Posting of Annual Report and Notice of GM

3 March 2023

Oncimmune Holdings plc

("Oncimmune" or the "Company")

Posting of Annual Report and Notice of General Meeting

Oncimmune Holdings plc (AIM: ONC.L), the leading global immunodiagnostics group, gives notice that its Annual Report and Accounts for the financial period ended 31 August 2022 (the "Annual Report") has today been sent to shareholders along with notice of a General Meeting ("GM"). The business of the GM will be, amongst other things, to receive the Annual Report and to approve the report on Directors' remuneration. The GM will be held at 10:00 am GMT on 27 March 2023 at the offices of Pinsent Masons LLP, 30 Crown Place, Earl Street, London, EC2A 4ES.

The Company's Annual Report and Accounts for the financial period ended 31 August 2022 and the Notice of GM can also be viewed on the "Investors" section of the Company's website at www.oncimmune.com.

For further information:

Oncimmune Holdings plc

Dr Adam M Hill, Chief Executive Officer

Matthew Hall, Chief Financial Officer

contact@oncimmune.co.uk

Singer Capital Markets (Nominated Adviser and Joint Broker)

Aubrey Powell, Harry Gooden, George Tzimas, James Fischer

+44 (0)20 7496 3000

Zeus (Joint Broker)

Dominic King, Victoria Ayton, Dan Bate

+44 (0)20 3829 5000

For more information, visit www.oncimmune.com