales ranking in the 23rd percentile, etc. Then, those rankings are averaged for each stock. (A minimum of two valid variables are required, though all six will be used if available.)

Once the average of the individual variables is calculated, that average is ranked against all stocks. Put another way, each stock’s composite valuation is compared to all other stocks. These ranks are then sorted into quintiles from the cheapest 20% (a grade of A) to the most expensive 20% (a grade of F).

As always, we recommend that you conduct proper due diligence and research before investing in any security. We also suggest that investors utilize numerous grades, not just value, when it comes to deciding whether a company is a good fit for their allocation needs.

Amarin Corporation plc’s Value Grade

Value Grade:

Amarin Corporation plc, a pharmaceutical company, engages in the commercialization and development of therapeutics for the treatment of cardiovascular diseases in the United States, Europe, and internationally. It offers VASCEPA, a prescription-only omega-3 fatty acid product, used as an adjunct to diet for reducing triglyceride levels in adult patients with severe hypertriglyceridemia. The company sells its products principally through wholesalers, selected regional wholesalers, and retail and mail order pharmacy providers. It has a collaboration with Mochida Pharmaceutical Co., Ltd. to develop and commercialize drug products and indications based on the active pharmaceutical ingredient in Vascepa, the omega-3 acid, EPA. The company was formerly known as Ethical Holdings plc and changed its name to Amarin Corporation plc in 1999. Amarin Corporation plc was incorporated in 1989 and is headquartered in Dublin, Ireland.

Stocks with a Value Score from 81 to 100 are considered deep value, those with a score between 61 and 80 are value and so on.

Amarin Corporation plc has a Value Score of 75, which is considered to be undervalued.

When you look at Amarin Corporation plc’s price-to-sales ratio at 1.39 compared to the industry median at 8.65, this company has a lower price relative to revenue compared to its peers. This could make Amarin Corporation plc’s stock more attractive for value investors.

Shareholder yield is the sum of a stock’s dividend yield (paid over previous 12 months minus special dividends) and the percentage of net share buybacks over the previous 12 months. Amarin Corporation plc’s shareholder yield is higher than its industry median ratio of (16.40%). Value investors may look for an attractive shareholder yield because it can be a powerful tool for identifying if the company has a good management team.

As one of the most common value metrics, the price-to-book ratio evaluates a company’s current market price relative to its book value. Amarin Corporation plc’s price-to-book ratio is lower than its industry median ratio of 2.72. This could make Amarin Corporation plc more attractive to investors looking for a new addition to their portfolio.

Lastly, let’s take a look at Amarin Corporation plc’s price-to-free-cash-flow ratio (P/FCF), which can indicate a company’s market value relative to its operating cash flow. Amarin Corporation plc’s price-to-free-cash-flow ratio is lower than its industry median ratio of 22.80. This could make Amarin Corporation plc more attractive because the lower P/FCF ratio indicates that Amarin Corporation plc is undervalued. The P/FCF ratio metric can also be viewed over a long-term time frame to see if the company's cash flow to share price value is generally improving or worsening.

Keros Therapeutics, Inc.’s Value Grade

Value Grade:

Keros Therapeutics, Inc., a clinical-stage biopharmaceutical company, develops and commercializes novel therapeutics to treat patients with disorders linked to dysfunctional signaling of the transforming growth factor-beta family of proteins in the United States. It develops rinvatercept, which acts as a ligand trap and inhibits the biological effects of myostatin and activin A in Phase 1 clinical trials for Duchenne Muscular Dystrophy and Amyotrophic Lateral Sclerosis; and elritercept to target TGF-ß signaling pathways to address diseases that arise from ineffective hematopoiesis in Phase 3 clinical trials for Myelodysplastic Syndromes and Phase 2 clinical trials for Myelofibrosis. The company has collaboration and license agreements with Hansoh (Shanghai) Healthtech Co., Ltd. to develop, manufacture, and commercialize elritercept and licensed products containing elritercept; and Takeda Pharmaceuticals U.S.A., Inc. to develop, manufacture, and commercialize elritercept and certain derivative compounds. Keros Therapeutics, Inc. was incorporated in 2015 and is headquartered in Lexington, Massachusetts.

Stocks with a Value Score from 81 to 100 are considered deep value, those with a score between 61 and 80 are value and so on.

Keros Therapeutics, Inc. has a Value Score of 88, which is considered to be undervalued.

Keros Therapeutics, Inc.’s price-to-book ratio is higher than its peers. This could make Keros Therapeutics, Inc. less attractive for value investors when compared to the industry median at 2.72.

You can read more about Keros Therapeutics, Inc.’s key financial metrics like shareholder yield, price-to-free-cash-flow and EV/EBITDA ratio, or learn more about its Momentum and Growth Grades, by subscribing to A+ Investor.

