<div id="readability-page-1"><div>RNS Number : 8173O Synthomer PLC 27 June 2025 TR-1: Standard form for notification of major holdings<div><table><tbody><tr><td colspan="7">NOTIFICATION OF MAJOR HOLDINGS (to be sent to the relevant issuer and to the FCA in Microsoft Word format if possible) i</td></tr><tr><td colspan="7"></td></tr><tr><td colspan="3">1a. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attachedii:</td><td colspan="4">Synthomer PLC</td></tr><tr><td colspan="7">1b. Please indicate if the issuer is a non-UK issuer (please mark with an &#34;X&#34; if appropriate)</td></tr><tr><td colspan="6">Non-UK issuer</td><td></td></tr><tr><td colspan="7">2. Reason for the notification (please mark the appropriate box or boxes with an &#34;X&#34;)</td></tr><tr><td colspan="6">An acquisition or disposal of voting rights</td><td>x</td></tr><tr><td colspan="6">An acquisition or disposal of financial instruments</td><td></td></tr><tr><td colspan="6">An event changing the breakdown of voting rights</td><td></td></tr><tr><td colspan="6">Other (please specify) iii:</td><td></td></tr><tr><td colspan="7">3. Details of person subject to the notification obligationiv</td></tr><tr><td colspan="3">Name</td><td colspan="4">Lombard Odier Asset Management (Europe) Limited</td></tr><tr><td colspan="3">City and country of registered office (if applicable)</td><td colspan="4">London, United-Kingdom</td></tr><tr><td colspan="7">4. Full name of shareholder(s) (if different from 3.) v</td></tr><tr><td colspan="3">Name</td><td colspan="4">Disclosure on behalf of accounts managed on a discretionary basis by Lombard Odier Investment Managers group.</td></tr><tr><td colspan="3">City and country of registered office (if applicable)</td><td colspan="4"></td></tr><tr><td colspan="3">5. Date on which the threshold was crossed or reachedvi:</td><td colspan="4">26.06.2025</td></tr><tr><td colspan="3">6. Date on which issuer notified (DD/MM/YYYY):</td><td colspan="4">27.06.2025</td></tr><tr><td colspan="7">7. Total positions of person(s) subject to the notification obligation</td></tr><tr><td></td><td>% of voting rights attached to shares (total of 8. A)</td><td colspan="2">% of voting rights through financial instruments(total of 8.B 1 + 8.B 2)</td><td>Total of both in % (8.A + 8.B)</td><td colspan="2">Total number of voting rights of issuervii</td></tr><tr><td>Resulting situation on the date on which threshold was crossed or reached</td><td>4.99%</td><td colspan="2"></td><td>4.99%</td><td colspan="2">8,176,353</td></tr><tr><td>Position of previous notification (ifapplicable)</td><td>5.37%</td><td colspan="2"></td><td>5.37%</td><td colspan="2"></td></tr></tbody></table></div><div><table><tbody><tr><td colspan="10">8. Notified details of the resulting situation on the date on which the threshold was crossed or reachedviii</td></tr><tr><td colspan="10">A: Voting rights attached to shares</td></tr><tr><td colspan="2" rowspan="2">Class/type ofsharesISIN code (if possible)</td><td colspan="5">Number of voting rightsix</td><td colspan="3">% of voting rights</td></tr><tr><td colspan="2">Direct(Art 9 of Directive 2004/109/EC) (DTR5.1)</td><td colspan="3">Indirect(Art 10 of Directive 2004/109/EC) (DTR5.2.1)</td><td colspan="2">Direct(Art 9 of Directive 2004/109/EC) (DTR5.1)</td><td>Indirect(Art 10 of Directive 2004/109/EC) (DTR5.2.1)</td></tr><tr><td colspan="2">GB00BNTVWJ75</td><td colspan="2"></td><td colspan="3">8,176,353</td><td colspan="2"></td><td>4.99%</td></tr><tr><td colspan="2"></td><td colspan="2"></td><td colspan="3"></td><td colspan="2"></td><td></td></tr><tr><td colspan="2"></td><td colspan="2"></td><td colspan="3"></td><td colspan="2"></td><td></td></tr><tr><td colspan="2">SUBTOTAL 8. A</td><td colspan="5">8,176,353</td><td colspan="3">4.99%</td></tr><tr><td colspan="10"></td></tr><tr><td colspan="10">B 1: Financial Instruments according to Art. 13(1)(a) of Directive 2004/109/EC (DTR5.3.1.1 (a))</td></tr><tr><td colspan="2">Type of financial instrument</td><td>Expirationdatex</td><td colspan="3">Exercise/Conversion Periodxi</td><td colspan="3">Number of voting rights that may be acquired if the instrument isexercised/converted.