Completion of Acquisition & Total Voting Rights

Gooch & Housego PLC ("G&H", the "Company" or the "Group")

Completion of Acquisition of Global Photonics

and

Total Voting Rights

Gooch & Housego PLC (AIM: GHH), the specialist manufacturer of optical components & systems, is pleased to announce that further to its announcement on 14 May 2025, it has completed the acquisition of U.S.-based Global Photonics.

This acquisition significantly extends G&H's presence in the U.S. Aerospace & Defence market and marks an important step towards replicating the success of the Group's optical systems hub in the UK by establishing a full optical systems engineering and manufacturing capability in the United States.

Issue of Shares and Total Voting Rights

As part of the consideration for the acquisition, the Company has issued 1,328,636 new ordinary shares of 20 pence each in the capital of the Company ("Ordinary Shares") and application has been made to the London Stock Exchange for these new Ordinary Shares to be admitted to trading on AIM ("Admission"). Admission is expected to become effective and dealings in these new Ordinary Shares are expected to commence at 8.00 a.m. on 20 June 2025. These new Ordinary Shares rank pari passu with the existing Ordinary Shares of the Company and will represent approximately 4.9% of the Company's enlarged issued share capital following Admission.

Following the issue of these new Ordinary Shares, the Company's issued share capital will consist of 27,115,033 Ordinary Shares, each with voting rights. The Company does not hold any ordinary shares in treasury. Therefore, the total number of voting rights in the Company will be 27,115,033. This figure may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the Company.

The Company will issue a further 84,477 Ordinary Shares as the final consideration payment on or around 8 October 2025.

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Notes to editors

Gooch & Housego is a photonics technology business headquartered in Ilminster, Somerset, UK with operations in the U.S. and Europe. A world leader in its field, the company researches, designs, engineers and manufactures advanced photonic systems, components and instrumentation for applications in the Aerospace & Defence, Industrial, Life Sciences and Scientific Research sectors. World leading design, development and manufacturing expertise is offered across a broad range of complementary technologies.