SEC FORM 3

SEC Form 3

FORM 3

UNITED 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

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1. Name and Address of Reporting Person^*

WIGGINS MARK C

(Last)

(First)

(Middle)

14 CAMBRIDGE CENTER

(Street)

CAMBRIDGE

02142

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
07/28/2004

3. Issuer Name and Ticker or Trading Symbol
BIOGEN IDEC INC [ BIIB ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	EVP - Business Development

5. If Amendment, Date of Original Filed (Month/Day/Year)

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 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)
Common Stock	$37,317.773	I	by Trust⁽¹⁾
Common Stock	19,158	D

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)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	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)
Stock Option (right-to-buy)	⁽²⁾	05/11/2008	Common Stock	9,950	$5.5833	D
Stock Option (right-to-buy)	⁽³⁾	01/12/2010	Common Stock	101,500	$35.2083	D
Stock Option (right-to-buy)	⁽⁴⁾	01/16/2011	Common Stock	68,250	$57.3333	D
Stock Option (right-to-buy)	⁽⁵⁾	01/23/2002	Common Stock	65,800	$65.06	D
Stock Option (right-to-buy)	⁽⁶⁾	01/21/2003	Common Stock	62,300	$35.37	D
Stock Option (right-to-buy)	⁽⁷⁾	02/06/2004	Common Stock	27,475	$43.5	D
Stock Option (right-to-buy)	⁽⁸⁾	06/15/2004	Common Stock	25,000	$59.39	D

Explanation of Responses:

1. Shares are held in a family trust of which the reporting person and his spouse are the trustees and beneficiaries.

2. Option became exercisable as to 25% of the optioned shares on 5/11/99 and as to the balance of the shares in 36 equal monthly installments thereafter.

3. Option became exercisable in 48 successive equal monthly installments upon the completion of each calendar month of service during the 4-year period from January 1, 2000 to December 31, 2003.

4. Option will become exercisable in 48 successive equal monthly installments upon the completion of each calendar month of service during the 4-year period from January 1, 2001 to December 31, 2004.

5. Option will become exercisable in 48 successive equal monthly installments upon the completion of each calendar month of service during the 4-year period from January 1, 2002 to December 31, 2005.

6. Option will become exercisable in 48 successive equal monthly installments upon the completion of each calendar month of service during the 4-year period from January 1, 2003 to December 31, 2006.

7. The stock option becomes exercisable in four (4) equal annual installments on 12/31/04, 12/31/05, 12/31/06 and 12/31/07.

8. The stock option became exercisable in four (4) equal annual installments, commencing one year after the grant date of 06/15/04.

Remarks:

	By: Benjamin S. Harshbarger For: Mark C. Wiggins	08/02/2004
	** Signature of Reporting Person	Date
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.