Hyunsoo Shin

CIK 2007757 · View on SEC EDGAR ↗

Insider

First SEC filing: Dec. 16, 2024 · Latest: Dec. 16, 2024

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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.

Insider at

GCTS buying Nov. 25, 2025

Insider transactions

6 buys (P) 0 sells (S) Net: $148,384 + 15 non-open-market transactions below Avg return of open purchases vs now: 51.3% 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

15 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 30, 2026	GCTS	A	9,259	—	—	814,068 Direct	+1.15%	Acquired	(price as of 2026-08-20)
March 31, 2026	GCTS	A	24,122	—	—	804,809 Direct	+3.09%	Acquired	(price as of 2026-08-20)
Dec. 31, 2025	GCTS	A	22,916	—	—	780,687 Direct	+3.02%	Acquired	(price as of 2026-08-20)
Nov. 25, 2025	GCTS	P	16,725	$1.28	$21,408	757,771 Direct	+2.26%	Acquired	55.2% (price as of 2026-08-20)
Nov. 21, 2025	GCTS	P	3,180	$1.28	$4,070	741,046 Direct	+0.43%	Acquired	55.2% (price as of 2026-08-20)
Nov. 20, 2025	GCTS	P	25,453	$1.28	$32,580	737,866 Direct	+3.57%	Acquired	55.2% (price as of 2026-08-20)
Sept. 30, 2025	GCTS	A	18,092	—	—	712,413 Direct	+2.61%	Acquired	(price as of 2026-08-20)
Sept. 12, 2025	GCTS	P	44,067	$1.51	$66,541	694,321 Direct	+6.78%	Acquired	31.6% (price as of 2026-08-20)
Sept. 5, 2025	GCTS	P	10,300	$1.30	$13,390	650,254 Direct	+1.61%	Acquired	52.8% (price as of 2026-08-20)
Sept. 4, 2025	GCTS	P	8,250	$1.26	$10,395	639,954 Direct	+1.31%	Acquired	57.7% (price as of 2026-08-20)
Aug. 15, 2025	GCTS	P	121,000	$1.26	$152,460	631,704 Direct	+23.69%	Acquired	57.7% (price as of 2026-08-20)
June 30, 2025	GCTS	A	18,456	—	—	510,704 Direct	+3.75%	Acquired	(price as of 2026-08-20)
June 10, 2025	GCTS	P	45,000	$1.16	$52,200	492,248 Direct	+10.06%	Acquired	71.3% (price as of 2026-08-20)
June 10, 2025	GCTS	P	40,000	$1.20	$48,000	447,248 Direct	+9.82%	Acquired	65.5% (price as of 2026-08-20)
June 5, 2025	GCTS	P	21,300	$1.02	$21,726	407,248 Direct	+5.52%	Acquired	94.8% (price as of 2026-08-20)
June 5, 2025	GCTS	P	58,700	$1.03	$60,461	385,948 Direct	+17.94%	Acquired	92.9% (price as of 2026-08-20)
June 4, 2025	GCTS	P	80,000	$1.02	$81,600	327,248 Direct	+32.36%	Acquired	94.8% (price as of 2026-08-20)
May 23, 2025	GCTS	P	77,000	$1.04	$80,080	247,248 Direct	+45.23%	Acquired	91.0% (price as of 2026-08-20)
May 20, 2025	GCTS	P	86,000	$1.18	$101,480	170,248 Direct	+102.08%	Acquired	68.3% (price as of 2026-08-20)
March 31, 2025	GCTS	A	16,768	—	—	84,248 Direct	+24.85%	Acquired	(price as of 2026-08-20)
Dec. 31, 2024	GCTS	A	11,802	—	—	67,693 Direct	+21.12%	Acquired	(price as of 2026-08-20)
Dec. 16, 2024	GCTS	A	37,000	$2.57	$95,090	55,891 Direct	+195.86%	Acquired	-22.7% (price as of 2026-08-20)
Dec. 13, 2024	GCTS	A	200	$2.50	$500	18,891 Direct	+1.07%	Acquired	-20.5% (price as of 2026-08-20)
Dec. 13, 2024	GCTS	A	800	$2.50	$2,000	18,691 Direct	+4.47%	Acquired	-20.5% (price as of 2026-08-20)
Sept. 30, 2024	GCTS	A	8,208	—	—	17,891 Direct	+84.77%	Acquired	(price as of 2026-08-20)
June 30, 2024	GCTS	A	5,278	—	—	9,683 Direct	+119.82%	Acquired	(price as of 2026-08-20)
March 26, 2024	GCTS	A	6,536	—	—	6,536 Direct	—	Acquired	(price as of 2026-08-20)
March 26, 2024	GCTS	A	3,735	—	—	3,735 Direct	—	Acquired	(price as of 2026-08-20)
March 26, 2024	GCTS	A	456	—	—	456 Direct	—	Acquired	(price as of 2026-08-20)

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
March 26, 2024	GCTS	Stock Option (Right to Buy)	Common Stock (6,536)	$0.11	Jan. 11, 2032	6,536	Acquired

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