BIOGEN INC. (BIIB) — Institutional Holders, Q2 2026

1,048 institutional investment managers reported a BIIB position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $30.7B. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.

← BIIB stock profile

BIIB in Q2 2026: what funds did

Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.

New positions

113

Added to

424

Trimmed

298

Sold out

Biggest buyers

FMRAdded · +5,409,698 sh+$1.2B
Pacer AdvisorsNew · +1,122,981 sh+$242.6M
AmundiAdded · +726,004 sh+$156.9M
UBS Group AGAdded · +506,700 sh+$109.5M
PRIMECAP MANAGEMENTAdded · +396,999 sh+$85.8M

Biggest sellers

T. Rowe Price Investment ManagementTrimmed · -1,047,116 sh-$226.2M
VAN ECK ASSOCIATESTrimmed · -981,752 sh-$212.1M
Point72 Asset Management, L.P.Trimmed · -721,468 sh-$155.9M
Boston PartnersTrimmed · -436,649 sh-$94.3M
BALYASNY ASSET MANAGEMENT L.P.Trimmed · -384,956 sh-$83.2M

BIIB 13F holders ranked 1–100 of 1,048

Institutional investors reporting a position in BIOGEN INC. on SEC Form 13F-HR for Q2 2026, ranked by reported value.
#	Institution	Shares	Value	% of portfolio	QoQShares vs Q1 2026
1	FMR#1 · 18,217,239 sh	18,217,239	$3.9B	0.17%	+42.2%
2	BlackRock#2 · 15,985,736 sh	15,985,736	$3.5B	0.05%	+0.1%
3	PRIMECAP MANAGEMENT#3 · 15,154,606 sh	15,154,606	$3.3B	1.94%	+2.7%
4	VANGUARD CAPITAL MANAGEMENT#4 · 9,651,117 sh	9,651,117	$2.1B	0.04%	+1.2%
5	STATE STREET#5 · 7,344,327 sh	7,344,327	$1.6B	0.05%	+2.5%
6	VANGUARD PORTFOLIO MANAGEMENT#6 · 6,604,936 sh	6,604,936	$1.4B	0.06%	+1.1%
7	GEODE CAPITAL MANAGEMENT#7 · 4,449,295 sh	4,449,295	$957.9M	0.05%	+2.5%
8	WELLINGTON MANAGEMENT GROUP LLP#8 · 3,117,469 sh	3,117,469	$673.6M	0.12%	+5.3%
9	NORGES BANK#9 · 2,580,033 sh	2,580,033	$557.4M	0.06%	—
10	MORGAN STANLEY#10 · 2,411,271 sh	2,411,271	$521.0M	0.03%	+11.1%
11	AQR CAPITAL MANAGEMENT#11 · 1,936,859 sh	1,936,859	$416.9M	0.15%	+0.7%
12	JPMORGAN CHASE#12 · 1,823,140 sh	1,823,140	$394.9M	0.02%	-9.6%
13	Invesco Ltd.#13 · 1,803,944 sh	1,803,944	$389.8M	0.03%	+3.4%
14	Amundi#14 · 1,516,831 sh	1,516,831	$327.7M	0.08%	+91.8%
15	Legal & General Group Plc#15 · 1,493,289 sh	1,493,289	$322.6M	0.07%	+10.6%
16	NORTHERN#16 · 1,429,490 sh	1,429,490	$308.9M	0.04%	-1.2%
17	Boston Partners#17 · 1,263,429 sh	1,263,429	$272.8M	0.24%	-25.7%
18	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME#18 · 1,255,168 sh	1,255,168	$271.2M	0.05%	-8.9%
19	GOLDMAN SACHS GROUP#19 · 1,230,390 sh	1,230,390	$265.8M	0.02%	+17.1%
20	DIMENSIONAL FUND ADVISORS#20 · 1,148,568 sh	1,148,568	$248.2M	0.04%	+6.4%
21	Pacer Advisors#21 · 1,122,981 sh	1,122,981	$242.6M	0.62%	+250.9%
22	CHARLES SCHWAB INVESTMENT MANAGEMENT#22 · 1,117,663 sh	1,117,663	$241.5M	0.03%	-2.8%
23	BANK OF AMERICA#23 · 1,116,228 sh	1,116,228	$241.2M	0.02%	-3.5%
