Who holds ticker verified against the SEC company list on 2026-09-10 — a reviewed name-and-class mapping row, never an inferred symbol. how tickers are mapped ↗

BIOGEN INC · common stock · Q1 2026 · 27 members disclosed BIIB ↗

13F filers reporting this class for the quarter ended 2026-03-31; 1–500 of 788 holders are listed, largest first: 788
sum of the reported values across every holder; undisclosed values are left out, never counted as zero: $22.6B
holders whose share count rose or who opened the position (new + add), by shares: 413
holders absent this quarter after holding last quarter — inferred from absence, not a sale record: 101

Holders — quarter ended 2026-03-31

by reported value · Δ shares vs 2025-12-31Holders rank by reported value. The change kind — new, add, trim or exit — is read from the share count against the prior quarter, never from the reported value.

13F holders of BIIB ranked by reported value, 1–25 of 788 holders
#	Filer	Reported value	Shares	Δ shares	Change
1	BlackRock, Inc.	$2.9B	15,974,601	+1,163,231	ADD
2	PRIMECAP MANAGEMENT CO/CA/	$2.7B	14,757,607	−390	TRIM
3	FMR LLC	$2.3B	12,807,541	+3,381,678	ADD
4	VANGUARD CAPITAL MANAGEMENT LLC	$1.7B	9,537,417	—	NO PRIOR
5	STATE STREET CORP	$1.3B	7,167,922	+8,902	ADD
6	VANGUARD PORTFOLIO MANAGEMENT LLC	$1.2B	6,531,727	—	NO PRIOR
7	GEODE CAPITAL MANAGEMENT, LLC	$793M	4,342,602	+143,203	ADD
8	WELLINGTON MANAGEMENT GROUP LLP	$543M	2,961,641	−589,628	TRIM
9	MORGAN STANLEY	$398M	2,170,940	−154,073	TRIM
10	AQR CAPITAL MANAGEMENT LLC	$346M	1,923,557	+394,941	ADD
11	Invesco Ltd.	$320M	1,745,255	+89,814	ADD
12	Boston Partners	$312M	1,700,078	−20,517	TRIM
13	NORTHERN TRUST CORP	$265M	1,446,579	+453	ADD
14	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	$253M	1,377,568	−13,802	TRIM
15	Legal & General Group Plc	$247M	1,349,832	−109,765	TRIM
16	BANK OF AMERICA CORP /DE/	$212M	1,156,369	+27,524	ADD
17	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	$211M	1,149,394	+5,492	ADD
18	DIMENSIONAL FUND ADVISORS LP	$198M	1,079,119	+118,474	ADD
19	DEUTSCHE BANK AG\	$195M	1,063,828	+110,100	ADD
20	Pictet Asset Management Holding SA	$168M	913,328	−34,166	TRIM
21	VANGUARD FIDUCIARY TRUST CO	$151M	825,531	—	NO PRIOR
22	Point72 Asset Management, L.P.	$148M	809,617	−2,003,575	TRIM
23	Alyeska Investment Group, L.P.	$148M	805,050	−219,218	TRIM
24	Amundi	$145M	790,827	+218,398	ADD
25	Bank of New York Mellon Corp	$145M	788,523	−22,583	TRIM

