8 June 2026

Helical plc

LAUNCH OF SHARE BUYBACK PROGRAMME

Helical plc (the "Company") is pleased to announce that it is today commencing a share buyback programme (the "Programme") to purchase ordinary shares of £0.01 each in the Company (the "Ordinary Shares") with an aggregate value of up to £5 million (excluding expenses). The Programme will commence immediately and shall continue until the earlier of 30 September 2026 and its completion.

The Company has entered into an irrevocable agreement (the "Agreement") with Peel Hunt LLP ("Peel Hunt") to undertake the Programme on the Company's behalf, with Peel Hunt making market purchases, as riskless principal, of the Ordinary Shares on the London Stock Exchange. Peel Hunt will make trading decisions under the Programme independently of the Company, subject to: (i) certain parameters agreed between Peel Hunt and the Company prior to the commencement of the Programme pursuant to the Agreement; and (ii) the Company's right to terminate the Agreement in certain customary circumstances. Any purchases of Ordinary Shares contemplated by this announcement will be subject to the terms of the Agreement.

Any purchases pursuant to the Programme shall take place in accordance with (and subject to the limits prescribed by) the Company's general authority to repurchase Ordinary Shares granted by its shareholders at the annual general meeting in 2025 (the "2025 Shareholder Authority") and any further authority to repurchase Ordinary Shares as may be granted by the Company's shareholders from time to time. The maximum number of Ordinary Shares that the Company is currently authorised to purchase under the 2025 Authority is 12,335,519. The 2025 Shareholder Authority will expire at the earlier of 17 October 2026 and the conclusion of the Company's 2026 AGM. Following the expiry of the 2025 Shareholder Authority, the continuation of the Programme will be conditional on the approval by shareholders of a resolution re-granting the directors' authority to purchase Ordinary Shares at the 2026 AGM and any further purchases will be in accordance with the terms of such approval.

The purpose of the Programme is to return surplus capital to shareholders. Ordinary Shares purchased pursuant to the Programme will be held in treasury and may be used to satisfy future obligations arising from the Company's employee share option programmes. Alternatively, they may be cancelled.

The Programme will be effected in accordance with applicable laws and the regulations of the UK Financial Conduct Authority (including Chapter 9.6 of the UK Listing Rules). The maximum price paid per Ordinary Share will be limited to be no more than the higher of (i) 105 per cent of the average middle market closing price of the Company's Ordinary Shares for the five business days before the purchase is made, and (ii) the higher of the price of the last independent trade and the highest current independent bid on the trading venue where the purchase is carried out. Due to limited liquidity in the Ordinary Shares and in order to proceed with the Programme in an effective manner, the Company's purchases of Ordinary Shares on any trading day may exceed 25 per cent. of the average daily trading volume of Ordinary Shares during the 20 trading days preceding the date of purchase. Accordingly, the Company does not intend to rely on the safe harbour provisions contained in Article 5(1) of the UK version of the Market Abuse Regulation (Regulation (EU) No 596/2014) as incorporated into UK domestic law by virtue of the European Union (Withdrawal) Act 2018.

The Company will announce all purchases of Ordinary Shares pursuant to the Programme by no later than the seventh daily market session following the calendar day on which such purchases occurred.

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