SW

SEC source: 0001104659-25-091927 · tm2526572-14_4seq1.xml · derivative · entry 2

Mayer Saverio · CIK 0002028256 · See remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 80,431

Underlying: Ordinary Shares · 776 shares

Expires not disclosed

F1 · derivative.exercise_price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F3 · derivative.exercise_date: The 80,431 restricted stock units vest and are settled as follows:(i) 44,048 restricted stock units in February 2026, (ii) and 36,383 restricted stock units in February 2027.

F3 · derivative.expiration_date: The 80,431 restricted stock units vest and are settled as follows:(i) 44,048 restricted stock units in February 2026, (ii) and 36,383 restricted stock units in February 2027.

SEC source: 0001104659-25-091927 · tm2526572-14_4seq1.xml · nonDerivative · entry 1

Mayer Saverio · CIK 0002028256 · See remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 189,560

F1 · price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 16,098 restricted stock units which are scheduled to vest in three equal annual installments beginning on March 11, 2026, the first anniversary of the grant date.

SEC source: 0001104659-25-091934 · tm2526572-10_4seq1.xml · derivative · entry 2

Bowles Ken · CIK 0002026939 · Director · Executive VP and Group CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,369

Underlying: Ordinary Shares · 882 shares

Expires not disclosed

F1 · derivative.exercise_price: In accordance with the terms of outstanding restricted stock unit awards, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F3 · derivative.exercise_date: The 91,369 restricted stock units vest and are settled as follows:(i) 50,039 restricted stock units in February 2026, (ii) and 41,330 restricted stock units in February 2027.

F3 · derivative.expiration_date: The 91,369 restricted stock units vest and are settled as follows:(i) 50,039 restricted stock units in February 2026, (ii) and 41,330 restricted stock units in February 2027.

SEC source: 0001104659-25-091934 · tm2526572-10_4seq1.xml · nonDerivative · entry 1

Bowles Ken · CIK 0002026939 · Director · Executive VP and Group CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 130,482

F1 · price: In accordance with the terms of outstanding restricted stock unit awards, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 19,024 restricted stock units which are scheduled to vest in three equal annual installments beginning on March 11, 2026, the first anniversary of the grant date.

SEC source: 0001104659-25-091938 · tm2526572-19_4seq1.xml · nonDerivative · entry 1

FergusonMchugh MaryLynn · CIK 0001613133 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,131

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,323 restricted stock units which will vest on the earlier of (i) May 2, 2026, or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001104659-25-091932 · tm2526572-16_4seq1.xml · nonDerivative · entry 1

Hietala Kaisa · CIK 0001868531 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,602

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,323 restricted stock units which will vest on the earlier of (i) May 2, 2026, or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001104659-25-091930 · tm2526572-7_4seq1.xml · nonDerivative · entry 1

Finan Irial · CIK 0001299112 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,025

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 6,794 restricted stock units which will vest on the earlier of (i) May 2, 2026, or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001104659-25-091929 · tm2526572-15_4seq1.xml · nonDerivative · entry 1

BERNLOHR TIMOTHY J · CIK 0001286593 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,106

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,323 restricted stock units which will vest on the earlier of (i) May 2, 2026, or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001104659-25-091928 · tm2526572d6_4seq1.xml · nonDerivative · entry 1

Brown Carole Lynnette · CIK 0001820224 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,323

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,323 restricted stock units which will vest on the earlier of (i) May 2, 2026, or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001104659-25-091925 · tm2526572-13_4seq1.xml · nonDerivative · entry 1

Harrison Suzan F. · CIK 0001706044 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,541

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,323 restricted stock units which will vest on the earlier of (i) May 2, 2026, or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001104659-25-091923 · tm2526572-3_4seq1.xml · nonDerivative · entry 1

Arnold Colleen F. · CIK 0001409123 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,883.444

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,323 restricted stock units which are scheduled to vest on the earlier of (i) May 2, 2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders and 26,671.444 fully vested restricted stock units that will be settled in ordinary shares following the Reporting Person's cessation of service as a member of the Issuer's board of directors in accordance with the terms of the WestRock Company 2016 Deferred Compensation Plan for Non-Employee Directors.