Show the top 500 of 788 holders

13F holders of BIIB ranked by reported value, 26–500 of 788 holders
#	Filer	Reported value	Shares	Δ shares	Change
26	Robeco Institutional Asset Management B.V.	$140M	763,174	+152,266	ADD
27	MASSACHUSETTS FINANCIAL SERVICES CO /MA/	$134M	720,629	+8,070	ADD
28	Employees Provident Fund Board	$129M	704,196	0	NO CHANGE
29	FIRST TRUST ADVISORS LP	$124M	673,958	+108,111	ADD
30	BALYASNY ASSET MANAGEMENT L.P.	$119M	650,046	+42,093	ADD
31	AustralianSuper Pty Ltd	$113M	616,193	+139,381	ADD
32	Artemis Investment Management LLP	$105M	571,571	+344,726	ADD
33	BARCLAYS PLC	$101M	551,474	−753,533	TRIM
34	ROYAL BANK OF CANADA	$97.4M	531,377	−10,448	TRIM
35	UBS Group AG	$96.0M	523,450	−118,338	TRIM
36	Zurcher Kantonalbank (Zurich Cantonalbank)	$95.7M	522,155	+69,713	ADD
37	CAISSE DE DEPOT ET PLACEMENT DU QUEBEC	$95.1M	518,694	−69,851	TRIM
38	CITIGROUP INC	$91.8M	500,507	−73,337	TRIM
39	HSBC HOLDINGS PLC	$84.6M	463,652	−544,012	TRIM
40	Swiss National Bank	$78.9M	430,600	+28,800	ADD
41	National Pension Service	$73.6M	401,667	+401,667	NEW
42	Candriam S.C.A.	$70.0M	381,768	+51,296	ADD
43	Patient Capital Management, LLC	$69.6M	379,741	−196,611	TRIM
44	Nuveen, LLC	$65.8M	358,838	−16,719	TRIM
45	Sumitomo Mitsui Trust Group, Inc.	$65.3M	356,291	−14,336	TRIM
46	Vanguard Global Advisers, LLC	$63.0M	343,768	—	NO PRIOR
47	CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM	$62.5M	340,903	+10,097	ADD
48	Mitsubishi UFJ Asset Management Co., Ltd.	$61.3M	334,413	+14,504	ADD
49	ADAGE CAPITAL PARTNERS GP, L.L.C.	$61.1M	333,457	+39,100	ADD
50	VICTORY CAPITAL MANAGEMENT INC	$58.8M	320,785	+74,135	ADD
51	Man Group plc	$58.4M	318,745	−20,539	TRIM
52	FIL Ltd	$58.3M	318,056	−1,488	TRIM
53	Fisher Asset Management, LLC	$57.3M	312,618	+19,349	ADD
54	Gotham Asset Management, LLC	$54.7M	298,437	+21,628	ADD
55	Swedbank AB	$53.1M	289,840	+58,231	ADD
56	CAUSEWAY CAPITAL MANAGEMENT LLC	$51.5M	280,783	−240,318	TRIM
57	RHUMBLINE ADVISERS	$50.5M	275,438	+3,692	ADD
58	VANGUARD ASSET MANAGEMENT, Ltd	$45.8M	249,778	—	NO PRIOR
59	Sofinnova Investments, Inc.	$42.1M	229,521	+229,521	NEW
60	BNP Paribas Asset Management Holding S.A.	$39.5M	215,436	−30,244	TRIM
61	Qube Research & Technologies Ltd	$39.0M	212,921	+212,921	NEW
62	ALLIANCEBERNSTEIN L.P.	$37.5M	212,897	+29,153	ADD
63	RENAISSANCE TECHNOLOGIES LLC	$37.3M	203,396	−195,800	TRIM
64	Hudson Bay Capital Management LP	$36.9M	201,367	−20,493	TRIM
65	Logos Global Management LP	$36.7M	200,000	0	NO CHANGE
66	KLP KAPITALFORVALTNING AS	$36.5M	199,177	+7,500	ADD
67	PRINCIPAL FINANCIAL GROUP INC	$34.3M	187,059	+2,870	ADD
68	Allianz Asset Management GmbH	$32.6M	178,049	−69,673	TRIM
69	IEQ CAPITAL, LLC	$27.9M	152,076	+12,437	ADD
70	ExodusPoint Capital Management, LP	$27.9M	151,993	+151,993	NEW
71	Aberdeen Group plc	$27.7M	151,144	+11,266	ADD
72	LETKO, BROSSEAU & ASSOCIATES INC	$27.7M	150,865	+21,085	ADD
73	FRANKLIN RESOURCES INC	$26.5M	144,448	+3,074	ADD
74	PANAGORA ASSET MANAGEMENT INC	$26.0M	142,065	+138,862	ADD
75	O'SHAUGHNESSY ASSET MANAGEMENT, LLC	$25.9M	141,324	+31,056	ADD
76	Palo Alto Investors LP	$25.8M	140,719	+140,719	NEW
77	SUSQUEHANNA INTERNATIONAL GROUP, LLP	$25.7M	140,299	−521,385	TRIM
78	CITADEL ADVISORS LLC	$25.3M	138,093	+97,669	ADD
79	AMERIPRISE FINANCIAL INC	$24.3M	132,603	+842	ADD
80	Eurizon Capital SGR S.p.A.	$23.7M	129,204	−1,609	TRIM
81	TD ASSET MANAGEMENT INC	$23.3M	127,268	−8,084	TRIM
82	WELLS FARGO & COMPANY/MN	$23.3M	127,134	+7,796	ADD
83	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM	$22.8M	124,212	−1,538	TRIM
84	Portolan Capital Management, LLC	$21.7M	118,481	+33,491	ADD
85	Creative Planning	$21.5M	117,236	+27,234	ADD
86	Quantinno Capital Management LP	$21.3M	116,374	+18,041	ADD
87	LMR Partners LLP	$21.3M	116,131	+107,501	ADD
88	CANADA PENSION PLAN INVESTMENT BOARD	$21.1M	114,938	−23,140	TRIM
89	Susquehanna Portfolio Strategies, LLC	$20.5M	111,830	+5,716	ADD
90	Rhenman & Partners Asset Management AB	$20.0M	109,100	+16,750	ADD
91	Woodline Partners LP	$20.0M	109,032	+6,714	ADD
92	AMERICAN CENTURY COMPANIES INC	$19.2M	104,783	+18,959	ADD
93	ADAMS DIVERSIFIED EQUITY FUND, INC.	$18.4M	100,300	+56,000	ADD
94	NEW YORK STATE COMMON RETIREMENT FUND	$18.3M	99,845	+600	ADD
95	Walleye Trading LLC	$18.2M	99,532	+4,010	ADD
96	FEDERATED HERMES, INC.	$17.8M	97,279	−33,889	TRIM
97	AVIVA PLC	$17.8M	96,864	−28,034	TRIM
98	RAYMOND JAMES FINANCIAL INC	$17.7M	96,699	+12,985	ADD
99	Defilade Capital Management, L.P.	$17.7M	96,289	−65,703	TRIM
