GCT Semiconductor grants Chun 12,971 stock units

The restricted stock units vest on March 31, 2027, subject to continued service, and are payable in common stock under a deferral election.

Rhea-AI Filing Summary

GCT Semiconductor Holding, Inc. (GCTS) reported that Class I Director Kukjin Chun acquired 12,971 restricted stock units on September 30, 2026. The award was calculated using a $27,500 amount and a $2.12 per-share fair market value. The units vest on March 31, 2027, subject to continued service, and are payable in common stock under a deferral election. Chun's reported resulting position was 111,607 shares.

Insider Trade Summary

Grant/Award: 12,971 shares

Grant/Award 1 txn

Insider Chun Kukjin

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1, F2, F3, F4	12,971	$0.00	$0.00

Holdings After Transaction: Common Stock — 111,607 shares (Direct)

Footnotes (4)

1. F1. 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. F2. 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, 2026 through March 31, 2027 (beginning with the quarter ending June 30, 2026) by dividing $27,500 by the fair market value per share of Common Stock, which was determined to be $2.12 on September 30, 2026, rounded down to the nearest whole share.
3. F3. The RSUs will vest on March 31, 2027, subject to continued service through such date.
4. F4. No expiration date is applicable to restricted stock units.

Key Figures

Restricted stock units acquired: 12,971 RSUs Award amount used in calculation: $27,500 Fair market value: $2.12 per share +1 more

4 metrics

Restricted stock units acquired 12,971 RSUs September 30, 2026

Award amount used in calculation $27,500 Used to determine the number of RSUs for the calendar quarter

Fair market value $2.12 per share September 30, 2026

Reported resulting position 111,607 shares Following the reported transaction

Key Terms

Restricted Stock Unit, deferral election, fair market value

3 terms

Restricted Stock Unit financial

"Each Restricted Stock Unit ("RSU") represents the right to receive one share"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

deferral election financial

"in accordance with a deferral election made by the reporting person"

fair market value financial

"by the fair market value per share of Common Stock"

The price a willing buyer and a willing seller would agree on for an asset or security when neither is under pressure and both have access to the same information. Think of it as the market’s neutral estimate of what something is worth, like the price two neighbors would settle on for a car after comparing similar listings. Investors care because fair market value guides buying and selling decisions, tax reporting, portfolio valuation, and how accurately company assets are reflected in financial statements.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many RSUs did GCTS director Kukjin Chun receive?

Kukjin Chun, a Class I Director, received 12,971 restricted stock units on September 30, 2026. The reported resulting position was 111,607 shares.

When do Kukjin Chun's GCTS RSUs vest?

The RSUs vest on March 31, 2027, subject to continued service through that date. They become payable in common stock in accordance with a deferral election made by Kukjin Chun.

How were Kukjin Chun's GCTS RSUs calculated?

The number of RSUs was determined by dividing $27,500 by the common stock's fair market value on the last day of each calendar quarter from April 1, 2026 through March 31, 2027, beginning with the quarter ending June 30, 2026, and rounding down to a whole share. The September 30, 2026 fair market value was $2.12 per share.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/02/2026 - 05:32 PM Accepted by SEC EDGAR 10/02/2026 - 05:32 PM Learn about SEC filing dates

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).

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^*

Chun Kukjin

(Last) (First) (Middle)

C/O GCT SEMICONDUCTOR HOLDING, INC.

2290 NORTH 1ST STREET, SUITE 201

(Street)

SAN JOSE CALIFORNIA 95131

(City) (State) (Zip)

UNITED STATES

(Country)

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 I Director

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2026

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

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

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

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	09/30/2026		A		12,971(1)(2)(3)(4)	A	$0	111,607	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, 2026 through March 31, 2027 (beginning with the quarter ending June 30, 2026) by dividing $27,500 by the fair market value per share of Common Stock, which was determined to be $2.12 on September 30, 2026, rounded down to the nearest whole share.

3. The RSUs will vest on March 31, 2027, subject to continued service through such date.

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

	/s/ Edmond Cheng, attorney-in-fact	10/02/2026
	** 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.
* Form 4: SEC 1474 (03-26)