SEC Form DEFA14A filed by Janus Henderson Group plc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

Filed by the Registrant x

Filed by a Party other than the Registrant ¨

Check the appropriate box:

¨ Preliminary Proxy Statement

¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨ Definitive Proxy Statement

x Definitive Additional Materials

¨ Soliciting Material Pursuant to §240.14a-12

JANUS HENDERSON GROUP PLC

(Name of Registrant as Specified in its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

x No fee required.

¨ Fee paid previously with preliminary materials.

¨ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

Janus Henderson Group plc posted the following materials in certain of its offices.

Forward Looking Statements

References to the “Funds” herein refer to the U.S. registered investment companies managed by Janus Henderson Investors U.S. LLC and references herein to “Janus Henderson” refer to Janus Henderson Group plc and its affiliates. Certain statements in this communication not based on historical facts are “forward-looking statements” within the meaning of the federal securities laws. Such forward-looking statements involve known and unknown risks and uncertainties that are difficult to predict and could cause our actual results, performance or achievements to differ materially from those discussed. These include statements as to Janus Henderson’s and the Funds’ future expectations, beliefs, plans, strategies, objectives, events, conditions, financial performance, prospects or future events, including with respect to the timing and anticipated benefits of pending and recently completed transactions and strategic partnerships, and expectations regarding opportunities that align with our strategy. In some cases, forward-looking statements can be identified by the use of words such as “may,” “could,” “expect,” “intend,” “plan,” “seek,” “anticipate,” “believe,” “estimate,” “predict,” “potential,” “continue,” “likely,” “will,” “would,” and similar words and phrases. Forward-looking statements are necessarily based on estimates and assumptions that, while considered reasonable by, as applicable, Janus Henderson and the Funds and their respective management, are inherently uncertain. Accordingly, you should not place undue reliance on forward-looking statements, which speak only as of the date they are made and are not guarantees of future performance. Neither Janus Henderson nor the Funds undertake any obligation to publicly update or revise these forward-looking statements.

Various risks, uncertainties, assumptions and factors that could cause Janus Henderson’s or the Funds’ future results to differ materially from those expressed by the forward-looking statements included in this communication include, but are not limited to, the impact of any alternative proposal, Janus Henderson’s and the Funds’ ability to obtain the applicable regulatory, shareholder and other approvals required to consummate the proposed transaction and the timing of the closing of the proposed transaction, including the risks that a condition to closing would not be satisfied within the expected timeframe or at all or that the closing of the proposed transaction would not occur, the outcome of any legal proceedings that may be instituted against the parties and others related to the proposed transaction, that shareholder litigation in connection with the proposed transaction may affect the timing or occurrence of the proposed transaction or result in significant costs of defense, indemnification and liability, unanticipated difficulties or expenditures relating to the proposed transaction, including the impact of the transaction on Janus Henderson’s or the Funds’ business, that the proposed transaction generally may involve unexpected costs, liabilities or delays, that the business of Janus Henderson or the Funds may suffer as a result of uncertainty surrounding the proposed transaction or the identity of the purchaser, that Janus Henderson or the Funds may be adversely affected by other economic, business, and/or competitive factors, including the net asset value of assets in the Funds or certain other of Janus Henderson’s funds, and/or potential difficulties in employee retention as a result of the announcement and pendency of the proposed transaction, changes in interest rates and inflation, changes in trade policies (including the imposition of new or increased tariffs), volatility or disruption in financial markets, Janus Henderson’s investment performance as compared to third-party benchmarks or competitive products, redemptions, and other risks, uncertainties, assumptions, and, with respect to Janus Henderson, factors discussed in Janus Henderson’s Annual Report on Form 10-K for the year ended December 31, 2025, and in other filings or furnishings made by Janus Henderson with the SEC from time to time and, in respect of the Funds, factors discussed in each Funds’ current prospectus.

Important Additional Information and Where to Find It

In connection with the proposed transaction, Janus Henderson filed a definitive proxy statement with the U.S. Securities and Exchange Commission (the “SEC”) on March 11, 2026, which was first mailed to Janus Henderson’s shareholders on or about March 12, 2026 and the Funds filed definitive proxy statements with the SEC on March 2, 2026, which will be sent or provided to Fund shareholders. Janus Henderson and affiliates of Janus Henderson jointly filed a transaction statement on Schedule 13E-3 on March 11, 2026. Janus Henderson and the Funds may also file other documents with the SEC regarding the proposed transaction, including amendments to the proxy statement or Schedule 13E-3. This communication is not a substitute for any proxy statement, the Schedule 13E-3 or any other document that may be filed by Janus Henderson or the Funds with the SEC. INVESTORS AND SECURITY HOLDERS OF JANUS HENDERSON AND THE FUNDS ARE URGED TO READ THE APPLICABLE PROXY STATEMENT, THE SCHEDULE 13E-3 (AS APPLICABLE) AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY, BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION. Investors and security holders will be able to obtain the proxy statement and the Schedule 13E-3 (in each case, when available) and other documents that are filed with the SEC by Janus Henderson and the Funds free of charge from the SEC’s website at https://www.sec.gov or, with respect to Janus Henderson, through the investor relations section of Janus Henderson’s website at https://ir.janushenderson.com.