GCT Semiconductor Holding, Inc. (GCTS)
NYSE: GCTS · Semiconductors & Related Devices · San Jose, CA · filing with the SEC since 2021
Who owns GCT Semiconductor Holding, Inc.
As filed with the SECHolders of 5% or more
1
SUNP Corp holds 5.2% of Common Stock, par value $0.0001 per share, as its SCHEDULE 13G/A filed Aug 22, 2025 says.
Directors and officers
10
report now, of 16 people on the record since 2021. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 1 named at left.
Holders of 5% or moreshare of the class, as filed
SUNP Corp
SCHEDULE 13G/A · filed Aug 22, 2025 · Common Stock, par value $0.0001 per share · 8.3% in Apr 15, 2025
Td Securities (Usa) LLC
SCHEDULE 13G/A · filed May 15, 2026 · Common Stock, par value $0.0001 per share · reported falling below 5%, from 6.1% in Feb 13, 2026
Concord Sponsor Group III LLC
SCHEDULE 13G/A · filed Mar 28, 2025 · Common Stock, par value $0.0001 per share · reported falling below 5%
What GCTS reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
Concord Acquisition Corp III
An entity · legal entity · owns, named in the 10-K filed Mar 25, 2026
Insider tradesForm 4
0sales
3purchases
0sales on a scheduled plan
0people selling
$0sold, in dollars
$100,000bought, in dollars
Open-market trades on Form 4 from Oct 2, 2025 to Oct 2, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2025 runs to Oct 2, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window1 of 18 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Shin Hyunsoo | Class II Director | 0 | $0 | 0 | 3 | $100,000 |