Bristol-Myers Squibb (BMY) SC 13G/A Jounce Therapeutics / BRISTOL MYERS SQUIBB ownership change

Exhibit 99.1

Joint Filing Agreement

The persons below hereby agree that the Schedule 13G to which this agreement is attached as an exhibit, as well as all future amendments to such Schedule 13G, shall be filed jointly on behalf of each of them. This agreement is intended to satisfy the requirements of Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934. The undersigned also agree that all subsequent amendments to this statement on Schedule 13G may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements.

EXECUTED this fifth day of April, 2021.

BRISTOL-MYERS SQUIBB COMPANY
By:	/s/ Katherine R. Kelly
	Name:	Katherine R. Kelly
	Title:	Corporate Secretary

CELGENE SWITZERLAND LLC
By:	/s/ Kevin Mello
	Name:	Kevin Mello
	Title:	Manager