Lee Kyeongho

SEC source: 0000929638-26-003842 · form4.xml · nonDerivative · entry 1

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,109,093

F1 · shares: 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.

F2 · shares: 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.

F3 · shares: The RSUs will vest on March 31, 2027, subject to continued service through such date.

F4 · shares: No expiration date is applicable to restricted stock units.

SEC source: 0000929638-26-002492 · form4.xml · nonDerivative · entry 1

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,096,122

F1 · shares: 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.

F2 · shares: 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 $2.97 on June 30, 2026, rounded down to the nearest whole share.

F3 · shares: The RSUs will vest on March 31, 2027, subject to continued service through such date.

F4 · shares: No expiration date is applicable to restricted stock units.

SEC source: 0000929638-26-001360 · form4.xml · nonDerivative · entry 1

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,086,863

F1 · shares: 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.

F2 · shares: 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, 2025 through March 31, 2026 (beginning with the quarter ending June 30, 2025) by dividing $27,500 by the fair market value per share of Common Stock, which was determined to be $1.14 on March 31, 2026, rounded down to the nearest whole share.

F3 · shares: The RSUs will vest on March 31, 2026, subject to continued service through such date.

F4 · shares: No expiration date is applicable to restricted stock units.

SEC source: 0000929638-26-000017 · form4.xml · nonDerivative · entry 1

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,062,741

F1 · shares: 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.

F2 · shares: 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, 2025 through March 31, 2026 (beginning with the quarter ending June 30, 2025) by dividing $27,500 by the fair market value per share of Common Stock, which was determined to be $1.20 on December 31, 2025, rounded down to the nearest whole share.

F3 · shares: The RSUs will vest on March 31, 2026, subject to continued service through such date.

F4 · shares: No expiration date is applicable to restricted stock units.

SEC source: 0000929638-25-003731 · form4.xml · nonDerivative · entry 1

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,039,825

F1 · shares: 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.

F2 · shares: 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, 2025 through March 31, 2026 (beginning with the quarter ending June 30, 2025) by dividing $27,500 by the fair market value per share of Common Stock, which was determined to be $1.52 on September 30, 2025, rounded down to the nearest whole share.

F3 · shares: The RSUs will vest on March 31, 2026, subject to continued service through such date.

F4 · shares: No expiration date is applicable to restricted stock units.

SEC source: 0000929638-25-002496 · form4.xml · nonDerivative · entry 1

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,021,733

F1 · shares: 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.

F2 · shares: 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, 2025 through March 31, 2026 (beginning with the quarter ending June 30, 2025) by dividing $27,500 by the fair market value per share of Common Stock, which was determined to be $1.49 on June 30, 2025, rounded down to the nearest whole share.

F3 · shares: The RSUs will vest on March 31, 2026, subject to continued service through such date.

F4 · shares: No expiration date is applicable to restricted stock units.

SEC source: 0000929638-25-001447 · form4.xml · nonDerivative · entry 1

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,003,277

F1 · shares: 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.

F2 · shares: 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, 2024 through March 31, 2025 (beginning with the quarter ending June 30, 2024) by dividing $27,500 by the fair market value per share of Common Stock, which was determined to be $1.64 on March 31, 2025, rounded down to the nearest whole share.

F3 · shares: The RSUs will vest on March 31, 2025 subject to continued service through such date.

F4 · shares: No expiration date is applicable to restricted stock units.

F5 · balance_after: Mr. Lee's previously filed Form 4 included 800,000 private placement warrants, currently held, but not yet exercised, in Mr. Lee's beneficially owned securities, which are now removed in this Form 4.

SEC source: 0000929638-25-000008 · form4.xml · nonDerivative · entry 1

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,697,279

F1 · shares: 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.

F2 · shares: 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, 2024 through March 31, 2025 (beginning with the quarter ending June 30, 2024) by dividing $27,500 by the fair market value per share of Common Stock, which was determined to be $2.33 on December 31, 2024, rounded down to the nearest whole share.

F3 · shares: The RSUs will vest on March 31, 2025 subject to continued service through such date.

F4 · shares: No expiration date is applicable to restricted stock units.

SEC source: 0000929638-24-004022 · form4.xml · nonDerivative · entry 1

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,685,477

F1 · shares: 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.