24	UBS Group AG#24 · 1,030,150 sh	1,030,150	$222.6M	0.03%	+96.8%
25	Alyeska Investment Group, L.P.#25 · 932,374 sh	932,374	$201.4M	0.52%	+15.8%
26	DEUTSCHE BANK AG\#26 · 894,035 sh	894,035	$193.2M	0.06%	-16.0%
27	Pictet Asset Management Holding SA#27 · 851,819 sh	851,819	$184.1M	0.18%	-6.7%
28	VANGUARD FIDUCIARY#28 · 829,318 sh	829,318	$179.2M	0.04%	+0.5%
29	Robeco Institutional Asset Management B.V.#29 · 791,092 sh	791,092	$170.9M	—	+3.7%
30	FRED ALGER MANAGEMENT#30 · 788,307 sh	788,307	$170.3M	0.57%	+7.5%
31	PRICE T ROWE ASSOCIATES#31 · 774,283 sh	774,283	$167.3M	0.02%	+15.1%
32	Bank of New York Mellon#32 · 773,619 sh	773,619	$167.1M	0.03%	-1.9%
33	MASSACHUSETTS FINANCIAL SERVICES#33 · 744,892 sh	744,892	$163.1M	0.05%	+3.4%
34	CITIGROUP#34 · 734,517 sh	734,517	$158.7M	0.05%	+46.8%
35	ROYAL BANK OF CANADA#35 · 708,562 sh	708,562	$153.1M	0.02%	+33.3%
36	Employees Provident Fund Board#36 · 704,196 sh	704,196	$152.1M	0.87%	0.0%
37	FIRST ADVISORS#37 · 682,021 sh	682,021	$147.4M	0.09%	+1.2%
38	AustralianSuper Pty Ltd#38 · 672,723 sh	672,723	$145.3M	0.63%	+9.2%
39	Artemis Investment Management LLP#39 · 570,974 sh	570,974	$123.4M	—	-0.1%
40	Zurcher Kantonalbank (Zurich Cantonalbank)#40 · 540,001 sh	540,001	$116.7M	0.22%	+3.4%
41	HSBC PLC#41 · 527,866 sh	527,866	$114.0M	0.05%	+13.8%
42	CAISSE DE DEPOT ET PLACEMENT DU QUEBEC#42 · 510,194 sh	510,194	$110.2M	0.16%	-1.6%
43	LSV ASSET MANAGEMENT#43 · 444,049 sh	444,049	$95.9M	0.17%	+33.1%
44	CITADEL ADVISORS#44 · 418,356 sh	418,356	$90.4M	0.01%	+203.0%
45	Swiss National Bank#45 · 413,900 sh	413,900	$89.4M	0.05%	-3.9%
46	National Pension Service#46 · 406,064 sh	406,064	$87.7M	0.06%	+1.1%
47	BNP PARIBAS FINANCIAL MARKETS#47 · 387,542 sh	387,542	$83.7M	0.03%	-17.7%
48	Candriam S.C.A.#48 · 384,326 sh	384,326	$83.0M	0.37%	+0.7%
49	Mitsubishi UFJ Asset Management , Ltd.#49 · 358,823 sh	358,823	$77.5M	0.04%	+7.3%
50	Sumitomo Mitsui#50 · 346,617 sh	346,617	$74.9M	0.04%	-2.7%
51	VICTORY CAPITAL MANAGEMENT#51 · 343,419 sh	343,419	$74.2M	0.04%	+7.1%
52	FIL Ltd#52 · 342,623 sh	342,623	$74.0M	0.05%	+7.7%
53	Fisher Asset Management#53 · 338,018 sh	338,018	$73.0M	0.02%	+8.1%
54	Vanguard Global Advisers#54 · 335,936 sh	335,936	$72.6M	0.03%	-2.3%
55	CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM#55 · 329,106 sh	329,106	$71.1M	0.04%	-3.5%
56	Swedbank AB#56 · 320,622 sh	320,622	$69.3M	0.06%	+10.6%
57	Nuveen#57 · 317,204 sh	317,204	$68.5M	0.02%	-11.6%
58	VANGUARD ASSET MANAGEMENT, Ltd#58 · 284,376 sh	284,376	$61.4M	0.04%	+13.9%
59	Patient Capital Management#59 · 283,697 sh	283,697	$61.3M	2.01%	-25.3%
60	Gotham Asset Management#60 · 279,900 sh	279,900	$60.5M	0.14%	-6.2%
61	KBC Group NV#61 · 278,652 sh	278,652	$60.2M	—	+18.7%
62	CAUSEWAY CAPITAL MANAGEMENT#62 · 278,283 sh	278,283	$60.1M	0.65%	-0.9%
