4basebio Plc - Director's Dealing

19 November 2024 4basebio plc ("4basebio" or the "Company") Director's Dealing 19 November 2024 - 4basebio PLC (AIM: 4BB) ("4basebio" or the "Company"), which develops and commercialises the large scale manufacture of synthetic DNA as well as nanoparticle delivery solutions, announces that it was informed by Heikki Lanckriet, CEO of the Company, that he transferred 46,500 ordinary shares in the Company from his SIPP into his personal account. The transfer was effected by the sale and repurchase of a total of 46,500 ordinary shares at a price of 1,325 pence each. Following the transfer, there is no change to Mr Lanckriet's beneficial holding and his interest in the Company remains at 1,103,288 ordinary shares, representing approximately 7.3 per cent. of the Company's issued share capital. 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. Enquiries 4basebio PLC +44 (0)1223 967 943 Dr. Heikki Lanckriet Nominated Adviser +44 (0)20 7213 0880 Cairn Financial Advisers LLP Jo Turner / Sandy Jamieson / Ed Downes Joint Corporate Broker +44 (0)20 7653 4000 RBC Capital Markets Rupert Walford / Kathryn Deegan Joint Corporate 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. Notification of a Transaction pursuant to Article 19(1) of Regulation (EU) No. 596/2014 1 Details of the person discharging managerial responsibilities/person closely associated a. Name Dr Heikki Lanckriet 2 Reason for notification a. Position/Status CEO b. Initial Initial Notification notification/Amendment 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 financial Ordinary Shares instrument, type of ISIN: GB00BMCLYF79 instrument Identification Code b. Nature of the transaction Transfer of ordinary shares between accounts, via a sale and repurchase, with no resultant change to beneficial holding Price(s) Volume(s) per share (p) 1,325p 93,000 d. Aggregated information · Volume · 93,000 · Price · 1,325 pence per share e. Date of the transaction 15/11/2024 f. Place of the transaction London Stock Exchange, AIM This information was brought to you by Cision http://news.cision.com

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