TRIAN FUND MANAGEMENT, L.P. - 24 Mar 2026 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 Manager: TRIAN FUND MANAGEMENT, L.P.
Security: JANUS HENDERSON GROUP PLC Ordinary Shares, $1.50 per share par value
Symbol: JHG
Shares outstanding: 153,950,725 shares
Disclosed Ownership: 31,867,800 shares
Ownership: 21%
Form type: SCHEDULE 13D/A
Filing time: 24 Mar 2026, 21:54:03 UTC
Date of event: 24 Mar 2026
Previous filing: 22 Dec 2025
Next filing: 14 May 2026
SEC: View on sec.gov

Quoteable Key Fact

"TRIAN FUND MANAGEMENT, L.P. disclosed 21% ownership in JANUS HENDERSON GROUP PLC Ordinary Shares, $1.50 per share par value (JHG) on 24 Mar 2026."

Quick Takeaways

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: 24 Mar 2026.

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.

Backed by Schedule 13D/13G

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

Name	Ownership	Shares Owned	shared voting power	Signature	Title	CIK
Nelson Peltz	21%	31,867,800	31,867,800	/s/ Nelson Peltz	Nelson Peltz
Peter W. May	21%	31,867,800	31,867,800	/s/ Peter W. May	Peter W. May
TRIAN FUND MANAGEMENT, L.P.	21%	31,867,800	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	31,867,800	/s/ Peter W. May	Member
Trian Partners AM Holdco II, Ltd.	21%	31,867,800	31,867,800	/s/ Peter W. May	Director