Henderson High Income Trust Regulatory News (HHI)

JANUS HENDERSON FUND MANAGEMENT UK LIMITED

HENDERSON HIGH INCOME TRUST PLC

LEGAL ENTITY IDENTIFIER 213800OEXAGFSF7Y6G11

18 November 2025

HENDERSON HIGH INCOME TRUST PLC

PAYMENT OF FOURTH INTERIM DIVIDEND

Henderson High Income Trust plc announces that a fourth interim dividend of 2.775p per ordinary share of 5p, in respect of the year ending 31 December 2025, will be paid on 30 January 2026 to holders registered at the close of business on 12 December 2025. This dividend is to be paid from the Company's revenue account. The Company's shares will go ex-dividend on 11 December 2025.

With the increase in the fourth interim dividend, the total dividend for the year to31 December 2025 will be 10.90p, an increase of 2.8% on the previous year and the Company's 13th consecutive annual increase. The 10.90p dividend for the year to31 December 2025 is expected, based on our current projections for the revenue account, to be fully covered by earnings with a surplus carried to the revenue reserves.

For further information please contact:

David SmithFund ManagerHenderson High Income Trust plcTelephone: 020 7818 4443

Dan HoweHead of Investment TrustsJanus Henderson InvestorsTelephone: 020 7818 1818

Harriet Hall

Investment Trusts PR Director

Janus Henderson Investors

Telephone: 020 7818 2919