Quick Takeaways
- JANUS HENDERSON GROUP PLC filed SCHEDULE 13G/A for METSERA, INC. Common Stock (MTSR).
- Disclosed ownership: 3.1%.
- Date of event: 31 Dec 2025.
JANUS HENDERSON GROUP PLC - 31 Dec 2025 SCHEDULE 13G/A Report for METSERA, INC. Common Stock (MTSR)
- Filing Manager
- JANUS HENDERSON GROUP PLC
- Reporting Manager
- JANUS HENDERSON GROUP PLC
- Security
- METSERA, INC. Common Stock
- Symbol
- MTSR
- Shares outstanding
- 104,608,032 shares
- Disclosed Ownership
- 3,242,849 shares
- Ownership
- 3.1%
- Form type
- SCHEDULE 13G/A
- Filing time
- 17 Feb 2026, 12:35:04 UTC
- Date of event
- 31 Dec 2025
- Previous filing
- 14 Nov 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"JANUS HENDERSON GROUP PLC disclosed 3.1% ownership in METSERA, INC. Common Stock (MTSR) on 31 Dec 2025."
What Changed
- Previous schedule filing date: 14 Nov 2025.
- Current filing was accepted on 17 Feb 2026, 12:35.
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 (1)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| JANUS HENDERSON GROUP PLC | 3.1% | 3,242,849 | 0 | 3,242,849 | Kristin Mariani | Head of North America Compliance |