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SEC FORM 4 SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

ROHN WILLIAM R

(Last)

(First)

(Middle)

C/O CERUS CORP

2411 STENWELL DRIVE

(Street)

CONCORD

94520

(City)

(State)

(Zip)

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

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

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
Exec VP & COO

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2004

4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction 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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. 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: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			4,700	01/01/2000⁽²⁾	01/12/2009	Common Stock	4,700	⁽¹⁾	215,175	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			200	01/01/2000⁽²⁾	01/12/2009	Common Stock	200	⁽¹⁾	214,975	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			6,600	01/01/2000⁽²⁾	01/12/2009	Common Stock	6,600	⁽¹⁾	208,375	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			4,900	01/01/2000⁽²⁾	01/12/2009	Common Stock	4,900	⁽¹⁾	203,475	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			1,300	01/01/2000⁽²⁾	01/12/2009	Common Stock	1,300	⁽¹⁾	202,175	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			700	01/01/2000⁽²⁾	01/12/2009	Common Stock	700	⁽¹⁾	201,475	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			5,200	01/01/2000⁽²⁾	01/12/2009	Common Stock	5,200	⁽¹⁾	196,275	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			5,000	01/01/2000⁽²⁾	01/12/2009	Common Stock	5,000	⁽¹⁾	191,275	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			2,300	01/01/2000⁽²⁾	01/12/2009	Common Stock	2,300	⁽¹⁾	188,975	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			3,700	01/01/2000⁽²⁾	01/12/2009	Common Stock	3,700	⁽¹⁾	185,275	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			100	01/01/2000⁽²⁾	01/12/2009	Common Stock	100	⁽¹⁾	185,175	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			400	01/01/2000⁽²⁾	01/12/2009	Common Stock	400	⁽¹⁾	184,775	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			200	01/01/2000⁽²⁾	01/12/2009	Common Stock	200	⁽¹⁾	184,575	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			1,600	01/01/2000⁽²⁾	01/12/2009	Common Stock	1,600	⁽¹⁾	182,975	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			700	01/01/2000⁽²⁾	01/12/2009	Common Stock	700	⁽¹⁾	182,275	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			500	01/01/2000⁽²⁾	01/12/2009	Common Stock	500	⁽¹⁾	181,775	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			200	01/01/2000⁽²⁾	01/12/2009	Common Stock	200	⁽¹⁾	181,575	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			6,700	01/01/2000⁽²⁾	01/12/2009	Common Stock	6,700	⁽¹⁾	174,875	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			11,500	01/01/2000⁽²⁾	01/12/2009	Common Stock	11,500	⁽¹⁾	163,375	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			200	01/01/2000⁽²⁾	01/12/2009	Common Stock	200	⁽¹⁾	163,175	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			200	01/01/2000⁽²⁾	01/12/2009	Common Stock	200	⁽¹⁾	162,975	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			400	01/01/2000⁽²⁾	01/12/2009	Common Stock	400	⁽¹⁾	162,575	D
Incentive Stock Option (right to buy)⁽¹⁾	$7.7188	03/02/2004		M			500	01/01/2000⁽²⁾	01/12/2009	Common Stock	500	⁽¹⁾	162,075	D

Explanation of Responses:

1. Granted under Issuer's Employee Stock Option Plan, in an exempt transaction under SEC rule 16b-3(d).

2. Option became exercisable as to 25% of the optioned shares on 1/01/2000 and as to the balance of the shares in 36 equal monthly installments thereafter.

	By: Pamela A. Blas For: William R. Rohn	03/04/2004
	** 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 4 (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).
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