THIS ANNOUNCEMENT AND THE INFORMATION CONTAINED HEREIN IS RESTRICTED AND IS NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, DIRECTLY OR INDIRECTLY, IN, INTO OR FROM THE UNITED STATES, AUSTRALIA, CANADA, JAPAN, NEW ZEALAND, THE REPUBLIC OF SOUTH AFRICA OR ANY OTHER JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OR REGULATIONS OF THAT JURISDICTION. PLEASE SEE THE IMPORTANT NOTICES AT THE END OF THIS ANNOUNCEMENT.

THIS ANNOUNCEMENT IS FOR INFORMATION PURPOSES ONLY AND DOES NOT CONSTITUTE OR CONTAIN ANY INVITATION, SOLICITATION, RECOMMENDATION, OFFER OR ADVICE TO ANY PERSON TO SUBSCRIBE FOR, OTHERWISE ACQUIRE OR DISPOSE OF ANY SECURITIES IN ONCIMMUNE HOLDINGS PLC OR ANY OTHER ENTITY IN ANY JURISDICTION. NEITHER THIS ANNOUNCEMENT NOR THE FACT OF ITS DISTRIBUTION, SHALL FORM THE BASIS OF, OR BE RELIED ON IN CONNECTION WITH ANY INVESTMENT DECISION IN RESPECT OF ONCIMMUNE HOLDINGS PLC.

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION FOR THE PURPOSES OF THE MARKET ABUSE REGULATION (596/2014/EU) ("MAR"). UPON THE PUBLICATION OF THIS ANNOUNCEMENT, THIS INSIDE INFORMATION IS NOW CONSIDERED TO BE IN THE PUBLIC DOMAIN.

12 December 2022

Oncimmune Holdings plc

("Oncimmune" or the "Company")

Extension of Capital Raising

Oncimmune Holdings plc (AIM: ONC.L), the leading global immunodiagnostics group, announces that the closing of the Capital Raising announced at 2.00 p.m. on 7 December 2022, is now extended to 4.30 p.m. on Tuesday 13 December.  This extension has been made to allow management to update shareholders on the Company's recent progress and to provide additional time to participate in the Placing.

Admission of the Capital Raising Shares is now expected to become effective, and dealings in such shares to commence, at 8.00 a.m. on Friday 16 December 2022.

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, Joint Broker and Bookrunner)

Aubrey Powell, Harry Gooden, George Tzimas, James Fischer

+44 (0)20 7496 3000

WG Partners (Joint Broker)

David Wilson, Nigel Barnes, Erland Sternby

+44 (0)20 3705 9321

About Oncimmune

ImmunoINSIGHTS Service Business

Oncimmune is a leading immunodiagnostics developer, primarily focused on the growing fields of immuno-oncology, autoimmune disease and infectious diseases. The ImmunoINSIGHTS service business leverages Oncimmune's technology platform and methodologies across multiple diseases, to offer life-science organizations actionable insights for therapies across the development and product lifecycle. Our core immune-profiling technology is underpinned by our library of over eight thousand immunogenic proteins, one of the largest of its kind. This helps identify trial participants and patients into clinically relevant subgroups, enabling development of targeted and more effective treatments.

Oncimmune's ImmunoINSIGHTS service business is based at the Company's discovery research centre in Dortmund, Germany. The business platform enables life science organizations to optimize drug development and delivery, leading to more effectively targeted and safer treatments for patients.

The ImmunoINSIGHTS development team is based in the US and Europe and Oncimmune is seeking to replicate the Dortmund facility in the US in the medium term.

EarlyCDT Product Business

Oncimmune's immunodiagnostic technology, EarlyCDT®, can detect and help identify cancer on average four years earlier than standard clinical diagnosis. Our lead diagnostic test, EarlyCDT® Lung, targets a vast market estimated to grow to £3.8bn by 2024. With over 200,000 tests already performed for patients worldwide and its use being supported by peer reviewed data in over 12,000 patients, we are poised to become an integral component of future lung cancer detection programs, globally.

