BIIB · Nasdaq · CIK 0000875045

BIOGEN INC.

BIOGEN INC.’s most recent SEC filing in our snapshot is a Form 4 filed on Oct 5, 2026. In fiscal 2025 (year ended Dec 31, 2025) it reported revenue of $9.9B and net income of $1.3B, according to its XBRL data on EDGAR. Its EDGAR record lists 37 Form 4 insider filings from the 12 months before our last refresh.

SEC EDGAR snapshot updated Oct 27, 2026, 11:27 PM EDT. See all filings on sec.gov.

Revenue, FY2025
$9.9B
Net income, FY2025
$1.3B
Form 4 filings on record, past 12 months
37

Company overview

Legal name (as filed)
BIOGEN INC.
Ticker
BIIB
SEC Central Index Key (CIK)
0000875045
Business address
CAMBRIDGE, MA
State or country of incorporation
DE
Fiscal year ends
December 31
SEC filer category
Large accelerated filer
Position in SEC ticker list
#400 of the 3,000 companies we track

Five-year financial highlights

Full-year figures from BIOGEN INC.’s annual reports, as tagged in XBRL and published by the SEC. Amounts are in U.S. dollars; the fiscal year is named for the calendar year in which it ends.

Revenue
$11.0BFY2021$10.2BFY2022$9.8BFY2023$9.7BFY2024$9.9BFY2025
Net income
$1.6BFY2021$3.0BFY2022$1.2BFY2023$1.6BFY2024$1.3BFY2025
BIIB annual results
ItemFY2021
ended Dec 31, 2021		FY2022
ended Dec 31, 2022		FY2023
ended Dec 31, 2023		FY2024
ended Dec 31, 2024		FY2025
ended Dec 31, 2025
Revenue$11.0B$10.2B$9.8B$9.7B$9.9B
Net income$1.6B$3.0B$1.2B$1.6B$1.3B
Diluted EPS$10.40$20.87$7.97$11.18$8.79
Total assets$23.9B$24.6B$26.8B$28.0B$29.4B
Cash and equivalents$2.3B$3.4B$1.0B$2.4B$3.0B

XBRL tags used: revenue = Revenues; netIncome = NetIncomeLoss; assets = Assets; eps = EarningsPerShareDiluted; cash = CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents. EPS is shown as originally reported for each year and may not be adjusted for later stock splits. A dash means the company did not report that item in a form we could match.

How to read these numbers

Revenue is the money a company brings in from selling its products and services; net income is what is left after all expenses, interest and taxes. Diluted EPS spreads net income across every share that could exist if options and convertible securities were exercised. Total assets and cash are balance-sheet figures measured on the last day of the fiscal year. For the full story — segment results, one-time charges, guidance — read Management’s Discussion and Analysis in the Form 10-K.

Latest key reports

The most recent filing of each major report type, even if it falls outside the 40 newest filings below.

BIIB latest annual, quarterly, current and proxy reports
FiledFormWhat it isOriginal
Feb 6, 202610-KAnnual report· period Dec 31, 2025Document · Index
Jul 29, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Jul 29, 20268-KResults of operations· period Jul 29, 2026Document · Index
Apr 28, 2026DEF 14ADefinitive proxy statement· period Jun 9, 2026Document · Index

Recent SEC filings

The 40 newest documents filed by or about BIOGEN INC., by form type:

