Spyridon Artavanis-Tsakonas

Insider

First SEC filing: June 10, 2013 · Latest: June 10, 2013

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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 Dec. 15, 2014

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 33 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

33 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
April 2, 2016	BIIB	M	975	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
April 2, 2016	BIIB	F	459	$260.54	$119,588	3,150 Direct	-12.72%	Disposed	-17.2% (price as of 2026-08-21)
April 2, 2016	BIIB	M	975	—	—	3,609 Direct	+37.02%	Acquired	(price as of 2026-08-21)
Feb. 23, 2016	BIIB	J	287	—	—	868 Direct	-24.85%	Disposed	(price as of 2026-08-21)
Feb. 23, 2016	BIIB	M	145	—	—	1,155 Direct	-11.15%	Disposed	(price as of 2026-08-21)
Feb. 23, 2016	BIIB	F	48	$258.99	$12,432	2,549 Direct	-1.85%	Disposed	-16.7% (price as of 2026-08-21)
Feb. 23, 2016	BIIB	M	145	—	—	2,597 Direct	+5.91%	Acquired	(price as of 2026-08-21)
Feb. 22, 2016	BIIB	A	6,800	—	—	6,800 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 12, 2016	BIIB	J	455	—	—	804 Direct	-36.14%	Disposed	(price as of 2026-08-21)
Feb. 12, 2016	BIIB	M	714	—	—	716 Direct	-49.93%	Disposed	(price as of 2026-08-21)
Feb. 12, 2016	BIIB	M	343	—	—	1,259 Direct	-21.41%	Disposed	(price as of 2026-08-21)
Feb. 12, 2016	BIIB	F	240	$247.22	$59,333	2,452 Direct	-8.92%	Disposed	-12.8% (price as of 2026-08-21)
Feb. 12, 2016	BIIB	M	714	—	—	2,692 Direct	+36.10%	Acquired	(price as of 2026-08-21)
Feb. 12, 2016	BIIB	F	112	$247.22	$27,689	1,978 Direct	-5.36%	Disposed	-12.8% (price as of 2026-08-21)
Feb. 12, 2016	BIIB	M	343	—	—	2,090 Direct	+19.63%	Acquired	(price as of 2026-08-21)
April 2, 2015	BIIB	M	975	—	—	975 Direct	-50.00%	Disposed	(price as of 2026-08-21)
April 2, 2015	BIIB	F	460	$412.44	$189,722	1,674 Direct	-21.56%	Disposed	-47.7% (price as of 2026-08-21)
April 2, 2015	BIIB	M	975	—	—	2,134 Direct	+84.12%	Acquired	(price as of 2026-08-21)
Feb. 23, 2015	BIIB	A	1,300	—	—	1,300 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 12, 2015	BIIB	J	311	—	—	1,602 Direct	-16.26%	Disposed	(price as of 2026-08-21)
Feb. 12, 2015	BIIB	M	487	—	—	1,913 Direct	-20.29%	Disposed	(price as of 2026-08-21)
Feb. 12, 2015	BIIB	M	714	—	—	1,430 Direct	-33.30%	Disposed	(price as of 2026-08-21)
Feb. 12, 2015	BIIB	F	159	$392.11	$62,345	1,159 Direct	-12.06%	Disposed	-45.0% (price as of 2026-08-21)
Feb. 12, 2015	BIIB	M	487	—	—	1,318 Direct	+58.60%	Acquired	(price as of 2026-08-21)
Feb. 12, 2015	BIIB	F	235	$392.11	$92,146	831 Direct	-22.05%	Disposed	-45.0% (price as of 2026-08-21)
Feb. 12, 2015	BIIB	M	714	—	—	1,066 Direct	+202.84%	Acquired	(price as of 2026-08-21)
Dec. 15, 2014	BIIB	S 10b5-1	1,981	$346.50	$686,416	352 Direct	-84.91%	Disposed	-37.8% (price as of 2026-08-21)
April 2, 2014	BIIB	M	975	—	—	1,950 Direct	-33.33%	Disposed	(price as of 2026-08-21)
April 2, 2014	BIIB	F	433	$309.70	$134,100	2,244 Direct	-16.17%	Disposed	-30.4% (price as of 2026-08-21)
April 2, 2014	BIIB	M	975	—	—	2,677 Direct	+57.29%	Acquired	(price as of 2026-08-21)
Feb. 12, 2014	BIIB	A	2,400	—	—	2,400 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 12, 2014	BIIB	M	714	—	—	2,144 Direct	-24.98%	Disposed	(price as of 2026-08-21)
Feb. 12, 2014	BIIB	F	239	$323.04	$77,207	1,702 Direct	-12.31%	Disposed	-33.2% (price as of 2026-08-21)
Feb. 12, 2014	BIIB	M	714	—	—	1,941 Direct	+58.19%	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
April 2, 2016	BIIB	Restricted Stock Unit	Common Stock (975)	$0.00	April 2, 2016	975	Disposed
Feb. 23, 2016	BIIB	Restricted Stock Unit	Common Stock (287)	$0.00	Feb. 23, 2018	287	Disposed
Feb. 23, 2016	BIIB	Restricted Stock Unit	Common Stock (145)	$0.00	Feb. 23, 2018	145	Disposed
Feb. 22, 2016	BIIB	Restricted Stock Unit	Common Stock (6,800)	$0.00	Feb. 22, 2019	6,800	Acquired
Feb. 12, 2016	BIIB	Restricted Stock Unit	Common Stock (455)	$0.00	Feb. 12, 2017	455	Disposed
Feb. 12, 2016	BIIB	Restricted Stock Unit	Common Stock (714)	$0.00	Feb. 12, 2017	714	Disposed
Feb. 12, 2016	BIIB	Restricted Stock Unit	Common Stock (343)	$0.00	Feb. 12, 2017	343	Disposed
April 2, 2015	BIIB	Restricted Stock Unit	Common Stock (975)	$0.00	April 2, 2016	975	Disposed
Feb. 23, 2015	BIIB	Restricted Stock Unit	Common Stock (1,300)	$0.00	Feb. 23, 2018	1,300	Acquired
Feb. 12, 2015	BIIB	Restricted Stock Unit	Common Stock (311)	$0.00	Feb. 12, 2017	311	Disposed
Feb. 12, 2015	BIIB	Restricted Stock Unit	Common Stock (487)	$0.00	Feb. 12, 2017	487	Disposed
Feb. 12, 2015	BIIB	Restricted Stock Unit	Common Stock (714)	$0.00	Feb. 12, 2017	714	Disposed
April 2, 2014	BIIB	Restricted Stock Unit	Common Stock (975)	$0.00	April 2, 2016	975	Disposed
Feb. 12, 2014	BIIB	Restricted Stock Unit	Common Stock (2,400)	$0.00	Feb. 12, 2017	2,400	Acquired
Feb. 12, 2014	BIIB	Restricted Stock Unit	Common Stock (714)	$0.00	Feb. 12, 2017	714	Disposed

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

Initial ownership (Form 3) 3 holdings

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

Date	Ticker	Security	Shares	Ownership
June 10, 2013	BIIB	Common Stock	1,227	Direct
June 10, 2013	BIIB	Restricted Stock Unit→ Common Stock (2,858)	2,858	Direct
June 10, 2013	BIIB	Restricted Stock Unit→ Common Stock (2,925)	2,925	Direct