Notice of Interim Results

For release: 07.00, 4 September 2025

Itaconix plc

("Itaconix" or the "Company")

Notice of Interim Results and Company Presentation

Itaconix (AIM: ITX) (OTCQB: ITXXF), a leading innovator in sustainable plant-based polymers used to decarbonize everyday consumer products, announces that its Interim Results for the year ended 30 June 2025 will be released on 15 September 2025.

Investor Meet Company presentation

A live presentation will be held on 15 September 2025 at 14:00 BST. This presentation is open to all interested parties. Anyone can sign up for free to the Investor Meet Company platform and join the live presentation via:

https://www.investormeetcompany.com/itaconix-plc/register-investor

Questions can be submitted pre-event via your Investor Meet Company dashboard up until 14 Sept 2025, 09:00 BST, or at any time during the live presentation.

- Ends -

Enquiries:

Itaconix plcJohn R. Shaw / Laura DennerTel: +1 603 775 4400

Rosewood (Financial PR)John West / Llew Angus / Lily PearceTel: +44 (0) 20 7653 8704

Canaccord Genuity (Nominated Adviser and Broker)Adam James / Harry PardoeTel: +44 (0) 20 7523 8000

About Itaconix

Itaconix plc develops and markets sustainable plant-based polymers that improve the safety, performance, and environmental profile of everyday consumer and industrial products. Its proprietary platform leverages itaconic acid to produce unique high-performance materials across multiple markets.

www.itaconix.com