Henderson High Income Trust Regulatory News (HHI)

JANUS HENDERSON FUND MANAGEMENT UK LIMITED

HENDERSON HIGH INCOME TRUST PLC

LEGAL ENTITY IDENTIFIER 213800OEXAGFSF7Y6G11

1 October 2025

HENDERSON HIGH INCOME TRUST PLC ("the Company")

Total Voting Rights and Capital

In conformity with Disclosure and Transparency Rule 5.6.1 we would like to notify the market of the following:

As at 30 September 2025, the Company's capital consisted of 172,141,700 ordinary shares of 5p with voting rights, of which 2,183,318 ordinary shares were held in Treasury. Shares held in Treasury do not possess voting rights. Holders of the Company's ordinary shares are entitled to one vote for every share held. Therefore, the total number of voting rights in the Company is 169,958,382.

The above figure (169,958,382) 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, or a change to their interest in, the voting rights of the Company under the FCA's Disclosure Guidance and Transparency Rules.

For further information, please call:

Harriet Hall

Investment Trusts PR Director

Janus Henderson Investors

Telephone: 020 7818 2919