BIIB Insider Trading Activity

Transactions disclosed by company insiders to the SEC on Form 4, most recent first.

InsiderRoleDateSharesValue
Minor Lloyd Director 2026-08-04 593 $119,169
Minor Lloyd Director 2026-08-03 593 $120,581

How Institutional Funds Moved on BIIB

Position changes disclosed in SEC Form 13F filings. These report a quarterly snapshot, not exact trade dates.

FundChangeQuarter
NORGES BANK NORGES BANK opened a new position worth $557,441,930. 2026-06-30
PERCEPTIVE ADVISORS LLC PERCEPTIVE ADVISORS LLC opened a new position worth $59,669,938. 2026-06-30
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ MASSACHUSETTS FINANCIAL SERVICES CO /MA/ increased this position by 3914% ($3,216,953 -> $129,114,863). 2026-06-30
Boston Partners Boston Partners increased this position by 1708% ($13,107,730 -> $237,039,714). 2026-06-30
DIMENSIONAL FUND ADVISORS LP DIMENSIONAL FUND ADVISORS LP increased this position by 50% ($122,006,709 -> $183,196,029). 2026-06-30
GEODE CAPITAL MANAGEMENT, LLC GEODE CAPITAL MANAGEMENT, LLC increased this position by 21% ($706,982,292 -> $853,425,885). 2026-06-30
RENAISSANCE TECHNOLOGIES LLC RENAISSANCE TECHNOLOGIES LLC reduced this position by 55% ($37,288,589 -> $16,797,369). 2026-06-30
BNP PARIBAS ASSET MANAGEMENT Holding S.A. BNP PARIBAS ASSET MANAGEMENT Holding S.A. increased this position by 4190% ($1,102,547 -> $47,304,392). 2026-06-30

Which Funds Hold BIIB

Largest reported positions as of 2026-06-30.

FundValueShares
PRIMECAP MANAGEMENT CO/CA/ $3,274,304,389 15,154,606
FMR LLC $2,480,996,199 11,482,904
VANGUARD CAPITAL MANAGEMENT LLC $2,085,220,339 9,651,117
VANGUARD PORTFOLIO MANAGEMENT LLC $1,427,062,472 6,604,936
GEODE CAPITAL MANAGEMENT, LLC $853,425,885 3,965,587
WELLINGTON MANAGEMENT GROUP LLP $651,741,965 3,016,486
NORGES BANK $557,441,930 2,580,033
Boston Partners $237,039,714 1,097,693
Alyeska Investment Group, L.P. $201,448,726 932,374
Pictet Asset Management Holding SA $184,144,886 851,819

Data compiled from public SEC filings. This is informational reporting, not investment advice.

Sofinnova Investments, Inc.: 13F Portfolio Moves, Tracked Quarterly

Chart-style profile tracking Sofinnova Investments, Inc.'s quarterly 13F portfolio moves, including new positions, increased stakes, and exited holdings.

This page follows Sofinnova Investments, Inc.’s institutional portfolio as disclosed in its quarterly Form 13F filings with the SEC. A Form 13F is a required filing for institutional investment managers overseeing more than $100 million in U.S. equities, and it offers a snapshot of long positions held at the end of each quarter — not … Read more