Henderson Group: Confirmation of Capital Reduction

Merger of Henderson Group plc and Janus Capital Group Inc.

Confirmation of Reduction of Capital

5 May 2017

Further to the special resolution passed at the Extraordinary General Meeting on 26 April 2017, Henderson Group plc ('Henderson Group') confirms that the nominal value of each share has been reduced from US$0.1547 to US$0.15 with effect from 3 May 2017.

Please see the Circular dated 21 March 2017 for further details.

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In connection with the proposed merger, Henderson has filed a registration statement on Form F-4 with the U.S. Securities and Exchange Commission (SEC), containing a proxy statement of Janus Capital Group and other documents regarding the proposed merger. Before making any voting or investment decision, the respective investors and shareholders of Henderson and Janus Capital Group are urged to carefully read the entire registration statement of Henderson, including the proxy statement of Janus Capital Group, and any other relevant documents filed by either company with the SEC, as well as any amendments or supplements to those documents, because they contain important information about Henderson, Janus Capital Group and the proposed merger. The registration statement and other related documents filed by Henderson and Janus Capital Group will be available electronically without charge at the SEC's website, www.sec.gov. Materials filed with the SEC may also be obtained without charge at Henderson's website, www.henderson.com or at Janus Capital Group's website www.janus.com, respectively.