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Form 4 JANUS HENDERSON GROUP For: May 12 Filed by: TRIAN FUND MANAGEMENT, L.P.

May 14, 2026 7:36 PM
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person *
Baldwin Brian M
(Last) (First) (Middle)
280 PARK AVENUE, 41ST FLOOR
(Street)
NEW YORK NY 10017
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
JANUS HENDERSON GROUP PLC [ JHG ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director X 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
05/12/2026
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
X Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 05/12/2026 S (1) 6,213,418 D $ 51.6001 25,654,382 I Please see explanation below (2)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
1. The sale reported in this Form 4 was done for portfolio management purposes by certain funds (the "Trian Funds") managed by Trian Fund Management, L.P. ("Trian Management") which primarily hold publicly traded securities. As contemplated by the Voting and Rollover Agreement dated as of December 21, 2025, entered into by and among the Issuer and the other parties thereto, an affiliate of Trian Management will roll over at least 24,750,000 shares of the Issuer in connection with the closing of the previously announced acquisition of the Issuer by Trian Management and its affiliated funds, and General Catalyst and its affiliated funds. Progress toward closing is continuing, with the Issuer's shareholders approving the acquisition on April 16, 2026. The transaction is expected to close in mid-2026, subject to customary closing conditions, including receipt of applicable regulatory approvals and client consents.
2. Trian Management serves as the management company for the Trian Funds and as such determines the investment and voting decisions of the Trian Funds with respect to the shares of the Issuer which they hold. Mr. Baldwin is a member of the Investment Committee and a partner of Trian Management, and a limited partner or member of certain affiliates of the Trian Funds and as such has an indirect interest in the shares of the Issuer held by the Trian Funds. The Reporting Persons disclaim beneficial ownership of such shares except to the extent of their respective pecuniary interests therein and this report shall not be deemed an admission that the Reporting Persons are the beneficial owner of such securities for purposes of Section 16 or for any other purpose. Mr. Baldwin is a director of the Issuer.
/s/ Daniel R. Marx, Attorney-In-Fact for Brian M. Baldwin 05/14/2026
** Signature of Reporting Person Date
/s/ Peter W. May, member of the general partner of Trian Fund Management, L.P. 05/14/2026
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

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