[Form 4] GCT Semiconductor Holding, Inc. Insider Trading Activity

Rhea-AI Filing Summary

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.

Positive

• 75,000 RSUs granted to the reporting person on September 19, 2025
• Standard four‑year vesting in equal 25% annual installments beginning September 19, 2026
• Reporting person is President, CEO and Class III director, indicating alignment of leadership and equity ownership
• Beneficial ownership after grant: 202,173 shares as disclosed on the Form 4

Negative

• None.

Insights

Financial Analyst

TL;DR: CEO received a time‑based RSU award of 75,000 shares, aligning compensation with future service over four years.

The grant is a non‑derivative equity award that vests 25% annually beginning one year after grant, which is a standard time‑based retention structure. The post‑grant beneficial ownership of 202,173 shares indicates meaningful insider stake but the filing does not disclose total outstanding shares or grant value, so direct valuation or dilution impact cannot be determined from this Form 4 alone.

Corporate Governance Expert

TL;DR: Time‑based RSUs tie CEO incentives to continued service; vesting schedule is typical for senior executives.

The award’s four‑year cliff/anniversary vesting is consistent with common governance practices to promote retention. The filing clearly states the service condition for vesting and reports updated beneficial ownership. No performance conditions or accelerated vesting terms are disclosed in this document.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Schlaefer John

(Last) (First) (Middle)

C/O GCT SEMICONDUCTOR HOLDING, INC.

2290 NORTH 1ST STREET, SUITE 201

(Street)

SAN JOSE CA 95131

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
GCT Semiconductor Holding, Inc. [ GCTS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President, CEO & Class III Dir

3. Date of Earliest Transaction (Month/Day/Year)
09/19/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $0.0001 per share	09/19/2025		A(1)		75,000	A	$0	202,173	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents restricted stock units ("RSU"), which constitute a contingent right to receive one share of common stock, par value $0.0001 per share, of GCT Semiconductor Holding, Inc. The RSUs vest over four years in equal 25% installments on each anniversary of the September 19, 2025 grant date, commencing September 19, 2026, subject to the Reporting Person's continued service with the Issuer.

	/s/ Edmond Cheng, attorney-in-fact	09/22/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What equity award did GCTS CEO John Schlaefer receive?

The Form 4 discloses a grant of 75,000 restricted stock units (RSUs) to John Schlaefer on September 19, 2025.

When do the RSUs granted to John Schlaefer vest?

The RSUs vest over four years in equal 25% installments on each anniversary of the grant, beginning September 19, 2026, subject to continued service.

How many shares does the reporting person beneficially own after the transaction?

Following the reported transaction, the reporting person beneficially owns 202,173 shares of common stock.

What role does the reporting person hold at GCTS?

The reporting person is listed as President, CEO and Class III director of GCT Semiconductor Holding, Inc.

When was the Form 4 signed and filed?

The signature block shows the form was signed by an attorney‑in‑fact on September 22, 2025.