GCT Semiconductor Holding, Inc. (GCTS) Insider Ownership

Historic Insider Ownership Trends

GCT Semiconductor Holding's three largest insider shareholders as of March 23, 2026 are Inc. Anapass, (TenPercentOwner, 8.02Mn shares), Kyeongho Lee (Director, 1.06Mn shares), Hyunsoo Shin (Director, 780.69K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Inc. Anapass, 8,017,466 0 27 Sep, 2024
Kyeongho Lee 1,062,741 0 05 Jan, 2026
Hyunsoo Shin 780,687 0 05 Jan, 2026
Sponsor Group Iii Llc Concord 632,586 0 28 Mar, 2025
Jeong-Min Kim Chief Technology Officer 302,701 0 22 Sep, 2025
John Schlaefer President, Ceo Class Iii Dir 202,728 0 30 Sep, 2025
Alex Sum Sr. Vp Of Sales And Marketing 183,743 0 22 Sep, 2025
Robert Barker 118,329 0 05 Jan, 2026
Jeffrey Tuder 117,809 0 05 Jan, 2026
Kukjin Chun 65,255 0 06 Mar, 2026
Peter Ort 30,000 0 17 Nov, 2023
Thomas C. King 30,000 0 17 Nov, 2023
Lawrence E Leibowitz 30,000 0 17 Nov, 2023
David Yoon Vice President Of Finance 8,204 0 27 Mar, 2024

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
23 Feb, 2026 Kukjin Chun Common Stock D 40,000 $0.00 65,255 D G
31 Dec, 2025 Hyunsoo Shin Common Stock A 22,916 $0.00 780,687 D A
31 Dec, 2025 Robert Barker Common Stock A 22,916 $0.00 118,329 D A
31 Dec, 2025 Jeffrey Tuder Common Stock A 22,916 $0.00 117,809 D A
31 Dec, 2025 Kyeongho Lee Common Stock A 22,916 $0.00 1,062,741 D A
31 Dec, 2025 Kukjin Chun Common Stock A 22,916 $0.00 105,255 D A
25 Nov, 2025 Hyunsoo Shin Common Stock A 16,725 $1.28 757,771 D P
20 Nov, 2025 Hyunsoo Shin Common Stock A 25,453 $1.28 737,866 D P
21 Nov, 2025 Hyunsoo Shin Common Stock A 3,180 $1.28 741,046 D P
30 Sep, 2025 Jeffrey Tuder Common Stock A 18,092 $0.00 94,893 D A
30 Sep, 2025 Kyeongho Lee Common Stock A 18,092 $0.00 1,039,825 D A
30 Sep, 2025 Robert Barker Common Stock A 18,092 $0.00 95,413 D A
30 Sep, 2025 Kukjin Chun Common Stock A 18,092 $0.00 82,339 D A
30 Sep, 2025 Hyunsoo Shin Common Stock A 18,092 $0.00 712,413 D A
26 Sep, 2025 John Schlaefer Common Stock, par value $0.0001 per share A 555 $0.00 202,728 D J
19 Sep, 2025 Jeong-Min Kim Common Stock, par value $0.0001 per share A 75,000 $0.00 302,701 D A
19 Sep, 2025 Alex Sum Common Stock, par value $0.0001 per share A 75,000 $0.00 183,743 D A
19 Sep, 2025 John Schlaefer Common Stock, par value $0.0001 per share A 75,000 $0.00 202,173 D A
12 Sep, 2025 Hyunsoo Shin Common Stock A 44,067 $1.51 694,321 D P
04 Sep, 2025 Hyunsoo Shin Common Stock A 8,250 $1.26 639,954 D P