BIOGEN INC. hedge fund holdings
BIIBNASDAQ$219.88-2.94 (-1.32%)as of Oct 2, 2026
Every quarter, large institutional investment managers with over $100M in U.S.-listed assets under management disclose their U.S. equity holdings through 13F filings. Read together, those filings show which businesses professional capital is moving into and out of.
Price vs funds buying and selling
BIIB · close · 13FReported Aug 14, 2026Price vs funds buying and selling data
Showing the 1Y range: Oct 2, 2025 to Oct 2, 2026. Price (+41.6%). 0 fund reports plotted in this window as 0 markers; nearby trades of the same kind are grouped.
| Date | Category | Person | Role | Action | Amount | Change in holding |
|---|
Funds buying · new + increased
Funds selling · reduced + closed
Net buyers vs sellers
Buying = new + increased; selling = reduced + closed. Counts exclude position changes under 5% of the fund's holding last quarter.Price and fund activity data
| Quarter | Funds buying | Funds selling | Bought | Sold | Filers | Reported |
|---|---|---|---|---|---|---|
| Q2 2025 | 317 | 260 | $1.5B | $1.34B | 817 | Aug 14, 2025 |
| Q3 2025 | 312 | 221 | $1.74B | $1.21B | 862 | Nov 14, 2025 |
| Q4 2025 | 341 | 260 | $2.75B | $2.28B | 949 | Feb 14, 2026 |
| Q1 2026 | 352 | 272 | $1.73B | $2.28B | 962 | May 15, 2026 |
| Q2 2026 | 357 | 235 | $2.81B | $1.7B | 975 | Aug 14, 2026 |
Quarterly action breakdown
Q2 2026
975 filersNew position
99$221M+1.02M sh
Increased
258$2.59B+12M sh
Reduced
162-$1.46B-6.74M sh
Out / sold
73-$242M-1.12M sh
Last 4 quarters · free
Reported Aug 14, 2026
| Fund | Action | Change in dollar | Value | % of portfolio | Reported |
|---|---|---|---|---|---|
| T. Rowe Price Investment Management, Inc. | Reduce 90.19% | -$226M | $24.6M | 0.02% | Aug 14, 2026 |
| Van Eck Associates Corp | Reduce 90.91% | -$212M | $21.2M | 0.01% | Aug 14, 2026 |
| Pacer Advisors, Inc. | Added 70.04% | +$99.9M | $243M | 0.62% | Aug 13, 2026 |
| Primecap Management Co | Added 2.69% | +$85.8M | $3.27B | 1.94% | Aug 14, 2026 |
| Perceptive Advisors LLC | New Buy | +$59.7M | $59.7M | 0.90% | Aug 14, 2026 |
| Adage Capital Partners GP, L.L.C. | Reduce 61.13% | -$44M | $28M | 0.04% | Aug 14, 2026 |
| Sofinnova Investments, Inc. | Sell 100% | -$42.1M | $0 | 0.00% | Aug 14, 2026 |
| Logos Global Management LP | Sell 100% | -$36.7M | $0 | 0.00% | Aug 14, 2026 |
| Wellington Management Group LLP | Added 5.26% | +$33.7M | $674M | 0.12% | Aug 14, 2026 |
| Nissay Asset Management Corp /Japan | Added 522.61% | +$33.6M | $40M | 0.17% | Aug 14, 2026 |
| Jupiter Asset Management Ltd | Added 2141.38% | +$33M | $34.6M | 0.17% | Aug 10, 2026 |
