Biogen BIIB Institutional Ownership

NASDAQ BIIB

$217.15 +1.72 (+0.80%)

As of: Sep 11, 2026 · 3:59 PM EDT

Institutions by Trading Activity

1,033 Institutions

Increased 547 53.0%

Unchanged 193 18.7%

Reduced 293 28.4%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

97.14%

▲+5.88 pp QoQ

Shares Held by Institutions

143.48Mn

of 147.70Mn outstanding

▲+8.01% QoQ

Shares Outstanding

147.70Mn

4.22Mn held outside 13F filers

Institutional Investors

1,033

filed 13F for Jun 2026

▲+31 vs prior quarter

Net Shares Added (QoQ)

+10.64Mn

accumulated since last quarter

Value of Holdings

$31.68Bn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Biogen Inc. (NASDAQ:BIIB) showed up in the 13F filings of 1,033 institutional investors as of June 2026.

They owned 97.1% of outstanding stock in June 2026, up from 91.3% the prior quarter.
Their total shares held in BIIB increased 8.01% from the prior quarter, while the number of investors in Biogen increased 19.98% year over year.
During the quarter, 547 of these 1,033 funds increased positions in BIIB, 293 reduced exposure, and 193 held steady.
The aggregate institutional position in Biogen amounted to 143.48Mn shares as of June 2026, up by 10.64Mn shares quarter on quarter, and up 12.3Mn shares year over year.
As of June 30, 2026, FMR LLC held the largest stake in Biogen with 18.22Mn shares, accounting for 12.33% of total shares outstanding.
Top purchasers of BIIB stock for the quarter ending June 2026 included FMR LLC (5.41Mn), NORGES BANK (2.58Mn), Pacer Advisors, Inc. (1.12Mn), Sixth Street Partners Management Company, L.P. (1.12Mn), Amundi (726.0K).
The biggest sellers of Biogen for the quarter ending June 2026 included T. Rowe Price Investment Management, Inc. (1.05Mn), VAN ECK ASSOCIATES CORP (981.75K), Point72 Asset Management, L.P. (721.47K), Boston Partners (436.65K), BALYASNY ASSET MANAGEMENT L.P. (384.96K).
Per Business Quant, the top 10 investors in BIIB for the quarter ending June 2026 include FMR LLC (18.22Mn), BlackRock, Inc. (15.99Mn), PRIMECAP MANAGEMENT CO/CA/ (15.15Mn), VANGUARD CAPITAL MANAGEMENT LLC (9.65Mn), State Street Corp (7.34Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (6.6Mn), GEODE CAPITAL MANAGEMENT, LLC (4.45Mn), WELLINGTON MANAGEMENT GROUP LLP (3.12Mn), NORGES BANK (2.58Mn), Morgan Stanley (2.41Mn).

Form 13F Holdings

1,033 Institutional Holders

Report period 30 Jun, 2026

Total shares held 143.48Mn

Of outstanding 97.14%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	FMR LLC	0000315066	18,217,239	12.33%	▲5,409,698	+42.24%	$3.94Bn
2	BlackRock, Inc.	0002012383	15,985,736	10.82%	▲11,135	+0.07%	$3.45Bn
3	PRIMECAP MANAGEMENT CO/CA/	0000763212	15,154,606	10.26%	▲396,999	+2.69%	$3.27Bn
4	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	9,651,117	6.53%	▲113,700	+1.19%	$2.09Bn
5	State Street Corp	0000093751	7,344,327	4.97%	▲176,405	+2.46%	$1.59Bn
6	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	6,604,936	4.47%	▲73,209	+1.12%	$1.43Bn
7	GEODE CAPITAL MANAGEMENT, LLC	0001214717	4,449,295	3.01%	▲106,693	+2.46%	$957.94Mn
8	WELLINGTON MANAGEMENT GROUP LLP	0000902219	3,117,469	2.11%	▲155,828	+5.26%	$673.56Mn
9	NORGES BANK	0001374170	2,580,033	1.75%	▲2,580,033	0.00%	$557.44Mn
10	Morgan Stanley	0000895421	2,411,271	1.63%	▲240,331	+11.07%	$520.98Mn
11	AQR CAPITAL MANAGEMENT LLC	0001167557	1,936,859	1.31%	▲13,302	+0.69%	$416.93Mn
12	Jpmorgan Chase & Co	0000019617	1,823,140	1.23%	▼192,869	-9.57%	$394.95Mn
13	Invesco Ltd.	0000914208	1,803,944	1.22%	▲58,689	+3.36%	$389.76Mn
14	Amundi	0001330387	1,516,831	1.03%	▲726,004	+91.80%	$327.73Mn
15	Legal & General Group Plc	0000764068	1,493,289	1.01%	▲143,457	+10.63%	$322.64Mn
16	Northern Trust Corp	0000073124	1,429,490	0.97%	▼17,089	-1.18%	$308.86Mn
17	Boston Partners	0001386060	1,263,429	0.86%	▼436,649	-25.68%	$272.85Mn
18	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	0000861177	1,255,168	0.85%	▼122,400	-8.89%	$271.19Mn
19	Goldman Sachs Group Inc	0000886982	1,230,390	0.83%	▲179,296	+17.06%	$265.84Mn
20	DIMENSIONAL FUND ADVISORS LP	0000354204	1,148,568	0.78%	▲69,449	+6.44%	$248.17Mn

Showing 1 to 20 of 1,033 holders