Sec Form 4 Filing - PODZOROV MEGAN @ Janus Henderson Group Ltd. - 2026-06-30

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person PODZOROV MEGAN 2. Issuer Name and Ticker or Trading Symbol Janus Henderson Group Ltd. [ JHG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief People Officer (Last) (First) (Middle) 201 BISHOPGATE 3. Date of Earliest Transaction (MM/DD/YY) 06/30/2026 (Street) LONDONEC2M 3AE 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 06/30/2026 D 1,044 ( 1 ) D $ 52 11,373 D Common Stock 06/30/2026 D 11,373 ( 2 ) D 0 D Common Stock 06/30/2026 A 7,935 ( 3 ) A 7,935 D Common Stock 06/30/2026 D 7,935 ( 4 ) D 0 D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other PODZOROV MEGAN 201 BISHOPGATE LONDONEC2M 3AE Chief People Officer Signatures /s/ Lisa Kish, by Power of Attorney for Megan Podzorov 07/02/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On June 30, 2026, pursuant to that certain Agreement and Plan of Merger, dated as of December 21, 2025 (as amended, including by Amendment No. 1 dated March 24, 2026, and a side letter dated June 16, 2026, the "Merger Agreement"), among the Issuer, Jupiter Company Limited ("Parent"), and Jupiter Merger Sub Limited ("Merger Sub"), Merger Sub merged with and into the Issuer (the "Merger"), with the Issuer surviving as a wholly owned subsidiary of Parent and changing its name to "Janus Henderson Group Ltd." At the effective time of the Merger (the "Effective Time"), each ordinary share of the Issuer (except for ordinary shares held by Parent and as otherwise provided in the Merger Agreement) was converted into the right to receive $52.00 per share in cash, without interest (the "Merger Consideration"). Includes shares purchased under the Issuer's Employee Stock Purchase Plan. ( 2 )At the Effective Time, each outstanding and unvested restricted stock unit award (each, an "Unvested RSU Award") held by the Reporting Person was converted into the contingent right to receive an equity-based award with an initial value equal to (i)(a) the Merger Consideration, multiplied by (b) the number of shares of the Issuer subject to such Unvested RSU Award immediately prior to the Effective Time, plus (ii) the amount of any accrued but unpaid dividend equivalent rights (each, a "Replacement RSU Award"). Following the Effective Time, the value of each Replacement RSU Award will be determined by reference to the value of the applicable class of equity securities of Jupiter Topco LLC ("TopCo") and will be settled in cash or in equity interests in TopCo. ( 3 )Represents a deemed acquisition of shares of the Issuer underlying outstanding and unvested performance restricted stock unit awards ("Unvested PSU Awards") held by the Reporting Person as of immediately prior to the Effective Time based on a deemed satisfaction of the applicable performance goals at 120% of target pursuant to the Merger Agreement. ( 4 )At the Effective Time, each Unvested PSU Award held by the Reporting Person was converted into the contingent right to receive a cash award of equivalent value equal to (i)(a) the Merger Consideration, multiplied by (b) the number of shares of the Issuer subject to such Unvested PSU Award immediately prior to the Effective Time (with any applicable performance goals deemed satisfied at 120% of target), plus (ii) the amount of any accrued but unpaid dividend equivalent rights (each, a "Replacement PSU Award"). Following the Effective Time, the value of each Replacement PSU Award will be determined by reference to the value of the applicable class of equity securities of TopCo and will be settled in cash or in equity interests in TopCo.

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).

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