Subsea 7

Major Shareholding Notification • Jun 6, 2025

Subsea 7 S.A. notification of major holding

Luxembourg – 6 June 2025 – Subsea 7 S.A. (Oslo Børs: SUBC, ADR: SUBCY) today announced that, on 6 June 2025, Elliott Investment, L.P. informed the Company that it had crossed thresholds provided for by Luxembourg's Transparency Law of 11 January 2008 on transparency requirements for issuers of securities as amended (the "Transparency Law") as follows:

• · On 2 June 2025 the total number of direct voting rights in the Company according to Article 8 and 9 of the Transparency Law attached to shares was 14,906,620
• · On 2 June 2025 the total number of voting rights in the Company attached to financial instruments with similar economic effect according to Article 12 (1) (a) of the Transparency Law (right to recall) was nil
• · On 2 June 2025 the total number of voting rights in the Company attached to financial instruments with similar economic effect according to Article 12 (1) (b) of the Transparency Law (swaps) was 14,924,404
• · As a result, if voting rights are attributed to the cash-settled equity swaps, the total aggregate ownership interest by Elliott Investment would be 9.95%.

****************************************************************************************************************************************************************************** Subsea7 is a dobal leader in the delivery of offshore projects and services for the evolving energy industry, creating sustainable value by being the industry's partner and employer of choice in delivering the efficient offshore solutions the world needs.

Subsea7 is listed on the Oslo Børs (SUBC), ISIN LU0075646355, LEI 222100AIF0CBCY80AH62. ******************************************************************************************************************************************************************************

Contact for investment community enquiries:

Katherine Tonks Investor Relations Director Tel +44 20 8210 5568 ir@subsea7.com

This information is subject to the disclosure requirements pursuant to the Norwegian Securities Trading Act.

This stock exchange release was published by Katherine Tonks. Investor Relations, Subsea7, on 6 June 2025 16:10 CET