GCT Semiconductor (GCTS) Form 4 — Director Increases Stake by 44,067 Shares

Rhea-AI Filing Summary

Insider purchase by director. GCT Semiconductor Holding director Shin Hyunsoo purchased 44,067 shares of common stock on 09/12/2025 at $1.51 per share, increasing his direct holdings to 694,321 shares. The filing reports only a non-derivative acquisition and lists no derivative transactions. The Form 4 was signed by an attorney-in-fact on behalf of the reporting person.

Positive

• Director purchase: Shin Hyunsoo acquired 44,067 shares, signaling personal investment in the company.
• Increased direct ownership: Holdings rose to 694,321 shares following the transaction.

Negative

• None.

Insights

Corporate Governance Expert

Director purchase signals alignment with shareholders but appears routine and not clearly material.

The reported purchase by a Class II director shows personal capital commitment to the company. As a single non-derivative acquisition, it increases the director's direct stake to 694,321 shares. The filing does not disclose any derivative activity or a change in control. Without transaction context (size relative to outstanding shares or prior trading pattern) this is a governance-positive signal but not necessarily material.

Securities Analyst

Insider buy is a modest positive indicator but lacks materiality evidence in this filing.

The Form 4 documents a purchase of 44,067 shares at $1.51 each. The report is limited to this single non-derivative transaction and the resulting beneficial ownership. There are no option exercises, dispositions, or additional filings to suggest a larger strategic shift. Impact on valuation or liquidity cannot be assessed from this form alone.

Insider Trade Summary

Net Buyer: 44,067 shares

Net Buy 1 txn

Insider Shin Hyunsoo

Role Director

Bought 44,067 shs ($67K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	44,067	$1.51	$67K

Holdings After Transaction: Common Stock — 694,321 shares (Direct)

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

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 09/16/2025 - 04:16 PM Learn about SEC filing dates

FAQ

What did GCTS director Shin Hyunsoo report on Form 4?

The filing reports a non-derivative purchase of 44,067 common shares on 09/12/2025 at a price of $1.51 per share, resulting in 694,321 shares beneficially owned.

Did the Form 4 disclose any derivative transactions for GCTS?

No. The filing lists only a non-derivative acquisition and contains no derivative securities reported.

Who filed the Form 4 for GCTS and how was it signed?

The Form 4 lists reporting person Shin Hyunsoo (Class II Director) and was signed on his behalf by Edmond Cheng, attorney-in-fact on 09/16/2025.

What was the transaction date and price reported on the GCTS Form 4?

The transaction date was 09/12/2025 and the reported purchase price was $1.51 per share.

How many shares does Shin Hyunsoo own after the transaction?

Following the reported purchase, Shin Hyunsoo beneficially owns 694,321 shares directly.

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)
09/12/2025

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	09/12/2025		P		44,067	A	$1.51	694,321	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	09/16/2025
	** 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.