Quick Takeaways
- JANUS HENDERSON GROUP PLC filed SCHEDULE 13G/A for MEREO BIOPHARMA GROUP PLC American Depositary Shares (MREO).
- Disclosed ownership: 10%.
- Date of event: 30 Sep 2025.
JANUS HENDERSON GROUP PLC - 30 Sep 2025 SCHEDULE 13G/A Report for MEREO BIOPHARMA GROUP PLC American Depositary Shares (MREO)
- Filing Manager
- JANUS HENDERSON GROUP PLC
- Reporting Manager
- JANUS HENDERSON GROUP PLC
- Symbol
- MREO
- Shares outstanding
- 159,707,157 shares
- Disclosed Ownership
- 16,290,130 shares
- Ownership
- 10%
- Form type
- SCHEDULE 13G/A
- Filing time
- 14 Nov 2025, 11:58:57 UTC
- Date of event
- 30 Sep 2025
- Previous filing
- 14 Aug 2025
- Next filing
- 17 Feb 2026
- SEC
- View on sec.gov
Quoteable Key Fact
"JANUS HENDERSON GROUP PLC disclosed 10% ownership in MEREO BIOPHARMA GROUP PLC American Depositary Shares (MREO) on 30 Sep 2025."
What Changed
- Previous schedule filing date: 14 Aug 2025.
- Current filing was accepted on 14 Nov 2025, 11:58.
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
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting Managers (2)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| JANUS HENDERSON GROUP PLC | 10% | 16,290,130 | 0 | 16,290,130 | Kristin Mariani | Head of North America Compliance, CCO | |
| Janus Henderson Biotech Innovation Master Fund Ltd | 8.7% | 13,759,885 | 0 | 13,759,885 | Kristin Mariani | Head of North America Compliance, CCO |