Planned sale of 748 BIIB (NASDAQ: BIIB) shares under Rule 144

Rhea-AI Filing Summary

A holder of 748 shares of common stock of a NASDAQ-listed company has filed a notice of proposed sale under Rule 144. The shares have an aggregate market value of 134116.40 and are planned to be sold on 02/02/2026 through Fidelity Brokerage Services LLC on NASDAQ.

The securities were recently acquired on 02/01/2026 via restricted stock vesting from the issuer as compensation. The filer represents they are not aware of any undisclosed material adverse information about the issuer’s current or prospective operations.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	748	134116.40	146702272	02/02/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	02/01/2026	Restricted Stock Vesting	Issuer			748	02/01/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 filing for BIIB disclose?

The filing discloses a planned sale of 748 common shares under Rule 144. The shares, valued at 134116.40 in total, are to be sold on NASDAQ through Fidelity Brokerage Services LLC, following recent acquisition via restricted stock vesting as compensation.

How many BIIB shares are planned for sale under this Form 144?

The notice covers a proposed sale of 748 shares of common stock. These shares have an aggregate market value of 134116.40 and are to be sold on NASDAQ through Fidelity Brokerage Services LLC on or about 02/02/2026, subject to market conditions and Rule 144 requirements.

How were the BIIB shares in this Form 144 acquired?

The 748 common shares were acquired on 02/01/2026 through restricted stock vesting from the issuer. The filing specifies the nature of payment as compensation, indicating the shares were not bought for cash but granted as part of a compensation arrangement.

When is the planned sale date for the BIIB shares in this Form 144?

The approximate date of sale listed is 02/02/2026 on NASDAQ. The sale is to be executed through Fidelity Brokerage Services LLC, consistent with Rule 144 requirements governing resale of restricted or control securities into the public market.

What assurances does the Form 144 filer give about BIIB information?

The person for whose account the securities will be sold represents they do not know any material adverse, non-public information about the issuer. This statement is required and is made as of signing the notice under the Rule 144 framework.