Exhibit 1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, each of the undersigned hereby agrees to the joint filing on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the Common Shares of Glatfelter Corporation, and that this Joint Filing Agreement be included as an Exhibit to such joint filing.

Each of the undersigned acknowledges that each shall be responsible for the timely filing of any statement (including amendments) on Schedule 13D, and for the completeness and accuracy of the information concerning him or it contained herein, but shall not be responsible for the completeness and accuracy of the information concerning the other persons making such filings, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

Dated: October 17, 2022

DOUBLE BLACK DIAMOND OFFSHORE LTD.
By: Carlson Capital, L.P., its investment manager
By: Asgard Investment Corp. II, its general partner
By:	/s/ Clint D. Carlson
Name:	Clint D. Carlson
Title:	President
BLACK DIAMOND ARBITRAGE OFFSHORE LTD.
By: Carlson Capital, L.P., its investment manager
By: Asgard Investment Corp. II, its general partner
By:	/s/ Clint D. Carlson
Name:	Clint D. Carlson
Title:	President

DELAWARE DOMICILED SINGLE INVESTOR LIMITED PARTNERSHIP - 101
By: Carlson Capital, L.P., its investment manager
By: Asgard Investment Corp. II, its general partner
By:	/s/ Clint D. Carlson
Name:	Clint D. Carlson
Title:	President
CARLSON CAPITAL, L.P.
By: Asgard Investment Corp. II, its general partner
By:	/s/ Clint D. Carlson
Name:	Clint D. Carlson
Title:	President
ASGARD INVESTMENT CORP. II
By:	/s/ Clint D. Carlson
Name:	Clint D. Carlson
Title:	President
CLINT D. CARLSON
/s/ Clint D. Carlson