# EDGAR Filing Document

**Accession Number:** 0000875045
**File Stem:** 0001193125-26-187383
**Filing Date:** 2026-4
**Character Count:** 4895
**Document Hash:** e722560d352b886bfceb2e94e238192d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-187383.hdr.sgml**: 20260428

**ACCESSION NUMBER**: 0001193125-26-187383

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260428

**DATE AS OF CHANGE**: 20260428

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** BIOGEN INC.
- **CENTRAL INDEX KEY:** 0000875045
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 330112644
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-19311
- **FILM NUMBER:** 26908686

**BUSINESS ADDRESS:**
- **STREET 1:** 225 BINNEY STREET
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02142
- **BUSINESS PHONE:** 7814642000

**MAIL ADDRESS:**
- **STREET 1:** 225 BINNEY STREET
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02142

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BIOGEN IDEC INC.
- **DATE OF NAME CHANGE:** 20070427

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BIOGEN IDEC INC
- **DATE OF NAME CHANGE:** 20031112

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** IDEC PHARMACEUTICALS CORP / DE
- **DATE OF NAME CHANGE:** 19970530

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**WASHINGTON, D.C. 20549** 

**SCHEDULE 14A** 

**PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE** 

**SECURITIES EXCHANGE ACT OF 1934** 

Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))** 

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material under §240.14a-12

**BIOGEN INC.** 

**(Name of Registrant as Specified In Its Charter)** 

**(Name of Person(s) Filing Proxy Statement, if other than the Registrant)** 

Payment of Filing Fee (Check all boxes that apply):

☒ No fee required.

☐ Fee paid previously with preliminary materials

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

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![LOGO](g788083g00a41.jpg)

Your Vote Counts! BIOGEN INC. 2026 Annual Meeting Vote by June 8, 2026 11:59 PM ET BIOGEN INC. 225 BINNEY STREET CAMBRIDGE, MA 02142 V92826-P51643 You invested in BIOGEN INC. and it's time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on June 9, 2026. Get informed before you vote View the 2026 Notice and Proxy Statement and 2025 Annual Report with Form 10-K online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 26, 2026. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting\* June 9, 2026 9:00 a.m. Eastern Time Virtually at: www.virtualshareholdermeeting.com/BIIB2026 \*Please check the meeting materials for any special requirements for meeting attendance.

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![LOGO](g788083g00a42.jpg)

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Board Voting Items Recommends 1. Election of Directors. To elect the 10 nominees identified in the accompanying Proxy Statement to our Board of Directors to serve for a one-year term extending until our 2027 annual meeting of stockholders and their successors are duly elected and qualified. Nominees: 1a. Maria C. Freire 1b. William A. Hawkins 1c. Susan K. Langer 1d. Jesus B. Mantas 1e. Lloyd Minor 1f. Menelas Pangalos 1g. Monish Patolawala 1h. Eric K. Rowinsky 1i. Stephen A. Sherwin 1j. Christopher A. Viehbacher 2. To ratify the selection of PricewaterhouseCoopers LLP as our independent registered public accounting firm for fiscal year ending December 31, 2026. 3. Say on Pay - To hold an advisory vote on executive compensation. 4. To transact such other business as may be properly brought before the annual meeting and any adjournments or postponements. For For For For For For For For For For For For Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click "Delivery Settings". V92827-P51643