Welcome to our dedicated page for GCT Semiconductor Holding SEC filings (Ticker: GCTS), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
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John Schlaefer, President, CEO and Class III Director of GCT Semiconductor Holding, Inc. (GCTS), received a distribution of 555 shares of common stock on 09/26/2025 from Parakletos @ Venture Millennium Fund LP for no consideration. After the transaction the reporting person beneficially owns 202,728 shares, held directly. The Form 4 was signed by an attorney-in-fact, Edmond Cheng, on 09/30/2025. The filing documents an insider acquisition that modestly increases the reporting person’s direct stake in the company.
Kim Jeong-Min, Chief Technology Officer of GCT Semiconductor Holding, Inc. (GCTS), was granted 75,000 restricted stock units (RSUs) on 09/19/2025. The RSUs are a contingent right to receive one share of common stock each and vest in four equal annual installments of 25% beginning on 09/19/2026, subject to continued service. After the grant the reporting person beneficially owned 302,701 shares. The Form 4 was signed by an attorney-in-fact on 09/22/2025. The filing documents a standard executive equity award intended for retention and aligns the officer’s compensation with shareholder value.
GCT Semiconductor Holding, Inc. reported a grant of 75,000 restricted stock units (RSUs) to John Schlaefer, who serves as President, CEO and a Class III director. The RSUs were granted on September 19, 2025 and vest over four years in equal 25% installments on each anniversary beginning September 19, 2026, subject to continued service. After the grant, the reporting person beneficially owns 202,173 shares of common stock. The Form 4 was signed by an attorney-in-fact on September 22, 2025.
Edmond Cheng, Chief Financial Officer of GCT Semiconductor Holding, Inc. (GCTS), was granted 75,000 restricted stock units (RSUs) on 09/19/2025. The RSUs are a contingent right to receive common stock and carry a $0 grant price. They vest over four years in equal 25% installments on each anniversary of the grant, beginning 09/19/2026, subject to continued service. After this transaction the reporting person beneficially owns 151,000 shares (directly). The filing documents the standard Section 16 disclosure of an executive equity award and shows the company’s use of time‑based RSUs for retention.
Alex Sum, Sr. VP of Sales and Marketing at GCT Semiconductor Holding, Inc. (GCTS), was granted 75,000 restricted stock units (RSUs) on 09/19/2025. The RSUs carry a $0 grant price and represent a contingent right to one share of common stock each. They vest in four equal annual installments (25% each) beginning on 09/19/2026, subject to continued service. After the grant, the reporting person beneficially owned 183,743 shares. The Form 4 was signed by an attorney-in-fact on 09/22/2025.
Insider purchase by director. GCT Semiconductor Holding director Shin Hyunsoo purchased 44,067 shares of common stock on 09/12/2025 at $1.51 per share, increasing his direct holdings to 694,321 shares. The filing reports only a non-derivative acquisition and lists no derivative transactions. The Form 4 was signed by an attorney-in-fact on behalf of the reporting person.
GCT Semiconductor Holding director Hyunsoo Shin reported purchases of common stock on September 4-5, 2025, acquiring 8,250 shares at $1.26 and 10,300 shares at $1.30 respectively, increasing his beneficial ownership to 650,254 shares. The Form 4 was signed by an attorney-in-fact and shows direct ownership; no derivative transactions were reported.
SUNP Corporation filed an amendment to Schedule 13G reporting ownership of 2,910,870 shares of GCT Semiconductor Holding, Inc. Common Stock, representing 5.2% of the outstanding class based on 55,859,904 shares. The filing shows SUNP has sole voting and dispositive power over 2,605,109 shares and shared voting and dispositive power over 305,761 shares. The shares are directly held by several SUNP subsidiaries, with SUNP retaining voting/dispositive authority as disclosed. The filing includes a certification that the stake was not acquired to influence control.
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