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Disclosery

BIIB BIOGEN INC

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Stock (common), issuer CIK 875045

889 managers (910 13F filers) reported a position in BIIB shares at 2025-09-30, 131,320,309 shares in all. 117 filers opened a position and 72 filers sold out during the quarter.

Managers
889
13F filers
910
New
117
Added
324
Reduced
269
Sold out
72
Shares held by filers
131,320,309

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q3 2025

Filers in the available 13F reports with a share position at 2025-09-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
AMERIFLEX GROUP, INC.36$5.04K<0.01%+1813F-HRTimeline
RAFFA WEALTH MANAGEMENT, LLC35$4.9K<0.01%+1413F-HRTimeline
Sunbelt Securities, Inc.35$4.9K<0.01%-44213F-HRTimeline
Rosenberg Matthew Hamilton35$4.9K<0.01%013F-HRTimeline
Kilter Group LLC35$4.9K<0.01%+1513F-HRTimeline
CALDWELL SUTTER CAPITAL, INC.34$4.76K<0.01%013F-HRTimeline
Truvestments Capital LLC33$4.66K<0.01%-3513F-HRTimeline
Pinnacle Bancorp, Inc.32$4.48K<0.01%013F-HRTimeline
GHP Investment Advisors, Inc.31$4.34K<0.01%-5113F-HRTimeline
Howard Hughes Medical Institute31$4.34K<0.01%013F-HRTimeline
BARRETT & COMPANY, INC.30$4.2K<0.01%013F-HRTimeline
Marquette Asset Management, LLC30$4.2K<0.01%new13F-HRTimeline
ST GERMAIN D J CO INCin group ST GERMAIN D J CO INC30$4.2K<0.01%013F-HRTimelineGroup
Tower View Wealth Management LLC29$4.06K<0.01%013F-HRTimeline
Geneos Wealth Management Inc.29$4.06K<0.01%-5013F-HRTimeline
American Wealth Advisors, LLC29$4.06K<0.01%13F-HRTimeline
Roble, Belko & Company, Inc25$4K<0.01%013F-HRTimeline
Bangor Savings Bank28$3.92K<0.01%013F-HRTimeline
WPG Advisers, LLC28$3.92K<0.01%+2513F-HRTimeline
Hughes Financial Services, LLC25$3.91K<0.01%-413F-HRTimeline
SouthState Bank Corpin group SouthState Bank Corp27$3.78K<0.01%-6813F-HRTimelineGroup
Westfuller Advisors, LLC26$3.64K<0.01%new13F-HRTimeline
CONSULTIVA WEALTH MANAGEMENT, CORP.25$3.5K0.01%013F-HRTimeline
Colonial Trust Advisorsgroup of 2 filers holding23$3.22K0Timeline
Abound Wealth Management22$3.09K<0.01%013F-HRTimeline
FIRST UNITED BANK & TRUST20$2.8K<0.01%013F-HRTimeline
Fortitude Family Office, LLC20$2.8K<0.01%013F-HRTimeline
Transamerica Financial Advisors, LLCin group Transamerica Financial Adviso…19$2.66K<0.01%new13F-HRTimelineGroup
Plante Moran Financial Advisors, LLC17$2.38K<0.01%013F-HRTimeline
Financial Management Professionals, Inc.16$2.24K<0.01%013F-HRTimeline
Winch Advisory Services, LLC16$2.24K<0.01%013F-HRTimeline
Darwin Wealth Management, LLC16$2.24K<0.01%013F-HRTimeline
Accredited Wealth Management, LLC200$2.1K<0.01%+18513F-HRTimeline
J.Safra Asset Management Corp15$2.1K<0.01%new13F-HRTimeline
Fortis Group Advisors, LLC15$2.1K<0.01%013F-HRTimeline
NVWM, LLC14$1.96K<0.01%013F-HRTimeline
HOLLENCREST CAPITAL MANAGEMENT13$1.82K<0.01%013F-HRTimeline
Crewe Advisors LLC11$1.54K<0.01%new13F-HRTimeline
Park Place Capital Corp11$1.54K<0.01%013F-HRTimeline
