Concord Acquisition Corp II (CNDA) SC 13G/A Concord Acquisition Corp II / Magnetar Financial ownership change

Exhibit 99.1

JOINT FILING AGREEMENT

The undersigned hereby agree that the statement on Schedule 13G with respect to the Shares of Concord Acquisition Corp II dated as of December 31, 2022 is, and any amendments thereto (including amendments on Schedule 13D) signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the previsions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

Date: February 2, 2023	magnetar financial llc
	By: Magnetar Capital Partners LP, its Sole Member
	By: Supernova Management LLC, its General Partner
	By:	/s/ Hayley A. Stein
	Name: Hayley A. Stein
	Title:   Attorney-in-fact for David J. Snyderman, Manager of Supernova Management LLC
Date: February 2, 2023	magnetar capital partners LP
	By: Supernova Management LLC, its General Partner
	By:	/s/ Hayley A. Stein
	Name: Hayley A. Stein
	Title:   Attorney-in-fact for David J. Snyderman, Manager of Supernova Management LLC
Date: February 2, 2023	supernova management llc
	By:	/s/ Hayley A. Stein
	Name: Hayley A. Stein
	Title:   Attorney-in-fact for David J. Snyderman, Manager
Date: February 2, 2023	DAVID J. SNYDERMAN
	By:	/s/ Hayley A. Stein
	Name: Hayley A. Stein
	Title:   Attorney-in-fact for David J. Snyderman