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BIIB — BIOGEN INC.

Reported value held$18.19B
Funds holding (latest)54
SectorHealth Care

Index member: S&P 500

Funds holding (Q2 2026)44
Institutional value$14.90B · 69.72M sh
New / Add / Cut / Exit2 / 22 / 19 / 1
Top-5 / Top-10 concentration64.3% / 78.1%
Institutional holdings change Accumulating +19.2% (+11.23M sh)
Institutional value change Up +40.6%

As of Q2 2026, 44 SEC-registered investment managers reported holding BIIB (BIOGEN INC.) in their latest 13F filings, with a combined reported value of $14.90B across 69.72M shares. That is +19.2% by share count (+11.23M shares) versus the previous quarter, while reported value moved +40.6%. Ownership is concentrated: the five largest holders account for 64.3% of reported value and the top ten for 78.1%.

Compared with the prior quarter, 2 opened new positions, 22 added to existing stakes, 19 trimmed, 1 exited entirely. 13F holdings are quarter-end snapshots, so these moves reflect positioning as of Q2 2026, not real-time trading.

BIIB is a constituent of the S&P 500 and is classified in the Health Care sector.

All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.

FundQuarterSharesValuePortfolio WeightChange
Fidelity Management & Research (FMR) history Q2 2026 18.22M $3.94B 0.19% Add
BlackRock Inc history Q2 2026 15.99M $3.45B 0.05% Hold
Vanguard Group history Q4 2025 17.45M $3.07B 0.04% Add
Geode Capital Management history Q2 2026 4.45M $957.94M 0.05% Add
Wellington Management Group history Q2 2026 3.12M $673.56M 0.12% Add
Norges Bank Investment Management history Q2 2026 2.58M $557.44M 0.06% Reduce
Morgan Stanley history Q2 2026 2.41M $520.98M 0.03% Add
AQR Capital Management history Q2 2026 1.94M $416.93M 0.14% Add
JPMorgan Chase & Co history Q2 2026 1.82M $394.95M 0.04% New
Invesco Ltd history Q2 2026 1.80M $389.76M 0.03% Add
UBS Group AG history Q2 2026 1.53M $331.30M 0.04% Add
Amundi US history Q2 2026 1.52M $327.73M 0.08% Add
Legal & General Investment Management America history Q2 2026 1.49M $322.64M 0.07% Add
Northern Trust Corp history Q2 2026 1.43M $308.86M 0.04% Reduce
Goldman Sachs Group history Q2 2026 1.27M $274.48M 0.03% Add
Charles Schwab Investment Management history Q2 2026 1.12M $241.48M 0.03% Reduce
Bank of America Corp history Q2 2026 1.12M $241.17M 0.02% Reduce
Deutsche Bank AG history Q2 2026 894.03K $193.17M 0.06% Reduce
Citadel Advisors history Q2 2026 867.56K $187.44M 0.02% Add
Southeastern Asset Management history Q1 2022 842.96K $177.53M 3.30% Reduce

View all 54 fund holders →

New Positions (Q2 2026)

Fully Exited (vs previous quarter)

Fund Position History — shares by quarter (top 20 funds)

