Churchill Capital Corp VI (CCVI) SC 13G Churchill Capital Corp VI / Blackstone Holdings I ownership change

Exhibit 99.1

JOINT FILING AGREEMENT

Pursuant to and in accordance with the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder (the “Exchange Act”) the undersigned hereby agree to the joint filing of Blackstone Aqua Master Sub-Fund, a sub-fund of Blackstone Global Master Fund ICAV, Blackstone Alternative Solutions L.L.C., Blackstone Holdings I L.P., Blackstone Holdings I/II GP L.L.C., The Blackstone Group Inc., Blackstone Group Management L.L.C. and Stephen A. Schwarzman, on behalf of each of them of any filing required by such party under Section 13 or Section 16 of the Exchange Act or any rule or regulation thereunder (including any amendment, restatement, supplement, and/or exhibit thereto) with respect to securities of Churchill Capital Corp VI, and further agree to the filing, furnishing, and/or incorporation by reference of this Agreement as an exhibit thereto. This Agreement shall remain in full force and effect until revoked by any party hereto in a signed writing provided to each other party hereto, and then only with respect to such revoking party. This Agreement may be executed in any number of counterparts all of which taken together shall constitute one and the same instrument.

IN WITNESS WHEREOF, the undersigned hereby execute this Agreement this 1st day of March 2021.

BLACKSTONE GLOBAL MASTER FUND ICAV Acting solely on behalf of its sub-fund BLACKSTONE AQUA MASTER SUB-FUND By: Blackstone Alternative Solutions L.L.C., its investment manager
By:	/s/ Peter Koffler
	Name: Peter Koffler
	Title: Authorized Person
BLACKSTONE ALTERNATIVE SOLUTIONS L.L.C.
By:	/s/ Peter Koffler
	Name: Peter Koffler
	Title: Authorized Person
BLACKSTONE HOLDINGS I L.P.
By: Blackstone Holdings I/II GP L.L.C., its general partner
By: The Blackstone Group Inc., its sole member
By:	/s/ Tabea Hsi
	Name: Tabea Hsi Title: Senior Managing Director

BLACKSTONE HOLDINGS I/II GP L.L.C.
By: The Blackstone Group Inc., its sole member
By:	/s/ Tabea Hsi
	Name: Tabea Hsi
	Title: Senior Managing Director
THE BLACKSTONE GROUP INC.
By:	/s/ Tabea Hsi
	Name: Tabea Hsi
	Title: Senior Managing Director
BLACKSTONE GROUP MANAGEMENT L.L.C.
By:	/s/ Tabea Hsi
	Name: Tabea Hsi
	Title: Senior Managing Director
/s/ Stephen A. Schwarzman
Stephen A. Schwarzman