GCT Semiconductor grants Alex Sum 75,000 RSUs

Senior vice president receives a 75,000-RSU equity award in GCT Semiconductor Holding, Inc., vesting over four years.

Rhea-AI Filing Summary

GCT Semiconductor Holding, Inc. (symbol: GCTS) is the issuer of record for a Form 4 filing submitted to the SEC. Sum Alex reported acquisition or exercise transactions in this Form 4 filing.

GCT Semiconductor Holding, Inc. (GCTS) reported that Sr. VP of Sales and Marketing Alex Sum received a grant of 75,000 restricted stock units (RSUs) on September 10, 2026. Each RSU represents a contingent right to receive one share of common stock and vests in four equal 25% installments on each anniversary of the grant date, starting September 10, 2026, subject to continued service. Following this award, Sum holds 258,743 shares of common stock directly.

Insider Trade Summary

Grant/Award: 75,000 shares

Grant/Award 1 txn

Insider Sum Alex

Role Sr. VP of Sales and Marketing

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.0001 per share F1	75,000	$0.00	$0.00

Holdings After Transaction: Common Stock, par value $0.0001 per share — 258,743 shares (Direct)

Footnotes (1)

1. F1. 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 10, 2026 grant date, commencing September 10, 2026, subject to the Reporting Person's continued service with the Issuer.

Key Figures

RSUs granted: 75,000 units Shares owned after transaction: 258,743 shares Vesting schedule: 25% per year over 4 years +1 more

4 metrics

RSUs granted 75,000 units Restricted stock units granted to Alex Sum on September 10, 2026

Shares owned after transaction 258,743 shares Direct ownership of GCT Semiconductor Holding, Inc. common stock after award

Vesting schedule 25% per year over 4 years RSUs vest annually on each anniversary of the September 10, 2026 grant date

Par value per share $0.0001 per share Par value of GCT Semiconductor Holding, Inc. common stock underlying the RSUs

Key Terms

restricted stock units, contingent right, vest, grant date

4 terms

restricted stock units financial

"Represents restricted stock units ("RSU"), which constitute a contingent right"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

contingent right financial

"which constitute a contingent right to receive one share of common stock"

vest financial

"The RSUs vest over four years in equal 25% installments"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

grant date financial

"on each anniversary of the September 10, 2026 grant date"

The grant date is the day a company formally gives an employee or contractor the right to receive stock-based compensation, such as stock options or restricted shares. It matters to investors because it fixes key terms—like the price, the start of the ownership clock, and when the award will affect the company’s financial statements and share count—so it can influence dilution, reported expenses, and potential future selling pressure.

FAQ

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

What insider transaction did GCTS report for Alex Sum on September 10, 2026?

GCT Semiconductor Holding, Inc. reported that Alex Sum received a grant of 75,000 RSUs on September 10, 2026, as an equity award. The RSUs represent a contingent right to receive common stock, not a cash purchase in the market.

How do the 75,000 RSUs granted to Alex Sum at GCTS vest?

The 75,000 RSUs granted to Alex Sum vest over four years in equal 25% installments on each anniversary of the September 10, 2026 grant date, beginning September 10, 2026, subject to his continued service with GCT Semiconductor Holding, Inc.

What is Alex Sum’s share ownership in GCTS after this RSU grant?

After the RSU grant, Alex Sum is reported to hold 258,743 shares of GCT Semiconductor Holding, Inc. common stock directly. This figure reflects his ownership following the reported award transaction.

Was the GCTS RSU grant to Alex Sum made under a Rule 10b5-1 trading plan?

No. The filing indicates the Rule 10b5-1 checkbox is not affirmatively marked, and the footnote for this transaction does not state that it was made pursuant to a Rule 10b5-1 or similar trading plan.

What does each RSU granted to Alex Sum by GCTS represent?

Each RSU represents a contingent right to receive one share of GCT Semiconductor Holding, Inc. common stock, par value $0.0001 per share, subject to the vesting schedule and his continued service with the company.

Is there a per-share purchase price for Alex Sum’s GCTS RSU grant?

No cash purchase is involved. The Form 4 describes the transaction as a grant or award of RSUs with a reported price of $0.0000 per share, indicating a compensation award rather than a market purchase.

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

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Available on EDGAR 09/14/2026 - 04:37 PM Accepted by SEC EDGAR 09/14/2026 - 04:32 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^*

Sum Alex

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/10/2026

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, par value $0.0001 per share	09/10/2026		A(1)		75,000	A	$0	258,743	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 10, 2026 grant date, commencing September 10, 2026, subject to the Reporting Person's continued service with the Issuer.

	/s/ Edmond Cheng, attorney-in-fact	09/14/2026
	** 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)