SEC source: 0001104659-25-091921 · tm2526572-2_4seq1.xml · nonDerivative · entry 1

WILSON ALAN D · CIK 0001216704 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,472.977

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,323 restricted stock units which are scheduled to vest on the earlier of (i) May 2, 2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders and 56,422.977 fully vested restricted stock units that will be settled in ordinary shares following the Reporting Person's cessation of service as a member of the Issuer's board of directors in accordance with the terms of the WestRock Company 2016 Deferred Compensation Plan for Non-Employee Directors.

SEC source: 0001062993-25-012019 · form4.xml · nonDerivative · entry 1

CREWS TERRELL K · CIK 0001126219 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,343

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,282 restricted stock units which will vest on the earlier of (i) May 2, 2026, or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001062993-25-012033 · form4.xml · derivative · entry 2

SMURFIT ANTHONY P J · CIK 0001133264 · Director · President and Group CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 179,706

Underlying: Ordinary Shares · 1,807 shares

Expires not disclosed

F1 · derivative.exercise_price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F3 · derivative.exercise_date: The 179,706 restricted stock units vest and are settled as follows:(i) 98,417 restricted stock units in February 2026, (ii) and 81,289 restricted stock units in February 2027.

F3 · derivative.expiration_date: The 179,706 restricted stock units vest and are settled as follows:(i) 98,417 restricted stock units in February 2026, (ii) and 81,289 restricted stock units in February 2027.

SEC source: 0001062993-25-012033 · form4.xml · nonDerivative · entry 1

SMURFIT ANTHONY P J · CIK 0001133264 · Director · President and Group CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,569,767

F1 · price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 65,222 restricted stock units which are scheduled to vest in three equal annual installments beginning on March 11, 2026, the first anniversary of the grant date.

SEC source: 0001062993-25-012021 · form4.xml · derivative · entry 2

Henao Alvaro · CIK 0002053658 · see remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,492

Underlying: Ordinary Shares · 366 shares

Expires not disclosed

F1 · derivative.exercise_price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F3 · derivative.exercise_date: The 36,492 restricted stock units vest and are settled as follows:(i) 17,834 restricted stock units in February 2026, (ii) and 18,658 restricted stock units in February 2027.

F3 · derivative.expiration_date: The 36,492 restricted stock units vest and are settled as follows:(i) 17,834 restricted stock units in February 2026, (ii) and 18,658 restricted stock units in February 2027.

SEC source: 0001062993-25-012021 · form4.xml · nonDerivative · entry 1

Henao Alvaro · CIK 0002053658 · see remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,144

F1 · price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,783 restricted stock units which are scheduled to vest in three equal annual installments beginning on March 11, 2026, the first anniversary of the grant date.

SEC source: 0001062993-25-012024 · form4.xml · derivative · entry 2

Page Irene · CIK 0002029262 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,062

Underlying: Ordinary Shares · 301 shares

Expires not disclosed

F1 · derivative.exercise_price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F3 · derivative.exercise_date: The 30,062 restricted stock units vest and are settled as follows:(i) 16,463 restricted stock units in February 2026, (ii) and 13,599 restricted stock units in February 2027.

F3 · derivative.expiration_date: The 30,062 restricted stock units vest and are settled as follows:(i) 16,463 restricted stock units in February 2026, (ii) and 13,599 restricted stock units in February 2027.

SEC source: 0001062993-25-012024 · form4.xml · nonDerivative · entry 1

Page Irene · CIK 0002029262 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,367

F1 · price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 3,130 restricted stock units which are scheduled to vest in three equal annual installments beginning on March 11, 2026, the first anniversary of the grant date.

