GCTS

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: 0000929638-25-002494 · form4.xml · nonDerivative · entry 1

Chan Nelson · CIK 0001242653 · Director · Class I Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,512

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 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: 0000929638-25-002493 · form4.xml · nonDerivative · entry 1

Barker Robert · CIK 0002007837 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 77,321

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: 0000929638-25-002224 · 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: 0000929638-25-001450 · form4.xml · nonDerivative · entry 1

Barker Robert · CIK 0002007837 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,865

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.

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: 0000929638-25-001448 · form4.xml · nonDerivative · entry 1

Chun Kukjin · CIK 0002007838 · Director · Class I Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,791

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: 0000929638-25-001447 · 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: 0000929638-25-001446 · form4.xml · nonDerivative · entry 1

TUDER JEFFREY · CIK 0001671976 · Director · Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,056

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.

SEC source: 0000929638-25-001445 · form4.xml · nonDerivative · entry 1

Chan Nelson · CIK 0001242653 · Director · Class I Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,056

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: 0001104659-25-029344 · tm2510715-3_4seq1.xml · derivative · entry 2

Concord Sponsor Group III LLC · CIK 0001891676 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,948,086 shares

Expires not disclosed

F1 · kind: Pro rata distribution from the Reporting Person to its members.

F3 · price: The securities are held directly by the Reporting Person. The Reporting Person is governed by a board of managers consisting of three managers, Bob Diamond, David Schamis and Tim Kacani. Any action by the Reporting Person with respect to the issuer or the issuer's securities held by the Reporting Person, including voting and dispositive decisions, requires at least a majority vote of the managers of the board of managers. Under the so-called "rule of three", because voting and dispositive decisions are made by a majority of the managers, none of the managers is deemed to be a beneficial owner of issuer's securities held by the Reporting Person, even those in which such manager holds a pecuniary interest. Accordingly, none of the managers on the Reporting Person's board of managers is deemed to have or share beneficial ownership of the founder shares held by the Reporting Person.

F4 · derivative.exercise_date: These warrants became exercisable 30 days after the closing of the business combination (the "Closing"), on March 26, 2024, by and among the Issuer, Gibraltar Merger Sub Inc., a Delaware corporation, and GCT Semiconductors, Inc., a Delaware corporation, pursuant to a business combination agreement entered into on November 2, 2023, and will expire five years after the Closing.

F4 · derivative.expiration_date: These warrants became exercisable 30 days after the closing of the business combination (the "Closing"), on March 26, 2024, by and among the Issuer, Gibraltar Merger Sub Inc., a Delaware corporation, and GCT Semiconductors, Inc., a Delaware corporation, pursuant to a business combination agreement entered into on November 2, 2023, and will expire five years after the Closing.

F2 · ownership.direct: Includes 532,190 shares of common stock that are subject to forfeiture on March 26, 2029 if the volume weighted average price of the Issuer's common stock does not trade above certain specified prices for any 20 trading day period within a period of 30 consecutive trading days prior to such date.

SEC source: 0001104659-25-029344 · tm2510715-3_4seq1.xml · nonDerivative · entry 1

Concord Sponsor Group III LLC · CIK 0001891676 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 632,586

F1 · kind: Pro rata distribution from the Reporting Person to its members.

F1 · price: Pro rata distribution from the Reporting Person to its members.

F2 · balance_after: Includes 532,190 shares of common stock that are subject to forfeiture on March 26, 2029 if the volume weighted average price of the Issuer's common stock does not trade above certain specified prices for any 20 trading day period within a period of 30 consecutive trading days prior to such date.

F3 · ownership.direct: The securities are held directly by the Reporting Person. The Reporting Person is governed by a board of managers consisting of three managers, Bob Diamond, David Schamis and Tim Kacani. Any action by the Reporting Person with respect to the issuer or the issuer's securities held by the Reporting Person, including voting and dispositive decisions, requires at least a majority vote of the managers of the board of managers. Under the so-called "rule of three", because voting and dispositive decisions are made by a majority of the managers, none of the managers is deemed to be a beneficial owner of issuer's securities held by the Reporting Person, even those in which such manager holds a pecuniary interest. Accordingly, none of the managers on the Reporting Person's board of managers is deemed to have or share beneficial ownership of the founder shares held by the Reporting Person.

SEC source: 0000929638-25-001612 · form4.xml · derivative · entry 2

TUDER JEFFREY · CIK 0001671976 · Director · Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20,734 shares

Expires not disclosed

F1 · kind: Reflects a distribution from Concord Sponsor Group III LLC to Tremson Capital Management, LLC of which the Reporting Person has sole voting and dispositive power over the shares he holds directly.

F2 · derivative.exercise_date: The private placement warrants are currently exercisable and will expire five years from March 26, 2024, as described in the Issuer's registration statement on Form S-4 (File No. 333-275522), as amended.

F2 · derivative.expiration_date: The private placement warrants are currently exercisable and will expire five years from March 26, 2024, as described in the Issuer's registration statement on Form S-4 (File No. 333-275522), as amended.

F2 · ownership.direct: The private placement warrants are currently exercisable and will expire five years from March 26, 2024, as described in the Issuer's registration statement on Form S-4 (File No. 333-275522), as amended.

