Biogen Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

NasdaqGS:BIIB Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
02 Apr 24	SellUS$19,817	Priya Singhal	Individual	93	US$213.09
22 Feb 24	SellUS$57,962	Priya Singhal	Individual	262	US$221.23
15 Feb 24	BuyUS$101,256	Eric Rowinsky	Individual	455	US$222.54

Insider Trading Volume

Insider Buying: Insufficient data to determine if insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of BIIB?
Owner Type	Number of Shares	Ownership Percentage
State or Government	161,585	0.111%
Individual Insiders	348,300	0.239%
General Public	14,153,737	9.72%
Institutions	130,933,273	89.9%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 64.25% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
11.4%	The Vanguard Group, Inc.	16,570,398	US$3.8b	15%	0.06%
11.1%	PRIMECAP Management Company	16,220,716	US$3.7b	-0.27%	2.54%
9.72%	BlackRock, Inc.	14,144,988	US$3.2b	-0.71%	0.05%
4.64%	T. Rowe Price Group, Inc.	6,759,599	US$1.5b	-1.54%	0.14%
4.63%	State Street Global Advisors, Inc.	6,747,008	US$1.5b	-2.86%	0.06%
3.52%	Wellington Management Group LLP	5,120,142	US$1.2b	-3.84%	0.17%
2.34%	Geode Capital Management, LLC	3,409,674	US$775.5m	3.03%	0.06%
2.26%	JP Morgan Asset Management	3,285,493	US$747.3m	-15.5%	0.09%
1.19%	Van Eck Associates Corporation	1,737,340	US$395.1m	22.2%	0.44%
1.08%	Beutel Goodman & Company Ltd.	1,565,785	US$356.1m	57.3%	1.59%
1.07%	ClearBridge Investments, LLC	1,561,660	US$355.2m	-7.01%	0.26%
1.07%	Legal & General Investment Management Limited	1,550,839	US$352.7m	-1.08%	0.07%
1.01%	Norges Bank Investment Management	1,463,571	US$332.9m	0%	0.03%
0.99%	UBS Asset Management AG	1,447,969	US$329.3m	7.02%	0.04%
0.95%	Northern Trust Global Investments	1,388,386	US$315.8m	-7.13%	0.05%
0.92%	BNY Asset Management	1,343,215	US$305.5m	-0.93%	0.05%
0.91%	Dimensional Fund Advisors LP	1,320,986	US$300.4m	-7.28%	0.05%
0.76%	Invesco Capital Management LLC	1,110,825	US$252.6m	-10.2%	0.11%
0.76%	Morgan Stanley, Investment Banking and Brokerage Investments	1,108,047	US$252.0m	15.2%	0.03%
0.71%	Deutsche Asset & Wealth Management	1,030,940	US$234.5m	-11%	0.07%
0.7%	Pictet Asset Management Limited	1,014,278	US$230.7m	-19.4%	0.15%
0.68%	Amundi Asset Management SAS	997,127	US$226.8m	-17.4%	0.05%
0.62%	OrbiMed Advisors LLC	900,900	US$204.9m	8.86%	2.83%
0.61%	Renaissance Technologies LLC	884,704	US$201.2m	16.6%	0.31%
0.59%	Charles Schwab Investment Management, Inc.	858,805	US$195.3m	0%	0.03%