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

Rhea-AI Filing Summary

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.

Positive

• Time-based RSU award aligns the Sr. VP's interests with the company's long-term performance through four-year vesting
• Grant represents future share ownership (75,000 RSUs convert to one share each upon vesting) which increases insider alignment
• No cash proceeds were received by the reporting person (grant price reported as $0), indicating compensation rather than a sale

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: A time-based RSU award to a senior officer aligns compensation with retention and future service.

The grant of 75,000 RSUs to the Sr. VP of Sales and Marketing is a standard equity-based retention and incentive mechanism. Vesting in equal annual installments over four years ties the executive to future performance and service milestones. The award has a $0 strike because these are RSUs (contingent rights to shares), not options; shares will be delivered upon vesting. The filing shows current beneficial ownership of 183,743 shares after the award, which is useful for assessing insider alignment with shareholders.

Securities Analyst

TL;DR: The transaction is routine insider equity compensation with no immediate cash proceeds or exercised derivatives.

The Form 4 discloses a non-derivative grant (RSUs) executed 09/19/2025 with a reported price of $0 and vesting beginning 09/19/2026. There is no sale or purchase for cash reported, and no derivative exercises. For investors tracking insider activity, this indicates management incentivization rather than liquidity events. The filing does not provide information on tax withholding, settlement timing, or total outstanding share count, which limits quantitative impact assessment.

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^*

Sum Alex

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Sr. VP of Sales and Marketing

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	183,743	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 did GCTS insider Alex Sum receive on 09/19/2025?

Alex Sum was granted 75,000 restricted stock units (RSUs) on 09/19/2025, representing a contingent right to one share per RSU.

When do the RSUs granted to Alex Sum vest?

The RSUs vest in four equal 25% installments on each anniversary of the 09/19/2025 grant date, beginning 09/19/2026, subject to continued service.

How many shares did Alex Sum beneficially own after the grant?

Following the reported transaction, Alex Sum beneficially owned 183,743 shares according to the Form 4.

Was any cash paid for the RSU grant?

No cash payment was reported; the RSUs are shown with a $0 price in the filing.

What is Alex Sum's role at GCT Semiconductor Holding, Inc.?

The Form 4 lists Alex Sum as Sr. VP of Sales and Marketing and an officer of the issuer.