100	MANUFACTURERS LIFE INSURANCE COMPANY, THE	$17.4M	95,108	−10,628	TRIM
101	MILLENNIUM MANAGEMENT LLC	$17.2M	93,964	−1,031,622	TRIM
102	BANK OF MONTREAL /CAN/	$17.0M	92,709	−20,975	TRIM
103	SPHERA FUNDS MANAGEMENT LTD.	$17.0M	92,526	−2,212	TRIM
104	SECTOR GAMMA AS	$16.5M	90,096	+4,621	ADD
105	Illinois Municipal Retirement Fund	$16.4M	89,303	+7,905	ADD
106	LPL Financial LLC	$15.0M	81,720	−7,817	TRIM
107	NATIONAL BANK OF CANADA /FI/	$14.5M	78,880	−17,662	TRIM
108	STATE OF WISCONSIN INVESTMENT BOARD	$14.4M	78,564	+2,620	ADD
109	Cerity Partners LLC	$14.1M	76,644	+8,278	ADD
110	Korea Investment CORP	$13.6M	73,988	+20,081	ADD
111	Vanguard Investments Australia, Ltd.	$13.4M	73,268	—	NO PRIOR
112	APG Asset Management N.V.	$13.4M	84,047	−11,025	TRIM
113	Chevy Chase Trust Holdings, LLC	$13.3M	72,645	−2,079	TRIM
114	Mariner, LLC	$13.2M	72,036	+19,561	ADD
115	SEI INVESTMENTS CO	$13.1M	71,513	+12,017	ADD
116	MACKENZIE FINANCIAL CORP	$13.1M	71,432	+357	ADD
117	Universal- Beteiligungs- und Servicegesellschaft mbH	$12.6M	68,243	−55,493	TRIM
118	Cresset Asset Management, LLC	$12.4M	67,503	−8,876	TRIM
119	BANQUE PICTET & CIE SA	$12.1M	66,061	−5,297	TRIM
120	Mitsubishi UFJ Trust & Banking Corp	$11.9M	65,094	−224	TRIM
121	ENVESTNET ASSET MANAGEMENT INC	$11.9M	64,693	+5,874	ADD
122	ROYAL LONDON ASSET MANAGEMENT LTD	$11.8M	64,266	−299	TRIM
123	Asset Management One Co., Ltd.	$11.8M	64,100	−3,353	TRIM
124	NOMURA ASSET MANAGEMENT CO LTD	$11.5M	62,978	−4,373	TRIM
125	ORBIMED ADVISORS LLC	$11.3M	61,600	+61,600	NEW
126	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	$11.1M	60,776	+2,940	ADD
127	Integral Health Asset Management, LLC	$11.0M	60,000	−40,000	TRIM
128	Tidal Investments LLC	$10.9M	58,586	+28,108	ADD
129	SCHRODER INVESTMENT MANAGEMENT GROUP	$10.8M	58,828	+1,556	ADD
130	GLENVIEW CAPITAL MANAGEMENT, LLC	$10.5M	57,019	−233,586	TRIM
131	EDMOND DE ROTHSCHILD HOLDING S.A.	$10.4M	56,970	−10,000	TRIM
132	CWM, LLC	$10.1M	55,175	+6,285	ADD
133	VOYA INVESTMENT MANAGEMENT LLC	$10.0M	54,561	−8,134	TRIM
134	Andra AP-fonden	$9.5M	52,000	+49,500	ADD
135	SILVERARC CAPITAL MANAGEMENT, LLC	$9.3M	50,967	−24,445	TRIM
136	GATEWAY INVESTMENT ADVISERS LLC	$9.3M	50,923	+2,762	ADD
137	State of New Jersey Common Pension Fund D	$9.2M	50,137	+1,192	ADD
138	HighTower Advisors, LLC	$9.1M	49,851	+37,892	ADD
139	Schonfeld Strategic Advisors LLC	$9.0M	48,828	−58,240	TRIM
140	Lansforsakringar Fondforvaltning AB (publ)	$8.8M	47,807	−918	TRIM
141	DANSKE BANK A/S	$8.7M	47,417	−998	TRIM
142	NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	$8.7M	47,333	+47,333	NEW
143	Ethic Inc.	$8.7M	47,293	−1,298	TRIM
144	Resona Asset Management Co.,Ltd.	$8.5M	46,261	+1,075	ADD
145	Tredje AP-fonden	$8.5M	46,370	+46,370	NEW
146	PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO	$8.4M	46,062	−1,308	TRIM
147	Dakota Wealth Management	$8.4M	45,587	−310	TRIM
148	CONTRAVISORY INVESTMENT MANAGEMENT, INC.	$8.2M	44,677	+44,677	NEW
149	Privium Fund Management B.V.	$8.0M	43,800	−29,680	TRIM
150	Generali Investments CEE, investicni spolecnost, a.s.	$8.0M	43,552	0	NO CHANGE
151	TORONTO DOMINION BANK	$8.0M	43,371	−5,802	TRIM
152	STATE OF MICHIGAN RETIREMENT SYSTEM	$7.9M	43,003	−100	TRIM
153	BANCO BILBAO VIZCAYA ARGENTARIA, S.A.	$7.8M	42,471	−104,480	TRIM
154	CIBC Bancorp USA Inc.	$7.7M	41,902	—	NO PRIOR
155	SEB Asset Management AB	$7.7M	41,869	—	NO PRIOR
156	OSSIAM	$7.5M	40,960	−21,303	TRIM
157	STIFEL FINANCIAL CORP	$7.5M	40,938	−10,308	TRIM
158	Mirae Asset Global Investments Co., Ltd.	$7.4M	40,238	+5,131	ADD
159	Czech National Bank	$7.3M	39,969	+1,286	ADD
160	Arizona State Retirement System	$7.3M	39,863	−357	TRIM
161	Orion Investment Co	$7.3M	39,610	+206	ADD
162	FJARDE AP-FONDEN /FOURTH SWEDISH NATIONAL PENSION FUND	$7.2M	39,303	+12,750	ADD
163	MERCER GLOBAL ADVISORS INC /ADV	$7.1M	38,600	−3,875	TRIM
164	IFM Investors Pty Ltd	$7.1M	38,521	−1,334	TRIM
165	USS Investment Management Ltd	$6.8M	37,217	+3,001	ADD
166	Corient Private Wealth LLC	$6.7M	36,952	−50,515	TRIM
167	MARTINGALE ASSET MANAGEMENT L P	$6.7M	36,735	+36,735	NEW
168	Vanguard Personalized Indexing Management, LLC	$6.7M	36,413	−2,180	TRIM
169	WEALTH ENHANCEMENT ADVISORY SERVICES, LLC	$6.7M	62,530	+24,582	ADD
170	Squarepoint Ops LLC	$6.6M	36,053	−110,355	TRIM
171	ProShare Advisors LLC	$6.6M	35,926	−5,570	TRIM
172	NISA INVESTMENT ADVISORS, LLC	$6.6M	35,820	−2,615	TRIM
173	Calamos Advisors LLC	$6.5M	35,527	0	NO CHANGE
174	Walleye Capital LLC	$6.5M	35,339	+33,764	ADD
175	CIBC Asset Management Inc	$6.5M	35,196	+749	ADD