SEC source: 0001062993-25-012035 · form4.xml · nonDerivative · entry 1

Fairweather Carol · CIK 0002029261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,090

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,282 restricted stock units which are scheduled to vest on the earlier of (i) May 2,2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001062993-25-012029 · form4.xml · nonDerivative · entry 1

Garren Ben · CIK 0002030058 · see remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,536

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 7,536 restricted stock units which are scheduled to vest in three equal annual installments beginning on March 11, 2026, the first anniversary of the grant date.

SEC source: 0001062993-25-012028 · form4.xml · derivative · entry 3

Sellier Laurent · CIK 0002029274 · see remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 67,092

Underlying: Ordinary Shares · 674 shares

Expires not disclosed

F1 · derivative.exercise_price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F3 · derivative.exercise_date: The 67,092 restricted stock units vest and are settled as follows: (i) 37,107restricted stock units in February 2026, (ii) and 29,985 restricted stock units in February 2027.

F3 · derivative.expiration_date: The 67,092 restricted stock units vest and are settled as follows: (i) 37,107restricted stock units in February 2026, (ii) and 29,985 restricted stock units in February 2027.

SEC source: 0001062993-25-012028 · form4.xml · nonDerivative · entry 1

Sellier Laurent · CIK 0002029274 · see remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 98,741

F1 · price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 18,841 restricted stock units which are scheduled to vest in three equal annual installments beginning on March 11, 2026, the first anniversary of the grant date.

SEC source: 0001062993-25-012037 · form4.xml · nonDerivative · entry 1

Rasmussen Jorgen Buhl · CIK 0002029266 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,236

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,282 restricted stock units which are scheduled to vest on the earlier of (i) May 2,2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001062993-25-012038 · form4.xml · nonDerivative · entry 1

Melgar Lourdes · CIK 0002029405 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,090

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: The 4,282 restricted stock units are scheduled to vest on the earlier of (i) May 2,2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001062993-25-012025 · form4.xml · derivative · entry 2

Mayer Saverio · CIK 0002028256 · see remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,655

Underlying: Ordinary Shares · 800 shares

Expires not disclosed

F1 · derivative.exercise_price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F3 · derivative.exercise_date: The 79,655 restricted stock units vest and are settled as follows:(i) 43,623 restricted stock units in February 2026, (ii) and 36,032 restricted stock units in February 2027.

F3 · derivative.expiration_date: The 79,655 restricted stock units vest and are settled as follows:(i) 43,623 restricted stock units in February 2026, (ii) and 36,032 restricted stock units in February 2027.

SEC source: 0001062993-25-012025 · form4.xml · nonDerivative · entry 1

Mayer Saverio · CIK 0002028256 · see remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 189,405

F1 · price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 15,943 restricted stock units which are scheduled to vest in three equal annual installments beginning on March 11, 2026, the first anniversary of the grant date.

SEC source: 0001062993-25-012022 · form4.xml · derivative · entry 2

Bowles Ken · CIK 0002026939 · Director · Executive VP and Group CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,487

Underlying: Ordinary Shares · 909 shares

Expires not disclosed

F1 · derivative.exercise_price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F3 · derivative.exercise_date: The 90,487 restricted stock units vest and are settled as follows:(i) 49,556 restricted stock units in February 2026, (ii) and 40,931 restricted stock units in February 2027.

F3 · derivative.expiration_date: The 90,487 restricted stock units vest and are settled as follows:(i) 49,556 restricted stock units in February 2026, (ii) and 40,931 restricted stock units in February 2027.

SEC source: 0001062993-25-012022 · form4.xml · nonDerivative · entry 1

Bowles Ken · CIK 0002026939 · Director · Executive VP and Group CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 130,299

F1 · price: In accordance with the terms of the applicable outstanding restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 18,841 restricted stock units which are scheduled to vest in three equal annual installments beginning on March 11, 2026, the first anniversary of the grant date.