Rigel Pharmaceuticals, Inc.’s Value Grade

Value Grade:

Rigel Pharmaceuticals, Inc., a biotechnology company, develops and provides therapies that enhance the lives of patients with hematologic disorders and cancer in the United States. The company offers TAVALISSE, an oral spleen tyrosine kinase inhibitor for the treatment of adult patients with chronic immune thrombocytopenia; REZLIDHIA, a non-intensive monotherapy to treat adult patients with relapsed or refractory (R/R) acute myeloid leukemia (AML) with a susceptible isocitrate dehydrogenase-1 (IDH1) mutation as detected by an FDA-approved test; and GAVRETO, a once daily, small molecule, oral, kinase inhibitor for the treatment of adult patients with metastatic rearranged during transfection (RET) fusion-positive non-small cell lung cancer (NSCLC), as well as to treat adult and pediatric patients twelve years of age and older with advanced or metastatic RET fusion-positive thyroid cancer. It also develops R289, an oral interleukin receptor-associated kinases 1 and 4 (IRAK1/4) inhibitor, which is being advanced to Phase 1b study for the treatment of hematology-oncology, autoimmune, and inflammatory diseases, as well as to treat lower-risk myelodysplastic syndrome. The company has strategic development collaboration with The University of Texas MD Anderson Cancer Center (MDACC) for the development of olutasidenib in AML and other hematologic cancers with IDH1mutations; and the Collaborative Network for Neuro-Oncology Clinical Trial (CONNECT) to conduct a Phase 2 clinical trial to evaluate olutasidenib in combination with temozolomide in patients with high-grade glioma harboring an IDH1 mutation. Rigel Pharmaceuticals, Inc. was incorporated in 1996 and is headquartered in South San Francisco, California.

Stocks with a Value Score from 81 to 100 are considered deep value, those with a score between 61 and 80 are value and so on.

Rigel Pharmaceuticals, Inc. has a Value Score of 86, which is considered to be undervalued.

Rigel Pharmaceuticals, Inc.’s price-earnings ratio is 1.6 compared to the industry median at 19.2. This means that it has a lower price relative to its earnings compared to its peers. This makes Rigel Pharmaceuticals, Inc. more attractive for value investors.

Rigel Pharmaceuticals, Inc.’s price-to-book ratio is higher than its peers. This could make Rigel Pharmaceuticals, Inc. less attractive for value investors when compared to the industry median at 2.72.

You can read more about Rigel Pharmaceuticals, Inc.’s key financial metrics like shareholder yield, price-to-free-cash-flow and EV/EBITDA ratio, or learn more about its Momentum and Growth Grades, by subscribing to A+ Investor.

Other Biotechnology Stock Grades

Value is just one of the five Stock Grades included in our A+ Investor service. AAII members can see the top-graded stocks—those with grades of A or B for value, growth, momentum, earnings estimate revisions and quality—on the A+ Stock Grades Screener.

Also, if you want full access to all of AAII’s premium services, you can subscribe to one convenient bundled plan called AAII Platinum where you can try out A+ Investor, AAII Dividend Investing, the Stock Superstars Report, Growth Investing and VMQ Stocks. With the other premium services, you can dive deep into additional metrics, portfolios, commentary and information about Biotechnology stocks as well as other industrys.

Choosing Which of the 3 Best Biotechnology Stocks Is Right for You

Choosing which value stocks to invest in will ultimately depend on your individual goals and allocation; however, comparing similar value stocks in the same industry can help you analyze which might be better investments for you in the long run. So, let’s take a look at the Value Grade for all of our stocks.

• Amarin Corporation plc stock has a Value Grade of B.
• Keros Therapeutics, Inc. stock has a Value Grade of A.
• Rigel Pharmaceuticals, Inc. stock has a Value Grade of A.

Now that you have a bit more background about each of the 3 undervalued stocks in the Biotechnology industry as well as their overall grades, it’s time for you to conduct additional research to see if these could fit your portfolio needs based on your goals and risk tolerance. AAII can help you figure out both and identify which investments align with what works best for you.

We do so through a program of education that teaches you to invest for yourself and become an effective manager of your own wealth—no more relying on others for your financial independence. You can rely on AAII for timeless articles on financial planning and stock-picking, unbiased research and actionable analysis that makes you a better investor.

A+ Investor adds to that qualitative teaching by giving you a powerful data suite that helps you whittle down investment decisions to find stocks, exchange-traded funds (ETFs) or mutual funds that meet your needs.

Additional Resources About Biotechnology Stocks

Want to learn more about Biotechnology stocks to see if they could be the right investment for you? Check out some additional resources and articles to help you on your financial journey.

• 3 Undervalued Biotechnology Stocks for Wednesday, June 03
• Is AbbVie Inc. (ABBV) Overvalued?
• Is Amgen Inc. (AMGN) Overvalued?
• Is Gilead Sciences, Inc. (GILD) Overvalued?

AAII Disclaimer

We make no representations or warranties that any investor will, or is likely to, achieve profits similar to those shown, because past, hypothetical or simulated performance is not necessarily indicative of future results. Before making an investment decision, you should consider your circumstances and whether the information on our content is applicable to your situation. This information was prepared in good faith and we accept no liability for any errors or omissions. The full disclaimer can be read here.