176	Rafferty Asset Management, LLC	$6.4M	35,018	−13,541	TRIM
177	TANG CAPITAL MANAGEMENT LLC	$6.4M	35,000	0	NO CHANGE
178	RITHOLTZ WEALTH MANAGEMENT	$6.4M	34,943	+6,568	ADD
179	CWA Asset Management Group, LLC	$6.4M	34,830	+2,296	ADD
180	GRIMES & Co WEALTH MANAGEMENT, LLC	$6.4M	34,684	+840	ADD
181	MetLife Investment Management, LLC	$6.3M	34,279	−876	TRIM
182	Generali Asset Management SPA SGR	$6.3M	34,194	+7,013	ADD
183	COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS	$6.3M	34,186	+62	ADD
184	Ensign Peak Advisors, Inc	$6.2M	33,710	+23,034	ADD
185	Nippon Life Global Investors Americas, Inc.	$6.2M	33,570	+7,080	ADD
186	LEUTHOLD GROUP, LLC	$6.1M	33,143	+554	ADD
187	QRG CAPITAL MANAGEMENT, INC.	$6.1M	33,002	+29,207	ADD
188	FIFTH THIRD BANCORP	$6.0M	32,716	+23,504	ADD
189	Lighthouse Investment Partners, LLC	$6.0M	32,632	+26,844	ADD
190	Swiss Life Asset Management Ltd	$5.7M	31,288	+6,092	ADD
191	US BANCORP \DE\	$5.7M	31,223	+4,466	ADD
192	DnB Asset Management AS	$5.7M	31,221	+2,492	ADD
193	Retirement Systems of Alabama	$5.7M	31,166	−44	TRIM
194	Baader Bank Aktiengesellschaft	$5.6M	30,801	−1,690	TRIM
195	NISSAY ASSET MANAGEMENT CORP /JAPAN	$5.5M	29,762	+3,476	ADD
196	B. Metzler seel. Sohn & Co. AG	$5.4M	29,725	−246	TRIM
197	Hillman Capital Management, Inc.	$5.4M	29,540	−976	TRIM
198	Insight Wealth Strategies, LLC	$5.4M	29,346	+386	ADD
199	PEAK6 LLC	$5.2M	28,166	+28,166	NEW
200	Daiwa Securities Group Inc.	$5.0M	27,136	+859	ADD
201	XPONANCE LLC	$4.9M	26,456	+3,418	ADD
202	Leonteq Securities AG	$4.8M	26,454	−1,506	TRIM
203	GUGGENHEIM CAPITAL LLC	$4.8M	26,382	+2,362	ADD
204	Caprock Group, LLC	$4.7M	25,651	+2,198	ADD
205	Atom Investors LP	$4.5M	24,749	+3,029	ADD
206	Old North State Wealth Management, LLC	$4.5M	24,595	+786	ADD
207	NorthCrest Asset Manangement, LLC	$4.4M	25,012	−8,775	TRIM
208	PUBLIC SECTOR PENSION INVESTMENT BOARD	$4.4M	23,792	+4,602	ADD
209	Utah Retirement Systems	$4.3M	23,714	−282	TRIM
210	CREDIT AGRICOLE S A	$4.2M	22,985	−53,790	TRIM
211	DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main	$4.2M	22,926	−1,993	TRIM
212	Leo Wealth, LLC	$4.2M	22,737	+4,604	ADD
213	NATIXIS	$4.1M	22,585	−6,519	TRIM
214	Cetera Investment Advisers	$4.1M	22,444	−1,059	TRIM
215	Rakuten Investment Management, Inc.	$4.1M	21,778	+2,483	ADD
216	NEW YORK LIFE INVESTMENT MANAGEMENT LLC	$4.0M	21,905	+595	ADD
217	Jefferies Financial Group Inc.	$4.0M	21,902	−10,611	TRIM
218	Empowered Funds, LLC	$4.0M	21,775	−36,186	TRIM
219	SummitTX Capital, L.P.	$4.0M	21,656	+21,656	NEW
220	TEACHER RETIREMENT SYSTEM OF TEXAS	$3.9M	21,299	−2,190	TRIM
221	Focus Partners Wealth	$3.9M	20,982	+6,401	ADD
222	NEOS Investment Management LLC	$3.8M	20,840	+4,306	ADD
223	Sumitomo Mitsui DS Asset Management Company, Ltd	$3.8M	20,489	+67	ADD
224	BANK OF NOVA SCOTIA	$3.7M	20,436	−2,259	TRIM
225	BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp	$3.7M	20,217	−5,743	TRIM
226	OMERS ADMINISTRATION Corp	$3.7M	20,149	+3,341	ADD
227	Federation des caisses Desjardins du Quebec	$3.6M	19,581	+7,233	ADD
228	Cinctive Capital Management LP	$3.5M	19,349	−32,824	TRIM
229	Morningstar Investment Management LLC	$3.5M	19,344	+565	ADD
230	Janus Henderson Group Ltd.	$3.5M	18,975	−1,277	TRIM
231	Artia Global Partners LP	$3.4M	18,437	+18,437	NEW
232	COMMONWEALTH EQUITY SERVICES, LLC	$3.3M	18,102	−292	TRIM
233	Kintegral Advisory, LLC	$3.3M	17,946	−796	TRIM
234	Elo Mutual Pension Insurance Co	$3.2M	17,727	+585	ADD
235	MH & ASSOCIATES SECURITIES MANAGEMENT CORP /ADV	$3.2M	17,717	+119	ADD
236	Fieldview Capital Management, LLC	$3.2M	17,659	+3,387	ADD
237	LAZARD ASSET MANAGEMENT LLC	$3.1M	16,935	−29,188	TRIM
238	OREGON PUBLIC EMPLOYEES RETIREMENT FUND	$3.1M	16,841	+100	ADD
239	NOMURA HOLDINGS INC	$3.1M	16,730	−130,531	TRIM
240	SYSTEMATIC FINANCIAL MANAGEMENT LP	$3.0M	16,220	−420	TRIM
241	NORDEA INVESTMENT MANAGEMENT AB	$3.0M	16,586	+2,564	ADD
242	M&T BANK CORP	$2.9M	15,817	−944	TRIM
243	Wealthfront Advisers LLC	$2.9M	15,679	+128	ADD
244	MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC	$2.9M	15,656	−137	TRIM
245	UniSuper Management Pty Ltd	$2.9M	15,572	−855	TRIM
246	CLARK ESTATES INC/NY	$2.8M	15,300	0	NO CHANGE
247	OP Asset Management Ltd	$2.8M	15,263	—	NO PRIOR
248	FULLER & THALER ASSET MANAGEMENT, INC.	$2.8M	15,239	−14,559	TRIM
249	YOUSIF CAPITAL MANAGEMENT, LLC	$2.8M	15,206	−714	TRIM
250	DYMON ASIA CAPITAL (SINGAPORE) PTE. LTD.	$2.7M	15,000	+15,000	NEW
251	Pathstone Holdings, LLC	$2.7M	14,908	+1,100	ADD
252	Avanza Fonder AB	$2.7M	14,621	−122	TRIM
