Results of the Scheme and Issue of New Shares

THIS ANNOUNCEMENT AND THE INFORMATION CONTAINED IN IT ARE NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, DIRECTLY OR INDIRECTLY, IN WHOLE OR IN PART, IN OR INTO, THE UNITED STATES OF AMERICA (INCLUDING ITS TERRITORIES AND POSSESSIONS, ANY STATE OF THE UNITED STATES AND THE DISTRICT OF COLUMBIA), AUSTRALIA, CANADA, JAPAN, THE REPUBLIC OF SOUTH AFRICA, IN ANY MEMBER STATE OF THE EEA OR IN ANY OTHER JURISIDCTION IN WHICH THE SAME WOULD BE UNLAWFUL.

JANUS HENDERSON FUND MANAGEMENT UK LIMITED

HENDERSON HIGH INCOME TRUST PLC

LEGAL ENTITY IDENTIFIER 213800OEXAGFSF7Y6G11

16 January 2024

HENDERSON HIGH INCOME TRUST PLC

Results of the Scheme and Issue of New Shares

In connection with the combination of the assets of the Company with the assets of Henderson Diversified Income Trust plc ("HDIV"), which was approved by HDIV Shareholders earlier today, the Board of Henderson High Income Trust plc (the "Company" or "HHI") is pleased to announce that the Company will acquire approximately £72 million of net assets from HDIV in consideration for the issue of 42,345,422 New Shares to HDIV Shareholders in accordance with the Scheme.

The number of New Shares to be issued was calculated based on a HHI FAV per Share of 170.245412 pence and an HDIV FAV per Share of 72.055120 pence, producing a conversion ratio of approximately 0.423242 New Shares for every HDIV Share rolling over, each calculated in accordance with the Scheme. As set out in the Shareholder circular published by the Company on 12 December 2023 (the "Circular"), fractions of New Shares arising as a result of the conversion ratio will not be issued under the Scheme and entitlements to such New Shares will be rounded down to the nearest whole number.

Applications have been made for the New Shares to be admitted to listing on the premium segment of the Official List of the Financial Conduct Authority and to trading on the main market for listed securities of the London Stock Exchange (together, "Admission"). It is expected that Admission will take place at 8.00 a.m. on 17 January 2024.

Following the issue of the New Shares noted above, the Company's share capital will consist of 172,141,700 Ordinary Shares, with each Ordinary Share holding one voting right. No Ordinary Shares are held in treasury.

The figure of 172,141,700 Ordinary Shares may be used by Shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in voting rights, or a change to their interest in the Company, under the Disclosure Guidance and Transparency Rules.

Capitalised terms used but not defined in this announcement will have the same meaning as set out in the Circular.

For further information please contact:

General

This announcement is not for publication or distribution, directly or indirectly, in or into the United States of America. This announcement is not an offer of securities for sale into the United States. The securities referred to herein have not been and will not be registered under the US Securities Act of 1933, as amended, and may not be offered or sold in the United States, except pursuant to an applicable exemption from registration. No public offering of securities is being made in the United States.