Bernard Wealth Management Corp.11$1.54K<0.01%013F-HRTimeline
Indiana Trust & Investment Management Co10$1.4K<0.01%-1013F-HRTimeline
1 NORTH WEALTH SERVICES LLC10$1.4K<0.01%013F-HRTimeline
Strategic Investment Solutions, Inc. /IL10$1.4K<0.01%013F-HRTimeline
Bare Financial Services, Inc10$1.4K<0.01%new13F-HRTimeline
AdvisorNet Financial, Inc9$1.26K<0.01%013F-HRTimeline
Avalon Trust Co9$1.26K<0.01%new13F-HRTimeline
Activest Wealth Management9$1.26K<0.01%-3413F-HRTimeline
Wealth Preservation Advisors, LLC9$1.26K<0.01%013F-HRTimeline
IMG Wealth Management, Inc.9$1.26K<0.01%013F-HRTimeline
Wealth Watch Advisors, INC9$1.26K<0.01%new13F-HRTimeline
Rialto Wealth Management, LLC9$1.26K<0.01%+313F-HRTimeline
Clark Wealth Partners7$1.23K<0.01%013F-HRTimeline
American Capital Advisory, LLC8$1.13K<0.01%013F-HRTimeline
FNY Investment Advisers, LLC13$1K<0.01%new13F-HRTimeline
Cloud Capital Management, LLC11$1K<0.01%new13F-HRTimeline
HAZLETT, BURT & WATSON, INC.10$1K<0.01%013F-HRTimeline
Cape Investment Advisory, Inc.7$981<0.01%-213F-HRTimeline
ALBION FINANCIAL GROUP /UT6$841<0.01%013F-HRTimeline
Quaker Wealth Management, LLC6$841<0.01%013F-HRTimeline
Fairman Group, LLC6$840<0.01%013F-HRTimeline
LRI Investments, LLC6$840<0.01%013F-HRTimeline
ATWOOD & PALMER INC5$701<0.01%013F-HRTimeline
EVERMAY WEALTH MANAGEMENT LLC5$701<0.01%013F-HRTimeline
JFS WEALTH ADVISORS, LLC5$701<0.01%013F-HRTimeline
WOLFF WIESE MAGANA LLC5$701<0.01%013F-HRTimeline
FINANCIAL CONSULATE, INC4$561<0.01%new13F-HRTimeline
TFC Financial Management, Inc.4$561<0.01%+313F-HRTimeline
Breakwater Investment Management4$561<0.01%new13F-HRTimeline
WestEnd Advisors, LLC4$560<0.01%-213F-HRTimeline
DecisionPoint Financial, LLC3$463<0.01%013F-HRTimeline
Turning Point Benefit Group, Inc.3$462<0.01%new13F-HRTimeline
WINNACLE WEALTH LLC3$423<0.01%new13F-HRTimeline
Dunhill Financial, LLC3$422<0.01%-113F-HRTimeline
COUNTRY TRUST BANK2$280<0.01%new13F-HRTimeline
Ancora Advisors LLCin group Ancora Advisors LLC2$280<0.01%013F-HRTimelineGroup
Hurley Capital, LLC2$280<0.01%new13F-HRTimeline
Bay Harbor Wealth Management, LLC2$280<0.01%+113F-HRTimeline
Davis Capital Management2$280<0.01%13F-HRTimeline
DiNuzzo Private Wealth, Inc.2$265<0.01%013F-HRTimeline
Palisade Asset Management, LLC1$141<0.01%new13F-HRTimeline
CREATIVE FINANCIAL DESIGNS INC /ADV1$140<0.01%013F-HRTimeline
ROSS\JOHNSON & Associates LLC1$140<0.01%013F-HRTimeline
HFM Investment Advisors, LLC1$140<0.01%-113F-HRTimeline
Quest 10 Wealth Builders, Inc.1$109<0.01%013F-HRTimeline
Cornerstone Planning Group LLC2$104<0.01%-5013F-HRTimeline
Koesten, Hirschmann & Crabtree, INC.0$41<0.01%new13F-HRTimelineAmount filed as zero, left out of ratios.
West Oak Capital, LLC25$35<0.01%-2013F-HRTimeline
Compagnie Lombard Odier SCmA0$00%-2013F-HRTimelineValue filed as zero, left out of ratios. Amount filed as zero, left out of ratios.
Y.D. More Investments Ltdin group Y.D. More Investments Ltd39$16new13F-HRTimelineGroupValue about 1/1,000 of the price other filers imply, kept as filed and left out of ratios.