[Form 4] JANUS HENDERSON GROUP PLC Insider Trading Activity

Rhea-AI Filing Summary

Janus Henderson Group Ltd. director Leslie Seidman reported a disposition of common stock tied to the completion of a merger. On the effective date, 15,756 shares of common stock were converted into the right to receive $52.00 per share in cash under the Merger Agreement, representing an issuer disposition rather than an open-market trade. In addition, 3,288 outstanding restricted stock units were cancelled immediately prior to the merger and exchanged for a lump-sum cash payment based on the same $52.00 Merger Consideration plus accrued but unpaid dividend equivalents. Following these transactions, Seidman no longer holds Janus Henderson common shares in this account.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Seidman Leslie

Role null

Type	Security	Shares	Price	Value
Disposition	Common Stock	15,756	$52.00	$819K

Holdings After Transaction: Common Stock — 0 shares (Direct, null)

Footnotes (1)

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 3,288 outstanding restricted stock units ("RSUs") held by the Reporting Person that were cancelled as of immediately prior to the Effective Time and were exchanged for the right to receive a lump sum cash payment equal to (a)(1) the Merger Consideration, multiplied by (2) the number of shares of the Issuer's common stock subject to such RSUs immediately prior to the Effective Time, plus (b) the amount of any accrued but unpaid dividend equivalent rights.

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/02/2026 - 08:16 PM Accepted by SEC EDGAR 07/02/2026 - 08:16 PM Learn about SEC filing dates

SEC Form 4

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

X

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Seidman Leslie

(Last) (First) (Middle)

201 BISHOPGATE

(Street)

LONDON EC2M 3AE

(City) (State) (Zip)

UNITED KINGDOM

(Country)

2. Issuer Name and Ticker or Trading Symbol
Janus Henderson Group Ltd. [ JHG ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/30/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	06/30/2026		D		15,756(1)(2)	D	$52	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 (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. 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").

2. Includes 3,288 outstanding restricted stock units ("RSUs") held by the Reporting Person that were cancelled as of immediately prior to the Effective Time and were exchanged for the right to receive a lump sum cash payment equal to (a)(1) the Merger Consideration, multiplied by (2) the number of shares of the Issuer's common stock subject to such RSUs immediately prior to the Effective Time, plus (b) the amount of any accrued but unpaid dividend equivalent rights.

	/s/ Lisa Kish, by Power of Attorney for Leslie Seidman	07/02/2026
	** 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.
* Form 4: SEC 1474 (03-26)