AI Holders Summary · Q2 2026

1,102 institutions reported BIIB in Q2 2026. FMR LLC leads at 18.0% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

Hide index funds / market makers / custodians(5 on this page)

#HolderValueShares% port.Quarter

FMR LLC

CIK 0000315066

$3.9B18.2M0.17%Q2 2026 02

BlackRock, Inc.

CIK 0002012383

$3.5B16.0M0.05%Q2 2026 03

PRIMECAP MANAGEMENT CO/CA/

CIK 0000763212

$3.3B15.2M1.94%Q2 2026 04

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$2.1B9.7M0.04%Q2 2026 05

STATE STREET CORP

CIK 0000093751

$1.6B7.3M0.05%Q2 2026 06

Vanguard Portfolio Management

CIK 0002100121· Index

$1.4B6.6M0.06%Q2 2026 07

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$958M4.4M0.05%Q2 2026 08

WELLINGTON MANAGEMENT GROUP LLP

CIK 0000902219

$674M3.1M0.12%Q2 2026 09

NORGES BANK

CIK 0001374170· Sovereign

$557M2.6M0.06%Q2 2026 10

MORGAN STANLEY

CIK 0000895421

$521M2.4M0.03%Q2 2026 11

AQR CAPITAL MANAGEMENT LLC

CIK 0001167557

$417M1.9M0.15%Q2 2026 12

JPMORGAN CHASE & CO

CIK 0000019617

$395M1.8M0.02%Q2 2026 13

Invesco Ltd.

CIK 0000914208

$390M1.8M0.03%Q2 2026 14

SUSQUEHANNA INTERNATIONAL GROUP, LLP

CIK 0001446194· Market maker

$356M1.6M0.03%Q2 2026 15

UBS Group AG

CIK 0001610520

$331M1.5M0.04%Q2 2026 16

Amundi

CIK 0001330387

$328M1.5M0.08%Q2 2026 17

Legal & General Group Plc

CIK 0000764068

$323M1.5M0.07%Q2 2026 18

NORTHERN TRUST CORP

CIK 0000073124· Index

$309M1.4M0.04%Q2 2026 19

GOLDMAN SACHS GROUP INC

CIK 0000886982

$274M1.3M0.02%Q2 2026 20

Boston Partners

CIK 0001386060

$273M1.3M0.24%Q2 2026

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