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

Rhea-AI Filing Summary

Jeffrey Tuder, a Class III Director of GCT Semiconductor Holding, Inc. (GCTS), was granted 18,092 restricted stock units (RSUs) on 09/30/2025. Each RSU represents the right to one share of common stock payable in shares under a deferral election, and the award was recorded at a $0 transaction price. After this grant, the reporting person beneficially owned 94,893 shares.

The number of shares issued under the RSU award is determined quarterly by dividing $27,500 by the fair market value per share; the FMV used on 09/30/2025 was $1.52. The RSUs vest on 03/31/2026, subject to continued service, and restricted stock units have no expiration date.

Insights

Compensation Expert

Grant is standard time‑based equity compensation with a March 31, 2026 vest date.

The filing shows a 09/30/2025 award of 18,092 RSUs that will vest on 03/31/2026 subject to continued service, indicating the award is retention‑focused rather than immediately liquid. The award size is determined by dividing $27,500 by the quarterly fair market value, which was $1.52 on 09/30/2025.

This structure—quarterly share calculation with a single vest date and payment in shares—aligns with common director compensation practices disclosed here and creates a future issuance of shares upon vesting.

Corporate Governance Expert

Director received an equity grant reported under Section 16; ownership now totals 94,893 shares.

The Form 4 reports the grant at $0 price and a post‑transaction beneficial ownership of 94,893 shares for the reporting person, confirming timely disclosure of insider activity. The RSUs are payable in common stock per the reporting person’s deferral election, and no expiration date applies to the units.

If monitoring is needed, the concrete milestone disclosed is the vesting date of 03/31/2026.

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
Estimated average burden
hours per response:			0.5

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

1. Name and Address of Reporting Person^*

TUDER JEFFREY

(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
	Officer (give title below)	X	Other (specify below)
			Class III Director

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2025

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	09/30/2025		A		18,092(1)(2)(3)(4)	A	$0	94,893	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. Each Restricted Stock Unit ("RSU") represents the right to receive one share of common stock, par value $0.0001 per share ("Common Stock") of GCT Semiconductor Holding, Inc. (the "Issuer") following vesting. The RSUs become payable in Common Stock in accordance with a deferral election made by the reporting person.

2. The number of shares subject to and issuable under the award is determined on the last day of each calendar quarter during the period April 1, 2025 through March 31, 2026 (beginning with the quarter ending June 30, 2025) by dividing $27,500 by the fair market value per share of Common Stock, which was determined to be $1.52 on September 30, 2025, rounded down to the nearest whole share.

3. The RSUs will vest on March 31, 2026, subject to continued service through such date.

4. No expiration date is applicable to restricted stock units.

	/s/ Jeffrey Tuder	10/03/2025
	** 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 Jeffrey Tuder report on Form 4 for GCTS?

He reported a grant of 18,092 RSUs on 09/30/2025, increasing his beneficial ownership to 94,893 shares.

When do the RSUs granted to the GCTS director vest?

The RSUs vest on 03/31/2026, subject to the reporting person's continued service through that date.

How was the number of shares under the RSU award determined?

Each quarter the number is calculated by dividing $27,500 by the fair market value per share; the FMV used on 09/30/2025 was $1.52.

Will the RSUs expire?

No expiration date is applicable to these restricted stock units as disclosed in the filing.

How will the RSUs be settled?

The RSUs represent the right to receive one share of common stock per RSU and will be payable in common stock in accordance with the reporting person's deferral election.