Janus Henderson (JHG) insider filing: MassMutual reports no share ownership

Rhea-AI Filing Summary

Janus Henderson Group plc insider report shows no current holdings. Massachusetts Mutual Life Insurance Company, as the reporting person, states that it does not beneficially own any Janus Henderson ordinary shares as of the event date of 12/21/2025. The report notes that the reporting person may be deemed part of a group that beneficially owns more than ten percent of the company’s outstanding ordinary shares, but it disclaims membership in any such group and disclaims beneficial ownership of securities held by others.

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person^*

MASSACHUSETTS MUTUAL LIFE INSURANCE CO

(Last) (First) (Middle)

1295 STATE STREET

(Street)

SPRINGFIELD MA 01111

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
12/21/2025

3. Issuer Name and Ticker or Trading Symbol
JANUS HENDERSON GROUP PLC [ JHG ]

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

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

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

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

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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

The Reporting Person may be deemed to be a member of a group for purposes of Rule 13d-5 of the Securities Exchange Act of 1934, as amended, that beneficially owns more than ten percent of the outstanding Issuer ordinary shares. The filing of this report shall not be deemed to be an admission that the Reporting Person is a member of any such group, and the Reporting Person disclaims beneficial ownership of any securities beneficially owned by such other members.

No securities are beneficially owned.

	MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY, By: /s/ Jaime Genua, Name: Jaime Genua, Title: Assistant Secretary	12/31/2025
	** 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 5 (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.

FAQ

What insider ownership did Janus Henderson Group (JHG) report in this filing?

The filing states that the reporting person, Massachusetts Mutual Life Insurance Company, has no securities beneficially owned in Janus Henderson Group plc.

Who is the reporting person in this Janus Henderson Group (JHG) insider report?

The reporting person is Massachusetts Mutual Life Insurance Company, with the form signed by Jaime Genua, Assistant Secretary.

What is the significance of the more than ten percent ownership reference for JHG?

The report notes that the reporting person may be deemed part of a group that beneficially owns more than ten percent of Janus Henderson’s outstanding ordinary shares, but it disclaims being a member of such a group.

Does Massachusetts Mutual Life Insurance Company claim membership in a JHG shareholder group?

No. The filing explicitly states that it shall not be deemed an admission that the reporting person is a member of any such group.

What is the effective event date for this Janus Henderson Group (JHG) insider ownership report?

The date of the event requiring the statement is listed as 12/21/2025.

Is this insider report filed by one or multiple reporting persons for JHG?

The form indicates it is filed by one reporting person, not by more than one reporting person.