| Lord, Abbett & Co. LLC | New Buy | +$28.1M | $28.1M | 0.08% | Aug 14, 2026 |
| Thompson Siegel & Walmsley LLC | Reduce 47.45% | -$25.5M | $28.2M | 0.51% | Aug 11, 2026 |
| LSV Asset Management | Added 33.05% | +$23.8M | $95.9M | 0.17% | Aug 6, 2026 |
| Nippon Life Global Investors Americas, Inc. | Added 308.76% | +$22.4M | $29.6M | 1.18% | Aug 6, 2026 |
| Canada Pension Plan Investment Board | Reduce 88.17% | -$21.9M | $2.94M | 0.00% | Aug 14, 2026 |
| Patient Capital Management, LLC | Reduce 25.29% | -$20.8M | $61.3M | 2.01% | Aug 13, 2026 |
| Freestone Grove Partners LP | New Buy | +$18.1M | $18.1M | 0.12% | Aug 14, 2026 |
| Defilade Capital Management, L.P. | Sell 100% | -$17.7M | $0 | 0.00% | Aug 14, 2026 |
| Treasurer of the State of North Carolina | Added 97.70% | +$15.9M | $32.1M | 0.08% | Aug 14, 2026 |
| Farallon Capital Management, L.L.C. | New Buy | +$15.3M | $15.3M | 0.07% | Aug 14, 2026 |
| Atle Fund Management AB | New Buy | +$13.6M | $13.6M | 3.65% | Jul 24, 2026 |
| Pictet Asset Management Holding SA | Reduce 6.73% | -$13.3M | $184M | 0.18% | Jul 30, 2026 |
| AustralianSuper Pty Ltd | Added 9.17% | +$12.2M | $145M | 0.63% | Aug 12, 2026 |
| Fred Alger Management, LLC | Added 7.52% | +$11.9M | $170M | 0.57% | Aug 14, 2026 |
| Cinctive Capital Management LP | Added 276.21% | +$11.5M | $15.7M | 0.58% | Aug 14, 2026 |
| Glenview Capital Management, LLC | Sell 100% | -$10.5M | $0 | 0.00% | Aug 14, 2026 |
| Picton Mahoney Asset Management | New Buy | +$10.1M | $10.1M | 0.07% | Aug 13, 2026 |
| KBC Group NV | Added 18.73% | +$9.5M | $60.2M | 0.13% | Aug 5, 2026 |
| Korea Investment CORP | Reduce 54.62% | -$8.73M | $7.25M | 0.01% | Aug 12, 2026 |
| Integral Health Asset Management, LLC | Added 66.67% | +$8.64M | $21.6M | 0.85% | Aug 14, 2026 |
| Credit Agricole S A | Added 169.10% | +$8.4M | $13.4M | 0.03% | Aug 14, 2026 |
| ASR Vermogensbeheer N.V. | Added 6460.00% | +$8.37M | $8.5M | 0.09% | Jul 20, 2026 |
| Polymer Capital Management (HK) LTD | New Buy | +$8.35M | $8.35M | 0.42% | Aug 13, 2026 |
| Sector Gamma As | Reduce 39.88% | -$7.76M | $11.7M | 2.54% | Aug 12, 2026 |
| Quantinno Capital Management LP | Added 30.59% | +$7.69M | $32.8M | 0.04% | Aug 13, 2026 |
| Zurich Insurance Group Ltd | New Buy | +$7.6M | $7.6M | 0.05% | Aug 14, 2026 |
| VANGUARD ASSET MANAGEMENT, Ltd | Added 13.85% | +$7.48M | $61.4M | 0.04% | Aug 13, 2026 |
| Swedbank AB | Added 10.62% | +$6.65M | $69.3M | 0.06% | Jul 15, 2026 |
| Tang Capital Management LLC | Sell 100% | -$6.42M | $0 | 0.00% | Aug 14, 2026 |
| Robeco Institutional Asset Management B.V. | Added 3.66% | +$6.03M | $171M | 0.21% | Jul 21, 2026 |
