X0202 SCHEDULE 13D 0001486180 XXXXXXXX LIVE Equity 07/31/2026 false 0001287098 57777K106 MAXCYTE, INC.

9713 KEY WEST AVENUE, SUITE 400 ROCKVILLE MD 20850

Nusayhah Ghaboos 0203 908 8791 30 Coleman Street London X0 EC2R 5AL 0001486180 N RIVER GLOBAL INVESTORS LLP OO N X0 834100.00 0.00 834100.00 0.00 834100.00 N 0.8 IV Equity MAXCYTE, INC. 9713 KEY WEST AVENUE, SUITE 400 ROCKVILLE MD 20850 River Global Investors LLP 30 Coleman Street, London, EC2R 5AL, United Kingdom Investment Firm 30 Coleman Street, London, EC2R 5AL, United Kingdom No No United Kingdom N/A (b) An extraordinary corporate transaction, such as a merger, reorganization or liquidation, involving the issuer or any of its subsidiaries. As per the Announcement on 24 June 2026 (RNS Number: 4421J), the FCA has approved the change in control and proposed acquisition of River Global Holdings Limited. Subsequently, as of close of business on 31 July 2026, Liontrust Investment Partners (LIP) LLP assumed responsibility for the River Global Investors (RGI) LLP ICVC and ICAV funds. The relevant voting rights (approx 4.3%) attached to those holdings have therefore transferred from RGI LLP to LIP LLP. The remaining voting rights (approx 0.8%) continue to be held by RGI LLP and will be transferred at a later stage. 834,100.00 0.7786% 834,100.00 shares As of Date B/S Amount Price 05/20/2026 BUY 14000 1.0443 06/16/2026 SELL 22320 1.13 07/23/2026 SELL 100000 1.1022 07/24/2026 SELL 100000 1.0873 07/27/2026 BUY 19780 1.0738 07/27/2026 SELL 275200 1.0397 07/28/2026 SELL 85400 0.9879 07/28/2026 SELL 239400 0.9978 07/29/2026 SELL 5547 1.015 07/29/2026 SELL 269453 1.0201 N/A 07/31/2026 N/A N/A RIVER GLOBAL INVESTORS LLP Nusayhah Ghaboos 08/04/2026