Exhibit 99.1

JOINT FILING AGREEMENT

The undersigned agree that this Schedule 13D, and any amendments hereto, relating to the shares of common stock, par value $0.0001 per share, of Xynomic Pharmaceuticals Holdings, Inc. shall be filed on behalf of the undersigned.

Date:  June 6, 2019
	Bison Capital Holding Company Limited
	By:	/s/ Peixin Xu
	Name:	Peixin Xu
	Title:	Director
	By:	/s/ Peixin Xu
	Name:	Peixin Xu
	By:	/s/ Fengyun Jiang
	Name:	Fengyun Jiang