JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)(1)

Exhibit 99.3

JOINT FILING AGREEMENT

PURSUANT TO RULE 13d-1(k)(1)

THIS JOINT FILING AGREEMENT is entered into as of June 23, 2023, by and among the parties hereto. The undersigned hereby agree that the Statement on Schedule 13D with respect to the shares of Common Stock, par value $1.00 of Sylvamo Corporation and any amendment thereafter signed by each of the undersigned shall be (unless otherwise determined by the undersigned) filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. This Joint Filing Agreement may be executed in any number of counterparts, each of which shall be deemed an original, but all of which shall constitute one and the same instrument.

Dated: June 23, 2023				ACR Group Paper Holdings JR LP
						By: ACR Group Paper Holdings JR GP LLC, its general partner
				By:		/s/ Xxxxxxx X. Xxxxx
				Name:		Xxxxxxx X. Xxxxx
				Title:		President
Dated: June 23, 2023				ACR Group Paper Holdings JR GP LLC
				By:		/s/ Xxxxxxx X. Xxxxx
				Name:		Xxxxxxx X. Xxxxx
				Title:		President
Dated: June 23, 2023				ACR Group Paper Holdings LP
						By: Atlas Capital XX XX LP, its general partner
						By: Atlas Capital Resources XX XX LLC, its general partner
				By:		/s/ Xxxxxxx X. Xxxxx
				Name:		Xxxxxxx X. Xxxxx
				Title:		Managing Partner
Dated: June 23, 2023				Atlas Capital XX XX LP
						By: Atlas Capital Resources XX XX LLC, its general partner
				By:		/s/ Xxxxxxx X. Xxxxx
				Name:		Xxxxxxx X. Xxxxx
				Title:		Managing Partner

Dated: June 23, 2023				Atlas Capital Resources XX XX LLC
				By:		/s/ Xxxxxxx X. Xxxxx
				Name:		Xxxxxxx X. Xxxxx
				Title:		Managing Partner
Dated: June 23, 2023				/s/ Xxxxxx X. Xxxxxx
				Xxxxxx X. Xxxxxx
Dated: June 23, 2023				/s/ Xxxxxxx X. Xxxxx
				Xxxxxxx X. Xxxxx
Dated: June 23, 2023				Lapetus Capital III LLC
				By:		/s/ Xxxxxxx X. Xxxxx
				Name:		Xxxxxxx X. Xxxxx
				Title:		Vice President
Dated: June 23, 2023				Atlas Capital Resources III LP
						By: Atlas Capital GP III LP, its general partner
						By: Atlas Capital Resources GP III LLC, its general partner
				By:		/s/ Xxxxxxx X. Xxxxx
				Name:		Xxxxxxx X. Xxxxx
				Title:		Managing Partner
Dated: June 23, 2023				Atlas Capital GP III LP
						By: Atlas Capital Resources GP III LLC, its general partner
				By:		/s/ Xxxxxxx X. Xxxxx
				Name:		Xxxxxxx X. Xxxxx
				Title:		Managing Partner
Dated: June 23, 2023				Atlas Capital Resources GP III LLC
				By:		/s/ Xxxxxxx X. Xxxxx
				Name:		Xxxxxxx X. Xxxxx
				Title:		Managing Partner

SCHEDULE I

Lapetus Capital III LLC

Name and Position of Officer or Director		Principal Business Address		Principal Occupation or Employment		Citizenship
Xxxxxx X. Xxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		President and Chief Executive Officer		United States
Xxxxxxx X. Xxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxx Xxxxxxxxx		Xxxxxx Xxxxxx
Xxxxxx X. Xxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Chief Financial Officer, Treasurer and Secretary		United States
Xxxxx Xxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Assistant Treasurer and Assistant Secretary		United States

Atlas Capital Resources GP III LLC

Name and Position of Officer or Director		Principal Business Address		Principal Occupation or Employment		Citizenship
Xxxxxx X. Xxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxxx Xxxxxxx		Xxxxxx Xxxxxx
Xxxxxxx X. Xxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxxx Xxxxxxx		Xxxxxx Xxxxxx
Xxxxx X. Xxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Managing Partner		United States
Xxx X. Xxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx
Xxxxx X. Xxxxxxxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx
Xxxxxx X. Xxxxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx
Xxxxxx X. Xxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx
Xxxxxx X. Xxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx
Xxxxxxx X. Xxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx
Xxxxx X. Xxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx

ACR Group Paper Holdings JR GP LLC

Name and Position of Officer or Director		Principal Business Address		Principal Occupation or Employment		Citizenship
Xxxxxxx X. Xxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Manager and President		United States
Xxxxxx Xxxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Manager and Vice President		United States
Xxxxxx Xxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Manager and Vice President		United States
Xxxxx Xxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Treasurer and Secretary		United States
Xxxxxxx X. Xxxxxx		00 Xxxxx Xxxxxxx Xxxx, Xxxxx 000 Xxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx

Atlas Capital Resources XX XX LLC

Name and Position of Officer or Director		Principal Business Address		Principal Occupation or Employment		Citizenship
Xxxxxx X. Xxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxxx Xxxxxxx		Xxxxxx Xxxxxx
Xxxxxxx X. Xxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxxx Xxxxxxx		Xxxxxx Xxxxxx
Xxxxx X. Xxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Managing Partner		United States
Xxx X. Xxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx
Xxxxx X. Xxxxxxxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx
Xxxxxx X. Xxxxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx
Xxxxxx X. Xxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx
Xxxxxx X. Xxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx
Xxxxxxx X. Xxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx
Xxxxx X. Xxxxxx		000 Xxxxxxxxxx Xxxxxx Xxxxxxxxx, XX 00000		Xxxxxxx		Xxxxxx Xxxxxx