Exhibit 99.1

JOINT FILING AGREEMENT

The undersigned hereby agree that they are filing this statement jointly pursuant to Rule 13d-1(k)(1). Each of them is responsible for the timely filing of such Schedule 13G and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate.

In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each other on behalf of each of them of such a statement on Schedule 13G with respect to the Class A Common Stock of FTS International, Inc. beneficially owned by each of them. This Joint Filing Agreement shall be included as an exhibit to such Schedule 13G.

IN WITNESS WHEREOF, the undersigned hereby execute this Joint Filing Agreement as of February 14, 2021.

	Ares XXVII CLO Ltd.
	By:	Ares CLO Management XXVII, L.P., as Asset Manager
	By:	Ares CLO GP XXVII, LLC, its General Partner

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XXVIIIR CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XXIX CLO Ltd.
	By:	Ares CLO Management XXIX, L.P., as Asset Manager
	By:	Ares CLO GP XXIX, LLC, its General Partner

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XXXIR CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XXXIIR CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XXXIV CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XXXVR CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XXXVII CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XXXVIII CLO Ltd.
	By:	Ares CLO Management II LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XXXIX CLO Ltd.
	By:	Ares CLO Management II LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XL CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XLI CLO Ltd.
	By:	Ares CLO Management II LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XLII CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XLIII CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XLIV CLO Ltd.
	By:	Ares CLO Management II LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XLV CLO Ltd.
	By:	Ares CLO Management II LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XLVI CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XLVII CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XLVIII CLO Ltd.
	By:	Ares CLO Management II LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares XLIX CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares L CLO Ltd.
	By:	Ares CLO Management LLC, as Asset Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares Credit Strategies Insurance Dedicated Fund Series Interests of the SALI Multi-Series Fund, L.P.
	By:	Ares Management LLC, its Investment Subadvisor

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Future Fund Board of Guardians
	By:	Ares Enhanced Investment Strategy Advisor IV, L.P., its Investment Manager
	By:	Ares Enhanced Loan Investment Strategy Advisor IV GP, LLC, its General Partner

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Transatlantic Reinsurance Company
	By:	Ares ASIP VII Management, L.P., its Portfolio Manager
	By:	Ares ASIP VII GP, LLC, its General Partner

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	RSUI Indemnity Company
	By:	Ares ASIP VII Management, L.P., its Portfolio Manager
	By:	Ares ASIP VII GP, LLC, its General Partner

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	CION Ares Diversified Credit Fund
	By:	Ares Capital Management II LLC, its Investment Adviser

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares Credit Hedge Fund LP
	By:	Ares Capital Management III LLC, its Investment Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares Enhanced Credit Opportunities Master Fund II, Ltd.
	By:	Ares Enhanced Credit Opportunities Investment Management II, LLC, its Investment Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Lucent Technologies Inc. Master Pension Trust
	By:	Alcatel-Lucent Investment Managed Corporation, its Named Fiduciary
	By:	Ares Management LLC, its Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares Institutional High Yield Master Fund LP
	By:	Ares Management LLC, its Investment Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares Institutional Credit Fund, LP
	By:	Ares Management LLC, its Investment Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Future Fund Board of Guardians for Medical Research Future Fund
	By:	Ares Enhanced Loan Investment Strategy Advisor IV, L.P., its Investment Manager
	By:	Ares Enhanced Loan Investment Strategy Advisor IV, GP, LLC, its General Partner

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	SEI Global Master Fund PLC
	By:	Ares Management LLC, its Portfolio Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	SEI Investments Canada Company – U.S. High Yield Bond Fund
	By:	Ares Management LLC, its Portfolio Manager

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	SEI Institutional Investments Trust - High Yield Bond Fund
	By:	Ares Management LLC, its Sub-Adviser

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	SEI Institutional Managed Trust
	By:	Ares Management LLC, its Sub-Adviser

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Touchstone Funds Group Trust – Touchstone Credit Opportunities II Fund
	By:	Ares Capital Management II LLC, its Sub-Adviser

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares Management LLC
	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares Management Holdings L.P.
	By:	Ares Holdco LLC
	Its:	General Partner

	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares Holdco LLC
	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares Management Corporation
	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares Management GP LLC
	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares Voting LLC
	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

	Ares Partners Holdco LLC
	Signed:	/s/ Naseem Sagati Aghili
	Name:	Naseem Sagati Aghili
	Title:	Authorized Signatory

FTS International, Inc. SC 13G/A