F2 · shares: 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, 2024 through March 31, 2025 (beginning with the quarter ending June 30, 2024) by dividing $27,500 by the fair market value per share of Common Stock, which was determined to be $3.35 on September 30, 2024, rounded down to the nearest whole share.

F3 · shares: The RSUs will vest on March 31, 2025 subject to continued service through such date.

F4 · shares: No expiration date is applicable to restricted stock units.

SEC source: 0000929638-24-002414 · form4.xml · nonDerivative · entry 1

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,677,269

F1 · shares: 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.

F2 · shares: 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, 2024 through March 31, 2025 (beginning with the quarter ending June 30, 2024) by dividing $27,500 by the fair market value per share of Common Stock, which was determined to be $5.21 on June 28, 2024, rounded down to the nearest whole share.

F3 · shares: The RSUs will vest on March 31, 2025 subject to continued service through such date.

F4 · shares: No expiration date is applicable to restricted stock units.

SEC source: 0000929638-24-001253 · form4.xml · nonDerivative · entry 2

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 93,380

F2 · kind: Represents the Issuer's common stock subject to restricted stock units (RSUs). Pursuant to the Business Combination Agreement, at the Effective Time (as defined in the Business Combination Agreement), each award of restricted stock units relating to a share of GCT common stock granted under GCT's existing equity plans was automatically converted into an award of restricted stock units covering the number of shares of the common stock of the Issuer in the manner set forth in the Business Combination Agreement. The shares subject to RSUs reported herein will vest in equal annual installments over a four (4) year period measured from December 11, 2023.

SEC source: 0000929638-24-001253 · form4.xml · nonDerivative · entry 1

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 867,840

F1 · kind: Pursuant to the Business Combination Agreement, dated as of November 2, 2023 (the "Business Combination Agreement"), by and among Concord Acquisition Corp III, Gibraltar Merger Sub Inc., and GCT Semiconductor, Inc. ("GCT"), at the Effective Time (as defined in the Business Combination Agreement), each share of GCT common stock was automatically converted for the right to receive common stock of the Issuer in the manner set forth in the Business Combination Agreement.

SEC source: 0000929638-24-001691 · form4.xml · derivative · entry 4

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 800,000

Underlying: Common Stock · 800,000 shares

Expires not disclosed

F3 · security: This Form 4/A is being filed to include the amount of Private Placement Warrants (as defined below) beneficially owned by Kyeongho Lee, which was inadvertently omitted in the original Form 4 filed on March 27, 2024.

F4 · kind: Represents 800,000 private placement warrants (the "Private Placement Warrants") received by Kyeongho Lee that were allocated to certain Company Insider Recipients at GCT's discretion to incentivize investment. Each Private Placement Warrant entitles the holder to purchase one share of Common Stock for $11.50 per share, subject to adjustment.

F5 · derivative.exercise_date: The Private Placement Warrants are currently exercisable and will expire five years after the Closing, as described in the Issuer's registration statement on Form S-4 (File No. 333-275522), as amended

F5 · derivative.expiration_date: The Private Placement Warrants are currently exercisable and will expire five years after the Closing, as described in the Issuer's registration statement on Form S-4 (File No. 333-275522), as amended

SEC source: 0000929638-24-001691 · form4.xml · nonDerivative · entry 2

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 93,380

F2 · kind: Represents the Issuer's Common Stock subject to restricted stock units (RSUs). Pursuant to the Business Combination Agreement, at the Effective Time (as defined in the Business Combination Agreement), each award of restricted stock units relating to a share of GCT common stock granted under GCT's existing equity plans was automatically converted into an award of restricted stock units covering the number of shares of the Common Stock of the Issuer in the manner set forth in the Business Combination Agreement. The shares subject to RSUs reported herein will vest in equal annual installments over a four (4) year period measured from December 11, 2023.

SEC source: 0000929638-24-001691 · form4.xml · nonDerivative · entry 1

Lee Kyeongho · CIK 0001542776 · Director · Chairman & Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 867,840

F1 · kind: Pursuant to the Business Combination Agreement, dated as of November 2, 2023 (the "Business Combination Agreement"), by and among Concord Acquisition Corp III, Gibraltar Merger Sub Inc., and GCT Semiconductor, Inc. ("GCT"), at the Effective Time (as defined in the Business Combination Agreement), each share of GCT common stock was automatically converted for the right to receive common stock, $0.0001 par value (the "Common Stock") of the Issuer in the manner set forth in the Business Combination Agreement.