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Biogen Inc. (BIIB) Chief Legal Officer Michael Parini submits initial Form 3

(Neutral)
(Neutral)
Form Type
3

Rhea-AI Filing Summary

BIOGEN INC. filed an initial statement of beneficial ownership for executive Michael Parini, who serves as Chief Legal Officer. The filing reports no equity transactions or specific share holdings and notes that a Power of Attorney authorizing filings is attached as an exhibit.

Positive

  • None.

Negative

  • None.
Buy transactions 0 Buy transactions count in Form 3 transaction summary
Sell transactions 0 Sell transactions count in Form 3 transaction summary
Derivative transactions 0 Derivative transaction count in Form 3 transaction summary
Form 3 regulatory
"files an initial statement of beneficial ownership on Form 3"
Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.
beneficial ownership financial
"filed an initial statement of beneficial ownership for executive Michael Parini"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
Power of Attorney legal
"Power of Attorney is attached hereto as Exhibit 24"
A power of attorney is a legal document that allows one person to make decisions and act on behalf of another person, often in financial or legal matters. It’s like giving someone a trusted helper or agent the authority to handle important tasks if you are unable to do so yourself. This matters to investors because it can impact how their assets are managed or transferred if they become unable to oversee their affairs.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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FAQ

What does Michael Parini’s Form 3 filing for BIIB disclose?

The Form 3 for Michael Parini at BIOGEN INC. (BIIB) discloses his status as Chief Legal Officer and serves as his initial beneficial ownership report, with no specific equity transactions or holdings listed.

Does the BIIB Form 3 for Michael Parini show any stock transactions?

No. The Form 3 for Michael Parini at BIIB lists no transactions, with buy, sell, acquisition, and disposition counts all at zero in the transaction summary data.

What role does Michael Parini hold at BIOGEN INC. (BIIB) in this Form 3?

In this Form 3, Michael Parini is identified as an officer of BIOGEN INC. with the title Chief Legal Officer, and not as a director or 10% beneficial owner.

Is there a Rule 10b5-1 trading plan noted in Michael Parini’s BIIB Form 3?

No Rule 10b5-1 status is indicated. The document-level trading plan indicator is null, and there are no transactions or footnotes describing any trading plans for BIIB shares.

What is the significance of the Power of Attorney mentioned in the BIIB Form 3?

The Form 3 remarks state that a Power of Attorney is attached as Exhibit 24, authorizing designated individuals to sign and submit SEC ownership reports on Michael Parini’s behalf for BIOGEN INC. (BIIB).
SEC Form 3
FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0104
Estimated average burden
hours per response:0.5
1. Name and Address of Reporting Person*
Parini Michael

(Last)(First)(Middle)
225 BINNEY STREET

(Street)
CAMBRIDGE MASSACHUSETTS 02142

(City)(State)(Zip)

UNITED STATES

(Country)
2. Date of Event Requiring Statement (Month/Day/Year)
08/03/2026
3. Issuer Name and Ticker or Trading Symbol
BIOGEN INC. [ BIIB ]
3a. Foreign Trading Symbol
5. If Amendment, Date of Original Filed (Month/Day/Year)
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Legal Officer
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year)3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
Remarks:
Power of Attorney is attached hereto as Exhibit 24.
No securities are beneficially owned.
/s/ Wendell Taylor, attorney-in-fact for Mr. Parini08/12/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)