COSTAIN GROUP PLC
COSTAIN GROUP PLC is a public limited company registered in England and Wales under company number 01393773, according to Companies House. It was incorporated on 12 October 1978 as Trushelfco (No. 192) Limited, adopting its current name before the end of that year, and its registered office is at Seventh Floor, 70 St Mary Axe, London, EC3A 8BE. The company is recorded with an “Active” status.
Companies House classifies COSTAIN GROUP PLC’s activities under UK Standard Industrial Classification codes 42110 (construction of roads and motorways), 70100 (activities of head offices) and 71129 (other engineering activities). The company is the parent of the Costain group, a UK infrastructure solutions provider operating through two divisions: Natural Resources, covering water, energy, defence and nuclear markets, and Transportation, covering road, rail and integrated transport projects. In 2025 the group was awarded a contract worth up to £1 billion by Sellafield Ltd for nuclear decommissioning work, one of its largest single awards.
COSTAIN GROUP PLC’s ordinary shares trade on the London Stock Exchange’s main market under the ticker COST (ISIN GB00B64NSP76), and the company rejoined the FTSE 250 index in 2026. For the year ended 31 December 2025, the group reported revenue of £1,045.7 million, down from £1,251.1 million in 2024, alongside adjusted operating profit of £47.1 million and an adjusted operating margin of 4.5%. Its forward work position stood at a record £7.0 billion at that date, reported 10 March 2026.
- Company fundamentals
- Corporate linkage & group structures
- Digitized company financials
- Firmographics — websites, social profiles, revenue and employee estimates
Shareholders
5
Shareholders of COSTAIN GROUP PLC
COSTAIN GROUP PLC is a public limited company whose ordinary shares are admitted to trading on the London Stock Exchange’s main market (ticker COST, ISIN GB00B64NSP76); as of 30 June 2026 its issued share capital comprised 266,129,025 ordinary shares of 1p each, each carrying one vote, with no shares held in treasury. Because it has voting shares admitted to trading on a UK regulated market, the company has been exempt from Companies House’s Persons with Significant Control disclosure regime since 20 February 2018, and instead discloses major shareholdings under the UK’s Disclosure Guidance and Transparency Rules (DTR5), which require notification once a holding crosses 3% of voting rights and at subsequent whole-percentage thresholds. The largest disclosed holder is FIL Limited (Fidelity), registered in Hamilton, Bermuda, which notified an increased holding of 10.2064% of voting rights on 9 September 2026 (threshold crossed 8 September 2026), comprising 9.4101% held directly (24,740,707 shares) and 0.7963% via contracts for difference (2,093,679 shares). UBS Group AG had earlier notified a holding of 5.221284% of voting rights as of 17 April 2025. No other current substantial-shareholding notification was identified. These figures represent point-in-time regulatory notifications rather than a complete, continuously updated shareholder register.
Data availability
Classification: Major shareholders only. Companies House confirms COSTAIN GROUP PLC’s exemption from Persons with Significant Control reporting on account of its listing, and regulatory disclosures under DTR5 identify holders that have crossed the 3% notification threshold, but the complete shareholder register, including holdings below that threshold and shares held through nominee and custodian accounts, is not publicly available.
Sources
- Companies House – Persons with Significant Control, company number 01393773 (retrieved 10 September 2026)
- Companies House – Company overview, company number 01393773 (retrieved 10 September 2026)
- Regulatory News Service via Investegate – FIL Limited, Holding(s) in Company, Costain Group PLC (published 9 September 2026)
- Regulatory News Service via Investegate – Costain Group PLC, Total Voting Rights (as at 30 June 2026)
- London Stock Exchange – Costain Group PLC (COST) company page (retrieved 10 September 2026)
Registry feed — rows exactly as filed with Companies House, including entries the profile above does not cover.
