FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

SHERWIN STEPHEN A
2. Issuer Name and Ticker or Trading Symbol

BIOGEN INC. [ BIIB ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    _____ 10% Owner
_____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle)

BIOGEN INC., 225 BINNEY STREET
3. Date of Earliest Transaction (MM/DD/YYYY)

3/11/2020
(Street)

CAMBRIDGE, MA 02142
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 3/11/2020  M(1)  10923 (2)A$58.46 (2)16517 D  
Common Stock 3/11/2020  S(1)  2164 D$295.215 14353 D  
Common Stock 3/11/2020  M(1)  1355 (3)A$58.46 (3)15708 D  
Common Stock 3/11/2020  S(1)  270 D$295.29 15438 D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (Right to Buy) $59.82 (2)(4)3/11/2020  M (1)    10923 (2)  (5)3/22/2020 Common Stock 10923 (2) (2)0 D  
Stock Option (Right to Buy) $59.82 (3)(4)3/11/2020  M (1)    1355 (3) 3/22/2011 3/22/2020 Common Stock 1355 (3) (3)0 D  

Explanation of Responses:
(1) Exercise/sale pursuant to a trading plan intended to comply with Rule 10b5-1 of the Securities Exchange Act of 1934.
(2) This option was previously reported as covering 10,675 shares at an exercise price of $59.82 per share, but was adjusted pursuant to the anti-dilution provisions of the award in connection with the spin-off of Bioverativ Inc. on February 1, 2017.
(3) This option was previously reported as covering 1,325 shares at an exercise price of $59.82 per share, but was adjusted pursuant to the anti-dilution provisions of the award in connection with the spin-off of Bioverativ Inc. on February 1, 2017.
(4) Granted under one of the Issuer's stock option plans, in an exempt transaction under SEC Rule 16(b)-3(d).
(5) The stock options become exercisable in three (3) equal annual installments commencing one year after the grant date of 03/22/2010.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
SHERWIN STEPHEN A
BIOGEN INC.
225 BINNEY STREET
CAMBRIDGE, MA 02142
X



Signatures
/s/ Suzanne Murray, Attorney in Fact for Stephen Sherwin3/12/2020
**Signature of Reporting PersonDate

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