253	BOOTHBAY FUND MANAGEMENT, LLC	$2.6M	14,268	+14,268	NEW
254	EVOKE WEALTH, LLC	$2.5M	13,831	+288	ADD
255	Vontobel Holding Ltd.	$2.5M	13,710	+3,869	ADD
256	Convergence Investment Partners, LLC	$2.5M	13,557	+1,401	ADD
257	NewEdge Advisors, LLC	$2.4M	13,031	+13,031	NEW
258	BLAIR WILLIAM & CO/IL	$2.4M	12,854	+4,411	ADD
259	BEACON INVESTMENT ADVISORY SERVICES, INC.	$2.3M	12,314	−360	TRIM
260	OSAIC HOLDINGS, INC.	$2.2M	12,005	−2,442	TRIM
261	Pallas Capital Advisors LLC	$2.2M	11,963	+180	ADD
262	PROFUND ADVISORS LLC	$2.2M	11,961	−2,239	TRIM
263	TRUIST FINANCIAL CORP	$2.1M	11,566	+159	ADD
264	Merit Financial Group, LLC	$2.1M	11,430	+913	ADD
265	MML INVESTORS SERVICES, LLC	$2.1M	11,340	+3,115	ADD
266	ADAR1 Capital Management, LLC	$2.0M	11,000	−13,300	TRIM
267	Investment Management Corp of Ontario	$1.9M	10,534	−1,808	TRIM
268	JANE STREET GROUP, LLC	$1.9M	10,469	−13,070	TRIM
269	Missouri Trust & Investment Co	$1.9M	10,380	+1,890	ADD
270	Graham Capital Management, L.P.	$1.9M	10,342	+10,342	NEW
271	GFS Advisors, LLC	$1.9M	23,915	+23,915	NEW
272	K.J. Harrison & Partners Inc	$1.8M	10,000	0	NO CHANGE
273	Crossmark Global Holdings, Inc.	$1.8M	9,961	—	NO PRIOR
274	Sequoia Financial Advisors, LLC	$1.8M	9,953	−611	TRIM
275	Pinnacle Financial Partners, Inc.	$1.8M	9,925	−984	TRIM
276	KENNEDY CAPITAL MANAGEMENT LLC	$1.8M	9,808	+805	ADD
277	GREAT LAKES ADVISORS, LLC	$1.7M	9,490	0	NO CHANGE
278	TWO SIGMA INVESTMENTS, LP	$1.7M	9,444	−242,319	TRIM
279	AIA Group Ltd	$1.7M	9,329	+7,054	ADD
280	Norinchukin Bank, The	$1.7M	9,220	+34	ADD
281	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	$1.7M	9,220	−33,522	TRIM
282	Farringdon Capital, Ltd.	$1.7M	9,054	+9,054	NEW
283	Focus Partners Advisor Solutions, LLC	$1.7M	9,011	+1,506	ADD
284	MIZUHO SECURITIES USA LLC	$1.6M	8,872	−1,810	TRIM
285	AUXIER ASSET MANAGEMENT LLC	$1.6M	8,869	−42	TRIM
286	KEYBANK NATIONAL ASSOCIATION/OH	$1.6M	8,834	+416	ADD
287	Sompo Asset Management Co., Ltd.	$1.6M	8,776	+1,200	ADD
288	GROUPAMA ASSET MANAGMENT	$1.6M	8,753	+322	ADD
289	M&G Plc	$1.6M	8,593	0	NO CHANGE
290	MACQUARIE GROUP LTD	$1.6M	8,512	−17,897	TRIM
291	Orion Porfolio Solutions, LLC	$1.6M	8,497	−2,943	TRIM
292	HARTFORD INVESTMENT MANAGEMENT CO	$1.5M	8,401	−100	TRIM
293	AG2R LA MONDIALE GESTION D'ACTIFS	$1.5M	8,375	+111	ADD
294	QUADRANT CAPITAL GROUP LLC	$1.5M	8,168	−496	TRIM
295	Banque Cantonale Vaudoise	$1.5M	7,928	+4,466	ADD
296	Jacobi Capital Management LLC	$1.4M	7,649	−187	TRIM
297	Allspring Global Investments Holdings, LLC	$1.3M	7,322	+36	ADD
298	Brooklyn Investment Group	$1.3M	7,323	+1,621	ADD
299	Krilogy Financial LLC	$1.3M	7,590	−116	TRIM
300	Sigma Planning Corp	$1.3M	7,201	+1,955	ADD
301	JUPITER ASSET MANAGEMENT LTD	$1.3M	7,141	+7,141	NEW
302	Generali Investments, Management Co LLC	$1.3M	7,112	−3,862	TRIM
303	Maryland State Retirement & Pension System	$1.3M	7,095	−286	TRIM
304	COMMERCE BANK	$1.3M	7,074	+696	ADD
305	NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO	$1.3M	7,046	+462	ADD
306	Assenagon Asset Management S.A.	$1.3M	6,969	+769	ADD
307	Kennondale Capital Management LLC	$1.3M	6,967	+4,207	ADD
308	STABLEFORD CAPITAL II LLC	$1.3M	6,904	−10	TRIM
309	Laird Norton Wetherby Trust Company, LLC	$1.3M	6,899	+79	ADD
310	Summit Trail Advisors, LLC	$1.3M	6,886	+1,485	ADD
311	BROWN ADVISORY INC	$1.3M	6,844	−347	TRIM
312	Ascent Group, LLC	$1.3M	6,836	+802	ADD
313	UNITED CAPITAL FINANCIAL ADVISORS, LLC	$1.2M	6,786	+6,786	NEW
314	Rockefeller Capital Management L.P.	$1.2M	6,761	+1,754	ADD
315	North Dakota State Investment Board	$1.2M	6,670	−905	TRIM
316	Osmosis Investment Management UK Ltd	$1.2M	6,652	+17	ADD
317	Kathmere Capital Management, LLC	$1.2M	6,643	+1,852	ADD
318	NICOLET BANKSHARES INC	$1.2M	6,516	+6,516	NEW
319	Callan Family Office, LLC	$1.2M	6,499	−2,496	TRIM
320	Sagewood Asset Management LP	$1.2M	6,493	+594	ADD
321	Savant Capital, LLC	$1.2M	6,479	+2,911	ADD
322	Advisors Asset Management, Inc.	$1.2M	6,431	+219	ADD
323	TOKIO MARINE ASSET MANAGEMENT CO LTD	$1.2M	6,428	+859	ADD
324	Ballentine Partners, LLC	$1.2M	6,350	+45	ADD
325	denkapparat Operations GmbH	$1.2M	6,338	0	NO CHANGE
326	HUSSMAN STRATEGIC ADVISORS, INC.	$1.2M	6,300	+6,300	NEW
327	SCOTIA CAPITAL INC.	$1.2M	6,274	+6,274	NEW
328	MOGY JOEL R INVESTMENT COUNSEL INC	$1.1M	6,260	0	NO CHANGE
329	Mediolanum International Funds Ltd	$1.1M	6,054	+6,054	NEW
330	Metis Global Partners, LLC	$1.1M	6,176	−1,035	TRIM
331	World Investment Advisors	$1.1M	6,082	−657	TRIM
332	MUFG Securities EMEA plc	$1.1M	6,017	0	NO CHANGE
333	Bridgefront Capital, LLC	$1.1M	6,010	+6,010	NEW
