Director Declaration

JANUS HENDERSON FUND MANAGEMENT UK LIMITED

HENDERSON HIGH INCOME TRUST PLC

LEGAL ENTITY IDENTIFIER: 213800OEXAGFSF7Y6G11

1 April 2026

HENDERSON HIGH INCOME TRUST PLC

Director Declaration

In accordance with UK Listing Rule 6.4.9, Henderson High Income Trust plc announces that Francesca Ecsery, a non-executive director of the Company, has been appointed a non-executive director of Aberdeen New India Investment Trust PLC with effect from 1 April 2026.

For further information please contact:

Janus Henderson Secretarial Services UK Limited

Corporate Secretary to Henderson High Income Trust plc

Telephone: 020 7818 1818

Harriet Hall

PR Director, Investment Trusts

Janus Henderson Investors

Telephone: 020 7818 2919