North Sound Trading SC 13G IsoPlexis / North Sound Trading ownership change

EXHIBIT 99.1

JOINT FILING AGREEMENT
PURSUANT TO RULE 13d-1(k)

The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

Dated: December 23, 2021

NORTH SOUND TRADING, LP
By: North Sound Management, Inc., its
general partner
By:	/s/ Brian Miller
	Name:	Brian Miller
	Title:	President
NORTH SOUND VENTURES, LP
By: North Sound Management, Inc., its
general partner
By:	/s/ Brian Miller
	Name:	Brian Miller
	Title:	President
NORTH SOUND MANAGEMENT, INC.
By:	/s/ Brian Miller
	Name:	Brian Miller
	Title:	President
/s/ Brian Miller
Brian Miller