Seafox, Horizon and Mazrui vote for Board changes

Gulf Marine Services PLC

('GMS' or the 'Company')

Seafox, Horizon and Mazrui vote for Board changes

GMS announces today that Seafox International Limited ("Seafox"), Horizon Energy LLC ("Horizon") and Mazrui Investments LLC ("Mazrui") have submitted their intention to vote by proxy, collectively, 170,575,984 of the Company's shares (the "Shares"), or 48.67 per cent. of the Shares, at the Requisitioned General Meeting (as defined below) in favour of all the Seafox Resolutions (as defined below). Based on the votes by proxy that the Company has received, if Seafox, Horizon and Mazrui do not change their votes prior to the Requisitioned General Meeting, the Company expects that the Seafox Resolutions will each duly pass.

On 13 October 2020, the Company announced that a shareholder circular and notice of a general meeting to be held on 10 November 2020 had been published to consider resolutions (the "Seafox Resolutions") to: (i) remove Mr. Mike Turner, Mr. David Blewden, Mr. Mo Bississo and Dr. Shona Grant as directors of the Company; and (ii) appoint Mr. Rashad Saif Al Jarwan, Mr. Mansour Al Alami and Mr. Saeed Mer Abdulla Khoory (the "Seafox Nominees") as directors of the Company (the "Requisitioned General Meeting").

If the Seafox Resolutions pass, the following will occur with immediate effect:

· Mr. Mike Turner, Independent Non-Executive Director, Senior Independent Director and Chairman of the Remuneration Committee, will leave the Board;

· Mr. David Blewden, Independent Non-Executive Director, and Chairman of the Audit Committee, will leave the Board;

· Mr. Mo Bississo, Non-Executive Director, will leave the Board;

· Dr. Shona Grant, Independent Non-Executive Director, will leave the Board;

· Mr. Tim Summers, the Company's Executive Chairman, Chairman of the Nomination Committee and Chief Executive Officer, as previously announced, will leave the Board. In addition, he will leave his role as Chief Executive Officer of the Company following a period of notice;

· Mr. Stephen Kersley, Chief Financial Officer, will leave the Company following a period of notice;

· Mr. Rashad Saif Al Jarwan will join the Board as a Non-Executive Director;

· Mr. Mansour Al Alami will join the Board as a Non-Executive Director; and

· Mr. Saeed Mer Abdulla Khoory will join the Board as a Non-Executive Director.

The Board encourages all shareholders to review the Circular and vote AGAINST the Seafox Resolutions, which if passed would result in the Board being constituted, solely, of the three Seafox nominees.

Enquiries:

MAR

The information contained within this announcement is considered by the Company to constitute inside information as stipulated under the Market Abuse Regulation (EU) No. 596/2014. Upon the publication of this announcement via a Regulatory Information Service, this inside information will be considered to be in the public domain.

The person responsible for arranging for the release of this announcement on behalf of GMS is Tony Hunter, Company Secretary.

ABOUT GMS

GMS, a company listed on the London Stock Exchange, was founded in Abu Dhabi in 1977 and has become a world-leading provider of advanced self-propelled self-elevating support vessels (SESVs). The fleet serves the oil, gas and renewable energy industries from its offices in the United Arab Emirates and Saudi Arabia. The Group's assets are capable of serving clients' requirements across the globe, including those in the Middle East, South East Asia, West Africa, North America, the Gulf of Mexico and Europe.

The GMS fleet of 13 SESVs is amongst the youngest in the industry, with an average age of eight years. The vessels support GMS's clients in a broad range of offshore oil and gas platform refurbishment and maintenance activities, well intervention work and offshore wind turbine maintenance work (which are opex-led activities), as well as offshore oil and gas platform installation and decommissioning and offshore wind turbine installation (which are capex-led activities).

The SESVs are categorised by size - K-Class (Small), S-Class (Mid) and E-Class (Large) - with these capable of operating in water depths of 45m to 80m depending on leg length. The vessels are four-legged and are self-propelled, which means they do not require tugs or similar support vessels for moves between locations in the field; this makes them significantly more cost-effective and time-efficient than conventional offshore support vessels without self-propulsion. They have a large deck space, crane capacity and accommodation facilities (for up to 300 people) that can be adapted to the requirements of the Group's clients.

The Company's Legal Entity Identifier is 213800IGS2QE89SAJF77.