WhaleCreep

Which hedge funds own BIIB? BIOGEN INC, Q2 2026 13F holders

HealthcareDrug Manufacturers - General

57 tracked hedge funds disclosed a position in BIIB (BIOGEN INC) in their Q2 2026 13F filings, worth $1.3bn in total. The largest holder by portfolio weight is Palo Alto Investors LP at 4.2% of its book. 14 opened a new position this quarter: Perceptive Advisors LLC, Polymer Capital Management (HK) LTD, 9823 Capital, L.P., Caption Management, LLC. 21 exited: Defilade Capital Management, L.P., Sofinnova Investments, Inc., Logos Global Management LP.

57
Holders
Tracked managers whose filing for the quarter reports a long equity position in the security.
14
New this quarter
Holders whose previous filing (at most two quarters earlier) did not report the security.
21
Exited this quarter
Tracked managers whose previous filing reported the security and whose filing for the quarter does not.
$133m
Inflow, new holders
Combined value of the positions the new holders reported for the quarter.
$190m
Outflow, exits
Combined value the exiting managers reported for the security in their previous filing.
$1.3bn
Combined value
Sum of the holders' reported positions in the security.
4.6%
Share of managers holding
Holders as a share of tracked managers filing for that quarter. Comparable across the 2024 coverage expansion, where the raw holder count is not.

Holders, Q2 2026

57 rows
Palo Alto Investors LP Hedge fund4.2%$30.3m140,279−0.3%held
Sphera Funds Management Ltd. Hedge fund3.0%$20.9m96,626+4.4%added
Sivik Global Healthcare LLC Hedge fund2.1%$2.8m15,0000.0%held
Krensavage Asset Management, LLC Hedge fund1.6%$4.3m20,0000.0%held
Silverarc Capital Management, LLC Hedge fund1.2%$10.4m48,101−5.6%reduced
Perceptive Advisors LLC Hedge fund0.9%$59.7m276,173–new
Birchview Capital, LP Hedge fund0.9%$1.9m9,000+80%added
Integral Health Asset Management, LLC Hedge fund0.9%$21.6m100,000+67%added
Polymer Capital Management (HK) LTD Hedge fund0.8%$8.4m38,665–new
Artia Global Partners LP Hedge fund0.8%$4.0m18,4370.0%held
Cinctive Capital Management LP Hedge fund0.6%$15.7m72,793+276%added
Alyeska Investment Group, L.P. Hedge fund0.5%$201m932,374+16%added
Arrowpoint Investment Partners (Singapore) Pte. Ltd. Hedge fund0.4%$1.5m6,838+45%added
Pavaki Capital Management LLC Hedge fund0.4%$756k3,5000.0%held
Candriam S.C.A. Hedge fund0.4%$83.0m384,326+0.7%added
9823 Capital, L.P. Hedge fund0.4%$539k2,494–new
Kintegral Advisory, LLC Hedge fund0.3%$3.9m17,9460.0%held
Orbimed Advisors LLC Hedge fund0.3%$13.3m61,6000.0%held
Twin Tree Management, LP Hedge fund0.2%$1.2m5,507+626%added
ADAR1 Capital Management, LLC Hedge fund0.2%$3.9m17,900+63%added
Jupiter Asset Management Ltd Hedge fund0.2%$34.6m160,057+2141%added
Caption Management, LLC Hedge fund0.2%$4.5m21,000–new
AQR Capital Management LLC Hedge fund0.1%$417m1.94m+0.7%added
Catalyst Funds Management Pty Ltd Hedge fund0.1%$2.5m11,400−4.8%reduced
Bayforest Capital Ltd Hedge fund0.1%$144k667–new
Pin Oak Investment Advisors Inc Hedge fund0.1%$177k821+0.1%held
Freestone Grove Partners LP Hedge fund0.1%$18.1m83,853–new
Sarissa Capital Management LP Hedge fund0.1%$205k950–new
CenterBook Partners LP Hedge fund0.1%$2.3m10,418–new
Encore Global Management, LP Hedge fund0.1%$108k5000.0%held
Balyasny Asset Management L.P. Hedge fund0.1%$57.3m265,090−59%reduced
Hudson Bay Capital Management LP Hedge fund0.09%$19.4m90,000−55%reduced
EntryPoint Capital, LLC Hedge fund0.09%$371k1,716–new
Farallon Capital Management, L.L.C. Hedge fund0.09%$15.3m71,000–new
Woodline Partners LP Hedge fund0.08%$24.3m112,463+3.1%added
Citadel Advisors LLC Hedge fund0.05%$90.4m418,356+203%added
IFM Investors Pty Ltd Hedge fund0.05%$7.8m36,263−5.9%reduced
Lighthouse Investment Partners, LLC Hedge fund0.05%$1.6m7,500−77%reduced
Verition Fund Management LLC Hedge fund0.05%$6.7m30,914–new
Adage Capital Partners GP, L.L.C. Hedge fund0.04%$28.0m129,599−61%reduced
Fulcrum Asset Management LLP Hedge fund0.03%$335k1,546–new
Point72 Asset Management, L.P. Hedge fund0.03%$19.0m88,149−89%reduced
Cohen Klingenstein LLC Hedge fund0.02%$864k4,0000.0%held
Renaissance Technologies LLC Hedge fund0.02%$16.8m77,744−62%reduced
Trust Asset Management LLC Hedge fund0.02%$349k1,6170.0%held
Parallax Volatility Advisers, L.P. Hedge fund0.02%$495k2,291+36%added
CVA Family Office, LLC Family office0.01%$128k592+1.9%added
SummitTX Capital, L.P. Hedge fund0.01%$404k1,872−91%reduced
D. E. Shaw & Co., Inc. Hedge fund0.01%$16.1m74,438–new
Horizon Kinetics (Murray Stahl) Long-only investor0.01%$589k2,726−4.6%reduced