Biogen Ownership

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

Recent Insider Transactions

BRSE:BIIB Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
02 Apr 24	SellCHF 17,974	Priya Singhal	Individual	93	CHF 193.27
22 Feb 24	SellCHF 51,104	Priya Singhal	Individual	262	CHF 195.05
15 Feb 24	BuyCHF 89,236	Eric Rowinsky	Individual	455	CHF 196.12

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	186,298	0.128%
Individual Insiders	348,730	0.239%
General Public	14,149,244	9.71%
Institutions	130,977,370	89.9%

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

Top Shareholders

Top 25 shareholders own 65.76% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
11.4%	The Vanguard Group, Inc.	16,600,163	CHF 2.7b	0.18%	0.05%
11.2%	PRIMECAP Management Company	16,338,294	CHF 2.7b	0.72%	2.18%
10.1%	BlackRock, Inc.	14,646,751	CHF 2.4b	0.74%	0.05%
5.28%	T. Rowe Price Group, Inc.	7,690,270	CHF 1.3b	13.8%	0.13%
4.87%	State Street Global Advisors, Inc.	7,096,018	CHF 1.2b	5.17%	0.05%
3.55%	Wellington Management Group LLP	5,166,491	CHF 845.5m	0.91%	0.15%
2.45%	Geode Capital Management, LLC	3,565,965	CHF 583.6m	4.58%	0.05%
2.28%	JP Morgan Asset Management	3,321,900	CHF 543.6m	1.11%	0.07%
1.43%	Norges Bank Investment Management	2,078,745	CHF 340.2m	42%	0.03%
1.2%	Beutel Goodman & Company Ltd.	1,747,444	CHF 286.0m	11.6%	1.43%
1.09%	UBS Asset Management AG	1,586,297	CHF 259.6m	9.55%	0.03%
1.06%	Legal & General Investment Management Limited	1,548,813	CHF 253.5m	-0.13%	0.05%
1.01%	ClearBridge Investments, LLC	1,468,822	CHF 240.4m	-5.94%	0.21%
1%	Columbia Management Investment Advisers, LLC	1,450,005	CHF 237.3m	81.6%	0.06%
0.98%	Northern Trust Global Investments	1,425,921	CHF 233.4m	2.7%	0.04%
0.84%	BNY Asset Management	1,219,683	CHF 199.6m	-9.2%	0.04%
0.76%	Dimensional Fund Advisors LP	1,110,112	CHF 181.7m	-16%	0.03%
0.75%	Invesco Capital Management LLC	1,088,916	CHF 178.2m	-1.97%	0.09%
0.73%	Goldman Sachs Asset Management, L.P.	1,068,140	CHF 174.8m	47.2%	0.05%
0.68%	Morgan Stanley, Investment Banking and Brokerage Investments	992,453	CHF 162.4m	-10.4%	0.02%
0.67%	RA Capital Management, L.P.	982,139	CHF 160.7m	32.6%	2.16%
0.63%	Van Eck Associates Corporation	922,761	CHF 151.0m	-46.9%	0.19%
0.62%	OrbiMed Advisors LLC	900,900	CHF 147.4m	0%	2.41%
0.62%	Charles Schwab Investment Management, Inc.	900,710	CHF 147.4m	4.88%	0.03%
0.59%	JPMorgan Chase & Co, Private Banking and Investment Banking Investments	862,547	CHF 141.2m	5.94%	0.04%