| Eurizon Capital SGR S.p.A. | Reduce 20.60% | -$5.75M | $22.2M | 0.06% | Jul 29, 2026 |
| Fisher Asset Management, LLC | Added 8.12% | +$5.49M | $73M | 0.02% | Aug 4, 2026 |
| Lighthouse Investment Partners, LLC | Reduce 77.02% | -$5.43M | $1.62M | 0.04% | Aug 14, 2026 |
| Massachusetts Financial Services Co | Added 3.37% | +$5.31M | $163M | 0.05% | Aug 3, 2026 |
| FIL Ltd | Added 7.72% | +$5.31M | $74M | 0.05% | Aug 13, 2026 |
| Mitsubishi UFJ Asset Management Co., Ltd. | Added 7.30% | +$5.27M | $77.5M | 0.04% | Aug 7, 2026 |
| Impax Asset Management Group plc | Sell 100% | -$5.27M | $0 | 0.00% | Aug 11, 2026 |
| Portolan Capital Management, LLC | Added 20.57% | +$5.27M | $30.9M | 1.16% | Aug 14, 2026 |
| APG Asset Management N.V. | Added 32.05% | +$5.09M | $21M | 0.05% | Aug 12, 2026 |
| Aberdeen Group plc | Reduce 15.16% | -$4.95M | $27.7M | 0.04% | Jul 31, 2026 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | Reduce 91.42% | -$4.51M | $423K | 0.00% | Aug 14, 2026 |
| IMC-Chicago, LLC | New Buy | +$4.46M | $4.46M | 0.00% | Aug 6, 2026 |
| Munich Reinsurance Co Stock Corp in Munich | Sell 100% | -$4.39M | $0 | 0.00% | Jul 24, 2026 |
| Schroder Investment Management Group | Reduce 34.30% | -$4.36M | $8.35M | 0.01% | Aug 13, 2026 |
| SummitTX Capital, L.P. | Reduce 91.36% | -$4.27M | $404K | 0.01% | Aug 14, 2026 |
| Mitsubishi UFJ Trust & Banking Corp | Added 29.58% | +$4.16M | $18.2M | 0.04% | Aug 6, 2026 |
| Mn Services Vermogensbeheer B.V. | Added 81.55% | +$4.1M | $9.14M | 0.07% | Jul 31, 2026 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | Added 8.68% | +$4.04M | $50.6M | 0.05% | Aug 13, 2026 |
| Gotham Asset Management, LLC | Reduce 6.21% | -$4.01M | $60.5M | 0.14% | Aug 14, 2026 |
| AEGON ASSET MANAGEMENT UK Plc | Reduce 6.82% | -$3.81M | $52.1M | 0.56% | Jul 13, 2026 |
| B. Metzler seel. Sohn & Co. AG | Reduce 58.76% | -$3.77M | $2.65M | 0.02% | Aug 11, 2026 |
| Fieldview Capital Management, LLC | Reduce 92.92% | -$3.55M | $270K | 0.08% | Aug 14, 2026 |
| QRG Capital Management, Inc. | Added 47.93% | +$3.42M | $10.5M | 0.09% | Jul 14, 2026 |
| North Growth Management Ltd. | Added 42.86% | +$3.25M | $10.8M | 1.39% | Jul 22, 2026 |
| Hussman Strategic Advisors, Inc. | Added 233.33% | +$3.18M | $4.54M | 1.05% | Aug 3, 2026 |
| Rhenman & Partners Asset Management AB | Reduce 13.06% | -$3.08M | $20.5M | 1.93% | Aug 13, 2026 |
| Erste Asset Management GmbH | Added 25.47% | +$2.93M | $14.4M | 0.11% | Jul 28, 2026 |
| Susquehanna Portfolio Strategies, LLC | Reduce 11.65% | -$2.82M | $21.3M | 0.34% | Aug 14, 2026 |