</td><td>% of voting rights</td></tr><tr><td colspan="2"></td><td></td><td colspan="3"></td><td colspan="3"></td><td></td></tr><tr><td colspan="2"></td><td></td><td colspan="3"></td><td colspan="3"></td><td></td></tr><tr><td colspan="2"></td><td></td><td colspan="3"></td><td colspan="3"></td><td></td></tr><tr><td colspan="2"></td><td></td><td colspan="3">SUBTOTAL 8. B 1</td><td colspan="3"></td><td></td></tr><tr><td colspan="10"></td></tr><tr><td colspan="10">B 2: Financial Instruments with similar economic effect according to Art. 13(1)(b) of Directive 2004/109/EC (DTR5.3.1.1 (b))</td></tr><tr><td>Type of financial instrument</td><td colspan="2">Expirationdatex</td><td colspan="2">Exercise/Conversion Period xi</td><td colspan="3">Physical or cashsettlementxii</td><td>Number of voting rights</td><td>% of voting rights</td></tr><tr><td></td><td colspan="2"></td><td colspan="2"></td><td colspan="3"></td><td></td><td></td></tr><tr><td></td><td colspan="2"></td><td colspan="2"></td><td colspan="3"></td><td></td><td></td></tr><tr><td></td><td colspan="2"></td><td colspan="2"></td><td colspan="3"></td><td></td><td></td></tr><tr><td></td><td colspan="2"></td><td colspan="2"></td><td colspan="3">SUBTOTAL 8.B.2</td><td></td><td></td></tr><tr><td colspan="10"></td></tr></tbody></table></div><div><table><tbody><tr><td colspan="5">9. Information in relation to the person subject to the notification obligation (please mark theapplicable box with an &#34;X&#34;)</td></tr><tr><td colspan="4">Person subject to the notification obligation is not controlled by any natural person or legal entity and does not control any other undertaking(s) holding directly or indirectly an interest in the (underlying) issuerxiii</td><td>x</td></tr><tr><td colspan="4">Full chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held starting with the ultimate controlling natural person or legal entityxiv (please add additional rows as necessary)</td><td></td></tr><tr><td>Namexv</td><td>% of voting rights if it equals or is higher than the notifiable threshold</td><td>% of voting rights through financial instruments if it equals or is higher than the notifiable threshold</td><td colspan="2">Total of both if it equals or is higher than the notifiable threshold</td></tr><tr><td></td><td></td><td></td><td colspan="2"></td></tr><tr><td></td><td></td><td></td><td colspan="2"></td></tr><tr><td></td><td></td><td></td><td colspan="2"></td></tr><tr><td></td><td></td><td></td><td colspan="2"></td></tr><tr><td></td><td></td><td></td><td colspan="2"></td></tr><tr><td colspan="5"></td></tr><tr><td colspan="5">10. In case of proxy voting, please identify:</td></tr><tr><td colspan="2">Name of the proxy holder</td><td colspan="3"></td></tr><tr><td colspan="2">The number and % of voting rights held</td><td colspan="3"></td></tr><tr><td colspan="2">The date until which the voting rights will be held</td><td colspan="3"></td></tr><tr><td colspan="5"></td></tr><tr><td colspan="5">11. Additional informationxvi</td></tr><tr><td colspan="5"></td></tr></tbody></table></div><div><table><tbody><tr><td>Place of completion</td><td>London, United Kingdom</td><td></td></tr><tr><td>Date of completion</td><td>27.06.2025</td><td></td></tr><tr><td colspan="3"></td></tr></tbody></table></div>This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. 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SYNT

Synthomer PLC has reported a major holding notification from Lombard Odier Asset Management, indicating a reduction in voting rights from 5.37% to 4.99%. The notification was made on June 27, 2025, after the threshold was crossed on June 26, 2025. The total number of voting rights held is now 8,176,353 shares. This information is part of the regulatory requirements for major holdings in the company.

REG - Synthomer PLC - Holding(s) in Company