Michael Kowolenko

Insider

First SEC filing: Oct. 20, 2005 · Latest: Oct. 20, 2005

On this page

Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.
Initial holdings The stakes this person held when they first started reporting.

Insider at

BIIB selling July 25, 2007

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 19 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

19 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
July 25, 2007	BIIB	M 10b5-1	4,263	—	—	29,837 Direct	-12.50%	Disposed	(price as of 2026-08-21)
July 25, 2007	BIIB	M 10b5-1	8,438	—	—	14,062 Direct	-37.50%	Disposed	(price as of 2026-08-21)
July 25, 2007	BIIB	M 10b5-1	4,356	—	—	4,355 Direct	-50.01%	Disposed	(price as of 2026-08-21)
July 25, 2007	BIIB	M 10b5-1	3,450	—	—	3,450 Direct	-50.00%	Disposed	(price as of 2026-08-21)
July 25, 2007	BIIB	S 10b5-1	20,507	$58.00	$1,189,406	18,124 Direct	-53.08%	Disposed	271.8% (price as of 2026-08-21)
July 25, 2007	BIIB	M 10b5-1	4,263	$44.24	$188,595	38,631 Direct	+12.40%	Acquired	387.5% (price as of 2026-08-21)
July 25, 2007	BIIB	M 10b5-1	8,438	$43.50	$367,053	34,368 Direct	+32.54%	Acquired	395.7% (price as of 2026-08-21)
July 25, 2007	BIIB	M 10b5-1	4,356	$37.45	$163,132	25,930 Direct	+20.19%	Acquired	475.8% (price as of 2026-08-21)
July 25, 2007	BIIB	M 10b5-1	3,450	$42.12	$145,314	21,574 Direct	+19.04%	Acquired	412.0% (price as of 2026-08-21)
March 20, 2007	BIIB	S 10b5-1	3,756	$44.48	$167,067	17,966 Direct	-17.29%	Disposed	384.8% (price as of 2026-08-21)
March 14, 2007	BIIB	F	2,469	$44.11	$108,908	21,722 Direct	-10.21%	Disposed	388.9% (price as of 2026-08-21)
March 14, 2007	BIIB	A	6,225	—	—	24,191 Direct	+34.65%	Acquired	(price as of 2026-08-21)
Feb. 13, 2007	BIIB	S 10b5-1	8,828	$49.22	$434,514	17,966 Direct	-32.95%	Disposed	338.1% (price as of 2026-08-21)
Feb. 12, 2007	BIIB	A	45,300	—	—	45,300 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 12, 2007	BIIB	A	17,500	—	—	26,794 Direct	+188.29%	Acquired	(price as of 2026-08-21)
Feb. 6, 2007	BIIB	D	4,534	—	—	9,066 Direct	-33.34%	Disposed	(price as of 2026-08-21)
Feb. 6, 2007	BIIB	F	4,206	$48.94	$205,842	9,294 Direct	-31.16%	Disposed	340.6% (price as of 2026-08-21)
Feb. 6, 2007	BIIB	M	4,534	—	—	13,500 Direct	+50.57%	Acquired	(price as of 2026-08-21)
Sept. 19, 2006	BIIB	S 10b5-1	770	$42.70	$32,879	8,899 Direct	-7.96%	Disposed	405.0% (price as of 2026-08-21)
Sept. 19, 2006	BIIB	S 10b5-1	1,117	$42.72	$47,718	9,369 Direct	-10.65%	Disposed	404.8% (price as of 2026-08-21)
Sept. 19, 2006	BIIB	S 10b5-1	2,514	$42.75	$107,474	10,487 Direct	-19.34%	Disposed	404.4% (price as of 2026-08-21)
Sept. 19, 2006	BIIB	S 10b5-1	2,514	$42.77	$107,524	13,000 Direct	-16.20%	Disposed	404.2% (price as of 2026-08-21)
Sept. 19, 2006	BIIB	S 10b5-1	2,514	$42.80	$107,599	15,514 Direct	-13.94%	Disposed	403.9% (price as of 2026-08-21)
Sept. 19, 2006	BIIB	S 10b5-1	2,514	$42.84	$107,700	18,328 Direct	-12.06%	Disposed	403.4% (price as of 2026-08-21)
Sept. 14, 2006	BIIB	F	5,557	$43.39	$241,118	20,842 Direct	-21.05%	Disposed	397.0% (price as of 2026-08-21)
Sept. 14, 2006	BIIB	A	17,500	—	—	26,399 Direct	+196.65%	Acquired	(price as of 2026-08-21)
Feb. 6, 2006	BIIB	A	13,600	—	—	13,600 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 6, 2006	BIIB	A	34,100	—	—	34,100 Direct	—	Acquired	(price as of 2026-08-21)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
July 25, 2007	BIIB	Stock Option (Right to buy)	Common Stock (4,263)	$44.24	Feb. 6, 2016	4,263	Disposed
July 25, 2007	BIIB	Stock Option (Right to buy)	Common Stock (8,438)	$43.50	Feb. 6, 2014	8,438	Disposed
July 25, 2007	BIIB	Stock Option (Right to buy)	Common Stock (4,356)	$37.45	Dec. 6, 2012	4,356	Disposed
July 25, 2007	BIIB	Stock Option (Right to buy)	Common Stock (3,450)	$42.12	April 1, 2012	3,450	Disposed
Feb. 12, 2007	BIIB	Stock Option (right-to-buy) [F2]	Common Stock (45,300)	$49.31	Feb. 11, 2017	45,300	Acquired
Feb. 6, 2007	BIIB	Restricted Stock Unit	Common Stock (4,534)	—	Feb. 6, 2007	4,534	Disposed
Feb. 6, 2006	BIIB	Restricted Stock Units	Common Stock (13,600)	—	—	13,600	Acquired
Feb. 6, 2006	BIIB	Stock Option (right-to-buy) [F2]	Common Stock (34,100)	$44.24	Feb. 5, 2016	34,100	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 6 holdings

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
Oct. 20, 2005	BIIB	Common Stock	—	Direct
Oct. 20, 2005	BIIB	Stock Option (right-to-buy) [F2]→ Common Stock (6,900)	6,900	Direct
Oct. 20, 2005	BIIB	Stock Option (right-to-buy) [F2]→ Common Stock (8,711)	8,711	Direct
Oct. 20, 2005	BIIB	Stock Option (right-to-buy) [F2]→ Common Stock (22,500)	22,500	Direct
Oct. 20, 2005	BIIB	Stock Option (right-to-buy) [F2]→ Common Stock (5,000)	5,000	Direct
Oct. 20, 2005	BIIB	Stock Option (right-to-buy) [F2]→ Common Stock (35,000)	35,000	Direct