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BIIBBiogen

Health care · Biotechnology · Nasdaq

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Filings with the SEC since Sep 22, 2014

1,000 filings, 3 in the last 30 days

SEC filing index

Latest annual reportOpen ↗

Feb 6, 2026

10-K, period to Dec 31, 2025

Latest quarterly reportOpen ↗

Oct 28, 2026

10-Q, period to Sep 30, 2026

Latest current reportOpen ↗

Oct 28, 2026

8-K: Quarterly results

Filed in the last 30 days

of 1,000 in all

Timeline

Every filing on one line

1 yr 2 yr 3 yr

Annual report (10-K)Quarterly report (10-Q)Current report (8-K)Auditor changeCEO, CFO, COO or CAO changeRestatementLate filing noticeInsider purchaseCluster buy (3+ insiders)SEC comment letterShare offering (S-3, 424B)

20252026

All 31 events

Oct 28, 20268-K Quarterly results 8-K item 2.02
Oct 28, 202610-Q Quarterly report (10-Q) period ended Sep 30, 2026
Jul 29, 20268-K Quarterly results 8-K item 2.02
Jul 29, 202610-Q Quarterly report (10-Q) period ended Jun 30, 2026
Jul 1, 20268-K Quarterly results 8-K item 2.02
Jun 10, 20268-K Current report (amended) 8-K
Jun 10, 20268-K Shareholder vote results 8-K item 5.07
May 14, 20268-K Material agreement signed, Acquisition or sale of assets completed, New debt or obligation, Regulation FD disclosure 8-K items 1.01, 2.01, 2.03, 7.01
Apr 29, 20268-K Quarterly results 8-K item 2.02
Apr 29, 202610-Q Quarterly report (10-Q) period ended Mar 31, 2026
Apr 6, 20268-K Quarterly results 8-K item 2.02
Mar 31, 20268-K Material agreement signed, Other events 8-K items 1.01, 8.01
Mar 11, 20268-K Director or officer change 8-K item 5.02
Feb 11, 20268-K Director or officer change, Other events 8-K items 5.02, 8.01
Feb 6, 20268-K Quarterly results 8-K item 2.02
Feb 6, 202610-K Annual report (10-K) period ended Dec 31, 2025
Jan 14, 20268-K Quarterly results 8-K item 2.02
Oct 30, 20258-K Quarterly results 8-K item 2.02
Oct 30, 202510-Q Quarterly report (10-Q) period ended Sep 30, 2025
Oct 14, 20258-K Quarterly results 8-K item 2.02
Jul 31, 20258-K Quarterly results 8-K item 2.02
Jul 31, 202510-Q Quarterly report (10-Q) period ended Jun 30, 2025
Jul 7, 20258-K Quarterly results 8-K item 2.02
Jun 23, 20258-K Shareholder vote results 8-K item 5.07
May 12, 20258-K Other events 8-K item 8.01
May 1, 2025Offering Shelf registration: shares and other securities, amount not fixed S-3ASR · Warrants Depositary Shares Biogen Inc. may offer and sell from time to time, in one or more series or issuances and on terms determined at the time of the offering, any combination of the securities described in this prospectus.
May 1, 20258-K Quarterly results 8-K item 2.02
May 1, 202510-Q Quarterly report (10-Q) period ended Mar 31, 2025
Feb 12, 20258-K Quarterly results 8-K item 2.02
Feb 12, 202510-K Annual report (10-K) period ended Dec 31, 2024
Jan 15, 20258-K Director or officer change 8-K item 5.02

From the SEC filing index. Insider purchases go back 180 days (the Form 4s downloaded).

Every filing

Newest first, by kind

Each form links to sec.gov

All 1000 Annual & quarterly 49 Current reports (8-K) 123 Insiders 671 Proxy & votes 38 Big owners (13D/13G) 66 Shares & debt offered 17 SEC letters 17 Other 19

Filed	Form	What it is	Period
Apr 28, 2026	DEFA14A	Extra proxy material		all files
Apr 28, 2026	DEF 14A	Proxy statement	Jun 9, 2026	all files
Jun 2, 2025	DEFA14A	Extra proxy material		all files
Apr 28, 2025	DEFA14A	Extra proxy material		all files
Apr 28, 2025	DEF 14A	Proxy statement	Jun 17, 2025	all files
Apr 26, 2024	DEFA14A	Extra proxy material		all files
Apr 26, 2024	DEF 14A	Proxy statement	Jun 20, 2024	all files
Apr 12, 2024	PRE 14A		Jun 20, 2024	all files
Jul 31, 2023	DEFA14A	Extra proxy material		all files
Jul 28, 2023	DEFA14A	Extra proxy material		all files
Jun 13, 2023	DEFA14A	Extra proxy material		all files
Jun 12, 2023	DEFA14A	Extra proxy material		all files
Apr 28, 2023	DEFA14A	Extra proxy material		all files
Apr 28, 2023	DEF 14A	Proxy statement		all files
Jun 7, 2022	DEFA14A	Extra proxy material		all files
Apr 29, 2022	DEFA14A	Extra proxy material		all files
Apr 29, 2022	DEF 14A	Proxy statement	Jun 15, 2022	all files
May 28, 2021	PX14A6G	Shareholder's proxy letter		all files
Apr 23, 2021	DEFA14A	Extra proxy material		all files
Apr 23, 2021	DEF 14A	Proxy statement	Jun 2, 2021	all files
Apr 9, 2021	PRE 14A		Jun 2, 2021	all files
Apr 9, 2021	DEFA14A	Extra proxy material		all files
Apr 20, 2020	DEFA14A	Extra proxy material		all files
Apr 20, 2020	DEF 14A	Proxy statement	Jun 3, 2020	all files
May 24, 2019	DEFA14A	Extra proxy material		all files
Apr 30, 2019	DEFA14A	Extra proxy material		all files
Apr 30, 2019	DEF 14A	Proxy statement	Jun 19, 2019	all files
Apr 29, 2019	DEFA14A	Extra proxy material		all files
May 3, 2018	PX14A6G	Shareholder's proxy letter		all files
Apr 27, 2018	DEFA14A	Extra proxy material		all files
Apr 27, 2018	DEF 14A	Proxy statement	Jun 12, 2018	all files
Mar 27, 2018	PX14A6G	Shareholder's proxy letter		all files
Apr 26, 2017	DEFA14A	Extra proxy material		all files
Apr 26, 2017	DEF 14A	Proxy statement	Jun 7, 2017	all files
Apr 15, 2016	DEFA14A	Extra proxy material		all files
Apr 15, 2016	DEF 14A	Proxy statement	Jun 8, 2016	all files
Apr 30, 2015	DEFA14A	Extra proxy material		all files
Apr 30, 2015	DEF 14A	Proxy statement	Jun 10, 2015	all files

Show the other 13 filings on this page

Press releases with quarterly results are attached to the 8-Ks marked "Quarterly results"; read them on Earnings releases.

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