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	140,368	0.0963%
Individual Insiders	349,221	0.24%
General Public	14,335,833	9.84%
Institutions	130,893,918	89.8%

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

Top Shareholders

Top 25 shareholders own 64.6% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
11.4%	The Vanguard Group, Inc.	16,678,507	US$2.6b	0.47%	0.04%
11.2%	PRIMECAP Management Company	16,315,079	US$2.5b	-0.14%	1.87%
10.1%	BlackRock, Inc.	14,646,751	US$2.3b	0.74%	0.04%
5.04%	State Street Global Advisors, Inc.	7,344,960	US$1.1b	3.51%	0.04%
4.23%	T. Rowe Price Group, Inc.	6,168,832	US$958.8m	-19.8%	0.09%
3.52%	Wellington Management Group LLP	5,131,193	US$797.5m	-0.68%	0.13%
2.48%	Geode Capital Management, LLC	3,613,020	US$561.6m	1.32%	0.04%
2.42%	JP Morgan Asset Management	3,524,314	US$547.8m	6.09%	0.06%
1.43%	Norges Bank Investment Management	2,078,745	US$323.1m	0%	0.03%
1.2%	Beutel Goodman & Company Ltd.	1,744,154	US$271.1m	-0.19%	1.25%
1.14%	UBS Asset Management AG	1,656,544	US$257.5m	4.43%	0.03%
1.04%	Legal & General Investment Management Limited	1,511,506	US$234.9m	-2.41%	0.04%
0.97%	Invesco Capital Management LLC	1,413,892	US$219.8m	29.8%	0.09%
0.93%	Northern Trust Global Investments	1,353,135	US$210.3m	-5.1%	0.03%
0.91%	Morgan Stanley, Investment Banking and Brokerage Investments	1,323,321	US$205.7m	33.3%	0.02%
0.81%	RA Capital Management, L.P.	1,184,456	US$184.1m	20.6%	2.34%
0.79%	Columbia Management Investment Advisers, LLC	1,150,486	US$178.8m	-20.7%	0.04%
0.76%	Dimensional Fund Advisors LP	1,114,340	US$173.2m	0.38%	0.03%
0.67%	BNY Asset Management	982,172	US$152.7m	-19.5%	0.03%
0.65%	Renaissance Technologies LLC	952,706	US$148.1m	54.1%	0.22%
0.63%	Charles Schwab Investment Management, Inc.	913,029	US$141.9m	1.37%	0.02%
0.62%	JPMorgan Chase & Co, Private Banking and Investment Banking Investments	903,148	US$140.4m	4.71%	0.04%
0.62%	Amundi Asset Management SAS	902,664	US$140.3m	31.4%	0.03%
0.56%	OrbiMed Advisors LLC	813,000	US$126.4m	-9.76%	1.81%
0.49%	Massachusetts Financial Services Company	711,184	US$110.5m	29.6%	0.02%