EcoR1 Capital, LLC - 02 Jan 2026 SCHEDULE 13G Report for Mereo BioPharma Group plc Ordinary Shares (MREO)

Filing Manager
EcoR1 Capital, LLC
Reporting Manager
EcoR1 Capital, LLC
Security
Mereo BioPharma Group plc Ordinary Shares
Symbol
MREO
Shares outstanding
792,553,191 shares
Disclosed Ownership
74,500,000 shares
Ownership
9.4%
Form type
SCHEDULE 13G
Filing time
09 Jan 2026, 17:24:27 UTC
Date of event
02 Jan 2026
SEC
View on sec.gov

Reporting Managers (3)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
EcoR1 Capital, LLC 9.4% 74,500,000 0 74,500,000 /s/ Oleg Nodelman Manager
Oleg Nodelman 9.4% 74,500,000 0 74,500,000 /s/ Oleg Nodelman Reporting person
EcoR1 Capital Fund Qualified, L.P. 8.8% 69,802,840 0 69,802,840 /s/ Oleg Nodelman Manager of the General Partner, EcoR1 Capital, LLC