X0206 3 2021-07-29 0 0001287098 MAXCYTE, INC. MXCT 0001241146 THOMPSON J STARK PHD C/O MAXCYTE, INC. 22 FIRSTFIELD ROAD, SUITE 110 GAITHERSBURG MD 20878 1 0 0 0 Common Stock 110918 D Stock Option (right to buy) 0.04 2024-11-11 Common Stock 89333 D Stock Option (right to buy) 1.12 2026-06-13 Common Stock 20400 D Stock Option (right to buy) 3.33 2027-07-14 Common Stock 23900 D Stock Option (right to buy) 3.34 2028-07-18 Common Stock 23900 D Stock Option (right to buy) 2.44 2029-03-04 Common Stock 26900 D Stock Option (right to buy) 1.87 2030-01-20 Common Stock 26900 D Stock Option (right to buy) 14.30 2031-02-16 Common Stock 26900 D This option is fully vested and exercisable. This exercise price is in US Dollars and reflects the conversion of GBP to USD at an exchange rate of GBP 1.00 to $1.3749 as of July 23, 2021. The shares underlying this option vested or shall vest monthly in forty-eight (48) equal monthly installments commencing on August 18, 2018, subject to the Reporting Person's continued service to the Issuer through each vesting date. The shares underlying this option vested or shall vest monthly in forty-eight (48) equal monthly installments commencing on April 4, 2019, subject to the Reporting Person's continued service to the Issuer through each vesting date. The shares underlying this option vested or shall vest monthly in forty-eight (48) equal monthly installments commencing on February 20, 2020, subject to the Reporting Person's continued service to the Issuer through each vesting date. One hundred percent (100%) of the shares underlying this option shall vest on January 13, 2022, subject to the Reporting Person's continued service to the Issuer through each vesting date. Exhibit List - Exhibit 24 - Power of Attorney /s/ Jason Minio, Attorney-in-Fact 2021-07-29