| Shareholder | Type | Holding | Source Document |
|---|---|---|---|
| HSBC CLIENT HOLDINGS NOMINEE (UK) LTD | 22.4% | Companies House | |
| YORK PLACE LTD & COMMEZ BANK A.G. | 22.1% | Companies House | |
| BBHISL NOMINEES LTD | 22% | Companies House | |
| Northern Multi-Manager Global Listed Infrastructure Fd | 2% | Companies House | |
| DFA INVESTMENT DIMENSIONS GROUP INC-Intl Core Eqy. 2 PORT. | 0.5% | Companies House |
Officers
72
Directors and officers of COSTAIN GROUP PLC
Companies House records 76 officer appointments in COSTAIN GROUP PLC’s history since 1978, of which 8 are currently active (7 directors and 1 company secretary) and 68 have resigned. The current directors are Alexander John Vaughan (Director since 7 May 2019), Helen Margaret Willis (Director since 30 November 2020), Anthony James Quinlan (Director since 1 February 2021), Fiona Margaret Barkham (Director since 6 April 2022), Kate Harriet Alexandra Rock, Baroness Rock (Director since 1 November 2022), Steven Lewis Mogford (Director since 1 November 2023) and Amanda Lucia Fisher (Director since 1 December 2023). Nicole Ann Geoghegan has served as Company Secretary since 5 July 2022. All current directors are recorded with British nationality and are resident in England or elsewhere in the United Kingdom, and all active officers share a single correspondence address at the company’s registered office, Seventh Floor, 70 St Mary Axe, London, EC3A 8BE. This overview reflects Companies House officer data retrieved 10 September 2026.
Data availability
Classification: Full. Companies House publishes current and historical director and secretary appointment dates for COSTAIN GROUP PLC together with nationality and country of residence as separately disclosed fields for each current individual officer. Occupation, as distinct from legal role, is not separately reported for these officers, and the correspondence address on file for all current officers is the company’s registered office rather than a personal address. No officer appointment, resignation or role change dated within the past twelve months was identified in the available filings.
Sources
- Companies House – Officers list, company number 01393773 (retrieved 10 September 2026)
- Companies House – Filing history, company number 01393773 (retrieved 10 September 2026)
Registry feed — rows exactly as filed with Companies House, including entries the profile above does not cover.
Group Structure
Group structure of COSTAIN GROUP PLC
COSTAIN GROUP PLC is the ultimate parent company of the Costain group; no corporate parent was identified in Companies House filings, consistent with its status as a company whose shares are admitted to trading on the London Stock Exchange. Companies House’s Persons with Significant Control filings for individual UK subsidiaries confirm that COSTAIN GROUP PLC directly controls Costain Civil Engineering Limited (company number 02757907) and Costain Engineering & Construction Limited (company number 02440829), and indirectly controls Costain Limited (company number 00610201) through Costain Civil Engineering Limited, in each case since 6 April 2016. Zavia’s internal corporate-linkage data lists a substantially larger network of UK and overseas entities operating under the Costain name, including companies registered in Nigeria, Zimbabwe, Spain and the Bahamas, but these additional relationships could not be independently confirmed against current Companies House Persons with Significant Control filings within this review and are omitted here as unverified. This overview reflects Companies House filings reviewed 10 September 2026.
Verified corporate relationships
| Entity | Country | Registration number | Relationship | Ownership | Status | Information date |
|---|---|---|---|---|---|---|
| Costain Civil Engineering Limited | United Kingdom | 02757907 | Direct subsidiary | 75% or more of shares and voting rights | Active | 6 April 2016 |
| Costain Engineering & Construction Limited | United Kingdom | 02440829 | Direct subsidiary | 75% or more of shares and voting rights | Active | 6 April 2016 |
| Costain Limited | United Kingdom | 00610201 | Indirect subsidiary (via Costain Civil Engineering Limited) | 75% or more of shares and voting rights | Active | 6 April 2016 |
Data availability
Classification: Subsidiaries only. Companies House Persons with Significant Control filings confirm COSTAIN GROUP PLC’s direct and indirect control of several named UK subsidiaries, but the company’s own filings do not identify any corporate parent, and a complete list of all group subsidiaries, including non-UK entities, was not independently verified from official sources within this review.