63	PERCEPTIVE ADVISORS#63 · 276,173 sh	276,173	$59.7M	0.90%	New
64	BALYASNY ASSET MANAGEMENT L.P.#64 · 265,090 sh	265,090	$57.3M	0.07%	-59.2%
65	RHUMBLINE ADVISERS#65 · 262,979 sh	262,979	$56.8M	0.04%	-4.5%
66	BARCLAYS PLC#66 · 247,157 sh	247,157	$53.4M	0.01%	-55.2%
67	VOYA INVESTMENT MANAGEMENT#67 · 246,782 sh	246,782	$53.3M	0.05%	+352.3%
68	AEGON ASSET MANAGEMENT UK PLC#68 · 241,101 sh	241,101	$52.1M	0.56%	-6.8%
69	BNP Paribas Asset Management Holding S.A.#69 · 234,138 sh	234,138	$50.6M	0.05%	+8.7%
70	KLP KAPITALFORVALTNING AS#70 · 199,177 sh	199,177	$43.0M	0.14%	0.0%
71	Man Group plc#71 · 196,222 sh	196,222	$42.4M	0.07%	-38.4%
72	PANAGORA ASSET MANAGEMENT#72 · 186,929 sh	186,929	$40.4M	0.12%	+31.6%
73	NISSAY ASSET MANAGEMENT /JAPAN#73 · 185,301 sh	185,301	$40.0M	0.17%	+522.6%
74	PRINCIPAL FINANCIAL GROUP#74 · 184,450 sh	184,450	$39.9M	0.02%	-1.4%
75	ALLIANCEBERNSTEIN L.P.#75 · 214,975 sh	214,975	$39.4M	0.01%	+1.0%
76	JUPITER ASSET MANAGEMENT LTD#76 · 160,057 sh	160,057	$34.6M	0.17%	+2141.4%
77	Quantinno Capital Management#77 · 151,977 sh	151,977	$32.8M	0.04%	+30.6%
78	Allianz Asset Management GmbH#78 · 178,012 sh	178,012	$32.7M	0.03%	0.0%
79	Treasurer of the State of North Carolina#79 · 148,629 sh	148,629	$32.1M	0.08%	+97.7%
80	LETKO, BROSSEAU & ASSOCIATES#80 · 146,562 sh	146,562	$31.7M	0.47%	-2.9%
81	Portolan Capital Management#81 · 142,856 sh	142,856	$30.9M	1.16%	+20.6%
82	Palo Alto Investors#82 · 140,279 sh	140,279	$30.3M	4.19%	-0.3%
83	Walleye Trading#83 · 139,253 sh	139,253	$30.1M	0.03%	+39.9%
84	Creative Planning#84 · 138,613 sh	138,613	$29.9M	0.02%	+18.2%
85	O'SHAUGHNESSY ASSET MANAGEMENT#85 · 138,260 sh	138,260	$29.9M	0.14%	-2.2%
86	FRANKLIN RESOURCES#86 · 137,436 sh	137,436	$29.7M	<0.01%	-4.9%
87	Nippon Life Global Investors Americas#87 · 137,220 sh	137,220	$29.6M	1.18%	+308.8%
88	Russell Investments Group, Ltd.#88 · 133,894 sh	133,894	$29.0M	0.03%	-1.4%
89	IEQ CAPITAL#89 · 132,142 sh	132,142	$28.6M	0.13%	-13.1%
90	THOMPSON SIEGEL & WALMSLEY#90 · 130,512 sh	130,512	$28.2M	0.51%	-47.4%
91	LORD, ABBETT#91 · 130,184 sh	130,184	$28.1M	0.08%	New
92	ACADIAN ASSET MANAGEMENT#92 · 129,878 sh	129,878	$28.1M	0.03%	-47.7%
93	ADAGE CAPITAL PARTNERS GP, L.L.C.#93 · 129,599 sh	129,599	$28.0M	0.04%	-61.1%
94	WELLS FARGO & COMPANY#94 · 128,664 sh	128,664	$27.8M	<0.01%	+1.2%
95	abrdn plc#95 · 128,227 sh	128,227	$27.7M	0.04%	-15.2%
96	BANK OF MONTREAL#96 · 124,267 sh	124,267	$26.8M	<0.01%	+34.0%
97	GREAT WEST LIFE ASSURANCE#97 · 122,258 sh	122,258	$26.4M	0.04%	+0.4%
98	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM#98 · 121,311 sh	121,311	$26.2M	0.04%	-2.3%
99	AMERICAN CENTURY COMPANIES#99 · 114,152 sh	114,152	$24.7M	0.01%	+8.9%
100	T. Rowe Price Investment Management#100 · 113,873 sh	113,873	$24.6M	0.02%	-90.2%

