Surgalign (SRGAQ) SC 13G RTI Surgical Holdings, Inc.

Exhibit 99.1

Joint Filing Agreement

The undersigned hereby agree as follows:

(i)   Each of them is individually eligible to use the Schedule 13G to which this Exhibit is attached, and such Schedule 13G is filed on behalf of each of them; and

(ii)  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.

Date: March 18, 2019
	HAYFIN CAPITAL HOLDINGS LIMITED
	By:	/s/ Mark Tognolini
	Name:	Mark Tognolini
	Title	Director
	HAYFIN MANAGEMENT HOLDINGS LIMITED
	By:	/s/ Lorna Carroll
	Name:	Lorna Carroll
	Title:	Director
	HAYFIN SOF II GP LIMITED
	By:	/s/ Lorna Carroll
	Name:	Lorna Carroll
	Title:	Director
	HAYFIN SOF II GP LP
	By: Hayfin SOF II GP Limited, its general partner
	By:	/s/ Lorna Carroll
	Name:	Lorna Carroll

HAYFIN SPECIAL OPPORTUNITIES FUND II (AIV I) LP
By: Hayfin SOF II GP LP, its general partner
By: Hayfin SOF II GP Limited, its general partner
By:	/s/ Lorna Carroll
Name:	Lorna Carroll
Title:	Director
HAYFIN MANAGEMENT LIMITED
By:	/s/ Evert Brunekreef
Name:	Evert Brunekreef
Title:	Director

HAYFIN OPAL HOLDINGS LIMITED
By:	/s/ Lorna Carroll
Name:	Lorna Carroll
Title:	Director
HAYFIN OPAL LUXCO 3 SARL
By:	/s/ John Malloy
Name:	John Malloy
Title:	Director
HAYFIN SPECIAL OPPORTUNITIES FUND II (AIV IB) LP
By: Hayfin SOF II GP LP, its general partner
By: Hayfin SOF II GP Limited, its general partner
By:	/s/ Lorna Carroll
Name:	Lorna Carroll
Title:	Director

HAYFIN SOF II USD CO-INVEST LP
By: Hayfin SOF II GP Limited, its general partner
By:	/s/ Lorna Carroll
Name:	Lorna Carroll
Title:	Director
HAYFIN TOPAZ GP LIMITED
By:	/s/ Lorna Carroll
Name:	Lorna Carroll
Title:	Director

HAYFIN TOPAZ LP
By: Hayfin Topaz GP, its general partner
By:	/s/ Lorna Carroll
Name:	Lorna Carroll
Title:	Director
HAYFIN TOPAZ LUXCO 3 SCA
By:	/s/ John Malloy
Name:	John Malloy
Title:	Director