[SCHEDULE 13G/A] GCT Semiconductor Holding, Inc. SEC Filing

Rhea-AI Filing Summary

SUNP Corporation filed an amendment to Schedule 13G reporting ownership of 2,910,870 shares of GCT Semiconductor Holding, Inc. Common Stock, representing 5.2% of the outstanding class based on 55,859,904 shares. The filing shows SUNP has sole voting and dispositive power over 2,605,109 shares and shared voting and dispositive power over 305,761 shares. The shares are directly held by several SUNP subsidiaries, with SUNP retaining voting/dispositive authority as disclosed. The filing includes a certification that the stake was not acquired to influence control.

Positive

• Transparent disclosure of a 5.2% ownership stake meeting SEC reporting requirements
• Clear breakdown of sole versus shared voting and dispositive power (2,605,109 sole; 305,761 shared)
• Identification of subsidiaries that directly hold the shares, clarifying the ownership chain
• Certification that the shares were not acquired to influence control, consistent with Schedule 13G filing standards

Negative

• None.

Insights

Financial Analyst

TL;DR: SUNP holds a disclosed 5.2% stake with majority sole voting control over its shares, a notable but non-controlling position.

The 5.2% stake meets SEC reporting thresholds and signals SUNP's meaningful minority interest in GCTS without implying control. The split between sole and shared voting/dispositive power clarifies where SUNP exercises direct authority versus where it shares influence with other holders. For investors, this establishes a clear ownership baseline and identifies SUNP as a visible institutional holder; no financial results or transactions altering capital structure are disclosed in this filing.

Corporate Governance Expert

TL;DR: Filing documents governance rights: SUNP reports sole authority over most shares and certifies no intent to change control.

The Schedule 13G/A properly documents the identity of the reporting person, the subsidiaries holding the shares, and precise voting/dispositive splits. The written certification that the position is not for control purposes is standard for a passive investor filing under Schedule 13G. The information improves transparency about shareholder composition but does not indicate any governance action or solicitation.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

GCT Semiconductor Holding, Inc.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

36170N107

(CUSIP Number)

06/30/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 36170N107

1

Names of Reporting Persons

SUNP Corp

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

KOREA, REPUBLIC OF

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,605,109.00
6	Shared Voting Power 305,761.00
7	Sole Dispositive Power 2,605,109.00
8	Shared Dispositive Power 305,761.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,910,870.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.2 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: 1. The percentage ownership was calculated based upon 55,859,904 shares of the Issuer's common stock, par value $0.0001 per share ("Common Stock") outstanding as of August 7, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q (the "Form 10-Q") filed with the Securities and Exchange Commission (the "SEC") on August 12, 2025. 2. The shares of the Issuer's Common Stock are directly held by M-Venture Investment, Inc., M-Material.Parts.Equipment Platform Investment 1, L.P., Asia Pacific Venture Invest L.P., and Asia Pacific Venture Invest II L.P., which are wholly-owned subsidiaries of the Reporting Person, which has sole power to vote and/or dispose of the Common Stock. 3. The shares of the Issuer's Common Stock are directly held by Global Growth Investment, L.P., which the Reporting Person has shared power to vote and/or dispose of the Common Stock beneficially owned by Global Growth Investment, L.P.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: GCT Semiconductor Holding, Inc.
(b)	Address of issuer's principal executive offices: 2290 NORTH 1ST STREET, SUITE 201, SAN JOSE, California, 95131
Item 2.
(a)	Name of person filing: See response to 2(c)
(b)	Address or principal business office or, if none, residence: See response to 2(c)
(c)	Citizenship: This statement is filed on behalf of: SUNP Corporation 6F, Cheongpung Building, 14, Teheran-ro 82-gil, Gangnam-gu, Seoul, 06178, Republic of Korea
(d)	Title of class of securities: Common Stock, par value $0.0001 per share
(e)	CUSIP No.: 36170N107
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
	Corporation.
Item 4.	Ownership
(a)	Amount beneficially owned: 2,910,870 shares
(b)	Percent of class: 5.2%. The percentage ownership was calculated based upon 55,859,904 shares of the Issuer's common stock outstanding as of August 7, 2025, as reported in the Issuer's Form 10-Q filed with the SEC on August 12, 2025.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 2,605,109 shares
	(ii) Shared power to vote or to direct the vote: 305,761 shares
	(iii) Sole power to dispose or to direct the disposition of: 2,605,109 shares
	(iv) Shared power to dispose or to direct the disposition of: 305,761 shares
Item 5.	Ownership of 5 Percent or Less of a Class.
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit A.
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

SUNP Corp

Signature:	/s/ Jay (JaeHyuk) Hyun
Name/Title:	Jay (JaeHyuk) Hyun, Chief Financial Officer
Date:	08/22/2025

FAQ

How many GCTS shares does SUNP Corporation report owning?

SUNP reports beneficial ownership of 2,910,870 shares of GCT Semiconductor (GCTS).

What percentage of GCT Semiconductor (GCTS) does SUNP own?

The filing states SUNP owns 5.2% of GCTS common stock, based on 55,859,904 outstanding shares.

How many shares does SUNP have sole voting power over in GCTS?

SUNP has sole voting power over 2,605,109 shares and shared voting power over 305,761 shares.

Was SUNP's stake acquired to influence control of GCT Semiconductor (GCTS)?

No. The filing includes a certification stating the securities were not acquired to change or influence control of the issuer.

When was the Schedule 13G/A signed for SUNP's filing?

The Schedule 13G/A is signed by Jay (JaeHyuk) Hyun, CFO of SUNP Corp, dated 08/22/2025.