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Below is a table of the BIIB shares outstanding history going back to 2/5/2010:
Also see: BIIB Market Cap History BIIB YTD Return |
BIIB Shares Outstanding History — Biogen Share Count Over Time
As of 4/27/2026 Biogen has 147.64 million BIIB shares outstanding. Investors often track the BIIB shares outstanding history to compare shareholder return trends against the change in share count over time.
This page shows BIIB share count trends over time, with 67 historical shares outstanding datapoints presented, dating back to 2/5/2010.
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BIIB Historical Shares Outstanding: -3.64% CAGR 
Mouse over chart for data details
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| BIIB Stock Price Chart |
| About Biogen Inc |
| Biogen Inc. is a biopharmaceutical company dedicated to developing advanced therapies for serious diseases. Its portfolio includes treatments for multiple sclerosis (MS), spinal muscular atrophy (SMA), Alzheimer's disease, and amyotrophic lateral sclerosis (ALS). Key products include TECFIDERA, VUMERITY, AVONEX, PLEGRIDY, TYSABRI and FAMPYRA for MS; SPINRAZA for SMA; SKYCLARYS for Friedreich's Ataxia; QALSODY for ALS; and FUMADERM for severe plaque psoriasis. Co. also collaborates on LEQEMBI, ZURZUVAE, RITUXAN, GAZYVA, OCREVUS, LUNSUMIO and COLUMVI, and commercializes biosimilars such as BENEPALI, IMRALDI, FLIXABI and BYOOVIZ. We show 67 historical shares outstanding datapoints in our coverage of BIIB's shares outstanding history. Understanding the changing numbers of BIIB shares outstanding — and comprehending the concept of differing number of shares outstanding in general comparing companies like BIIB versus peers — is critical for investors. Many "beginner" or "novice" investors will look at one stock trading at a price of $10 per share and another trading at a price of $20 per share and think the latter company is worth twice as much. Of course, that is a completely meaningless comparison without also knowing how many shares outstanding there are for each of the two companies. Furthermore, via issuance of new shares over time, or the repurchase of existing shares, the number of shares outstanding can fluctuate over the course of history. With this page we aim to empower investors researching BIIB by allowing them to research BIIB shares outstanding history as well as any other stock in our coverage universe. |
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| BIIB Share Performance |
| Shares Outstanding Peers |
| Biogen (BIIB) is categorized under the Healthcare sector; to help you further research historical shares outstanding numbers, below are some other companies in the same sector:
BIMI Shares Outstanding History BIO Shares Outstanding History BIOC Shares Outstanding History BIOL Shares Outstanding History BIOR Shares Outstanding History BIOS Shares Outstanding History BIVI Shares Outstanding History BJDX Shares Outstanding History BKD Shares Outstanding History BLCM Shares Outstanding History More Healthcare companies » |
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