683 Capital Management, LLC - 29 Dec 2025 SCHEDULE 13G Report for Mereo BioPharma Group plc American Depositary Shares, each representing five ordinary shares, nominal value of 0.003 GBP per share (MREO)

Filing Manager
683 Capital Management, LLC
Reporting Manager
683 Capital Management, LLC
Security
Mereo BioPharma Group plc American Depositary Shares, each representing five ordinary shares, nominal value of 0.003 GBP per share
Symbol
MREO
Shares outstanding
795,645,660 shares
Disclosed Ownership
65,083,815 shares
Ownership
8.2%
Form type
SCHEDULE 13G
Filing time
06 Jan 2026, 17:38:48 UTC
Date of event
29 Dec 2025
SEC
View on sec.gov

Quoteable Key Fact

"683 Capital Management, LLC disclosed 8.2% ownership in Mereo BioPharma Group plc American Depositary Shares, each representing five ordinary shares, nominal value of 0.003 GBP per share (MREO) on 29 Dec 2025."

Quick Takeaways

  • 683 Capital Management, LLC filed SCHEDULE 13G for Mereo BioPharma Group plc American Depositary Shares, each representing five ordinary shares, nominal value of 0.003 GBP per share (MREO).
  • Disclosed ownership: 8.2%.
  • Date of event: 29 Dec 2025.

What Changed

  • No earlier schedule filing is available for direct comparison.
  • Current filing was accepted on 06 Jan 2026, 17:38.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Source Evidence

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

Reporting Managers (3)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
683 Capital Management, LLC 8.2% 65,083,815 0 65,083,815 Ari Zweiman Managing Member
683 Capital Partners, LP 8.2% 65,083,815 0 65,083,815 Ari Zweiman Authorized Person
Ari Zweiman 8.2% 65,083,815 0 65,083,815 Ari Zweiman Self
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