Brian M. Baldwin - 12 May 2026 Form 4 Insider Report for JANUS HENDERSON GROUP PLC (JHG)

Reporting relationship: Director, 10%+ Owner
Issuer ticker: JHG
Reported as of: 12 May 2026
Net transaction value: -$320,612,990
SEC form: 4
Accepted by SEC: 14 May 2026, 19:35:53 UTC
Prior SEC filing: 02 Feb 2023
Source filing: View source filing
Reporting owner signature: /s/ Daniel R. Marx, Attorney-In-Fact for Brian M. Baldwin

Key filing fact

Brian M. Baldwin filed Form 4 for JANUS HENDERSON GROUP PLC (JHG) on 14 May 2026.

Key facts

This page summarizes Brian M. Baldwin's Form 4 filing for JANUS HENDERSON GROUP PLC (JHG).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 14 May 2026, 19:35.

Change

Previous filing in this sequence was filed on 02 Feb 2023.
Current net transaction value: -$320,612,990.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (2)

CIK 0001728954 Primary reporting owner

Baldwin Brian M

Relationship: Director, 10%+ Owner
Address: 280 PARK AVENUE, 41ST FLOOR, NEW YORK
Signature: /s/ Daniel R. Marx, Attorney-In-Fact for Brian M. Baldwin
Signature date: 14 May 2026

CIK 0001345471

TRIAN FUND MANAGEMENT, L.P.

Relationship: Director, 10%+ Owner
Address: 280 PARK AVENUE, 41ST FLOOR, NEW YORK
Signature: /s/ Peter W. May, member of the general partner of Trian Fund Management, L.P.
Signature date: 14 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

JHG transaction

Common Stock

Sale

Transaction value: $320,612,990
Shares: -6,213,418
Change %: -19%
Price: $51.60
Shares after: 25,654,382
Date: 12 May 2026
Ownership: Please see explanation below
Footnotes: F1, F2

JHG transaction

Common Stock

Sale

Transaction value: $320,612,990
Shares: -6,213,418
Change %: -19%
Price: $51.60
Shares after: 25,654,382
Date: 12 May 2026
Ownership: Please see explanation below
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

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.

Footnote F2

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.