Henderson Group - Final and Extraord Dividend Rate

2016 Final Dividend and First Quarter 2017 Extraordinary Dividend

5 May 2017

Henderson Group plc wishes to confirm that shareholders on the register at 5.00pm on 5 May 2017, the Record Date, will be entitled to a final dividend in respect of the six months ended 31 December 2016 of 7.30 pence per ordinary share.

Shareholders on the register at 5.00pm on 5 May 2017, the Record Date, will also be entitled to an extraordinary dividend in respect of the three months ended 31 March 2017 of 1.85 pence per ordinary share.

For the purposes of the ASX corporate action notification, the final and extraordinary dividends are referred to as the "Combined Dividend". The Combined Dividend will equate to a total dividend amount of 9.15 pence per share.

For holders of CHESS Depositary Interests (CDIs), the A$ or the NZ$ equivalent of the Combined Dividend will be 15.7938 cents* (Australia) and 17.0585 cents* (New Zealand) per CDI respectively.

The Combined Dividend will be paid on 19 May 2017.

The timetable is as follows:

Record Date for dividend Friday 5 May

Processing recommences for requests by CDI holdersto convert CDIs into ordinary shares or by ordinaryshareholders to convert ordinary shares into CDIs Monday 8 May

Dividend payment date Friday 19 May

\* The exchange rates that have been applied in translating the dividend amount are as follows: £1 = A$1.72610 and £1 = NZ$1.86432.

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About Henderson

Henderson is an independent global asset manager, specialising in active investment. Named after its first client and founded in 1934, Henderson is a client-focused global business with over 1,000 employees worldwide and assets under management of £103.1bn (31 March 2017). Its core areas of investment expertise are European equities, global equities, global fixed income, multi-asset and alternatives.

Henderson is dual-listed on the Australian Securities Exchange (ASX) and the London Stock Exchange (LSE) and has a market capitalisation of approximately £2.6bn (May 2017).

Further information can be found at www.henderson.com/IR.

Forward-looking statements and other important information

This announcement contains forward-looking statements with respect to the financial condition, results and business of Henderson Group plc. By their nature, forward-looking statements involve risk and uncertainty because they relate to events, and depend on circumstances, that will occur in the future. Henderson's actual future results may differ materially from the results expressed or implied in these forward-looking statements. Nothing in this announcement should be construed as a profit forecast.

The content of the websites referred to in this announcement is not incorporated into and does not form part of this announcement. Nothing in this announcement should be construed as, or is intended to be, a solicitation for or an offer to provide investment advisory services.

In connection with the proposed merger, Henderson has filed a registration statement on Form F-4 with the 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.