SEC source: 0001062993-25-012039 · form4.xml · nonDerivative · entry 1

FergusonMchugh MaryLynn · CIK 0001613133 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,090

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: The 4,282 restricted stock units are scheduled to vest on the earlier of (i) May 2,2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001062993-25-012036 · form4.xml · nonDerivative · entry 1

Hietala Kaisa · CIK 0001868531 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,561

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,282 restricted stock units which are scheduled to vest on the earlier of (i) May 2,2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001062993-25-012031 · form4.xml · nonDerivative · entry 1

Arnold Colleen F. · CIK 0001409123 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,585.844

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,282 restricted stock units which are scheduled to vest on the earlier of (i) May 2,2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders and 26,414.844 fully vested restricted stock units that will be settled in ordinary shares following the Reporting Person's cessation of service as a member of the Issuer's board of directors in accordance with the terms of the WestRock Company 2016 Deferred Compensation Plan for Non-Employee Directors.

SEC source: 0001062993-25-012027 · form4.xml · nonDerivative · entry 1

BERNLOHR TIMOTHY J · CIK 0001286593 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,065

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,282 restricted stock units which will vest on the earlier of (i) May 2, 2026, or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001062993-25-012030 · form4.xml · nonDerivative · entry 1

Finan Irial · CIK 0001299112 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 54,960

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 6,729 restricted stock units which will vest on the earlier of (i) May 2, 2026, or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001062993-25-012020 · form4.xml · nonDerivative · entry 1

Harrison Suzan F. · CIK 0001706044 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,500

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,282 restricted stock units which are scheduled to vest on the earlier of (i) May 2,2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001062993-25-012018 · form4.xml · nonDerivative · entry 1

Brown Carole Lynnette · CIK 0001820224 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,282

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,282 restricted stock units which are scheduled to vest on the earlier of (i) May 2,2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001062993-25-012017 · form4.xml · nonDerivative · entry 1

WILSON ALAN D · CIK 0001216704 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 61,886.986

F1 · price: In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share.

F2 · balance_after: Includes 4,282 restricted stock units which are scheduled to vest on the earlier of (i) May 2,2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders and 55,877.986 fully vested restricted stock units that will be settled in ordinary shares following the Reporting Person's cessation of service as a member of the Issuer's board of directors in accordance with the terms of the WestRock Company 2016 Deferred Compensation Plan for Non-Employee Directors.

SEC source: 0001062993-25-008832 · form4.xml · nonDerivative · entry 1

Finan Irial · CIK 0001299112 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 54,893

SEC source: 0001104659-25-044973 · tm2514162-6_4seq1.xml · nonDerivative · entry 2

CREWS TERRELL K · CIK 0001126219 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,300

F2 · shares: Reflects ordinary shares of Smurfit Westrock plc withheld to satisfy the Reporting Person's tax withholding obligation upon vesting and settlement of RSUs.

SEC source: 0001104659-25-044973 · tm2514162-6_4seq1.xml · nonDerivative · entry 1

CREWS TERRELL K · CIK 0001126219 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,940

F1 · shares: On May 2nd, 2025, the Reporting Person was granted 4,239 restricted stock units (RSUs). Each RSU represents a contingent right to receive one ordinary share. The RSUs are scheduled to vest on the earlier of (i) the first anniversary of the date of grant of the RSU or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001104659-25-044978 · tm2514162-9_4seq1.xml · nonDerivative · entry 2

Rasmussen Jorgen Buhl · CIK 0002029266 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,193

F2 · shares: Reflects ordinary shares of Smurfit Westrock plc withheld to satisfy the Reporting Person's tax withholding obligation upon vesting and settlement of RSUs.

SEC source: 0001104659-25-044978 · tm2514162-9_4seq1.xml · nonDerivative · entry 1

Rasmussen Jorgen Buhl · CIK 0002029266 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,833

F1 · shares: On May 2nd, 2025, the Reporting Person was granted 4,239 restricted stock units (RSUs). Each RSU represents a contingent right to receive one ordinary share. The RSUs are scheduled to vest on the earlier of (i) the first anniversary of the date of grant of the RSU or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001104659-25-044981 · tm2514162-11_4seq1.xml · nonDerivative · entry 2

Fairweather Carol · CIK 0002029261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,047

F2 · shares: Reflects ordinary shares of Smurfit Westrock plc withheld to satisfy the Reporting Person's tax withholding obligation upon vesting and settlement of RSUs.

