AI Holders Summary · Q3 2026

1,116 institutions reported BIIB in Q3 2026. FMR LLC leads at 17.1% of the visible book.

Top holders

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

Hide index funds / market makers / custodians(7 on this page)

#HolderValueShares% port.Quarter

FMR LLC

CIK 0000315066

$3.8B16.8M0.16%Q3 2026 02

BlackRock, Inc.

CIK 0002012383

$3.6B16.1M0.05%Q3 2026 03

PRIMECAP MANAGEMENT CO/CA/

CIK 0000763212

$3.4B15.2M2.13%Q3 2026 04

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$2.2B9.7M0.05%Q3 2026 05

STATE STREET CORP

CIK 0000093751

$1.7B7.6M0.05%Q3 2026 06

Vanguard Portfolio Management

CIK 0002100121· Index

$1.5B6.6M0.07%Q3 2026 07

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$1.0B4.5M0.05%Q3 2026 08

WELLINGTON MANAGEMENT GROUP LLP

CIK 0000902219

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

MORGAN STANLEY

CIK 0000895421

$566M2.5M0.03%Q3 2026 10

JPMORGAN CHASE & CO

CIK 0000019617

$463M2.0M0.03%Q3 2026 11

Invesco Ltd.

CIK 0000914208

$446M2.0M0.04%Q3 2026 12

AQR CAPITAL MANAGEMENT LLC

CIK 0001167557

$417M1.9M0.15%Q2 2026 13

SUSQUEHANNA INTERNATIONAL GROUP, LLP

CIK 0001446194· Market maker

$356M1.6M0.03%Q2 2026 14

Legal & General Group Plc

CIK 0000764068

$323M1.5M0.07%Q2 2026 15

NORTHERN TRUST CORP

CIK 0000073124· Index

$309M1.4M0.04%Q2 2026 16

Amundi

CIK 0001330387

$297M1.3M0.06%Q3 2026 17

GOLDMAN SACHS GROUP INC

CIK 0000886982

$274M1.3M0.02%Q2 2026 18

UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC

CIK 0000861177

$271M1.3M0.05%Q2 2026 19

DIMENSIONAL FUND ADVISORS LP

CIK 0000354204· Quasi-passive

$262M1.2M0.05%Q3 2026 20

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

CIK 0000884546· Index

$241M1.1M0.03%Q2 2026

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