Funds that sold out of BIIB in Q2 2026 (84)

Held BIIB at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.

Institutions that held BIIB in Q1 2026 and reported no position in Q2 2026.
Institution	Shares sold	Value in Q1 2026
Sofinnova Ventures229,521 sh	229,521	$42.1M
Qube Research & Technologies Ltd212,921 sh	212,921	$39.0M
Logos Global Management200,000 sh	200,000	$36.7M
Defilade Capital Management, L.P.96,289 sh	96,289	$17.7M
MILLENNIUM MANAGEMENT93,964 sh	93,964	$17.2M
GLENVIEW CAPITAL MANAGEMENT57,019 sh	57,019	$10.5M
Schonfeld Strategic Advisors48,828 sh	48,828	$9.0M
TANG CAPITAL MANAGEMENT35,000 sh	35,000	$6.4M
Impax Asset Management Group plc28,728 sh	28,728	$5.3M
Atom Investors24,749 sh	24,749	$4.5M
Munich Reinsurance Stock in Munich23,942 sh	23,942	$4.4M
DARK FOREST CAPITAL MANAGEMENT15,736 sh	15,736	$2.9M
DYMON ASIA CAPITAL (SINGAPORE) PTE. LTD.15,000 sh	15,000	$2.7M
BOOTHBAY FUND MANAGEMENT14,268 sh	14,268	$2.6M
EVOKE WEALTH13,831 sh	13,831	$2.5M
Graham Capital Management, L.P.10,342 sh	10,342	$1.9M
GFS Advisors23,915 sh	23,915	$1.9M
Farringdon Capital, Ltd.9,054 sh	9,054	$1.7M
SCOTIA CAPITAL6,274 sh	6,274	$1.2M
Bridgefront Capital6,010 sh	6,010	$1.1M
Friedenthal Financial5,930 sh	5,930	$1.1M
SEGALL BRYANT & HAMILL5,379 sh	5,379	$1.0M
Burns Matteson Capital Management3,818 sh	3,818	$700.0K
WINTON GROUP Ltd3,297 sh	3,297	$604.4K
iSAM Funds (UK) Ltd2,916 sh	2,916	$534.6K
PDT Partners2,348 sh	2,348	$430.5K
Quantitative Investment Management2,255 sh	2,255	$413.0K
Persistent Asset Partners Ltd1,903 sh	1,903	$348.9K
Brand Asset Management Group1,814 sh	1,814	$332.6K
STEVENS CAPITAL MANAGEMENT1,774 sh	1,774	$325.0K
EARNED WEALTH ADVISORS1,561 sh	1,561	$286.2K
Engineers Gate Manager1,558 sh	1,558	$285.6K
SIH Partners, LLLP1,463 sh	1,463	$268.2K
WELLINGTON-ALTUS USA1,219 sh	1,219	$263.4K
GTS SECURITIES1,381 sh	1,381	$253.2K
TWO SIGMA SECURITIES1,335 sh	1,335	$244.7K
DRW Securities1,335 sh	1,335	$244.5K