SEC source: 0001104659-25-044981 · tm2514162-11_4seq1.xml · nonDerivative · entry 1

Fairweather Carol · CIK 0002029261 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,687

F1 · shares: On May 2nd, 2025, the Reporting Person was granted 4,239 restricted stock units (RSUs). Each RSU represents a contingent right to receive one ordinary share. The RSUs are scheduled to vest on the earlier of (i) the first anniversary of the date of grant of the RSU or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001104659-25-044970 · tm2514162-3_4seq1.xml · nonDerivative · entry 2

Melgar Lourdes · CIK 0002029405 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,047

F2 · shares: Reflects ordinary shares of Smurfit Westrock plc withheld to satisfy the Reporting Person's tax withholding obligation upon vesting and settlement of RSUs.

SEC source: 0001104659-25-044970 · tm2514162-3_4seq1.xml · nonDerivative · entry 1

Melgar Lourdes · CIK 0002029405 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,687

F1 · shares: On May 2nd, 2025, the Reporting Person was granted 4,239 restricted stock units (RSUs). Each RSU represents a contingent right to receive one ordinary share. The RSUs are scheduled to vest on the earlier of (i) the first anniversary of the date of grant of the RSU or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001104659-25-044984 · tm2514162-13_4seq1.xml · nonDerivative · entry 2

Arnold Colleen F. · CIK 0001409123 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,277.097

F2 · shares: Reflects ordinary shares of Smurfit Westrock plc withheld to satisfy the Reporting Person's tax withholding obligation upon vesting and settlement of RSUs.

F3 · balance_after: Includes 28,038.097 fully vested RSUs that will be settled in ordinary shares following the Reporting Person's cessation of service as a member of Smurfit Westrock plc's board of directors in accordance with the terms of the WestRock Company 2016 Deferred Compensation Plan for Non-Employee Directors.

SEC source: 0001104659-25-044984 · tm2514162-13_4seq1.xml · nonDerivative · entry 1

Arnold Colleen F. · CIK 0001409123 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,917.097

F1 · shares: On May 2nd, 2025, the Reporting Person was granted 4,239 restricted shares units (RSUs). Each RSU represents a contingent right to receive one ordinary share. The RSUs are scheduled to vest on the earlier of (i) the first anniversary of the date of grant of the RSU or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

F3 · balance_after: Includes 28,038.097 fully vested RSUs that will be settled in ordinary shares following the Reporting Person's cessation of service as a member of Smurfit Westrock plc's board of directors in accordance with the terms of the WestRock Company 2016 Deferred Compensation Plan for Non-Employee Directors.

SEC source: 0001104659-25-044982 · tm2514162-12_4seq1.xml · nonDerivative · entry 1

Brown Carole Lynnette · CIK 0001820224 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,239

F1 · shares: On May 2nd, 2025, the Reporting Person was granted 4,239 restricted stock units (RSUs). Each RSU represents a contingent right to receive one ordinary share. The RSUs are scheduled to vest on the earlier of (i) the first anniversary of the date of grant of the RSU or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders.

SEC source: 0001104659-25-044979 · tm2514162-10_4seq1.xml · nonDerivative · entry 2

WILSON ALAN D · CIK 0001216704 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 61,281.824

F2 · shares: Reflects ordinary shares of Smurfit Westrock plc withheld to satisfy the Reporting Person's tax withholding obligation upon vesting and settlement of RSUs.

F3 · balance_after: Includes 57,042.824 fully vested RSUs that will be settled in ordinary shares following the Reporting Person's cessation of service as a member of Smurfit Westrock plc's board of directors in accordance with the terms of the WestRock Company 2016 Deferred Compensation Plan for Non-Employee Directors.