SCHEDULE 13G/A

MEREO BIOPHARMA GROUP PLC

Ordinary Shares, nominal value 0.003 GBP per share · CUSIP: 589492107

Event date: 2024-12-31

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Adage Capital Management, L.P.

  Shares: 43,575,065.00 · Class: 5.62%

• Adage Capital Partners GP, L.L.C.

  Shares: 0.00 · Class: 0%

• Robert Atchinson

  Shares: 43,575,065.00 · Class: 5.62%

• Phillip Gross

  Shares: 43,575,065.00 · Class: 5.62%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.