Laurent Sellier) - 18 Sep 2025 Form 4 Insider Report for Smurfit Westrock plc (SW)

Role: President and Chief Executive Officer, North America (including Mexico). Exhibit 24.1 Power of Attorney.
Signature: /s/ Ciara O'Riordan, attorney-in-fact for Laurent Sellier
Issuer symbol: SW
Transactions as of: 18 Sep 2025
Net transactions value: $0
Form type: 4
Filing time: 22 Sep 2025, 09:26:21 UTC
Previous filing: 23 Jun 2025
Next filing: 19 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Sellier Laurent	President and Chief Executive Officer, North America (including Mexico). Exhibit 24.1 Power of Attorney.	BEECH HILL, CLONSKEAGH, DUBLIN 4, IRELAND	/s/ Ciara O'Riordan, attorney-in-fact for Laurent Sellier	22 Sep 2025	0002029274

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SW	Ordinary Shares	Award	$0	+183	+0.19%	$0.000000	98,924	18 Sep 2025	Direct	F1, F2
holding	SW	Ordinary Shares						3,188	18 Sep 2025	Shares owned by spouse

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	SW	Restricted Stock Units (PSP)	Award	$0	+653	+0.97%	$0.000000	67,745	18 Sep 2025	Ordinary Shares	653		Direct	F1, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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	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.
F3	The 67,745 restricted stock units vest and are settled as follows:(i) 37,468 restricted stock units in February 2026, (ii) and 30,277 restricted stock units in February 2027.

Remarks:

President and Chief Executive Officer, North America (including Mexico). Exhibit 24.1 Power of Attorney.