Transaction in Own Shares.

8 May 2026

GCP Infrastructure Investments Limited

(the "Company" or "GCP Infra")

LEI: 213800W64MNATSIV5Z47

Transaction in own shares

GCP Infrastructure Investments Limited ("Company") announces that, in accordance with the terms of its share buyback programme (the "Programme") announced on 12 December 2024, it has purchased the following number of its ordinary shares of 1 pence each ("Ordinary Shares") through RBC Europe Limited.

Following the above transaction, the Company will have 884,797,669 Ordinary Shares in issue (including treasury shares). The total number of Ordinary Shares held in treasury is 67,072,143.

The total number of voting rights in the Company, excluding treasury shares as at 8 May 2026 is 817,725,526. This figure may be used by shareholders (and others with notification obligations) 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, Company or its Group under the FCA's Disclosure and Transparency Rules.

Since the announcement of the Programme on 12 December 2024, the Company has purchased 50,087,124 Ordinary Shares in aggregate for treasury.

For further information, please contact:

In accordance with Article 5(1)(b) of Regulation (EU) No 596/2014 (the Market Abuse Regulation), a breakdown of the individual trades made by RBC Europe Limited on behalf of the Company as part of the Programme is detailed below:

This announcement does not constitute, or form part of, an offer or any solicitation of an offer for securities in any jurisdiction.

Notes to Editors

GCP Infra is a closed-ended investment company and FTSE-250 constituent whose shares are traded on the main market of the London Stock Exchange. Its objective is to provide shareholders with regular, sustained, long-term distributions and to preserve capital over the long term by generating exposure to UK infrastructure debt and related and/or similar assets.

The Company primarily targets investments in infrastructure projects with long term, public sector-backed, availability-based revenues. Where possible, investments are structured to benefit from partial inflation protection. GCP Infra is advised by Gravis Capital Management Limited.

GCP Infra has been awarded with the London Stock Exchange's Green Economy Mark in recognition of its contribution to positive environmental outcomes.