George Golumbeski

Insider

First SEC filing: June 5, 2026 · Latest: June 5, 2026

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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

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 23 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

23 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 3, 2026	ABOS	A	35,500	—	—	35,500	—	—	(price as of 2026-08-21)
May 29, 2026	STTK	A	81,000	—	—	81,000 Direct	—	Acquired	(price as of 2026-08-21)
July 14, 2025	STTK	A	33,150	—	—	33,150 Direct	—	Acquired	(price as of 2026-08-21)
June 21, 2024	STTK	A	27,700	—	—	27,700 Direct	—	Acquired	(price as of 2026-08-21)
May 26, 2023	STTK	A	40,258	—	—	40,258 Direct	—	Acquired	(price as of 2026-08-21)
June 8, 2022	STTK	A	40,258	—	—	40,258 Direct	—	Acquired	(price as of 2026-08-21)
April 26, 2022	STTK	P	28,330	$3.63	$102,838	54,613 Direct	+107.79%	Acquired	102.2% (price as of 2026-08-21)
April 22, 2022	STTK	P	234	$3.67	$859	26,283 Direct	+0.90%	Acquired	100.0% (price as of 2026-08-21)
April 21, 2022	STTK	P	26,049	$3.69	$96,121	26,049 Direct	—	Acquired	98.9% (price as of 2026-08-21)
June 19, 2021	STTK	A	3,434	—	—	3,434 Direct	—	Acquired	(price as of 2026-08-21)
Dec. 22, 2020	STTK	A	1,286	—	—	1,286 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 26, 2020	ENTA	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-21)
March 4, 2019	ENTA	M	9,280	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
March 4, 2019	ENTA	S 10b5-1	9,280	$103.65	$961,872	0 Direct	-100.00%	Disposed	-87.3% (price as of 2026-08-21)
March 4, 2019	ENTA	M	9,280	$36.61	$339,741	9,280 Direct	—	Acquired	-63.9% (price as of 2026-08-21)
Feb. 28, 2019	ENTA	A	5,000	—	—	5,000 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 12, 2019	ENTA	M	7,500	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Feb. 12, 2019	ENTA	M	3,728	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Feb. 12, 2019	ENTA	S 10b5-1	11,228	$90.07	$1,011,306	0 Direct	-100.00%	Disposed	-85.3% (price as of 2026-08-21)
Feb. 12, 2019	ENTA	M	7,500	$29.02	$217,650	11,228 Direct	+201.18%	Acquired	-54.5% (price as of 2026-08-21)
Feb. 12, 2019	ENTA	M	3,728	$25.58	$95,362	3,728 Direct	—	Acquired	-48.4% (price as of 2026-08-21)
Feb. 11, 2019	ENTA	M	2,272	—	—	3,728 Direct	-37.87%	Disposed	(price as of 2026-08-21)
Feb. 11, 2019	ENTA	S 10b5-1	2,272	$90.03	$204,548	0 Direct	-100.00%	Disposed	-85.3% (price as of 2026-08-21)
Feb. 11, 2019	ENTA	M	2,272	$25.58	$58,118	2,272 Direct	—	Acquired	-48.4% (price as of 2026-08-21)
Feb. 28, 2018	ENTA	A	7,500	—	—	7,500 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 16, 2017	ENTA	A	7,500	—	—	7,500 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 11, 2016	ENTA	A	6,000	—	—	6,000 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 19, 2015	ENTA	A	6,000	—	—	6,000 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 7, 2014	ENTA	A	9,280	—	—	9,280 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
May 29, 2026	STTK	Stock Option (Right to Buy)	Common Stock (81,000)	$5.95	May 29, 2036	81,000	Acquired
July 14, 2025	STTK	Stock Option (Right to Buy)	Common Stock (33,150)	$0.82	July 14, 2035	33,150	Acquired
June 21, 2024	STTK	Stock Option (Right to Buy)	Common Stock (27,700)	$4.37	June 21, 2034	27,700	Acquired
May 26, 2023	STTK	Stock Option (Right to Buy)	Common Stock (40,258)	$2.72	May 26, 2023	40,258	Acquired
June 8, 2022	STTK	Stock Option (Right to Buy)	Common Stock (40,258)	$4.32	June 8, 2032	40,258	Acquired
June 19, 2021	STTK	Stock Option (Right to Buy)	Common Stock (3,434)	$29.34	June 19, 2031	3,434	Acquired
Dec. 22, 2020	STTK	Stock Option (Right to Buy)	Common Stock (1,286)	$53.02	Dec. 22, 2030	1,286	Acquired
Feb. 26, 2020	ENTA	Stock Option (right to buy)	Common Stock (10,000)	$51.04	Feb. 26, 2030	10,000	Acquired
March 4, 2019	ENTA	Stock Option (Right to Buy)	Common Stock (9,280)	$36.61	Feb. 7, 2024	9,280	Disposed
Feb. 28, 2019	ENTA	Stock Option (right to buy)	Common Stock (5,000)	$102.54	Feb. 28, 2029	5,000	Acquired
Feb. 12, 2019	ENTA	Stock Option (Right to Buy)	Common Stock (7,500)	$29.02	Feb. 16, 2027	7,500	Disposed
Feb. 12, 2019	ENTA	Stock Option (Right to Buy)	Common Stock (3,728)	$25.58	Feb. 11, 2026	3,728	Disposed
Feb. 11, 2019	ENTA	Stock Option (Right to Buy)	Common Stock (2,272)	$25.58	Feb. 11, 2026	2,272	Disposed
Feb. 28, 2018	ENTA	Stock Option (right to buy)	Common Stock (7,500)	$78.62	Feb. 28, 2028	7,500	Acquired
Feb. 16, 2017	ENTA	Stock Option (right to buy)	Common Stock (7,500)	$29.02	Feb. 16, 2027	7,500	Acquired
Feb. 11, 2016	ENTA	Stock Option (right to bury)	Common Stock (6,000)	$25.58	Feb. 11, 2026	6,000	Acquired
Feb. 19, 2015	ENTA	Stock Option (right to bury)	Common Stock (6,000)	$33.65	Feb. 19, 2025	6,000	Acquired
Feb. 7, 2014	ENTA	Stock Option (right to bury)	Common Stock (9,280)	$36.61	Feb. 7, 2024	9,280	Acquired

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

Initial ownership (Form 3) 4 holdings

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

Date	Ticker	Security	Shares	Ownership
Oct. 8, 2020	STTK	Stock Option (Right to Buy)→ Common Stock (52,745)	52,745	Direct
Oct. 8, 2020	STTK	Stock Option (Right to Buy)→ Common Stock (30,825)	30,825	Direct
Oct. 8, 2020	STTK	Stock Option (Right to Buy)→ Common Stock (17,125)	17,125	Direct
Oct. 8, 2020	STTK	Stock Option (Right to Buy)→ Common Stock (27,400)	27,400	Direct