334	ABN AMRO INVESTMENT SOLUTIONS	$1.1M	5,976	+1,150	ADD
335	Friedenthal Financial	$1.1M	5,930	+5,930	NEW
336	Kestra Advisory Services, LLC	$1.1M	5,810	+1,301	ADD
337	Dai-ichi Life Insurance Company, Ltd	$1.1M	5,808	−211	TRIM
338	HB Wealth Management, LLC	$1.0M	5,681	+1,011	ADD
339	Sanctuary Advisors, LLC	$1.0M	5,617	+445	ADD
340	SIG BROKERAGE, LP	$1.0M	5,500	−5,422	TRIM
341	GUARDIAN INVESTMENT MANAGEMENT	$1.0M	5,500	+100	ADD
342	Saudi Central Bank	$993K	5,415	+5,415	NEW
343	Wealthcare Advisory Partners LLC	$988K	5,389	+87	ADD
344	E Fund Management Co., Ltd.	$955K	5,209	—	NO PRIOR
345	Vise Technologies, Inc.	$953K	5,415	0	NO CHANGE
346	INDEPENDENT FINANCIAL GROUP, LLC	$953K	5,198	—	NO PRIOR
347	Frank, Rimerman Advisors LLC	$952K	5,194	+12	ADD
348	Annis Gardner Whiting Capital Advisors, LLC	$952K	5,192	+2	ADD
349	Sterling Capital Management LLC	$942K	5,136	−3,525	TRIM
350	Taproot Management LP	$941K	5,133	+5,133	NEW
351	Vident Advisory, LLC	$935K	5,101	+896	ADD
352	Cannell & Spears LLC	$932K	5,083	+4	ADD
353	Unison Advisors LLC	$931K	5,078	0	NO CHANGE
354	Bull Harbor Capital LLC	$931K	5,077	—	NO PRIOR
355	Empirical Finance, LLC	$929K	5,070	−6	TRIM
356	Birchview Capital, LP	$917K	5,000	+5,000	NEW
357	J. Safra Sarasin Holding AG	$915K	4,998	−1,476	TRIM
358	Plato Investment Management Ltd	$906K	4,939	0	NO CHANGE
359	&PARTNERS	$893K	5,037	+752	ADD
360	Virtus Investment Advisers, LLC	$889K	4,848	+925	ADD
361	E. Ohman J:or Asset Management AB	$883K	4,819	−900	TRIM
362	BEESE FULMER INVESTMENT MANAGEMENT, INC.	$881K	4,803	+4,803	NEW
363	Holocene Advisors, LP	$879K	4,793	+4,793	NEW
364	Chicago Partners Investment Group LLC	$874K	4,598	+1,782	ADD
365	SUMMITRY LLC	$868K	4,737	−57	TRIM
366	Meeder Advisory Services, Inc.	$866K	4,721	+57	ADD
367	Arrowpoint Investment Partners (Singapore) Pte. Ltd.	$863K	4,706	+1,851	ADD
368	MAI Capital Management	$862K	4,702	+1,255	ADD
369	NORTHWESTERN MUTUAL INVESTMENT MANAGEMENT COMPANY, LLC	$861K	4,696	+9	ADD
370	COLDSTREAM CAPITAL MANAGEMENT INC	$855K	4,662	−120	TRIM
371	Private Advisor Group, LLC	$852K	4,649	−1,464	TRIM
372	SIGNATUREFD, LLC	$845K	4,608	+238	ADD
373	GILDER GAGNON HOWE & CO LLC	$836K	4,558	+4,558	NEW
374	EFG International AG	$817K	4,457	+1,822	ADD
375	Lido Advisors, LLC	$813K	4,432	−1,559	TRIM
376	TWIN CAPITAL MANAGEMENT INC	$812K	4,430	+4,430	NEW
377	Econ Financial Services Corp	$806K	4,397	+451	ADD
378	LBP AM SA	$801K	4,367	+4,367	NEW
379	TOCQUEVILLE ASSET MANAGEMENT L.P.	$798K	4,352	−1,117	TRIM
380	Jones Kertz & Associates, Inc.	$776K	4,231	−260	TRIM
381	STOREBRAND ASSET MANAGEMENT AS	$774K	4,223	—	NO PRIOR
382	Baird Financial Group, Inc.	$772K	4,213	+4,213	NEW
383	Allworth Financial LP	$772K	4,211	+725	ADD
384	INTECH INVESTMENT MANAGEMENT LLC	$750K	4,092	−1,450	TRIM
385	Beacon Pointe Advisors, LLC	$749K	4,083	+682	ADD
386	MUFG SECURITIES AMERICAS INC.	$745K	4,061	+109	ADD
387	Cohen Klingenstein LLC	$733K	4,000	0	NO CHANGE
388	PINNACLE ASSOCIATES LTD	$733K	3,999	−156	TRIM
389	Texas Yale Capital Corp.	$731K	3,987	0	NO CHANGE
390	SECURIAN ASSET MANAGEMENT, INC	$723K	3,945	0	NO CHANGE
391	FARMERS & MERCHANTS INVESTMENTS INC	$723K	3,941	0	NO CHANGE
392	Lombard Odier Asset Management (Switzerland) SA	$715K	3,899	+3,899	NEW
393	Savvy Advisors, Inc.	$708K	3,864	−385	TRIM
394	AlphaCentric Advisors LLC	$703K	3,835	+208	ADD
395	ELEVATION POINT WEALTH PARTNERS, LLC	$683K	3,724	+3,724	NEW
396	Bellevue Group AG	$670K	3,653	+88	ADD
397	XXI WEALTH, LLC	$669K	3,651	+1,136	ADD
398	Siemens Fonds Invest GmbH	$666K	3,633	+112	ADD
399	Avestar Capital, LLC	$661K	3,604	+69	ADD
400	Davis Investment Partners, LLC	$656K	3,580	−794	TRIM
401	CHESAPEAKE CAPITAL CORP /IL/	$650K	3,544	0	NO CHANGE
402	EVOLVE PRIVATE WEALTH, LLC	$648K	3,536	+353	ADD
403	Ironwood Financial, llc	$648K	3,535	0	NO CHANGE
404	Premier Path Wealth Partners, LLC	$646K	3,523	−2,207	TRIM
405	Hills Bank & Trust Co	$640K	3,490	−1,129	TRIM
406	Lifeworks Advisors, LLC	$635K	3,465	−468	TRIM
407	WINTON GROUP Ltd	$604K	3,297	−6,848	TRIM
408	SAX WEALTH ADVISORS, LLC	$586K	3,330	0	NO CHANGE
409	Massachusetts Wealth Management	$583K	3,180	+181	ADD
410	Waverly Advisors, LLC	$578K	3,151	+358	ADD
411	RDA Financial Network	$573K	3,125	−75	TRIM
412	F/m Investments LLC	$571K	3,117	+652	ADD
413	EVERGREEN CAPITAL MANAGEMENT LLC	$565K	3,081	+493	ADD
414	NLB Skladi, upravljanje premozenja, d.o.o.	$560K	3,055	−18,952	TRIM
415	Sivia Capital Partners, LLC	$551K	3,003	+688	ADD
416	ROBERTS GLORE & CO INC /IL/	$550K	3,001	−80	TRIM