Oncimmune's diagnostic products business is located at its laboratory facility in Nottingham, UK.             

For more information, visit www.oncimmune.com

IMPORTANT NOTICES

Neither this announcement ("Announcement"), nor any copy of it, may be taken or transmitted, published or distributed, directly or indirectly, in whole or in part, in or into the United States, Australia, Canada, Japan, New Zealand or the Republic of South Africa or to any persons in any of those jurisdictions or any other jurisdiction where to do so would constitute a violation of the relevant securities laws of such jurisdiction (each, a "Restricted Jurisdiction"). This Announcement is for information purposes only and neither it, nor the information contained in it, shall constitute an offer to sell or issue, or the solicitation of an offer to buy, acquire or subscribe for any shares in the capital of the Company in the United States, Australia, Canada, Japan, New Zealand or the Republic of South Africa or any other state or jurisdiction in which such offer or solicitation is not authorised or to any person to whom it is unlawful to make such offer or solicitation. Any failure to comply with these restrictions may constitute a violation of securities laws of such jurisdictions.

The Placing Shares have not been and will not be registered under the U.S. Securities Act of 1933, as amended (the "Securities Act"), or with any securities regulatory authority or under any securities laws of any state or other jurisdiction of the United States and may not be offered, sold, resold, pledged, transferred or delivered, directly or indirectly, in or into the United States except pursuant to an applicable exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and in compliance with the securities laws of any state or other jurisdiction of the United States.

No action has been taken by the Company, Singer Capital Markets or WG Partners together, the "Joint Brokers"), or any of their respective directors, officers, partners, agents, employees, affiliates, advisors, consultants or, in the case of the Joint Brokers, persons connected with them as defined in the Financial Services and Markets Act 2000, as amended ("FSMA") (together, "Affiliates") that would permit an offer of the Placing Shares or possession or distribution of this Announcement or any other publicity material relating to such Placing Shares in any jurisdiction where action for that purpose is required. Persons receiving this Announcement are required to inform themselves about and to observe any restrictions contained in this Announcement.

Persons (including, without limitation, nominees and trustees) who have a contractual or other legal obligation to forward a copy of this Announcement should seek appropriate advice before taking any action.

This Announcement has not been approved by the Financial Conduct Authority or the London Stock Exchange.

No offering document or prospectus will be made available in connection with the matters contained or referred to in this Announcement and no such offering document or prospectus is required to be published, in accordance with Regulation (EU) 2017/1129 (the "EU Prospectus Regulation") or Regulation (EU) 2017/1129, as amended and retained in UK law on 31 December 2020 by the European Union (Withdrawal) Act 2018 (the "EUWA") (the "UK Prospectus Regulation"). No public offering of the Placing Shares is being made by any person anywhere and the Company has not authorised or consented to any such offering in relation to the Placing Shares.

This Announcement is for information purposes only and is directed only at: (a) in a Member State of the European Economic Area ("EEA"), persons who are "qualified investors" within the meaning of Article 2(e) of the EU Prospectus Regulation (as amended and/or supplemented from time to time and includes any relevant implementing measure in any Member State); and (b) in the United Kingdom, persons who are "qualified investors" within the meaning of Article 2(e) of the UK Prospectus Regulation who are also: (i) "investment professionals" within the meaning of Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (the "Order"); or (ii) persons falling within Article 49(2)(a) to (d) ("high net worth companies, unincorporated associations, etc") of the Order; or (c) otherwise, persons to whom it may otherwise be lawful to communicate them (all such persons in (a), (b) and (c), together being referred to as "Relevant Persons"). This Announcement must not be acted on or relied on by persons who are not Relevant Persons.

This Announcement is not being distributed by, nor has it been approved for the purposes of section 21 of FSMA by, a person authorised under FSMA. This Announcement is being distributed and communicated to persons in the United Kingdom only in circumstances in which section 21(1) of FSMA does not require approval of the communication by an authorised person.

