Gulf Marine Services PLC
Gulf Marine Services PLC is a public limited company incorporated in England and Wales under company number 08860816, registered on 24 January 2014, with its registered office in London, United Kingdom. Its current status at Companies House is Active. Although the company is headquartered and operates from Abu Dhabi, United Arab Emirates, it is a UK-incorporated legal entity rather than one registered in the UAE.
Gulf Marine Services PLC, together with its subsidiaries, operates a fleet of self-propelled, self-elevating support vessels (SESVs) that provide stable offshore platforms for accommodation, maintenance, construction and decommissioning work across the offshore oil, gas and renewable energy sectors. The fleet is grouped into K-Class, S-Class, E-Class and other vessel categories, with vessels built and maintained in Abu Dhabi and deployed across the Gulf Cooperation Council region, the wider Middle East, West Africa, Southeast Asia and Europe.
The company’s ordinary shares are listed on the Main Market of the London Stock Exchange under the ticker GMS (ISIN GB00BJVWTM27). For the financial year ended 31 December 2025, Gulf Marine Services PLC reported consolidated revenue of US$188.1 million, a 12% increase on 2024’s US$167.5 million, and consolidated Adjusted EBITDA of US$112.9 million. Consolidated net profit fell 49% year-on-year to US$19.5 million, reflecting impairment charges and higher tax expenses, while average fleet utilisation declined to 87% (2024: 92%). Net bank debt reduced by 22% to US$156.6 million, taking net leverage to 1.39x. The Board did not declare a dividend for 2025, citing the geopolitical situation in the Gulf region. Order backlog stood at US$606 million at year-end 2025, up from US$480 million a year earlier. Since the year-end, management has flagged that escalating regional tensions since January 2026 have prompted a reassessment of 2026 Adjusted EBITDA guidance, after one customer declared force majeure.
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Shareholders
1
As a company admitted to trading on the London Stock Exchange, Gulf Marine Services PLC discloses only holdings that meet the UK Disclosure Guidance and Transparency Rules (DTR5) notification threshold (3% or more of voting rights), rather than a complete shareholder register. Because its shares trade on a UK regulated market, Companies House confirms the company is exempt from disclosing a Person with Significant Control (PSC).
The largest disclosed shareholder is MZI Holding Limited, which held 261,680,095 ordinary shares. This holding represented 24.46% of voting rights as of 31 December 2024, and 23.16% as of 8 April 2025 (the share count was unchanged; the percentage moved because total voting rights in issue increased). MZI Holding Limited became the registered holder following an internal restructuring completed on 24 September 2024, in which Mazrui Investments LLC, previously the direct shareholder, transferred its stake to its own parent company, MZI Holding Limited, both based in Abu Dhabi, UAE.
A further disclosed substantial holding is that of Bank of America Corporation, notified via Merrill Lynch International (London) on 6 May 2026, representing approximately 6.86% of voting rights.
Ultimate beneficial ownership
No natural-person ultimate beneficial owner has been officially disclosed. The largest reported holder, MZI Holding Limited, is itself a corporate entity, and no regulatory filing identified in this research traces the holding to a named individual.
Data availability
Major shareholders only: UK-listed companies disclose substantial shareholdings above the DTR5 threshold via Regulatory News Service (RNS) notifications but do not publish a full shareholder register. Gulf Marine Services PLC is exempt from PSC disclosure at Companies House because its voting shares trade on a UK regulated market.
Sources
- Companies House – Persons with Significant Control statement, Gulf Marine Services PLC (08860816)
- London Stock Exchange RNS – Holding(s) in Company, MZI Holding Limited, 7 October 2024
- London Stock Exchange RNS – Holding(s) in Company, Bank of America Corporation, 6 May 2026
- Investegate – Gulf Marine Services PLC company announcements
Registry feed — rows exactly as filed with Ministry of Economy & Tourism — National Economic Register / Emirate-level DEDs, including entries the profile above does not cover.
| Shareholder | Type | Holding | Source Document |
|---|---|---|---|
| SEI Institutional Investment Tr-Screened World Equity Ex-U.S. Fd | 100% | Ministry of Economy & Tourism — National Economic Register / Emirate-level DEDs |
Officers
7
Gulf Marine Services PLC has six active officers on record at Companies House: five directors and one company secretary. The board comprises Mansour Al Alami (Director, appointed 10 November 2020, Canadian nationality, UAE-based), Haifa Ahmed Rashed Al Mubarak (Director, appointed 11 October 2023, Emirati nationality, UAE-based), Charbel Elias El Khoury (Director, appointed 23 August 2021, Lebanese nationality, UAE-based), Jyrki Koskelo (Director, appointed 5 February 2021, Finnish nationality, Austria-based) and Anthony Tudor St John, Lord St John of Bletso (Director, appointed 26 May 2021, British nationality, England-based). Anthony George Hunter has served as Company Secretary since 10 November 2020. A further 24 former officers are recorded, reflecting board turnover since incorporation in January 2014.