FundQ3 2021Q4 2021Q1 2022Q2 2022Q3 2022Q4 2022Q1 2023Q2 2023Q3 2023Q4 2023Q1 2024Q2 2024Q3 2024Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026
Fidelity Management & Research (FMR) 1.18M 187.30K 387.97K 1.03M 1.48M 1.21M 1.75M 2.64M 1.36M 1.00M 620.85K 610.42K 381.21K 757.57K 1.31M 1.67M 1.29M 9.43M 12.81M 18.22M
BlackRock Inc — — — — — — — — — — — — 15.35M 15.47M 15.21M 13.56M 14.76M 14.81M 15.97M 15.99M
Geode Capital Management 2.78M 2.75M 2.81M 3.25M 3.30M 3.34M 3.10M 3.18M 3.24M 3.31M 3.41M 3.57M 3.61M 3.70M 3.85M 3.92M 4.07M 4.20M 4.34M 4.45M
Wellington Management Group 5.58M 6.18M 6.25M 6.29M 5.14M 5.41M 5.45M 5.35M 5.37M 5.32M 5.12M 5.17M 5.13M 4.93M 4.67M 4.80M 4.25M 3.55M 2.96M 3.12M
Norges Bank Investment Management — — — — — 1.31M — — — 1.46M — 2.08M — 2.33M — 2.26M — 2.64M — 2.58M
Morgan Stanley 753.72K 780.48K 955.83K 1.38M 1.24M 1.42M 1.31M 1.43M 1.49M 1.58M 1.70M 1.61M 1.89M 1.78M 1.99M 1.96M 2.25M 2.33M 2.17M 2.41M
AQR Capital Management 350.86K 328.22K 396.31K 513.21K 254.46K 197.82K 422.49K 336.39K 306.68K 37.14K 6.36K 23.56K 49.88K 539.69K 1.37M 1.36M 1.78M 1.53M 1.92M 1.94M
JPMorgan Chase & Co 9.50K 63.00K 12.50K 30.50K 43.90K 73.10K 13.60K 7.50K 44.00K 36.00K 9.00K 9.00K 9.00K 30.00K 20.00K 1.00M 150.00K 34.00K — 1.82M
Invesco Ltd 990.58K 1.13M 954.41K 956.34K 970.78K 920.48K 1.02M 992.01K 1.18M 1.81M 1.67M 1.29M 1.63M 2.13M 2.27M 2.32M 2.42M 1.66M 1.75M 1.80M
UBS Group AG 669.73K 693.61K 508.22K 441.61K 326.69K 505.48K 503.48K 617.83K 876.50K 805.25K 800.23K 718.41K 783.65K 1.47M 816.65K 557.98K 753.76K 766.99K 526.65K 1.53M
Amundi US 855.00K 803.59K 347.26K 407.83K 648.90K 818.63K 578.29K 1.19M 1.09M 1.20M 985.80K 684.82K 897.51K 1.22M 1.32M 579.80K 618.31K 572.43K 790.83K 1.52M
Legal & General Investment Management America 1.41M 1.36M 1.44M 1.46M 1.43M 1.38M 1.36M 1.37M 1.34M 1.57M 1.55M 1.55M 1.51M 1.23M 1.29M 1.45M 1.59M 1.46M 1.35M 1.49M
Northern Trust Corp 1.76M 1.69M 1.69M 1.71M 1.69M 1.67M 1.67M 1.60M 1.64M 1.49M 1.39M 1.43M 1.35M 1.55M 1.50M 1.54M 1.50M 1.45M 1.45M 1.43M
Goldman Sachs Group 889.93K 1.01M 1.34M 1.68M 1.49M 1.09M 675.25K 849.66K 790.85K 1.10M 994.37K 1.42M 989.04K 770.32K 604.70K 670.85K 1.06M 1.16M 1.18M 1.27M
Charles Schwab Investment Management 731.20K 741.74K 764.76K 789.88K 820.57K 836.29K 844.38K 850.20K 848.69K 849.00K 858.80K 900.71K 913.03K 971.26K 1.02M 1.08M 1.12M 1.14M 1.15M 1.12M
Bank of America Corp 1.36M 1.58M 814.18K 942.26K 744.10K 621.04K 834.61K 415.98K 502.59K 973.57K 471.92K 536.05K 705.85K 512.92K 755.36K 1.09M 1.27M 1.13M 1.16M 1.12M
Deutsche Bank AG 1.38M 1.57M 1.44M 1.67M 1.60M 1.85M 1.64M 1.21M 936.48K 1.19M 1.06M 653.67K 714.28K 1.17M 941.05K 1.12M 1.23M 953.73K 1.06M 894.03K
Citadel Advisors 1.67M 1.27M 1.18M 1.35M 2.97M 2.11M 1.30M 747.40K 621.64K 431.36K 404.80K 274.80K 631.27K 564.76K 1.75M 1.35M 771.93K 609.42K 530.69K 867.56K
Citigroup Inc 331.67K 443.73K 205.78K 211.32K 352.71K 219.33K 327.97K 329.90K 368.76K 310.45K 226.72K 261.35K 246.15K 455.44K 426.12K 316.94K 296.00K 667.54K 521.71K 810.82K
BNY Mellon 1.61M 1.47M 1.44M 1.54M 1.51M 1.51M 1.47M 1.47M 1.43M 1.39M 1.38M 1.25M 1.00M 974.79K 953.81K 904.05K 884.70K 811.11K 788.52K 773.62K

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