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 Manager: TRIAN FUND MANAGEMENT, L.P.
Security: JANUS HENDERSON GROUP PLC Ordinary Shares, $1.50 per share par value
Symbol: JHG
Shares outstanding: 155M shares
Disclosed Ownership: 31.9M shares
Ownership: 20.6%
Form type: SCHEDULE 13D/A
Filing time: 22 Dec 2025, 21:56:07 UTC
Date of event: 21 Dec 2025
Previous filing: 27 Oct 2025
SEC: View on sec.gov

Reporting Managers (5)

Name	Ownership	Shares Owned	shared voting power	Signature	Title	CIK
Nelson Peltz	20.6%	31.9M	31.9M	/s/ Nelson Peltz	Nelson Peltz
Peter W. May	20.6%	31.9M	31.9M	/s/ Peter W. May	Peter W. May
TRIAN FUND MANAGEMENT, L.P.	20.6%	31.9M	31.9M	/s/ Peter W. May	Member of the General Partner of the Reporting Person	0001345471
Trian Fund Management GP, LLC	20.6%	31.9M	31.9M	/s/ Peter W. May	Member
Trian Partners AM Holdco II, Ltd.	20.6%	31.9M	31.9M	/s/ Peter W. May	Member