BIIB Shares Outstanding History
Below is a table of the BIIB shares outstanding history going back to 2/5/2010:

Date BIIB Shares Outstanding
2/5/2010269.60M
4/16/2010267.00M
7/16/2010241.92M
10/22/2010238.30M
1/31/2011240.91M
4/18/2011241.63M
7/22/2011242.55M
10/25/2011242.92M
1/31/2012238.73M
4/24/2012239.56M
7/18/2012236.35M
10/19/2012236.60M
1/31/2013236.31M
4/18/2013237.37M
7/18/2013237.67M
10/21/2013236.21M
1/31/2014236.39M
4/18/2014237.20M
7/18/2014236.14M
10/17/2014236.16M
1/30/2015234.61M
3/23/2015234.61M
4/17/2015235.23M
7/17/2015235.17M
10/16/2015222.90M
1/29/2016218.67M
4/15/2016219.05M
7/15/2016219.12M
10/21/2016217.57M
1/27/2017215.95M
4/21/2017212.12M
7/21/2017211.43M
10/20/2017211.48M
1/26/2018211.56M
4/20/2018211.01M
7/20/2018201.44M
10/19/2018201.48M
2/1/2019196.71M
4/19/2019193.89M
7/19/2019184.45M
10/21/2019180.44M
2/4/2020174.06M

Also see: BIIB Market Cap History
BIIB YTD Return
BIIB RSI
BIIB DMA
BIIB MACD
BIIB Technical Analysis
BIIB Historical Shares Outstanding:
-4.28% CAGR
BIIB Historical Shares Outstanding: +-4.28% CAGR

Mouse over chart for data details
2/5/2010 ...2/4/2020
Biogen is a biopharmaceutical company focused on discovering, developing and delivering therapies for people living with neurological and neurodegenerative diseases as well as related therapeutic adjacencies. Co.'s main growth areas include multiple sclerosis (MS) and neuroimmunology; Alzheimer's disease and dementia; neuromuscular disorders, including spinal muscular atrophy (SMA) and amyotrophic lateral sclerosis; movement disorders, including Parkinson's disease; and ophthalmology. Co.'s marketed products include TECFIDERA, AVONEX, PLEGRIDY, TYSABRI, VUMERITY and FAMPYRA for the treatment of MS, SPINRAZA for the treatment of SMA and FUMADERM for the treatment of severe plaque psoriasis. We show 42 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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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:

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