Trian Fund Management Amends 13D/A on Janus Henderson Stake

TL;DR

**Trian's updated 13D/A on Janus Henderson means activist pressure is likely continuing.**

AI Summary

Trian Fund Management, L.P. filed an amended Schedule 13D/A on March 24, 2026, regarding its beneficial ownership in Janus Henderson Group PLC. This filing updates previous disclosures about Trian's stake, indicating a continued active interest in the company. For investors, this matters because Trian is known as an activist investor, and their involvement often signals potential strategic changes or efforts to unlock shareholder value, which could impact Janus Henderson's stock performance.

Why It Matters

This filing signals Trian Fund Management's ongoing activist interest in Janus Henderson Group PLC, potentially leading to strategic changes that could affect the company's valuation and stock price.

Risk Assessment

Risk Level: medium — Activist investor involvement can lead to significant changes, which carry both upside potential and execution risks for the company and its shareholders.

Analyst Insight

Investors should monitor future announcements from Janus Henderson Group PLC and Trian Fund Management, L.P. for any strategic changes or proposals, as Trian's activist involvement could lead to significant corporate actions.

Key Players & Entities

• Trian Fund Management, L.P. (company) — the entity filing the Schedule 13D/A
• Janus Henderson Group PLC (company) — the subject company of the Schedule 13D/A
• March 24, 2026 (date) — the filing date of the Schedule 13D/A
• 0001345471 (person) — CIK for Trian Fund Management, L.P.
• 0001274173 (person) — CIK for Janus Henderson Group PLC

FAQ

Key Financial Figures

• $616,600,000 — n million six hundred thousand dollars ($616,600,000), as may be adjusted in accordance with

Filing Documents

• primary_doc.html (SCHEDULE 13D/A)
• primary_doc.xml (SCHEDULE 13D/A) — 22KB
• c115968_ex11.htm (EX-11) — 88KB
• 0000930413-26-000860.txt ( ) — 111KB

From the Filing

11 EXECUTION VERSION March 24, 2026 Jupiter Company Limited c/o Trian Fund Management, L.P. 280 Park Avenue 41 st Floor New York, NY 10017 Re: Amended and Restated Equity Financing Commitment Ladies and Gentlemen: Reference is made to the Agreement and Plan of Merger, dated as of December 21, 2025, as amended by Amendment No. 1 thereto dated as of the date hereof (as amended, supplemented or otherwise modified from time to time in accordance with its terms, the “ Merger Agreement ”), by and among Jupiter Company Limited, a private limited company organized under the laws of Jersey (“ Parent ”), Jupiter Merger Sub Limited, a private limited company organized under the laws of Jersey (“ Merger Sub ” and, together with Parent, the “ Parent Entities ”), and Janus Henderson Group plc, a public limited company organized under the laws of Jersey (the “ Company ”). Pursuant to the Merger Agreement, on the terms and subject to the conditions set forth therein, among other things, Parent will acquire the Company by causing the merger of Merger Sub with and into the Company, with the Company surviving as a wholly owned subsidiary of Parent (the “ Merger ”) or, following a Switch, via a Scheme of Arrangement. Reference is also made to (a) that certain Equity Commitment Letter delivered to Parent by the GC Investor as of the date hereof, (b) the other Equity Commitment Letter delivered to Parent by the QIA Investor on December 21, 2025 (collectively, the “ Other Equity Commitment Letters ,” and together with this letter agreement, the “ Equity Commitment Letters ”), (c) the Guarantee (as defined below) and (d) the other Limited Guarantees, dated as of December 21, 2025, delivered to the Company by the GC Investor and the QIA Investor (collectively, the “ Other Guarantees ,” and together with the Guarantee (as defined below), the “ Guarantees ”). Each capitalized term used but not otherwise defined herein shall have the meaning ascribed to such term in the Merger Agreement. Each Person listed on Schedule A hereto is referred to herein as an “ Equity Investor ” and, such Persons collectively, the “ Equity Investors ,” and each of the “Equity Investors” under the Other Equity Commitment Letters are referred to herein as an “ Other Equity Investor ” and collectively as the “ Other Equity Investors ”. This letter agreement is being delivered by the Equity Investors to Parent in connection with the execution and delivery of the Merger Agreement. 1. Commitment . Closing, directly or indirectly, equity interests of Parent (collectively, the “ Subject Equity Securities ”) for an aggregate purchase price, in the form of cash in immediately available U.S. funds to Parent, in an amount equal to such Equity Investor’s pro rata share, as set forth opposite such Equity Investor’s name on Schedule A hereto (such proportion for such Equity Investor, as may be adjusted pursuant to the terms hereof, being its “ Pro Rata Share ”), of six hundred sixteen million six hundred thousand dollars ($616,600,000), as may be adjusted in accordance with this letter agreement (the “ Equity Financing Commitment ”), such that the aggregate purchase price for all such equity interests purchased by all such Equity Investors shall equal the Equity Financing Commitment. The Equity Financing Commitment shall be used by the Parent Entities solely for the purpose of funding at the Closing, along with the other proceeds of the Financing (when funded), the Financing Amounts pursuant to and in accordance with the terms and conditions of the Merger Agreement, and not for any other purpose; provided , that each Equity Investor (together with its permitted assigns, as applicable) shall not under any circumstances be obligated under this letter agreement to fund an amount in excess of its Pro Rata Share of the Equity Financing Commitment. The Equity Investors’ obligations to fund their Pro Rata Shares of the Equity Financing Commitment are several and not joint or joint and several such that each Equity Investor (together with its permitted assigns, as applicable) is only obligated to fund its Pro Rata Share of the Equity Financing Commitment, subject to the terms and conditions herein. The obligation of each Equity Investor (together with its permitted assigns, as applicable) to fund its Pro Rata Share of the Equity Financing Commitment is the Closing set forth in Sections 8.1 and 8.2 of the Merger Agreement (other than those conditions that by their nature are to be satisfied at the Closing, but subject to such conditions being able to be satisfied (or waived)); (b) the prior or substantially concurrent (i) consummation of the Exchange (as defined in the Voting and Rollover Agreement), and (ii) funding of the proceed

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