Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
TRIAN FUND MANAGEMENT, L.P. - 21 Dec 2025 SCHEDULE 13D/A Report for JANUS HENDERSON GROUP PLC Ordinary Shares, $1.50 per share par value (JHG)
- Filing manager
- TRIAN FUND MANAGEMENT, L.P.
- Reporting owner
- TRIAN FUND MANAGEMENT, L.P.
- Beneficially owned shares
- 31,867,800 shares
- Large-stake signal
-
Ownership
21%Beneficial ownership of this reported class.
Shares
31,867,800 sharesShares beneficially owned as disclosed.
Event date
21 Dec 2025Date tied to the ownership event or amendment.
Accepted by SEC
22 Dec 2025EDGAR acceptance date.
How to read this large-stake filing
- Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
- Compare this filing with the holder history and issuer page before treating the percentage as a current position.
- Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
- Class ownership
- 21%
- Symbol
- JHG
- Shares outstanding
- 154,698,058 shares
- SEC form
- SCHEDULE 13D/A
- Accepted by SEC
- 22 Dec 2025, 21:56:07 UTC
- Event date
- 21 Dec 2025
- Prior SEC filing
- 27 Oct 2025
- Next SEC filing
- 24 Mar 2026
- Source filing
- View source filing
Ownership signal
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Subject security
Names, identifiers, and filing context for this profile.
2 source fields
Source evidence
Original filing metadata and source links for verification.
6 source fields
Key filing fact
TRIAN FUND MANAGEMENT, L.P. disclosed 21% ownership in JANUS HENDERSON GROUP PLC Ordinary Shares, $1.50 per share par value (JHG) on 21 Dec 2025.
Key facts
- TRIAN FUND MANAGEMENT, L.P. filed SCHEDULE 13D/A for JANUS HENDERSON GROUP PLC Ordinary Shares, $1.50 per share par value (JHG).
- Disclosed ownership: 21%.
- Date of event: 21 Dec 2025.
Change
- Previous schedule filing date: 27 Oct 2025.
- Current filing was accepted on 22 Dec 2025, 21:56.
Research use
- This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
- Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.
Evidence
Backed by Schedule 13D/13G
View source filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Disclosed reporting parties (5)
Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares owned | Sole voting power | Shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Nelson Peltz | 21% | 31,867,800 | 0 | 31,867,800 | /s/ Nelson Peltz | Nelson Peltz | |
| Peter W. May | 21% | 31,867,800 | 0 | 31,867,800 | /s/ Peter W. May | Peter W. May | |
| TRIAN FUND MANAGEMENT, L.P. | 21% | 31,867,800 | 0 | 31,867,800 | /s/ Peter W. May | Member of the General Partner of the Reporting Person | 0001345471 |
| Trian Fund Management GP, LLC | 21% | 31,867,800 | 0 | 31,867,800 | /s/ Peter W. May | Member | |
| Trian Partners AM Holdco II, Ltd. | 21% | 31,867,800 | 0 | 31,867,800 | /s/ Peter W. May | Member |
CIK / CUSIP context first