Form of Proxy

MAXCYTE, INC.

Notes

BD Client Code:

Client Name:

Number of Shares Held in a BD Nominee Company:

No.	Proposition		For	Against	Abstain
1	DIRECTOR Patrick J. Balthrop
2	DIRECTOR Cynthia Collins
3	DIRECTOR Stanley C. Erck
4	To ratify the Audit Committees selection of CohnReznick LLP as the independent registered public accounting firm of the Company for its fiscal year ending December 31, 2026.