This Announcement has been issued by, and is the sole responsibility of, the Company. No responsibility or liability is or will be accepted by, and no undertaking, representation or warranty or other assurance, express or implied, is or will be made or given by either of the Joint Brokers, or by any of their respective Affiliates as to, or in relation to, the accuracy, fairness or completeness of the information or opinions contained in this Announcement or any other written or oral information made available to or publicly available to any interested person or its advisers, and any liability therefore is expressly disclaimed.

None of the information in this Announcement has been independently verified or approved by either of the Joint Brokers or any of their Affiliates. Save for any responsibilities or liabilities, if any, imposed on the Joint Brokers by FSMA or by the regulatory regime established under it, no responsibility or liability whatsoever whether arising in tort, contract or otherwise, is accepted by either of the Joint Brokers or any of their respective Affiliates whatsoever for the contents of the information contained in this Announcement (including, but not limited to, any errors, omissions or inaccuracies in the information or any opinions) or for any other statement made or purported to be made by or on behalf of either of the Joint Brokers or any of their respective Affiliates in connection with the Company, the Capital Raising Shares or the Capital Raising or for any loss, cost or damage suffered or incurred howsoever arising, directly or indirectly, from any use of this Announcement or its contents or otherwise in connection with this Announcement or from any acts or omissions of the Company in relation to the Capital Raising. Each of the Joint Brokers and their respective Affiliates accordingly disclaim all and any responsibility and liability whatsoever, whether arising in tort, contract or otherwise (save as referred to above) in respect of any statements or other information contained in this Announcement and no representation or warranty, express or implied, is made by either of the Joint Brokers or any of their respective Affiliates as to the accuracy, completeness or sufficiency of the information contained in this Announcement.

Singer Capital Markets, which is authorised and regulated in the United Kingdom by the Financial Conduct Authority (the "FCA") and is a member of the London Stock Exchange, is acting as the Company's Bookrunner and as Joint Broker. Singer Capital Markets is not acting for any other person in connection with the matters referred to in this Announcement and will not be responsible to anyone other than the Company for providing the protections afforded to clients of Singer Capital Markets or for giving advice in relation to the matters referred to in this Announcement. Singer Capital Markets has not authorised the contents of this Announcement and, without limiting the statutory rights of any person to whom this Announcement is issued, no representation or warranty, express or implied, is made by Singer Capital Markets as to any of the contents or the completeness of this Announcement and Singer Capital Markets does not accept responsibility for this Announcement and accordingly disclaims all and any liability, whether arising in tort, contract or otherwise, which it might otherwise be found to have in respect of this Announcement.

Singer Capital Markets Advisory LLP ("SCM Advisory"), which is authorised and regulated in the United Kingdom by the FCA, is acting as the Company's Nominated Adviser for the purposesof the AIM Rules for Companies. SCM Advisory is not acting for any other person in connection with the matters referred to in this Announcement and will not be responsible to anyone other than the Company for providing the protections afforded to clients of SCM Advisory or for giving advice in relation to the matters referred to in this Announcement. SCM Advisory has not authorised the contents of this Announcement and, without limiting the statutory rights of any person to whom this Announcement is issued, no representation or warranty, express or implied, is made by SCM Advisory as to any of the contents or the completeness of this Announcement and SCM Advisory does not accept responsibility for this Announcement and accordingly disclaims all and any liability, whether arising in tort, contract or otherwise, which it might otherwise be found to have in respect of this Announcement. SCM Advisory's responsibilities as the Company's nominated adviser under the aIM Rules for Nominated Advisers are owed solely to the London Stock Exchange and are not owed to the Company or to any director or to any other person.

