Lee Thomas H SC 13D Independent Bank Group, Inc.

Exhibit A

JOINT FILING AGREEMENT

This will confirm the agreement by and among all the undersigned that the Schedule 13D filed on or about this date and any amendments thereto with respect to the beneficial ownership by the undersigned of the Common Stock, $0.01 par value per share, of Independent Bank Group, Inc. is being filed on behalf of each of the undersigned in accordance with Rule 13d-1(k)(1).  This agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

Dated:  April 11, 2017
	LEP CARLILE HOLDINGS, LLC
	By:	/s/ Joseph B. Rotberg	4/11/2017
	Name: Joseph B. Rotberg		Date
	Title: Chief Financial Officer
	LEE EQUITY PARTNERS REALIZATION FUND, L.P.
	By: Lee Equity Partners Realization Fund GP, LLC, its general partner
	By:	/s/ Joseph B. Rotberg	4/11/2017
	Name: Joseph B. Rotberg		Date
	Title: Chief Financial Officer
	LEE EQUITY STRATEGIC PARTNERS REALIZATION FUND, L.P.
	By: Lee Equity Partners Realization Fund GP, LLC, its general partner
	By:	/s/ Joseph B. Rotberg	4/11/2017
	Name: Joseph B. Rotberg		Date
	Title: Chief Financial Officer
	THOMAS H. LEE
	By:	/s/ Joseph B. Rotberg	4/11/2017
	Attorney-in-Fact		Date
	LEP CARLILE CO-INVESTOR GROUP I, LLC
	By:	/s/ Joseph B. Rotberg	4/11/2017
	Name: Joseph B. Rotberg		Date
	Title: Chief Financial Officer