Schlaefer John

SEC source: 0000929638-26-003525 · 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: 352,728

F1 · kind: 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.

SEC source: 0000929638-25-003689 · 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: 202,728

F1 · kind: The transaction is a distribution of 555 shares of Common Stock, for no consideration, by the Parakletos @ Venture Millennium Fund LP. to the Reporting Person.

SEC source: 0000929638-25-003562 · 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: 202,173

F1 · kind: 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 19, 2025 grant date, commencing September 19, 2026, subject to the Reporting Person's continued service with the Issuer.

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: 0000929638-24-001255 · form4.xml · derivative · entry 6

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,425

Underlying: Common Stock · 50,425 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.

F7 · 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.

SEC source: 0000929638-24-001255 · form4.xml · derivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,533

Underlying: Common Stock · 21,533 shares

Expires 2029-01-01

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.

F6 · 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, 2019 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, 2020.

SEC source: 0000929638-24-001255 · form4.xml · derivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,191

Underlying: Common Stock · 28,191 shares

Expires 2028-01-01

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, 2018 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, 2019.

SEC source: 0000929638-24-001255 · form4.xml · derivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,669

Underlying: Common Stock · 35,669 shares

Expires 2025-01-01

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.

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 1, 2015 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, 2016.

SEC source: 0000929638-24-001255 · form4.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,804

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: 0000929638-24-001255 · 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: 78,700

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: 0000929638-25-000894 · form4.xml · derivative · entry 6

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,425

Underlying: Common Stock · 50,425 shares

Expires 2030-06-08

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.

F7 · 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.

F8 · derivative.expiration_date: This amendment is being filed by the Reporting Person solely to amend the Form 4 filed on March 26, 2024 to correct the reported expiration date of stock options following the transactions previously reported on March 26, 2024.

SEC source: 0000929638-25-000894 · form4.xml · derivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,533

Underlying: Common Stock · 21,533 shares

Expires 2029-04-19

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.

F6 · 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, 2019 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, 2020.

F8 · derivative.expiration_date: This amendment is being filed by the Reporting Person solely to amend the Form 4 filed on March 26, 2024 to correct the reported expiration date of stock options following the transactions previously reported on March 26, 2024.

SEC source: 0000929638-25-000894 · form4.xml · derivative · entry 4

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,191

Underlying: Common Stock · 28,191 shares

Expires 2028-03-14

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, 2018 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, 2019.

F8 · derivative.expiration_date: This amendment is being filed by the Reporting Person solely to amend the Form 4 filed on March 26, 2024 to correct the reported expiration date of stock options following the transactions previously reported on March 26, 2024.

SEC source: 0000929638-25-000894 · form4.xml · derivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,669

Underlying: Common Stock · 35,669 shares

Expires 2025-02-23

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 1, 2015 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, 2016.

F8 · derivative.expiration_date: This amendment is being filed by the Reporting Person solely to amend the Form 4 filed on March 26, 2024 to correct the reported expiration date of stock options following the transactions previously reported on March 26, 2024.

SEC source: 0000929638-25-000894 · form4.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,804

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: 0000929638-25-000894 · 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: 78,700

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.