WG Partners, which is authorised and regulated in the United Kingdom by the FCA and is a member of the London Stock Exchange, is acting as Joint Broker to the Company. WG Partners is not acting for any other person in connection with the matters referred to in this Announcement and will not be responsible to anyone other than the Company for providing the protections afforded to clients of WG Partners or for giving advice in relation to the matters referred to in this Announcement. WG Partners has not authorised the contents of this Announcement and, without limiting the statutory rights of any person to whom this Announcement is issued, no representation or warranty, express or implied, is made by WG Partners as to any of the contents or the completeness of this Announcement and WG Partners does not accept responsibility for this Announcement and accordingly disclaims all and any liability, whether arising in tort, contract or otherwise, which it might otherwise be found to have in respect of this Announcement.

Certain statements in this Announcement are forward-looking statements, which include all statements other than statements of historical fact and which are based on the Company's expectations, intentions and projections regarding its future performance, anticipated events or trends and other matters that are not historical facts. These forward-looking statements, which may use words such as "aim", "anticipate", "believe", "could", "may", "intend", "estimate", "expect" and words of similar meaning, include all matters that are not historical facts. These forward-looking statements involve risks, assumptions and uncertainties that could cause the actual results of operations, financial condition, liquidity and dividend policy and the development of the industries in which the Company's businesses operate to differ materially from the impression created by the forward-looking statements. These statements are not guarantees of future performance and are subject to known and unknown risks, uncertainties and other factors that could cause actual results to differ materially from those expressed or implied by such forward-looking statements. Given those risks and uncertainties, prospective investors are cautioned not to place undue reliance on forward-looking statements. Forward-looking statements speak only as of the date of such statements and, except as required by the FCA, the London Stock Exchange or applicable law, the Company, the Joint Brokers and their respective Affiliates undertakes no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise.

No statement in this Announcement is intended to be a profit forecast and no statement in this Announcement should be interpreted to mean that earnings per share of the Company for the current or future financial years would necessarily match or exceed the historical published earnings per share of the Company.

This Announcement does not identify or suggest, or purport to identify or suggest, the risks (direct or indirect) that may be associated with an investment in the Placing Shares. Any investment decision to buy Placing Shares in the Placing must be made solely on the basis of publicly available information, which has not been independently verified by the Joint Brokers. This Announcement is not intended to provide the basis for any decision in respect of the Company or other evaluation of any securities of the Company or any other entity and should not be considered as a recommendation that any investor should subscribe for, purchase, otherwise acquire, sell or otherwise dispose of any such securities. Recipients of this Announcement should conduct their own investigation, evaluation and analysis of the business, data and property described in this Announcement. Any indication in this Announcement of the price at which the Company's shares have been bought or sold in the past cannot be relied upon as a guide to future performance. The price and value of securities can go down as well as up.

The contents of this Announcement are not to be construed as legal, business, financial or tax advice. Each shareholder or prospective investor should consult with his or her or its own legal adviser, business adviser, financial adviser or tax adviser for legal, financial, business or tax advice.

In connection with the Placing, the Joint Brokers and any of their respective Affiliates, acting as investors for their own account, may take up a portion of the Placing Shares in the Placing as a principal position and in that capacity may retain, purchase, sell, offer to sell for the own accounts or otherwise deal for their own account in such Placing Shares and other securities of the Company or related investments in connection with the Placing or otherwise. Accordingly, references to Placing Shares being offered, acquired, placed or otherwise dealt in should be read as including any issue or offer to, or acquisition, placing or dealing by, the Joint Brokers and any of their respective Affiliates acting in such capacity. In addition, the Joint Brokers and any of their respective Affiliates may enter into financing arrangements (including swaps, warrants or contracts for difference) with investors in connection with which the Joint Brokers and any of their respective Affiliates may from me to me acquire, hold or dispose of shares. The Joint Brokers do not intend to disclose the extent of any such investment or transactions otherwise than in accordance with any legal or regulatory obligations to do so.

The Placing Shares to be issued pursuant to the Placing will not be admitted to trading on any stock exchange other than the London Stock Exchange.

