Biogen: which funds bought and sold

Institutions that bought and sold Biogen shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 531 institutions that filed 13F reports for both quarters added to or opened positions in Biogen, and 372 cut or closed them. Together they added a net 4.8M shares, +3.5% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 3.0M shares (+6.5%); index fund managers were net buyers of 419K shares (+0.9%). 107 opened a new position and 83 sold out entirely.

Bought, Q2 2026 531 institutions, 107 of them new holders Sold, Q2 2026 372 institutions, 83 of them sold out

Net change, all compared +4.8M shares (+3.5%)

Net change, active managers +3.0M shares (+6.5%), 36 bought, 38 sold

Buyers versus sellers

institutions compared, 1,096

531 bought 193 372 sold

Active managers and hedge funds 36 bought · 38 sold · +3.0M

Index fund managers 7 bought · 5 sold · +419K

Other institutions 488 bought · 329 sold · +1.3M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
FMR LLC Active manager	+5.4M +42.2%	18.2M	$3.9B
Amundi	+726K +91.8%	1.5M	$328M
UBS Group AG	+507K +96.8%	1.0M	$223M
Pacer Advisors, Inc.	+463K +70.0%	1.1M	$243M
Primecap Management Co Active manager	+397K +2.7%	15.2M	$3.3B
Citadel Advisors LLC Hedge fund	+280K +203.0%	418K	$90.4M
Perceptive Advisors LLC Hedge fund	+276K New position	276K	$59.7M
Morgan Stanley	+240K +11.1%	2.4M	$521M
Citigroup Inc	+234K +46.8%	735K	$159M
Voya Investment Management LLC	+192K +352.3%	247K	$53.3M
Goldman Sachs Group Inc	+179K +17.1%	1.2M	$266M
Royal Bank Of Canada	+177K +33.3%	709K	$153M
State Street Corp Index funds	+176K +2.5%	7.3M	$1.6B
Wellington Management Group LLP Active manager	+156K +5.3%	3.1M	$674M
Nissay Asset Management Corp /Japan	+156K +522.6%	185K	$40M
Jupiter Asset Management Ltd Active manager	+153K +2141.4%	160K	$34.6M
Legal & General Group PLC	+143K +10.6%	1.5M	$323M
Lord, Abbett & Co. LLC	+130K New position	130K	$28.1M
Alyeska Investment Group, L.P. Hedge fund	+127K +15.8%	932K	$201M
Vanguard Capital Management LLC Index funds	+114K +1.2%	9.7M	$2.1B

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
FMR LLC Active manager	+5.4M +42.2%	18.2M	$3.9B
Primecap Management Co Active manager	+397K +2.7%	15.2M	$3.3B
Citadel Advisors LLC Hedge fund	+280K +203.0%	418K	$90.4M
Perceptive Advisors LLC Hedge fund	+276K New position	276K	$59.7M
Wellington Management Group LLP Active manager	+156K +5.3%	3.1M	$674M
Jupiter Asset Management Ltd Active manager	+153K +2141.4%	160K	$34.6M
Alyeska Investment Group, L.P. Hedge fund	+127K +15.8%	932K	$201M
LSV Asset Management Active manager	+110K +33.1%	444K	$95.9M
Price T Rowe Associates Inc Active manager	+102K +15.1%	774K	$167M
Antipodes Partners Ltd Hedge fund	+87K New position	87K	$18.8M