| Dymon Asia Capital (Singapore) Pte. Ltd. | Sell 100% | -$2.75M | $0 | 0.00% | Jul 23, 2026 |
| Fideuram Asset Management (Ireland) dac | New Buy | +$2.74M | $2.74M | 0.05% | Jul 23, 2026 |
| Systematic Financial Management LP | Added 72.47% | +$2.54M | $6.04M | 0.12% | Aug 14, 2026 |
| Evoke Wealth, LLC | Sell 100% | -$2.54M | $0 | 0.00% | Aug 10, 2026 |
| Turn8 Private Wealth Inc. | New Buy | +$2.53M | $2.53M | 1.69% | Aug 3, 2026 |
| Storebrand Asset Management As | Added 274.43% | +$2.5M | $3.42M | 0.01% | Aug 12, 2026 |
| LBP Am SA | Added 260.45% | +$2.46M | $3.4M | 0.03% | Jul 24, 2026 |
| Aviva PLC | Added 11.55% | +$2.42M | $23.3M | 0.03% | Aug 13, 2026 |
| Baird Financial Group, Inc. | Added 264.59% | +$2.41M | $3.32M | 0.00% | Aug 12, 2026 |
| Mizuho Securities USA LLC | Added 130.28% | +$2.33M | $4.12M | 0.04% | Jul 28, 2026 |
| Natixis | Reduce 47.28% | -$2.31M | $2.57M | 0.01% | Aug 13, 2026 |
| Handelsbanken Fonder AB | Added 12.70% | +$2.27M | $20.1M | 0.06% | Jul 10, 2026 |
| CenterBook Partners LP | New Buy | +$2.25M | $2.25M | 0.11% | Aug 11, 2026 |
| Canal Insurance CO | Reduce 50.00% | -$2.16M | $2.16M | 0.47% | Jul 21, 2026 |
| Illinois Municipal Retirement Fund | Added 11.20% | +$2.16M | $21.5M | 0.24% | Aug 12, 2026 |
| Convergence Investment Partners, LLC | Added 72.02% | +$2.11M | $5.04M | 0.48% | Jul 31, 2026 |
| Sumitomo Mitsui Trust Group, Inc. | Reduce 2.72% | -$2.09M | $74.9M | 0.04% | Jul 30, 2026 |
| Graham Capital Management, L.P. | Sell 100% | -$1.9M | $0 | 0.00% | Aug 14, 2026 |
| GFS Advisors, LLC | Sell 100% | -$1.86M | $0 | 0.00% | Aug 13, 2026 |
| Caisse de depot et placement du Quebec | Reduce 1.64% | -$1.84M | $110M | 0.16% | Aug 14, 2026 |
| First Trust Advisors LP | Added 1.20% | +$1.74M | $147M | 0.09% | Aug 11, 2026 |
| Nomura Asset Management Co Ltd | Reduce 12.73% | -$1.73M | $11.9M | 0.03% | Aug 13, 2026 |
| Farringdon Capital, Ltd. | Sell 100% | -$1.66M | $0 | 0.00% | Aug 12, 2026 |
| Cibc World Market Inc. | New Buy | +$1.6M | $1.6M | 0.00% | Aug 13, 2026 |
| Hager Investment Management Services, LLC | New Buy | +$1.59M | $1.59M | 0.73% | Jul 20, 2026 |
| MML Investors Services, LLC | Added 64.47% | +$1.58M | $4.03M | 0.01% | Aug 7, 2026 |
| Park Avenue Securities LLC | New Buy | +$1.57M | $1.57M | 0.01% | Jul 20, 2026 |
| ADAR1 Capital Management, LLC | Added 62.73% | +$1.49M | $3.87M | 0.18% | Aug 14, 2026 |
| Groupama Asset Managment | Reduce 76.96% | -$1.46M | $436K | 0.01% | Aug 14, 2026 |
| Vontobel Holding Ltd. | Added 48.15% | +$1.43M | $4.39M | 0.01% | Aug 3, 2026 |
| USS Investment Management Ltd | Added 16.93% | +$1.36M | $9.4M | 0.03% | Aug 11, 2026 |