417	TRUST CO OF TOLEDO NA /OH/	$544K	2,965	+458	ADD
418	iSAM Funds (UK) Ltd	$535K	2,916	+2,916	NEW
419	Legacy Capital Group California, Inc.	$532K	2,901	+2,901	NEW
420	Bank Pictet & Cie (Europe) AG	$528K	2,880	−89	TRIM
421	HORIZON KINETICS ASSET MANAGEMENT LLC	$524K	2,857	−131	TRIM
422	Wedmont Private Capital	$523K	2,908	+115	ADD
423	Aprio Wealth Management, LLC	$522K	2,850	+900	ADD
424	CIM INVESTMENT MANAGEMENT INC	$519K	2,830	−14	TRIM
425	KCM INVESTMENT ADVISORS LLC	$514K	2,803	+4	ADD
426	Caerus Investment Advisors, LLC	$514K	2,801	+134	ADD
427	Uncommon Cents Investing LLC	$509K	2,779	0	NO CHANGE
428	Empirical Financial Services, LLC d.b.a. Empirical Wealth Management	$504K	2,751	+533	ADD
429	Waterfront Wealth Inc.	$504K	2,747	−22	TRIM
430	Compound Planning, Inc.	$503K	2,742	−536	TRIM
431	OPPENHEIMER & CO INC	$499K	2,720	+2,720	NEW
432	CSS LLC/IL	$499K	2,720	−3,360	TRIM
433	SteelPeak Wealth, LLC	$496K	2,704	+2,704	NEW
434	ASSETMARK, INC	$493K	2,690	+298	ADD
435	Frec Markets, Inc.	$482K	2,628	+474	ADD
436	TEMA ETFS LLC	$482K	2,627	+7	ADD
437	Westside Investment Management, Inc.	$478K	2,637	+125	ADD
438	EAGLE GLOBAL ADVISORS LLC	$477K	2,600	0	NO CHANGE
439	Pitcairn Wealth Advisors LLC	$475K	2,697	+132	ADD
440	Aljian Capital Management, LLC	$466K	2,540	+125	ADD
441	Clearstead Advisors, LLC	$463K	2,523	+274	ADD
442	PRUDENTIAL PLC	$460K	2,508	0	NO CHANGE
443	DKRT Investments Corp.	$458K	2,500	0	NO CHANGE
444	Atria Investments, Inc	$447K	2,437	−766	TRIM
445	Blackhawk Capital Partners, LLC	$445K	2,426	+339	ADD
446	TFB Advisors LLC	$444K	2,423	−25	TRIM
447	CHOREO, LLC	$436K	2,380	+3	ADD
448	PERSONAL CFO SOLUTIONS, LLC	$433K	2,362	−41	TRIM
449	PDT Partners, LLC	$430K	2,348	0	NO CHANGE
450	CITIZENS FINANCIAL GROUP INC/RI	$430K	2,346	+549	ADD
451	Philip James Wealth Mangement, LLC	$426K	2,323	−5	TRIM
452	WADDELL & ASSOCIATES, LLC	$415K	2,264	+522	ADD
453	INCEPTIONR LLC	$412K	2,248	−2,628	TRIM
454	Concurrent Investment Advisors, LLC	$407K	2,222	−2,154	TRIM
455	Baker Avenue Asset Management, LP	$405K	2,207	+610	ADD
456	OPPENHEIMER ASSET MANAGEMENT INC.	$404K	2,204	−808	TRIM
457	Smartleaf Asset Management LLC	$399K	2,125	+273	ADD
458	NAVELLIER & ASSOCIATES INC	$397K	2,164	0	NO CHANGE
459	SIMPLEX TRADING, LLC	$397K	2,164	−28,714	TRIM
460	Tower Research Capital LLC (TRC)	$396K	2,159	−1,672	TRIM
461	Simplicity Wealth,LLC	$394K	2,149	+197	ADD
462	Parcion Private Wealth LLC	$392K	2,140	+44	ADD
463	CIDEL ASSET MANAGEMENT INC	$390K	2,129	+190	ADD
464	DoubleLine ETF Adviser LP	$390K	2,125	+2,125	NEW
465	Evercore Wealth Management, LLC	$387K	2,112	−30	TRIM
466	B. Riley Wealth Advisors, Inc.	$387K	2,064	+68	ADD
467	SECTORAL ASSET MANAGEMENT INC	$386K	1,850	−305	TRIM
468	Capital Investment Advisors, LLC	$383K	2,087	+86	ADD
469	BSW Wealth Partners	$380K	2,074	+165	ADD
470	AGP FRANKLIN, LLC	$380K	2,073	+2,073	NEW
471	Procyon Advisors, LLC	$378K	2,063	+666	ADD
472	Richwood Investment Advisors, LLC	$373K	2,032	−90	TRIM
473	Northwest & Ethical Investments L.P.	$367K	2,000	0	NO CHANGE
474	QTR Family Wealth, LLC	$356K	1,990	+138	ADD
475	SAGESPRING WEALTH PARTNERS, LLC	$351K	1,913	+659	ADD
476	Stratos Wealth Partners, LTD.	$351K	1,912	−13	TRIM
477	Persistent Asset Partners Ltd	$349K	1,903	−971	TRIM
478	Camelot Portfolios, LLC	$348K	1,900	0	NO CHANGE
479	Forum Financial Management, LP	$346K	1,890	−3,997	TRIM
480	Resonant Capital Advisors, LLC	$344K	1,874	+190	ADD
481	FORBES J M & CO LLP	$343K	1,869	0	NO CHANGE
482	FLPUTNAM INVESTMENT MANAGEMENT CO	$341K	1,861	−37	TRIM
483	Parkside Financial Bank & Trust	$340K	1,855	+84	ADD
484	Investors Research Corp	$339K	1,850	0	NO CHANGE
485	WESTPAC BANKING CORP	$338K	1,843	−335	TRIM
486	Applied Finance Capital Management, LLC	$338K	1,842	+38	ADD
487	OSLO PENSJONSFORSIKRING AS	$337K	1,840	—	NO PRIOR
488	Everhart Financial Group, Inc.	$337K	1,838	+181	ADD
489	Colonial River Investments, LLC	$335K	1,830	−443	TRIM
490	EXCHANGE TRADED CONCEPTS, LLC	$334K	1,823	−261	TRIM
491	Brand Asset Management Group, Inc.	$333K	1,814	+1,814	NEW
492	VestGen Advisors, LLC	$331K	1,662	−5,222	TRIM
493	Trail Ridge Investment Advisors, LLC	$331K	1,807	0	NO CHANGE
494	HANCOCK WHITNEY CORP	$328K	1,735	−5	TRIM
495	D'Orazio & Associates, Inc.	$326K	1,777	+1,777	NEW
496	Integrated Advisors Network LLC	$324K	1,767	−337	TRIM
497	UMB Bank, n.a.	$323K	1,762	+163	ADD
498	Abacus Planning Group, Inc.	$323K	1,760	−72	TRIM
499	Pure Financial Advisors, LLC	$316K	1,724	+551	ADD
500	Kera Capital Partners, Inc.	$316K	1,723	+58	ADD