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
T. Rowe Price Investment Management, Inc. Active manager	−1.0M −90.2%	114K	$24.6M
Van Eck Associates Corp	−982K −90.9%	98K	$21.2M
Point72 Asset Management, L.P. Hedge fund	−721K −89.1%	88K	$19M
Boston Partners Active manager	−437K −25.7%	1.3M	$273M
Balyasny Asset Management L.P. Hedge fund	−385K −59.2%	265K	$57.3M
Barclays PLC	−304K −55.2%	247K	$53.4M
Sofinnova Investments, Inc.	−230K Sold out	0	—
Marshall Wace, LLP Hedge fund	−217K −94.5%	13K	$2.7M
Qube Research & Technologies Ltd Hedge fund	−213K Sold out	0	—
Adage Capital Partners Gp, L.L.C. Hedge fund	−204K −61.1%	130K	$28M
Logos Global Management LP Hedge fund	−200K Sold out	0	—
Jpmorgan Chase & Co	−193K −9.6%	1.8M	$395M
SG Americas Securities, LLC	−173K −88.3%	23K	$4.9M
Deutsche Bank Ag\	−170K −16.0%	894K	$193M
Exoduspoint Capital Management, LP Hedge fund	−149K −98.1%	2,871	$620,308
Renaissance Technologies LLC Hedge fund	−126K −61.8%	78K	$16.8M
Man Group PLC Hedge fund	−123K −38.4%	196K	$42.4M
UBS Am, A Distinct Business Unit Of UBS Asset Management Americas LLC	−122K −8.9%	1.3M	$271M
Acadian Asset Management LLC Active manager	−119K −47.7%	130K	$28.1M
Thompson Siegel & Walmsley LLC	−118K −47.4%	131K	$28.2M

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
T. Rowe Price Investment Management, Inc. Active manager	−1.0M −90.2%	114K	$24.6M
Point72 Asset Management, L.P. Hedge fund	−721K −89.1%	88K	$19M
Boston Partners Active manager	−437K −25.7%	1.3M	$273M
Balyasny Asset Management L.P. Hedge fund	−385K −59.2%	265K	$57.3M
Marshall Wace, LLP Hedge fund	−217K −94.5%	13K	$2.7M
Qube Research & Technologies Ltd Hedge fund	−213K Sold out	0	—
Adage Capital Partners Gp, L.L.C. Hedge fund	−204K −61.1%	130K	$28M
Logos Global Management LP Hedge fund	−200K Sold out	0	—
Exoduspoint Capital Management, LP Hedge fund	−149K −98.1%	2,871	$620,308
Renaissance Technologies LLC Hedge fund	−126K −61.8%	78K	$16.8M

New positions

largest by value

Institution	Shares	Value June 30, 2026
Perceptive Advisors LLCHedge fund	276K	$59.7M
Lord, Abbett & Co. LLC	130K	$28.1M
Antipodes Partners LtdHedge fund	87K	$18.8M
Freestone Grove Partners LPHedge fund	84K	$18.1M
D. E. Shaw & Co., Inc.Hedge fund	74K	$16.1M
Atle Fund Management AB	63K	$13.6M
Picton Mahoney Asset Management	47K	$10.1M
Polymer Capital Management (HK) Ltd	39K	$8.4M
Zurich Insurance Group Ltd	35K	$7.6M
Verition Fund Management LLCHedge fund	31K	$6.7M

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Sofinnova Investments, Inc.	230K	$42.1M
Qube Research & Technologies LtdHedge fund	213K	$39M
Logos Global Management LPHedge fund	200K	$36.7M
Defilade Capital Management, L.P.	96K	$17.7M
Millennium Management LLCHedge fund	94K	$17.2M
Glenview Capital Management, LLCHedge fund	57K	$10.5M
Schonfeld Strategic Advisors LLCHedge fund	49K	$9M
Tang Capital Management LLCHedge fund	35K	$6.4M
Impax Asset Management Group PLC	29K	$5.3M
Atom Investors LP	25K	$4.5M

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 1,034
Ten largest holders: 60.1%
Index fund managers: 33.6%
Active managers and hedge funds: 34.7%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	36	38	8	11	+3.0M	+6.5%
Index fund managers	7	5	0	0	+419K	+0.9%
Other institutions	488	329	99	72	+1.3M	+3.3%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Biogen.

Only managers that filed a holdings report for both quarters are compared (1,096 here). 36 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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