GCT Semiconductor Holding GCTS-WT Insider Ownership

NYSE GCTS-WT
$0.30 -0.01 (-3.23%)
At close: Sep 11, 2026 · 4:00 PM EDT

Insider Holdings by Owner

20.04Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
0.227%
0% pp QoQ
Shares Held by Insiders
125.64K
filed for Sep 2026
0.00% QoQ
Shares Outstanding
55.46Mn
55,462,000 shares
Direct Holdings
125.64K
Indirect: 0
Net Shares Traded (QoQ)
0
no net change in Sep 2026
Insiders Holding Shares
15
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest
Average ownership
Peak ownership

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter
Net over range
Buying quarters
Form 4 Holdings

Insiders Holding GCTS-WT

Insiders 15
Shares held 20.04Mn
Of outstanding 36.13%
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 Sponsor Group Iii Llc Concord TenPercentOwner 8,590,312 0 8,590,312 42.9% 28 Mar, 2025
2 Inc. Anapass, TenPercentOwner 8,017,466 0 8,017,466 40.0% 27 Sep, 2024
3 Kyeongho Lee Director, Other 1,096,122 0 1,096,122 5.5% 02 Jul, 2026
4 Hyunsoo Shin Director, Other 817,803 0 817,803 4.1% 02 Jul, 2026
5 Jeong-Min Kim Chief Technology Officer 302,701 0 302,701 1.5% 22 Sep, 2025
6 Edmond Cheng Chief Financial Officer 227,000 0 227,000 1.1% 22 Sep, 2025
7 John Schlaefer President, Ceo Class Iii Dir 202,728 0 202,728 1.0% 30 Sep, 2025
8 Alex Sum Sr. Vp Of Sales And Marketing 183,743 0 183,743 0.9% 22 Sep, 2025
9 Robert Barker Director, Other 155,445 0 155,445 0.8% 02 Jul, 2026
10 Jeffrey Tuder Director, Other 151,190 0 151,190 0.8% 02 Jul, 2026
11 Nelson Chan Director, Other 125,642 0 125,642 0.6% 02 Apr, 2026
12 Kukjin Chun Director, Other 102,371 0 102,371 0.5% 02 Jul, 2026
13 Peter Ort Director 30,000 0 30,000 0.1% 17 Nov, 2023
14 Lawrence E Leibowitz Director 30,000 0 30,000 0.1% 17 Nov, 2023
15 David Yoon Vice President Of Finance 8,204 0 8,204 0.0% 27 Mar, 2024

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

223 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
30 Jun, 2026 Robert Barker Director, Other Acquired A 9,259 $0.00 $0 151,710 Direct
30 Jun, 2026 Kyeongho Lee Director, Other Acquired A 9,259 $0.00 $0 1,096,122 Direct
30 Jun, 2026 Kukjin Chun Director, Other Acquired A 9,259 $0.00 $0 98,636 Direct
30 Jun, 2026 Hyunsoo Shin Director, Other Acquired A 9,259 $0.00 $0 814,068 Direct
30 Jun, 2026 Jeffrey Tuder Director, Other Acquired A 9,259 $0.00 $0 151,190 Direct
31 Mar, 2026 Hyunsoo Shin Director, Other Acquired A 24,122 $0.00 $0 804,809 Direct
31 Mar, 2026 Robert Barker Director, Other Acquired A 24,122 $0.00 $0 142,451 Direct
31 Mar, 2026 Kukjin Chun Director, Other Acquired A 24,122 $0.00 $0 89,377 Direct
31 Mar, 2026 Nelson Chan Director, Other Acquired A 24,122 $0.00 $0 125,642 Direct
23 Feb, 2026 Kukjin Chun Director, Other Disposed G 40,000 $0.00 $0 65,255 Direct
31 Dec, 2025 Nelson Chan Director, Other Acquired A 22,916 $0.00 $0 101,520 Direct
31 Dec, 2025 Hyunsoo Shin Director, Other Acquired A 22,916 $0.00 $0 780,687 Direct
31 Dec, 2025 Kukjin Chun Director, Other Acquired A 22,916 $0.00 $0 105,255 Direct
31 Dec, 2025 Robert Barker Director, Other Acquired A 22,916 $0.00 $0 118,329 Direct
25 Nov, 2025 Hyunsoo Shin Director, Other Acquired P 16,725 $1.28 $21.41K 757,771 Direct
20 Nov, 2025 Hyunsoo Shin Director, Other Acquired P 25,453 $1.28 $32.58K 737,866 Direct
21 Nov, 2025 Hyunsoo Shin Director, Other Acquired P 3,180 $1.28 $4.07K 741,046 Direct
30 Sep, 2025 Hyunsoo Shin Director, Other Acquired A 18,092 $0.00 $0 712,413 Direct
30 Sep, 2025 Kukjin Chun Director, Other Acquired A 18,092 $0.00 $0 82,339 Direct
30 Sep, 2025 Robert Barker Director, Other Acquired A 18,092 $0.00 $0 95,413 Direct