Sources
- Companies House – Persons with Significant Control, company number 02757907 (retrieved 10 September 2026)
- Companies House – Persons with Significant Control, company number 02440829 (retrieved 10 September 2026)
- Companies House – Persons with Significant Control, company number 00610201 (retrieved 10 September 2026)
- Companies House – Company overview, company number 01393773 (retrieved 10 September 2026)
Registry feed — rows exactly as filed with Companies House, including entries the profile above does not cover.
COSTAIN GROUP PLC
United Kingdom
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Frequently Asked Questions
What does COSTAIN GROUP PLC do?
COSTAIN GROUP PLC (company number 01393773) is a public limited company registered in England and Wales, incorporated 12 October 1978, and is the parent company of the Costain infrastructure group, which operates through Natural Resources (water, energy, defence, nuclear) and Transportation (road, rail) divisions.
Who owns COSTAIN GROUP PLC?
COSTAIN GROUP PLC is exempt from Companies House’s Persons with Significant Control regime because its shares are admitted to trading on a UK regulated market; the largest disclosed shareholder under FCA transparency rules is FIL Limited, which notified a holding of 10.2064% of voting rights on 9 September 2026.
Who is COSTAIN GROUP PLC's UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for COSTAIN GROUP PLC is itself a company rather than a natural person, so no Ultimate Beneficial Owner (UBO) is identified at this level; establishing one would require tracing the ownership of each shareholding company in turn.
What is COSTAIN GROUP PLC's company registration number?
COSTAIN GROUP PLC's registration number is 01393773, filed with Companies House in United Kingdom. Its current status on the register is active.
Is COSTAIN GROUP PLC still an active company?
COSTAIN GROUP PLC's status on Companies House is listed as active.
When was COSTAIN GROUP PLC incorporated?
COSTAIN GROUP PLC was incorporated on 12 October 1978, according to Companies House.
What is COSTAIN GROUP PLC's registered address?
The registered address on file for COSTAIN GROUP PLC is London, United Kingdom.
What legal structure is COSTAIN GROUP PLC registered as?
COSTAIN GROUP PLC is registered as a Public Limited Company in United Kingdom.
What is COSTAIN GROUP PLC's revenue?
For the year ended 31 December 2025, COSTAIN GROUP PLC reported Group revenue of £1,045.7 million, down from £1,251.1 million in 2024, with adjusted operating profit of £47.1 million and an adjusted operating margin of 4.5%, as announced 10 March 2026.
Is COSTAIN GROUP PLC listed on a stock exchange?
COSTAIN GROUP PLC’s ordinary shares trade on the London Stock Exchange’s main market under the ticker COST (ISIN GB00B64NSP76), and the company rejoined the FTSE 250 index in 2026.
Who are the officers/directors of COSTAIN GROUP PLC?
Companies House records eight active officers of COSTAIN GROUP PLC as at 10 September 2026, comprising seven directors and one company secretary, out of 76 officer appointments recorded in the company’s history.
Does COSTAIN GROUP PLC have a parent company or subsidiaries?
Companies House Persons with Significant Control filings confirm COSTAIN GROUP PLC directly controls Costain Civil Engineering Limited and Costain Engineering & Construction Limited, and indirectly controls Costain Limited, with no corporate parent identified for COSTAIN GROUP PLC itself.
Can Zavia monitor changes to COSTAIN GROUP PLC's ownership over time?
This profile reflects a point-in-time snapshot from Companies House. Zavia's monitoring API can track changes to COSTAIN GROUP 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 COSTAIN GROUP PLC's data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including United Kingdom, so records like COSTAIN GROUP 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 Companies House and was last synced on 8 September 2026.