GCT Semiconductor Form 4: Shin Hyunsoo Increases Stake to 631,704 Shares

Rhea-AI Filing Summary

Insider purchase reported for GCT Semiconductor Holding, Inc. (GCTS). Director Shin Hyunsoo acquired 121,000 shares of the company's common stock on 08/15/2025 at a price of $1.26 per share. Following the reported purchase, the reporting person beneficially owns 631,704 shares. The Form 4 was executed by attorney-in-fact Edmond Cheng and dated 08/19/2025. The filing identifies Shin Hyunsoo as a Class II Director and the form was filed by one reporting person.

Positive

• Director purchase disclosed: Shin Hyunsoo acquired 121,000 shares on 08/15/2025 at $1.26 per share.
• Increased beneficial ownership: Post-transaction holdings reported at 631,704 shares.
• Complete Form 4 disclosure: Filing includes transaction code, price, dates, and reporting person relationship.

Negative

• None.

Insights

Securities Analyst

TL;DR: A director made a non-derivative purchase of 121,000 shares at $1.26, increasing reported beneficial holdings.

The Form 4 documents a straightforward open-market purchase by Director Shin Hyunsoo on 08/15/2025. The transaction code "P" indicates a purchase, and the filing shows a post-transaction beneficial ownership of 631,704 shares. This is a factual disclosure of insider activity without additional context on intent, planned transactions, or changes to compensation. For investors, the filing confirms updated insider holdings but contains no other material corporate events or derivative activity.

Corporate Governance Expert

TL;DR: Corporate disclosure is complete for a standard insider purchase; no governance issues are identified in the filing.

The Form 4 appropriately identifies the reporting person, relationship to the issuer (Class II Director), transaction date, price, and resulting beneficial ownership. The signature block shows the form was signed by an attorney-in-fact, Edmond Cheng, on 08/19/2025. There are no amendments, derivative transactions, or indications of planned trading arrangements disclosed in this filing.

Insider Trade Summary

Net Buyer: 121,000 shares ($152,460)

Net Buy 1 txn

Insider Shin Hyunsoo

Role Director

Bought 121,000 shs ($152K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	121,000	$1.26	$152K

Holdings After Transaction: Common Stock — 631,704 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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^*

Shin Hyunsoo

(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 II Director

3. Date of Earliest Transaction (Month/Day/Year)
08/15/2025

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	08/15/2025		P		121,000	A	$1.26	631,704	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:

	/s/ Edmond Cheng, attorney-in-fact	08/19/2025
	** 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 insider transaction did GCTS report on this Form 4?

The Form 4 reports that Director Shin Hyunsoo purchased 121,000 shares of GCTS common stock on 08/15/2025 at $1.26 per share.

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

The filing states the reporting person beneficially owns 631,704 shares following the reported purchase.

Who filed and signed the Form 4 for GCTS insider activity?

The Form 4 was executed by attorney-in-fact Edmond Cheng, with the signature dated 08/19/2025.

Was the transaction a purchase or sale and what code is used on the Form 4?

The transaction is a purchase, indicated by transaction code "P" on the Form 4.

Does the Form 4 report any derivative transactions or amendments?

No. The filing contains only a non-derivative purchase and shows no derivatives or amendments in the reported sections.