What is the current shares outstanding of BIIB?

As of today, BIIB shares outstanding is 147.82M

What is 1-year change in BIIB shares outstanding?

BIIB shares outstanding is up +0.76% year-over-year

BIIB shares outstanding is up +2.02% over the past 3 years

BIIB shares outstanding is currently -57.03% below its historical high of 344.03M set on March 31, 2005

147.82M66.23K+0.04%

October 30, 2026

Current Value: As of today, BIIB has 147.82M outstanding shares, up +0.04% on October 30, 2026
Historical Performance: BIIB shares outstanding is up +0.76% year-over-year, up +2.02% over the past 3 years
All-Time High Comparison: BIIB shares outstanding is currently -57.03% below its historical high of 344.03M set on March 31, 2005
3-Year Low Comparison: BIIB shares outstanding is +2.02% above its 3-year low of 144.90M reached on December 31, 2023

BIIB Performance
Metric	Date	Value	1Y	3Y	5Y
Shares Outstanding	Oct 30, 26	147.82M	+0.8%	+2.0%	+0.6%
Price	Oct 29, 26	$249.65	+68.8%	+6.5%	-6.4%
Market Cap	Oct 29, 26	$37B	+70.1%	+8.6%	-5.8%
PE Ratio	Oct 29, 26	106.87	+692.8%	+358.3%	+309.6%
TTM Revenue	Sep 30, 26	$9.90B	+2.1%	+3.0%	+13.8%
TTM EPS	Sep 30, 26	$2.34	-78.7%	-76.8%	-77.1%
	Oct 29, 26	$43.40B	+78.5%	+10.1%	-1.0%
TTM Net Income	Sep 30, 26	$347.50M	-78.4%	-76.2%	-83.5%
TTM Dividend	Oct 29, 26	-	–	–	–

BIIB Shares Outstanding Highs Comparison
Period	High	Date	Current
1Y	147.82M	Oct 30, 26	at high
3Y	147.82M	Oct 30, 26	at high
5Y	147.82M	Oct 30, 26	at high
All	344.03M	Mar 31, 05	-57.0%

BIIB Shares Outstanding Lows Comparison
Period	Low	Date	Current
1Y	146.70M	N/A	+0.8%
3Y	144.90M	Dec 31, 23	+2.0%
5Y	144.00M	Sep 30, 22	+2.6%
All	118.77M	Mar 30, 98	+24.5%

What is the current shares outstanding of BIIB?: As of today, BIIB shares outstanding is 147.82M
What is 1-year change in BIIB shares outstanding?: BIIB shares outstanding is up +0.76% year-over-year
What is 3-year change in BIIB shares outstanding?: BIIB shares outstanding is up +2.02% over the past 3 years
How far is BIIB shares outstanding from its all-time high?: BIIB shares outstanding is currently -57.03% below its historical high of 344.03M set on March 31, 2005

BIIB Official Website www.biogen.com
Most Recent Annual Report (10-K) www.sec.gov/Archives/edgar/data/875045/000087504526000013/0000875045-26-000013-index.htm
BIIB Profile on Yahoo Finance finance.yahoo.com/quote/BIIB
BIIB Profile on NASDAQ.com www.nasdaq.com/market-activity/stocks/biib