JANUS HENDERSON FUND MANAGEMENT UK LIMITED

HENDERSON HIGH INCOME TRUST PLC

LEGAL ENTITY IDENTIFIER 213800OEXAGFSF7Y6G11

16 September 2026

HENDERSON HIGH INCOME TRUST PLC

Half Year Update for the half year ended 30 June 2026

The Company released its Half Year Report for the six months ended 30 June 2026 on 9 September 2026. A copy of the report is available to download from the Company's website: www.hendersonhighincome.com.

An abridged extract from the Half Year Report, the Half Year Update, will be sent to shareholders today. The Half Year Update has been submitted to the National Storage Mechanism and will shortly be available for inspection at https://data.fca.org.uk/#/nsm/nationalstoragemechanism. The Half Year Update is also available to download from the Company's website www.hendersonhighincome.com.

Neither the contents of the Company's website nor the contents of any website accessible from hyperlinks on the Company's website (or any other website) is incorporated into, or forms part of, this announcement.

For further information please contact:

Janus Henderson Secretarial Services UK Limited

Corporate Secretary

Telephone: 020 7818 1818

Harriet Hall

PR Director, Investment Trusts

Janus Henderson Investors

Telephone: 020 7818 2919