Truncated by Public Filings. Top 500 of 788 holders shown; the rest are on EDGAR. Method ↗

Newest filing in this build: 2026-07-31. Per-row filing dates are on each receipt.

Congress ↔ notable managers · BIIB

Congress · last 90 days

Buyers: 0 — —
Sellers: 2 Kevin Hern R–OK-1, Maria Elvira Salazar R–FL-27 $2K–$30K

filed 2026-07-31 → 2026-10-29 · statutory ranges

Use of congressional disclosure reports for commercial purposes, credit decisions or solicitation is restricted by 5 U.S.C. §13107(c).

Notable managers · quarter ended 2026-03-31

Adding: 1 Gotham Asset Management $54.7M held
Trimming: 1 Glenview Capital $10.5M held

by shares · $ = value heldNEW + ADD vs TRIM + EXIT, by share count. $ = reported value now, not the change. · BIOGEN INC

Merged timeline of congressional filings and notable-manager moves on BIIB
Date	Who	Change	Size
2026-10-07	Maria Elvira Salazar Congress	SELL	$1K–$15K
2026-09-01	Kevin Hern Congress	SELL	$1K–$15K
2026-05-15	Gotham Asset Management 13F	ADD	+21,628 sh
2026-05-15	Glenview Capital 13F	TRIM	−233,586 sh

4 newest, by filing date · 13F rows are quarter-end snapshots, not trades

A 13F is a quarterly, long-only snapshot filed up to 45 days late — not current holdings. what a 13F covers ↗

13F reports cover LONG positions in Section 13(f) securities (US exchange-traded equities plus reportable options, warrants, certain convertibles) held by managers with at least $100M in such securities — so managers below that threshold are absent entirely. No short positions, no cash, no non-13(f) assets — not a full portfolio, and not a census of institutional ownership.

Positions are quarter-end snapshots filed up to 45 days late — not current holdings: a position may have changed or closed since the quarter ended.

Values are the manager's stated market value at quarter-end in era-dependent units (whole dollars for form versions effective 2023-01-03 onward, thousands before), normalized here to whole dollars; each record notes its original unit.

Affiliated managers may report the same position, so one position can appear under more than one filer.

Positions under confidential treatment may be omitted until a later amendment discloses them.

These are disclosures, not investment advice.