Biogen Ownership

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

Recent Insider Transactions

SWX:BIIB Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
02 Apr 24	SellCHF17,974	Priya Singhal	Individual	93	CHF193.27
22 Feb 24	SellCHF51,104	Priya Singhal	Individual	262	CHF195.05
15 Feb 24	BuyCHF89,236	Eric Rowinsky	Individual	455	CHF196.12
28 Apr 23	SellCHF716,213	Ginger Gregory	Individual	2,681	CHF267.14

Insider Trading Volume

Insider Buying: BIIB 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
Private Companies	27,389	0.0188%
State or Government	184,742	0.127%
Individual Insiders	333,599	0.229%
General Public	13,597,870	9.35%
Institutions	131,217,198	90.3%

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

Top Shareholders

Top 25 shareholders own 63.77% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
11.2%	PRIMECAP Management Company	16,264,481	CHF3.0b	1.57%	2.33%
9.91%	The Vanguard Group, Inc.	14,407,330	CHF2.7b	18.2%	0.05%
9.8%	BlackRock, Inc.	14,246,658	CHF2.6b	1.95%	0.05%
4.78%	State Street Global Advisors, Inc.	6,945,665	CHF1.3b	1.17%	0.06%
4.72%	T. Rowe Price Group, Inc.	6,865,672	CHF1.3b	16%	0.12%
3.66%	Wellington Management Group LLP	5,324,396	CHF982.7m	-0.93%	0.16%
2.67%	JP Morgan Asset Management	3,886,172	CHF717.3m	-2.19%	0.1%
2.28%	Geode Capital Management, LLC	3,309,317	CHF610.8m	2.24%	0.05%
1.16%	ClearBridge Investments, LLC	1,679,302	CHF310.0m	-7.89%	0.25%
1.08%	Legal & General Investment Management Limited	1,567,744	CHF289.4m	17.1%	0.06%
1.03%	Northern Trust Global Investments	1,494,963	CHF275.9m	-9.01%	0.05%
1.01%	Norges Bank Investment Management	1,463,571	CHF270.1m	11.9%	0.03%
0.98%	Dimensional Fund Advisors LP	1,424,659	CHF263.0m	3.15%	0.05%
0.98%	Van Eck Associates Corporation	1,421,196	CHF262.3m	19.5%	0.36%
0.93%	BNY Mellon Asset Management	1,355,892	CHF250.3m	-2.61%	0.05%
0.93%	UBS Asset Management AG	1,352,937	CHF249.7m	-8.91%	0.04%
0.87%	Pictet Asset Management Limited	1,257,959	CHF232.2m	3.75%	0.17%
0.85%	Invesco Capital Management LLC	1,236,533	CHF228.2m	35.8%	0.12%
0.83%	Amundi Asset Management SAS	1,207,241	CHF222.8m	10.1%	0.05%
0.8%	Deutsche Asset & Wealth Management	1,158,140	CHF213.8m	29.2%	0.11%
0.68%	Beutel Goodman & Company Ltd.	995,456	CHF183.7m	-0.38%	0.88%
0.68%	American Century Investment Management Inc	988,676	CHF182.5m	9.98%	0.11%
0.67%	First Trust Advisors LP	977,308	CHF180.4m	141%	0.18%
0.66%	Morgan Stanley, Investment Banking and Brokerage Investments	961,874	CHF177.5m	16%	0.03%
0.62%	FMR LLC	900,182	CHF166.1m	-26.9%	0.01%