BIOGEN IDEC INC|4Feb 22, 3:29 PM ET

BUCKNUM THOMAS J 4

4 · BIOGEN IDEC INC · Filed Feb 22, 2005

Form 4

Period: 2005-02-17

EVP and General Counsel

Transactions

Exercise/Conversion
Stock Option (right-to-buy)
2005-02-18−57,500→ 0 total
Exercise: $47.15Exp: 2009-06-10→ Common Stock (57,500 underlying)
Exercise/Conversion
Stock Option (right-to-buy)
2005-02-18−9,200→ 0 total
Exercise: $35.42Exp: 2008-12-11→ Common Stock (9,200 underlying)
Exercise/Conversion
Stock Option (right-to-buy)
2005-02-18−23,000→ 5,750 total
Exercise: $45.46Exp: 2010-12-15→ Common Stock (23,000 underlying)
Sale
Common Stock
2005-02-18$67.12/sh−9,200$617,542→ 0 total
Exercise/Conversion
Common Stock
2005-02-18$47.15/sh+57,500$2,711,125→ 57,500 total
Sale
Common Stock
2005-02-18$67.12/sh−57,500$3,859,636→ 0 total
Award
Stock Option (right-to-buy)
2005-02-17+55,000→ 55,000 total
Exercise: $67.57Exp: 2015-02-17→ Common Stock (55,000 underlying)
Exercise/Conversion
Common Stock
2005-02-18$35.42/sh+9,200$325,864→ 9,200 total
Exercise/Conversion
Common Stock
2005-02-18$45.46/sh+23,000$1,045,580→ 28,750 total
Sale
Common Stock
2005-02-18$67.12/sh−23,000$1,543,854→ 5,750 total

Holdings

Footnotes (5)

[F1]Granted under one of the Issuer's stock option plans, in an exempt transaction under SEC rule 16(b)-3(d).
[F2]The stock option became exercisable in five (5) equal annual installments, commencing one year after the grant date of 12/11/98.
[F3]The stock option became exercisable in five (5) equal annual installments, commencing one year after the grant date of 06/10/99.
[F4]The stock option becomes exercisable in five (5) equal annual installments, commencing one year after the grant date of 12/15/00.
[F5]The stock option becomes exercisable in four (4) equal annual installments, commencing one year after the grant date of 02/17/05.

Documents

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