Recent officer changes
- Haifa Ahmed Rashed Al Mubarak appointed Director, effective 11 October 2023 (Companies House filing).
- Rashed Saif Saeed Al Jarwan Al Shamsi resigned as Director, effective 3 August 2023 (Companies House filing).
- Hassan Mohamed Hassanien Heikal resigned as Director, effective 4 September 2024 (Companies House filing).
Data availability
Full: Companies House publishes current and historical officer appointments for Gulf Marine Services PLC, including appointment and resignation dates and officially disclosed nationality. Country of residence is disclosed at country level only; occupation and correspondence-address detail beyond the statutory minimum are not separately published.
Sources
- Companies House – Officers, Gulf Marine Services PLC (08860816)
- Companies House – Filing history, Gulf Marine Services PLC (08860816)
Registry feed — rows exactly as filed with Ministry of Economy & Tourism — National Economic Register / Emirate-level DEDs, including entries the profile above does not cover.
Group Structure
Gulf Marine Services PLC is the ultimate holding company of the Gulf Marine Services group. No PSC or parent entity is disclosed for it at Companies House, because its shares trade on a UK regulated market, which exempts it from PSC reporting. One verified direct subsidiary was identified in official records: Gulf Marine Services (UK) Limited, a Scotland-registered company (SC395183) in which Gulf Marine Services PLC has been recorded as holding 75% or more of shares and voting rights since 6 April 2016. The wider operating fleet is referenced in the company’s annual report as being managed through additional UAE-based Group entities, but their registration details could not be independently verified through the sources reviewed for this profile.
Verified corporate relationships
| Entity | Country | Registration number | Relationship | Ownership | Status | Information date |
|---|---|---|---|---|---|---|
| Gulf Marine Services (UK) Limited | United Kingdom (Scotland) | SC395183 | Direct subsidiary | 75% or more (exact percentage not disclosed) | Active | 6 April 2016 |
Data availability
Partial: UK company registry filings confirm one direct subsidiary with an official ownership-threshold disclosure. Gulf Marine Services PLC’s other operating subsidiaries, referenced in its annual report as part of the wider Group, are largely incorporated outside the UK, including in the UAE, where comparable public ownership-verification filings were not accessible for this research.
Sources
- Companies House – Persons with Significant Control, Gulf Marine Services (UK) Limited (SC395183)
- Companies House – Company overview, Gulf Marine Services PLC (08860816)
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Frequently Asked Questions
What does Gulf Marine Services PLC do?
Operator of self-propelled, self-elevating support vessels (SESVs) for offshore oil, gas and renewable energy industries, incorporated in England and Wales but operationally based in Abu Dhabi, UAE.
Who owns Gulf Marine Services PLC?
Major shareholders only (DTR5 disclosures). Largest disclosed holder: MZI Holding Limited, approximately 23.16% as of 8 April 2025. Bank of America Corporation disclosed approximately 6.86% via Merrill Lynch International, 6 May 2026.
Who is Gulf Marine Services PLC's UBO (Ultimate Beneficial Owner)?
No natural-person ultimate beneficial owner officially disclosed; largest shareholder (MZI Holding Limited) is a corporate entity.
Is Gulf Marine Services PLC still an active company?
Gulf Marine Services PLC's status on Ministry of Economy & Tourism — National Economic Register / Emirate-level DEDs is listed as active.
What is Gulf Marine Services PLC's registered address?
The registered address on file for Gulf Marine Services PLC is Abu Dhabi, United Arab Emirates.
What is Gulf Marine Services PLC's revenue?
US$188.1 million consolidated revenue for the financial year ended 31 December 2025, up 12% from US$167.5 million in 2024; Adjusted EBITDA of US$112.9 million.
Is Gulf Marine Services PLC listed on a stock exchange?
London Stock Exchange Main Market, ticker GMS, ISIN GB00BJVWTM27.
Who are the officers/directors of Gulf Marine Services PLC?
Six active officers (five directors, one company secretary) and 24 former officers recorded at UK Companies House.
Does Gulf Marine Services PLC have a parent company or subsidiaries?
Gulf Marine Services PLC is the group's ultimate holding company. One verified direct subsidiary: Gulf Marine Services (UK) Limited (Scotland, SC395183), 75%+ owned since 6 April 2016.
Can Zavia monitor changes to Gulf Marine Services PLC's ownership over time?
This profile reflects a point-in-time snapshot from Ministry of Economy & Tourism — National Economic Register / Emirate-level DEDs. Zavia's monitoring API can track changes to Gulf Marine Services PLC's registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access Gulf Marine Services PLC's data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including United Arab Emirates, so records like Gulf Marine Services PLC's registration, shareholder, UBO, and group-structure data can be queried programmatically instead of viewed one page at a time.
Where does this company information come from, and how current is it?
This record is sourced directly from Ministry of Economy & Tourism — National Economic Register / Emirate-level DEDs and was last synced on 11 August 2026.