0000919574-22-006922.txt : 20221130 0000919574-22-006922.hdr.sgml : 20221130 20221129205916 ACCESSION NUMBER: 0000919574-22-006922 CONFORMED SUBMISSION TYPE: 144 PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20221130 DATE AS OF CHANGE: 20221129 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: MAXCYTE, INC. CENTRAL INDEX KEY: 0001287098 STANDARD INDUSTRIAL CLASSIFICATION: SERVICES-COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH [8731] IRS NUMBER: 522210438 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 144 SEC ACT: 1933 Act SEC FILE NUMBER: 001-40674 FILM NUMBER: 221434102 BUSINESS ADDRESS: STREET 1: 22 FIRSTFIELD ROAD STREET 2: SUITE 250 CITY: GAITHERSBURG STATE: MD ZIP: 20878 BUSINESS PHONE: 301-517-5556 MAIL ADDRESS: STREET 1: 22 FIRSTFIELD ROAD STREET 2: SUITE 250 CITY: GAITHERSBURG STATE: MD ZIP: 20878 FORMER COMPANY: FORMER CONFORMED NAME: MAXCYTE INC DATE OF NAME CHANGE: 20040415 REPORTING-OWNER: COMPANY DATA: COMPANY CONFORMED NAME: Casdin Partners Master Fund, L.P. CENTRAL INDEX KEY: 0001534265 IRS NUMBER: 981020311 STATE OF INCORPORATION: E9 FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 144 BUSINESS ADDRESS: STREET 1: WALKER HOUSE STREET 2: 87 MARY STREET CITY: GEORGE TOWN STATE: E9 ZIP: KY1-9001 BUSINESS PHONE: 212.300.5575 MAIL ADDRESS: STREET 1: WALKER HOUSE STREET 2: 87 MARY STREET CITY: GEORGE TOWN STATE: E9 ZIP: KY1-9001 144 1 primary_doc.xml 144 0001534265 XXXXXXXX LIVE 0001287098 MAXCYTE, INC. 001-40674 9713 Key West Avenue, Suite 400 Rockville MD 20850 000-000-0000 Casdin Partners Master Fund, L.P. Former 10% stockholder Common Stock, par value $0.01 per share Stifel Nicolaus & Company, Incorporated

One Financial Plaza 501 North Broadway St. Louis MO 63102

10000 58208.65 102046769 11/29/2022 NASDAQ Common Stock, par value $0.01 per share 08/27/2020 Purchase The shares were purchased in open market transactions. N 10000 08/27/2020 Cash N Casdin Partners Master Fund, L.P.

1350 Avenue of the Americas, Suite 2600 New York NY 10019

Common Stock, par value $0.01 per share 11/21/2022 10000 60412.60 Casdin Partners Master Fund, L.P.

1350 Avenue of the Americas, Suite 2600 New York NY 10019

Common Stock, par value $0.01 per share 11/18/2022 5000 31407.27 Casdin Partners Master Fund, L.P.

1350 Avenue of the Americas, Suite 2600 New York NY 10019

Common Stock, par value $0.01 per share 11/17/2022 4800 30374.33 Casdin Partners Master Fund, L.P.

1350 Avenue of the Americas, Suite 2600 New York NY 10019

Common Stock, par value $0.01 per share 11/16/2022 25200 168354.36 Casdin Partners Master Fund, L.P.

1350 Avenue of the Americas, Suite 2600 New York NY 10019

Common Stock, par value $0.01 per share 11/15/2022 35000 238112.51 Casdin Partners Master Fund, L.P.

1350 Avenue of the Americas, Suite 2600 New York NY 10019

Common Stock, par value $0.01 per share 11/09/2022 175000 1103532.50 Casdin Partners Master Fund, L.P.

1350 Avenue of the Americas, Suite 2600 New York NY 10019

Common Stock, par value $0.01 per share 11/08/2022 175000 1172517.50 Casdin Partners Master Fund, L.P.

1350 Avenue of the Americas, Suite 2600 New York NY 10019

Common Stock, par value $0.01 per share 10/03/2022 735786 4525083.90 11/29/2022 /s/ Eli Casdin