Update re Equity Issuance

JANUS HENDERSON FUND MANAGEMENT UK LIMITED

HENDERSON HIGH INCOME TRUST PLC

LEGAL ENTITY IDENTIFIER 213800OEXAGFSF7Y6G11

11 November 2022

HENDERSON HIGH INCOME TRUST PLC

Update re Equity Issuance

This announcement is made to highlight to the market that the Company has authority to issue shares at a premium to net asset value as announced and up to the amount specified in the authority announced on 24 May 2022.  Any interest in such issuance should be coordinated through to JPMorgan Securities PLC. There can however be no certainty that the Company will issue shares pursuant to this authority.

This announcement is only intended for investment professionals, high net worth companies, partnerships, associations or trusts and investment personnel of any of the foregoing (each as defined within the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005) and any other persons to whom it may be communicated lawfully. No other person should act or rely on it.

For further information please contact:

William Simmonds

Corporate Broker

JPMorgan Cazenove

Tel: 020 7742 4000

Dan Howe

Head of Investment Trusts

Janus Henderson Investors

Telephone: 020 7818 4458

Harriet Hall

Investment Trust PR Manager

Janus Henderson Investors

Telephone: 020 7818 2919