144/A 0000950170-24-075613 0001553352 XXXXXXXX LIVE 0001719714 Mereo BioPharma Group plc 001-38452 4th Floor, One Cavendish Place London X0 W1G 0QF 44-333 023 7300 Lewicki John A. Officer American Depositary Shares Representing Ordinary Shares Morgan Stanley & Co. LLC

1585 Broadway New York NY 10036-8293

26647 106055.06 765150254 06/25/2024 Nasdaq American Depositary Shares Representing Ordinary Shares 06/21/2024 Same Day Cashless Exercise and Sale Issuer N 69000 06/21/2024 Equity Compensation Y This form 144 amends and supersedes the form 144 filed on June 20, 2024. The name and address of the broker has been corrected. 06/24/2024 /s/ John A. Lewicki