4 ×138-K ×6SCHEDULE 13G/A ×3SC TO-T/A ×33 ×2144 ×210-Q ×28-K/A ×1SCHEDULE 13D/A ×1SCHEDULE 13G ×1ARS ×1DEFA14A ×1DEF 14A ×1SC TO-T ×1SC TO-C ×1SCHEDULE 13D ×1
BIIB recent filings
FiledFormWhat it isOriginal
Oct 5, 20264Statement of changes in beneficial ownership (insider trade)· period Oct 1, 2026Document · Index
Sep 3, 20264Statement of changes in beneficial ownership (insider trade)· period Sep 1, 2026Document · Index
Aug 12, 20263Initial statement of beneficial ownership· period Aug 3, 2026Document · Index
Aug 6, 2026SCHEDULE 13G/APassive beneficial ownership report (over 5%)Document · Index
Aug 5, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 3, 2026Document · Index
Aug 4, 2026144Notice of proposed sale of securitiesDocument · Index
Aug 3, 2026144Notice of proposed sale of securitiesDocument · Index
Jul 29, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Jul 29, 20268-KResults of operations· period Jul 29, 2026Document · Index
Jul 1, 20268-KResults of operations· period Jul 1, 2026Document · Index
Jun 11, 20264Statement of changes in beneficial ownership (insider trade)· period Jun 9, 2026Document · Index
Jun 11, 20264Statement of changes in beneficial ownership (insider trade)· period Jun 9, 2026Document · Index
Jun 11, 20264Statement of changes in beneficial ownership (insider trade)· period Jun 9, 2026Document · Index
Jun 11, 20264Statement of changes in beneficial ownership (insider trade)· period Jun 9, 2026Document · Index
Jun 11, 20264Statement of changes in beneficial ownership (insider trade)· period Jun 9, 2026Document · Index
Jun 11, 20264Statement of changes in beneficial ownership (insider trade)· period Jun 9, 2026Document · Index
Jun 11, 20264Statement of changes in beneficial ownership (insider trade)· period Jun 9, 2026Document · Index
Jun 11, 20264Statement of changes in beneficial ownership (insider trade)· period Jun 9, 2026Document · Index
Jun 11, 20264Statement of changes in beneficial ownership (insider trade)· period Jun 9, 2026Document · Index
Jun 10, 20268-KShareholder vote results· period Jun 9, 2026Document · Index
Jun 10, 20268-K/ACURRENT REPORT· period May 14, 2026Document · Index
Jun 5, 2026SCHEDULE 13G/APassive beneficial ownership report (over 5%)Document · Index
May 14, 20268-KMaterial agreement; Acquisition or disposition completed; New financial obligation; Regulation FD disclosure· period May 14, 2026Document · Index
May 14, 2026SC TO-T/ASC TO-T/ADocument · Index
May 14, 2026SCHEDULE 13D/AActive beneficial ownership report (over 5%)Document · Index
May 12, 2026SC TO-T/AAMENDMENT NO. 2Document · Index
May 6, 2026SC TO-T/AAMENDMENT NO. 1Document · Index
May 6, 2026SCHEDULE 13G/APassive beneficial ownership report (over 5%)Document · Index
May 5, 20264Statement of changes in beneficial ownership (insider trade)· period May 1, 2026Document · Index
Apr 29, 2026SCHEDULE 13GPassive beneficial ownership report (over 5%)Document · Index
Apr 29, 202610-QQuarterly report· period Mar 31, 2026Document · Index
Apr 29, 20268-KResults of operations· period Apr 29, 2026Document · Index
Apr 28, 2026ARSARS· period Dec 31, 2025Document · Index
Apr 28, 2026DEFA14AAdditional proxy soliciting materialsDocument · Index
Apr 28, 2026DEF 14ADefinitive proxy statement· period Jun 9, 2026Document · Index
Apr 14, 2026SC TO-TSC TO-TDocument · Index
Apr 7, 2026SC TO-CSCHEDULE TODocument · Index
Apr 6, 20263Initial statement of beneficial ownership· period Mar 31, 2026Document · Index
Apr 6, 2026SCHEDULE 13DActive beneficial ownership report (over 5%)Document · Index
Apr 6, 20268-KResults of operations· period Apr 6, 2026Document · Index

Insider filing activity

37 Form 4 filings appear in BIOGEN INC.’s EDGAR record between Oct 28, 2025 and our last refresh. Most are reports by the company’s own directors, officers and 10% owners, but EDGAR also lists a Form 4 under a company when the company itself is the insider — for example, when it owns more than 10% of another public company. Foreign private issuers’ own insiders generally do not file Form 4. A high count is not by itself a signal: many Form 4s report routine stock awards, tax withholding or sales under pre-arranged Rule 10b5-1 plans. Open each filing to see the transaction code, share count and price. What a Form 4 shows.

Other companies in Biological Products, (No Diagnostic Substances)

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Source

  • U.S. Securities and Exchange Commission, EDGAR submissions for CIK 0000875045 and XBRL company facts. BIOGEN INC. on EDGAR.
  • Snapshot updated Oct 27, 2026, 11:27 PM EDT. The SEC does not endorse OpenFilings. Company names and tickers are used only to identify the filer; no logos are shown.

Not investment advice. This page summarizes public SEC filings for information only. Figures may contain errors or omissions; confirm everything in the original filing before relying on it.