Collaborative Fund Advisors1,327 sh	1,327	$243.3K
WMS Group1,311 sh	1,311	$240.3K
PATTON FUND MANAGEMENT1,244 sh	1,244	$228.1K
Alphadyne Asset Management1,218 sh	1,218	$223.3K
Analyst IMS Investment Management Services Ltd.1,208 sh	1,208	$221.0K
Aaron Wealth Advisors1,185 sh	1,185	$217.2K
Tradewinds1,129 sh	1,129	$211.2K
Poehling Capital Management1,144 sh	1,144	$209.7K
SAPIENT CAPITAL1,143 sh	1,143	$209.5K
TWINBEECH CAPITAL1,100 sh	1,100	$201.7K
Steward Partners Investment Advisory892 sh	892	$163.5K
Root Financial Partners341 sh	341	$62.5K
TopTier Wealth Management336 sh	336	$61.6K
Vermillion Wealth Management310 sh	310	$56.8K
Aster Capital Management (DIFC) Ltd398 sh	398	$54.5K
Opal Wealth Advisors256 sh	256	$46.9K
WFA of San Diego251 sh	251	$46.0K
Wall Street Financial Group224 sh	224	$41.1K
Intentional Wealth Strategies198 sh	198	$36.3K
TWIN PEAKS WEALTH ADVISORS127 sh	127	$23.3K
SMA Capital120 sh	120	$22.0K
Destiny Wealth Partners105 sh	105	$19.3K
Clayton Financial Group97 sh	97	$17.8K
SWISS RE LTD90 sh	90	$16.5K
Hara Capital84 sh	84	$15.4K
STANCE CAPITAL81 sh	81	$14.8K
Golden State Equity Partners70 sh	70	$12.8K
Wealth Preservation Advisors70 sh	70	$12.8K
Timothy G. Youngquist 2020 Irrevocable52 sh	52	$9.5K
Financial Freedom50 sh	50	$9.2K
Bank Julius Baer & Ltd, Zurich40 sh	40	$7.3K
Optiver Holding B.V.39 sh	39	$7.2K
WEBSTER BANK, N. A.36 sh	36	$6.6K
Harvest Fund Management , Ltd24 sh	24	$4.0K
Truvestments Capital19 sh	19	$3.5K
Whipplewood Advisors19 sh	19	$3.5K
Lloyd Advisory Services15 sh	15	$2.8K
Kingdom Financial Group15 sh	15	$2.8K
First Pacific Financial14 sh	14	$2.6K
Operose Advisors8 sh	8	$1.5K
Sunrise Financial Services8 sh	8	$1.5K
Sound Income Strategies6 sh	6	$1.1K
Retirement Wealth Solutions4 sh	4	$734.00
CURIO WEALTH4 sh	4	$733.00
COUNTRY BANK2 sh	2	$367.00
Rachor Investment Advisory Services1 sh	1	$184.00
Portus Wealth Advisors1 sh	1	$183.00

Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.