Public ownership evidence

Biogen Inc. Common Stock (BIIB) Ownership Disclosures

Read BIIB insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-05T21:01:49.000Z

Recent Form 4 activity

2026-10-052026-10-01Godbout SeanA985Not reported
2026-09-042026-09-01Parini MichaelA7,405Not reported
2026-08-062026-08-04Minor LloydS593Not reported
2026-08-062026-08-03Minor LloydS593Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

Cornerstone Financial Management LLC2026-06-302026-08-2982$17,717None
Cornerstone Financial Management LLC2026-03-312026-08-2948$8,800None
Cornerstone Financial Management LLC2025-12-312026-08-2939$6,864None
B. Riley Wealth Advisors, Inc.2025-03-312026-08-292,228$304,880None
Advisors Asset Management, Inc.2021-12-312026-08-285,284$1,267,737None
Advisors Asset Management, Inc.2022-12-312026-08-285,472$1,515,306None
Advisors Asset Management, Inc.2020-06-302026-08-281,588$424,869None
Advisors Asset Management, Inc.2022-06-302026-08-285,371$1,095,000None
Advisors Asset Management, Inc.2021-09-302026-08-285,048$1,429,000None
Corient Private Wealth LP2026-06-302026-08-2838,881$8,400,795None
Corient Private Wealth LP2026-06-302026-08-283,516$759,667None
Formuepleje A/S2018-06-302026-08-28113,070$32,817,437None
Formuepleje A/S2018-03-312026-08-2882,870$22,691,463None
Formuepleje A/S2017-12-312026-08-2887,070$27,737,890None
Formuepleje A/S2017-09-302026-08-2883,800$26,239,456None
Formuepleje A/S2017-06-302026-08-2893,400$25,345,024None
Formuepleje A/S2017-03-312026-08-2870,200$19,194,084None
Formuepleje A/S2016-12-312026-08-2862,400$17,695,392None
Formuepleje A/S2016-09-302026-08-2862,800$19,658,284None
Formuepleje A/S2016-06-302026-08-2867,500$16,322,850None
Principia Wealth Advisory, LLC2026-06-302026-08-27189$40,835None
Principia Wealth Advisory, LLC2026-03-312026-08-27186$34,099None
Advisors Asset Management, Inc.2024-03-312026-08-277,441$1,604,503None
Advisors Asset Management, Inc.2025-03-312026-08-276,384$873,587None
Advisors Asset Management, Inc.2022-09-302026-08-275,706$1,524,000None
Advisors Asset Management, Inc.2020-12-312026-08-273,126$765,000None
Advisors Asset Management, Inc.2022-03-312026-08-274,373$920,954None
Advisors Asset Management, Inc.2023-06-302026-08-275,886$1,676,627None
Advisors Asset Management, Inc.2023-09-302026-08-275,870$1,508,649None
Advisors Asset Management, Inc.2023-03-312026-08-275,314$1,477,451None
Advisors Asset Management, Inc.2021-03-312026-08-274,486$1,254,959None
Advisors Asset Management, Inc.2021-06-302026-08-274,993$1,729,000None
Advisors Asset Management, Inc.2020-09-302026-08-271,664$472,044None
Advisors Asset Management, Inc.2025-09-302026-08-276,080$851,686None
Advisors Asset Management, Inc.2023-12-312026-08-276,990$1,808,802None
Dakota Wealth Management2025-09-302026-08-278,677$1,215,475None
Dakota Wealth Management2025-12-312026-08-2745,897$8,077,414None
Dakota Wealth Management2026-03-312026-08-2745,587$8,357,465None
Advus Financial Partners, LLC2026-06-302026-08-262,566$554,410None
Advus Financial Partners, LLC2026-03-312026-08-262,622$480,691None
Advus Financial Partners, LLC2025-12-312026-08-262,130$374,859None
Advus Financial Partners, LLC2025-09-302026-08-262,070$289,966None
Groupe la Francaise2026-06-302026-08-26519$112,135None
Advisors Asset Management, Inc.2019-12-312026-08-262,442$724,615None
Advisors Asset Management, Inc.2025-06-302026-08-255,713$717,496None
CYBER HORNET ETFs LLC2026-06-302026-08-25403$87,072None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25220,009$47,535,145None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2547,535,145$220,009,000None
Bernard Wealth Management Corp.2026-06-302026-08-2211$2,377None
Advisors Asset Management, Inc.2024-09-302026-08-226,696$1,297,953None

90-day public filing window, up to 50 source positions.

Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗B. Riley Wealth Advisors, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Corient Private Wealth LP ↗

Recent Congressional disclosures

Maria Elvira Salazar2026-10-082026-09-24sale$1,001 - $15,000
Ro Khanna2026-10-082026-09-04purchase$1,001 - $15,000
Ro Khanna2026-10-082026-09-11sale$1,001 - $15,000

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.