4basebio Plc - Director Dealing

4 April 2025 4basebio PLC ("4basebio" or the "Company") Director Dealing Cambridge, UK, 4 April 2025 - 4basebio PLC (AIM: 4BB), an innovation-led provider of novel synthetic DNA products and a non-viral, thermostable nucleic acid delivery platform, announces that it was informed by Dr. Heikki Lanckriet, CEO of the Company, that on 2 April 2025 he made the following purchases in ordinary shares in the capital of the Company through the market, on behalf of his three children. Further details are set out in the Notification of Dealing Form below. Director / Number Purchase Shareholding Shareholding PCA of Price Following Following Ordinary (p) Acquisition Acquisition as Shares a Percentage of Acquired Issued Share Capital Heikki 2,400 1,205 1,117,688 7.21% Lanckriet* *Refers to Heikki Lanckriet and persons closely associated with him. The 2,400 additional shares purchased represent approximately 0.02 per cent. of the Company's issued share capital. The issued share capital of the Company comprises 15,496,393 ordinary shares. This announcement contains inside information for the purposes of Article 7 of EU Regulation 596/2014 as amended by regulation 11 of the market abuse (amendment) (EU Exit) regulations 2019/310. For further enquiries, please contact: 4basebio PLC +44 (0)1223 967 943 Dr. Heikki Lanckriet, CEO Nominated Adviser        +44 (0)20 7213 0880 Cairn Financial Advisers LLP Jo Tuner / Sandy Jamieson / Ed Downes Joint Broker +44 (0)20 7653 4000 RBC Capital Markets Rupert Walford / Max Avison / Kathryn Deegan Joint Broker +44 (0)20 7220 0500 Cavendish Capital Markets Limited Geoff Nash / Nigel Birks Notes to Editors About 4basebio 4basebio (AIM: 4BB) is an innovation driven life biotechnology company focused on accelerating the development of advanced therapy medicinal products (ATMPs) through its high-performance synthetic DNA products and non-viral, cell targeting nucleic acid delivery platform. The Company's objective is to become a market leader in the manufacture and supply of high-quality synthetic DNA products for research, therapeutic and pharmacological use as well as development of target specific non-viral vectors for the efficient delivery of payloads in patients. Forward-looking statements This announcement may contain certain statements about the future outlook for 4basebio.  Although the directors believe their expectations are based on reasonable assumptions, any statements about future outlook may be influenced by factors that could cause actual outcomes and results to be materially different. Notification and public disclosure of transactions by persons discharging managerial responsibilities and persons closely associated with them 1 Details of the persons discharging managerial responsibilities / person closely associated a) Name Heikki Lanckriet 2 Reason for the notification a) Position/Status Chief Executive Officer b) Initial notification/ Amendment Initial notification 3 Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor a) Name 4basebio plc b) LEI 213800E2DX9EAIUNCB30 4 Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted a) Description of the Ordinary Shares financialinstrument, type ISIN: GB00BMCLYF79 ofinstrumentIdentification code b) Nature of the transaction Acquisition of ordinary shares c) Price(s) and volume(s) Date Price(s) Volume(s) 02/04/2025 1,205p 2,400 d) Aggregated information 2,4001,205p -      Aggregated volume-      Price e) Date of transaction 02 April 2025 f) Place of transaction London Stock Exchange This information was brought to you by Cision http://news.cision.com

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