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

UK Product Governance Requirements

Solely for the purposes of the product governance requirements contained within the FCA Handbook Product Intervention and Product Governance Sourcebook (the "UK Product Governance Rules"), and disclaiming all and any liability, whether arising in tort, contract or otherwise, which any 'manufacturer' (for the purposes of the UK Product Governance Rules) may otherwise have with respect thereto, the Placing Shares have been subject to a product approval process, which has determined that the Placing Shares are: (i) compatible with an end target market of (a) retail clients, as defined in point (8) of Article 2 of Regulation (EU) No 2017/565 as it forms part of domestic law by virtue of the EUWA, (b) investors who meet the criteria of professional clients as defined in Regulation (EU) No 600/2014 as it forms part of domestic law by virtue of the EUWA and (c) eligible counterparties as defined in chapter 3 of the FCA Handbook Conduct of Business Sourcebook ("COBS"); and (ii) eligible for distribution through all distribution channels as are permitted by Directive 2014/65/EU (the "UK Target Market Assessment"). Notwithstanding the UK Target Market Assessment, distributors should note that: the price of the Placing Shares may decline and investors could lose all or part of their investment; the Placing Shares offer no guaranteed income and no capital protection; and an investment in the Placing Shares is compatible only with investors who do not need a guaranteed income or capital protection, who (either alone or in conjunction with an appropriate financial or other adviser) are capable of evaluating the merits and risks of such an investment and who have sufficient resources to be able to bear any losses that may result therefrom. The UK Target Market Assessment is without prejudice to the requirements of any contractual, legal or regulatory selling restrictions in relation to the Placing. Furthermore, it is noted that, notwithstanding the UK Target Market Assessment, the Joint Brokers will only procure investors who meet the criteria of professional clients and eligible counterparties. For the avoidance of doubt, the UK Target Market Assessment does not constitute: (a) an assessment of suitability or appropriateness for the purposes of COBS; or (b) a recommendation to any investor or group of investors to invest in, or purchase, or take any other action whatsoever with respect to the Placing Shares. Each distributor is responsible for undertaking its own target market assessment in respect of the Placing Shares and determining appropriate distribution channels.

EU Product Governance Requirements

Solely for the purposes of the product governance requirements contained within: (a) EU Directive 2014/65/EU on markets in financial instruments, as amended ("MiFID II"); (b) Articles 9 and 10 of Commission Delegated Directive (EU) 2017/593 supplementing MiFID II; and (c) local implementing measures (together, the "MiFID II Product Governance Requirements"), and disclaiming all and any liability, whether arising in tort, contract or otherwise, which any 'manufacturer' (for the purposes of the MiFID II Product Governance Requirements) may otherwise have with respect thereto, the Shares have been subject to a product approval process, which has determined that the Shares are: (i) compatible with an end target market of retail clients and investors who meet the criteria of professional clients and eligible counterparties, each as defined in MiFID II; and (ii) eligible for distribution through all distribution channels as are permitted by MiFID II (the "EU Target Market Assessment"). Notwithstanding the EU Target Market Assessment, distributors should note that: the price of the Shares may decline and investors could lose all or part of their investment; the Shares offer no guaranteed income and no capital protection; and an investment in the Placing Shares is compatible only with investors who do not need a guaranteed income or capital protection, who (either alone or in conjunction with an appropriate financial or other adviser) are capable of evaluating the merits and risks of such an investment and who have sufficient resources to be able to bear any losses that may result therefrom. The EU Target Market Assessment is without prejudice to the requirements of any contractual, legal or regulatory selling restrictions in relation to the Placing. Furthermore, it is noted that, notwithstanding the EU Target Market Assessment, the Joint Brokers will only procure investors who meet the criteria of professional clients and eligible counterparties.

For the avoidance of doubt, the EU Target Market Assessment does not constitute: (a) an assessment of suitability or appropriateness for the purposes of MiFID II; or (b) a recommendation to any investor or group of investors to invest in, or purchase or take any other action whatsoever with respect to the Placing Shares. Each distributor is responsible for undertaking its own target market assessment in respect of the Placing Shares and determining appropriate distribution channels.