Shin Hyunsoo

SEC source: 0000929638-26-003832 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 827,039

F1 · shares: Represents Restricted Stock Units ("RSUs") acquired pursuant to the terms of the GCT Semiconductor Holding, Inc. (the "Issuer") GCT 2024 Omnibus Incentive Compensation Plan. Each RSU represents the right to receive one share of common stock, par value $0.0001 per share ("Common Stock") of the Issuer following vesting.

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: 0000929638-26-002491 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 814,068

F1 · shares: Represents Restricted Stock Units ("RSUs") acquired pursuant to the terms of the GCT Semiconductor Holding, Inc. (the "Issuer") GCT 2024 Omnibus Incentive Compensation Plan. Each RSU represents the right to receive one share of common stock, par value $0.0001 per share ("Common Stock") of the Issuer following vesting.

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: 0000929638-26-001356 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 804,809

F1 · shares: Represents Restricted Stock Units ("RSUs") acquired pursuant to the terms of the GCT Semiconductor Holding, Inc. (the "Issuer") GCT 2024 Omnibus Incentive Compensation Plan. Each RSU represents the right to receive one share of common stock, par value $0.0001 per share ("Common Stock") of the Issuer following vesting.

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: 0000929638-26-000016 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 780,687

F1 · shares: Represents Restricted Stock Units ("RSUs") acquired pursuant to the terms of the GCT Semiconductor Holding, Inc. (the "Issuer") GCT 2024 Omnibus Incentive Compensation Plan. Each RSU represents the right to receive one share of common stock, par value $0.0001 per share ("Common Stock") of the Issuer following vesting.

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 RSU's 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: 0000929638-25-004392 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 757,771

SEC source: 0000929638-25-004362 · form4.xml · nonDerivative · entry 2

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 741,046

SEC source: 0000929638-25-004362 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 737,866

SEC source: 0000929638-25-003732 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 712,413

F1 · shares: Represents Restricted Stock Units ("RSUs") acquired pursuant to the terms of the GCT Semiconductor Holding, Inc. (the "Issuer") GCT 2024 Omnibus Incentive Compensation Plan. Each RSU represents the right to receive one share of common stock, par value $0.0001 per share ("Common Stock") of the Issuer following vesting.

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 RSU's 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: 0000929638-25-003492 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 694,321

SEC source: 0000929638-25-003408 · form4.xml · nonDerivative · entry 2

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 650,254

SEC source: 0000929638-25-003408 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 639,954

SEC source: 0000929638-25-003096 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 631,704

SEC source: 0000929638-25-002497 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 510,704

F1 · shares: Represents Restricted Stock Units ("RSUs") acquired pursuant to the terms of the GCT Semiconductor Holding, Inc. (the "Issuer") GCT 2024 Omnibus Incentive Compensation Plan. Each RSU represents the right to receive one share of common stock, par value $0.0001 per share ("Common Stock") of the Issuer following vesting.

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 RSU's 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: 0000929638-25-002224 · form4.xml · nonDerivative · entry 2

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 492,248

SEC source: 0000929638-25-002224 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 447,248

SEC source: 0000929638-25-002184 · form4.xml · nonDerivative · entry 3

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 407,248

SEC source: 0000929638-25-002184 · form4.xml · nonDerivative · entry 2

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 385,948

SEC source: 0000929638-25-002184 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 327,248

SEC source: 0000929638-25-002006 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 247,248

SEC source: 0000929638-25-001984 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 170,248

SEC source: 0000929638-25-001449 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 84,248

F1 · shares: Represents Restricted Stock Units ("RSUs") acquired pursuant to the terms of the GCT Semiconductor Holding, Inc. (the "Issuer") GCT 2024 Omnibus Incentive Compensation Plan. Each RSU represents the right to receive one share of common stock, par value $0.0001 per share ("Common Stock") of the Issuer following vesting.

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 RSU's 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: 0000929638-25-000010 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 67,693

F1 · shares: Represents Restricted Stock Units ("RSUs") acquired pursuant to the terms of the GCT Semiconductor Holding, Inc. (the "Issuer") GCT 2024 Omnibus Incentive Compensation Plan. Each RSU represents the right to receive one share of common stock, par value $0.0001 per share ("Common Stock") of the Issuer following vesting.

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 RSU's 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: 0000929638-24-004247 · form4.xml · nonDerivative · entry 3

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,891

SEC source: 0000929638-24-004247 · form4.xml · nonDerivative · entry 2

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,891

SEC source: 0000929638-24-004247 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,691

SEC source: 0000929638-24-004023 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,891

F1 · shares: Represents Restricted Stock Units ("RSUs") acquired pursuant to the terms of the GCT Semiconductor Holding, Inc. (the "Issuer") GCT 2024 Omnibus Incentive Compensation Plan. Each RSU represents the right to receive one share of common stock, par value $0.0001 per share ("Common Stock") of the Issuer following vesting.

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 RSU's 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: 0000929638-24-002415 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,683

F1 · shares: Represents Restricted Stock Units ("RSUs") acquired pursuant to the terms of the GCT Semiconductor Holding, Inc. (the "Issuer") GCT 2024 Omnibus Incentive Compensation Plan. Each RSU represents the right to receive one share of common stock, par value $0.0001 per share ("Common Stock") of the Issuer following vesting.

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 RSU's 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: 0000929638-24-001257 · form4.xml · derivative · entry 3

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,536

Underlying: Common Stock · 6,536 shares

Expires 2032-01-11

F3 · kind: Pursuant to the Business Combination Agreement, at the Effective Time, each outstanding option to purchase shares of GCT common stock was assumed and converted into an option to purchase shares of common stock of the Issuer with the same terms and conditions as were applicable to such option immediately prior to the Effective Time, subject to the applicable exchange ratio.

F4 · derivative.exercise_date: The option vests with respect to (i) twenty-five percent (25%) of the shares upon completion of one (1) year of service measured from January 11, 2022 and (ii) the balance of the shares subject to the option in a series of thirty-six (36) successive equal monthly installments upon completion of each additional month of service over the thirty-six (36) month period measured from January 11, 2023.

SEC source: 0000929638-24-001257 · form4.xml · nonDerivative · entry 2

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,735

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: 0000929638-24-001257 · form4.xml · nonDerivative · entry 1

Shin Hyunsoo · CIK 0002007757 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 456

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.