Exhibit 99.1

JOINT FILING AGREEMENT

The undersigned hereby agree that the foregoing statement on Schedule 13D is filed on behalf of each of the undersigned in accordance with the provisions of Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, and that all subsequent amendments to this statement on Schedule 13D may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. Nothing herein shall be deemed to be an admission that the parties hereto, or any of them, are members of a “group” (within the meaning of Section 13(d) of the Act and the rules promulgated thereunder) with respect to any securities of Rimini Street, Inc.

Date: September 14, 2021

GPIAC, LLC

	By:	/s/ Antonio Bonchristiano
	Name:	Antonio Bonchristiano
	Title:	Officer

	By:	/s/ Rodrigo Boscolo
	Name:	Rodrigo Boscolo
	Title:	Officer

RMNI InvestCo, LLC

	By:	/s/ Antonio Bonchristiano
	Name:	Antonio Bonchristiano
	Title:	Officer

	By:	/s/ Rodrigo Boscolo
	Name:	Rodrigo Boscolo
	Title:	Officer

GP Cash Management Ltd.

	By:	/s/ Antonio Bonchristiano
	Name:	Antonio Bonchristiano
	Title:	Officer

	By:	/s/ Rodrigo Boscolo
	Name:	Rodrigo Boscolo
	Title:	Officer

GP Investments, Ltd.

	By:	/s/ Antonio Bonchristiano
	Name:	Antonio Bonchristiano
	Title:	Chief Executive Officer

	By:	/s/ Rodrigo Boscolo
	Name:	Rodrigo Boscolo
	Title:	Chief Financial Officer

GPIC, Ltd.

	By:	/s/ Antonio Bonchristiano
	Name:	Antonio Bonchristiano
	Title:	Director

	By:	/s/ Rodrigo Boscolo
	Name:	Rodrigo Boscolo
	Title:	Director

RIMINI STREET, INC. SC 13D/A