Placement of Antin Shares by a Group of Current and Former Partners

Second free float expansion since IPO

Regulatory News:

Antin Infrastructure Partners (Paris:ANTIN):

NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, DIRECTLY OR INDIRECTLY, TO U.S. PERSONS OR IN THE UNITED STATES, CANADA, AUSTRALIA OR JAPAN OR ANY OTHER JURISDICTION WHERE SUCH RELEASE, PUBLICATION OR DISTRIBUTION WOULD BE UNLAWFUL.

Antin Infrastructure Partners (“Antin”) announces that it has been informed of a share placement that expands its free float for the second time since its Initial Public Offering (“IPO”) in September 2021 through the sale (the “Sale”) of Antin shares by a group of current and former partners (the “Sellers”), subject to the settlement of the transaction.

Following the Sale, Antin’s free float increased by c.2.9 million shares, from 15.8% to 17.5% of its outstanding share capital.

The Sellers sold 5.0 million ordinary shares, representing c.2.8% of Antin’s capital, at a price of €7.18 per share. Shares sold by former partners accounted for c.65% of the Sale.

Some members of the Executive Committee, including Alain Rauscher, Chairman and CEO, purchased c.1.4 million shares at the offering price, reflecting their confidence in Antin’s fundamental value and long-term prospects.

Antin purchased c.0.7 million of its own shares at the offering price, pursuant to its share buyback program authorised by Antin’s shareholders at the Annual General Meeting of 10 June 2026.

The Sale follows the second expiry of the IPO lock-up, during which 25% of the shares held by the concert of partners were released. The Sellers and the members of the Executive Committee who placed an order in the Sale have agreed to an additional 90-day lock-up, subject to certain customary exceptions.

The Sale occurred through an accelerated bookbuild offering to certain qualified investors with BNP PARIBAS acting as sole global coordinator and bookrunner.

Alain Rauscher, Chairman and CEO, commented: “This transaction supports the gradual increase of Antin’s free float. The decision of part of our leadership team to increase their personal holdings in Antin as part of this transaction underscores their confidence in the firm’s long-term prospects, supported by secular trends driving the infrastructure asset class.”

About Antin Infrastructure Partners

Antin Infrastructure Partners is a leading private equity firm focused on infrastructure. With over €33bn in Assets under Management across its Flagship, Mid Cap and NextGen investment strategies, Antin targets investments in the energy and environment, digital, transport and social infrastructure sectors. With offices in Paris, London, New York, Seoul, Melbourne and Luxembourg, Antin employs over 250 professionals dedicated to growing, improving and transforming infrastructure businesses while delivering long-term value to portfolio companies and investors. Majority owned by its partners, Antin is listed on compartment A of the regulated market of Euronext Paris (Ticker: ANTIN – ISIN: FR0014005AL0).

DISCLAIMER

This press release is for information purposes only and does not , and shall not, constitute an offer to sell or a solicitation of an offer to buy or subscribe any securities nor a solicitation to offer to purchase or to subscribe securities in any jurisdiction, nor shall there be any sale of such securities, in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

The sale by the Sellers of the Antin's shares does not constitute a public offer and the shares are only being offered by the Sellers to certain qualified investors on a private placement basis, including in France.

No communication and no information in respect of the sale by the Sellers of the Antin's shares may be distributed to the public in any jurisdiction where a registration or approval is required. No steps have been or will be taken in any jurisdiction where such steps would be required. The offer or sale of the Antin's shares on behalf of the Sellers may be subject to specific legal or regulatory restrictions in certain jurisdictions.

European Economic Area

This press release is an advertisement and not a prospectus within the meaning of Regulation (EU) 2017/1129 of the European Parliament and of the Council of June 14, 2017, as amended (the “Prospectus Regulation”).

With respect to the member states of the European Economic Area (the “Member States”), other than France, no action has been or will be taken in order to permit a public offer of the securities which would require the publication of a prospectus in one of such Member States.

France

In France, the offer and sale of Antin's shares by the Sellers have been carried out through an offer to the benefit of qualified investors only as defined in Article 2(e) of the Prospectus Regulation and in accordance with article L. 411-2, 1° of the French Monetary and Financial Code acting for their own account.

United Kingdom

In the United Kingdom, this press release is not an invitation nor an inducement to engage in investment activity for the purpose of Section 21 of the Financial Services and Markets Act 2000, as amended (“FSMA”). This press release is directed in the United Kingdom only at persons who are “qualified investors” (as defined in paragraph 15 of Schedule 1 to the Public Offers and Admissions to Trading Regulations 2024 ) who are (i) persons who have professional experience in matters relating to investments falling within the meaning of article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005, as amended (the “Order”), (ii) persons referred to in Article 49(2) (a) to (d) of the Order (“high net worth entities”, ”non-registered associations”, etc.) and (iii) other persons to whom an invitation or inducement to engage in investment activity (within the meaning of Section 21 of the FSMA may otherwise be lawfully communicated or caused to be communicated (all persons listed in (i), (ii) and (iii) above together being referred to as “Relevant Persons”).

Antin's shares described herein are available only to, and any invitation, offer or agreement to subscribe, purchase or otherwise acquire such shares will be engaged in only with Relevant Persons. Any person who is not a Relevant Person must not act or rely on this document or any of its contents.

This press release is not a prospectus which has been approved by the Financial Conduct Authority or any other United Kingdom regulatory authority for the purposes of Section 85 of the FSMA.

United States

This press release may not be distributed, directly or indirectly, in or into the United States or to U.S. persons (as such terms are defined under the U.S. Securities Act of 1933, as amended (the “Securities Act”)). This press release and the information contained therein does not, and will not, constitute an offer of securities for sale, nor the solicitation of an offer to purchase, securities in the United States or to U.S. persons (as such terms are defined under the Securities Act”) or in any other jurisdiction where restrictions may apply. Securities may not be offered or sold in the United States or to U.S. persons absent registration under the Securities Act, except pursuant to an exemption from, or in a transaction not subject to, the registration requirements thereof. The securities have not been and will not be registered under the Securities Act, and the Sellers do not intend to register any portion of the proposed offering or to conduct a public offering in the United States.

This press release may not be published, forwarded or distributed, directly or indirectly, in Canada, Australia or Japan.

The distribution of this announcement into certain jurisdictions may be restricted by law. No action has been taken by the Sellers that would permit an offering of Antin's shares or possession or distribution of this announcement in any jurisdiction where action for that purpose is required. Persons into whose possession this announcement comes should inform themselves about and observe any such restrictions. Any failure to comply with these restrictions may constitute a violation of the securities laws of any such jurisdiction.

View source version on businesswire.com: https://www.businesswire.com/news/home/20260914256063/en/

Shareholder relations Ludmilla Binet, Head of Shareholder Relations Email: shareholders@antin-ip.com

Media Thomas Kamm, Partner - Head of Communications Nicolle Graugnard, Communication Director Email: media@antin-ip.com

Brunswick Email: antinip@brunswickgroup.com Tristan Roquet Montegon +33 (0) 6 37 00 52 57