SEC source: 0000929638-25-001612 · form4.xml · nonDerivative · entry 1

TUDER JEFFREY · CIK 0001671976 · Director · Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,345

F1 · kind: Reflects a distribution from Concord Sponsor Group III LLC to Tremson Capital Management, LLC of which the Reporting Person has sole voting and dispositive power over the shares he holds directly.

F1 · price: Reflects a distribution from Concord Sponsor Group III LLC to Tremson Capital Management, LLC of which the Reporting Person has sole voting and dispositive power over the shares he holds directly.

SEC source: 0000929638-25-000839 · form4.xml · derivative · entry 2

Sum Alex · CIK 0001543349 · Sr. VP of Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 13,259 shares

Expires 2025-02-23

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: Options fully vested.

SEC source: 0000929638-25-000839 · form4.xml · nonDerivative · entry 1

Sum Alex · CIK 0001543349 · Sr. VP of Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 108,743

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: A portion of these shares represent restricted stock units.

SEC source: 0000929638-25-000841 · form4.xml · derivative · entry 2

Schlaefer John · CIK 0001542775 · Director · President, CEO & Class III Dir

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 35,669 shares

Expires 2025-02-23

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: Options fully vested.

SEC source: 0000929638-25-000841 · form4.xml · nonDerivative · entry 1

Schlaefer John · CIK 0001542775 · Director · President, CEO & Class III Dir

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 127,173

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: A portion of these shares represent restricted stock units.

SEC source: 0000929638-25-000012 · form4.xml · nonDerivative · entry 1

TUDER JEFFREY · CIK 0001671976 · Director · Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,288

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: 0000929638-25-000010 · 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: 0000929638-25-000008 · 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: 0000929638-25-000006 · form4.xml · nonDerivative · entry 1

Chun Kukjin · CIK 0002007838 · Director · Class I Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,964

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: 0000929638-25-000004 · form4.xml · nonDerivative · entry 1

CHAN NELSON C · CIK 0001242653 · Director · Class I Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,288

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: 0000929638-25-000002 · form4.xml · nonDerivative · entry 1

Barker Robert · CIK 0002007837 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,162

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: 0000929638-24-004247 · 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: 0000929638-24-004024 · form4.xml · nonDerivative · entry 1

TUDER JEFFREY · CIK 0001671976 · Director · Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,486

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: 0000929638-24-004023 · 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: 0000929638-24-004022 · 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: 0000929638-24-004021 · form4.xml · nonDerivative · entry 1

Chun Kukjin · CIK 0002007838 · Director · Class I Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,162

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: 0000929638-24-004020 · form4.xml · nonDerivative · entry 1

CHAN NELSON C · CIK 0001242653 · Director · Class I Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,486

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: 0000929638-24-004019 · form4.xml · nonDerivative · entry 1

Barker Robert · CIK 0002007837 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,360

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: 0000929638-24-003344 · form4.xml · derivative · entry 2

Anapass, Inc. · CIK 0002007839 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 148,320

Underlying: Common Stock · 148,320 shares

Expires not disclosed

F2 · kind: Pursuant to the Agreement, the Issuer issued to the Reporting Person a warrant, which entitles the Reporting Person to purchase 148,320 shares of Common Stock for $3.02 per share (the "Warrant").

F3 · derivative.exercise_date: The Warrant is currently exercisable and will expire five years from September 26, 2024.

F3 · derivative.expiration_date: The Warrant is currently exercisable and will expire five years from September 26, 2024.

SEC source: 0000929638-24-003344 · form4.xml · nonDerivative · entry 1

Anapass, Inc. · CIK 0002007839 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,017,466

F1 · kind: Pursuant to a Securities Purchase Agreement (the "Agreement"), dated as of September 26, 2024 by and between GCT Semiconductor Holding, Inc. (the "Issuer") and Anapass, Inc. (the "Reporting Person"), the Reporting Person acquired in a private placement transaction 741,603 shares of common stock, $0.0001 par value (the "Common Stock") of the Issuer.

SEC source: 0000929638-24-002963 · form4.xml · nonDerivative · entry 1

Cheng Edmond · CIK 0001491155 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 76,000

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.

F2 · shares: The shares subject to RSUs reported herein will vest in equal annual installments over a four (4) year period measured from March 18, 2024.

F3 · 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: 0000929638-24-002414 · 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: 0000929638-24-002413 · form4.xml · nonDerivative · entry 1

Chun Kukjin · CIK 0002007838 · Director · Class I Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,954

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: 0000929638-24-002412 · form4.xml · nonDerivative · entry 1

CHAN NELSON C · CIK 0001242653 · Director · Class I Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,278

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: 0000929638-24-002411 · form4.xml · nonDerivative · entry 1

Barker Robert · CIK 0002007837 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,152

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: 0000929638-24-002418 · form4.xml · nonDerivative · entry 1

TUDER JEFFREY · CIK 0001671976 · Director · Class III Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,278

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: 0000929638-24-001261 · form4.xml · nonDerivative · entry 1

Anapass, Inc. · CIK 0002007839 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,275,863

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: 0000929638-24-001260 · form4.xml · derivative · entry 4

Barker Robert · CIK 0002007837 · Director · Class II Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,867

Underlying: Common Stock · 1,867 shares

Expires 2030-01-01

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.

F5 · 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 1, 2020 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 1, 2021.