QUANTUM DATA ENERGY PLC
QUANTUM DATA ENERGY PLC is a public limited company registered in England and Wales under company number 12886458, according to Companies House. The company was incorporated on 17 September 2020 as Mast Energy Developments Limited, re-registered as a public company on 18 November 2020 as Mast Energy Developments PLC, and changed its name to QUANTUM DATA ENERGY PLC on 3 November 2025. QUANTUM DATA ENERGY PLC is currently recorded with an “Active” status, with its registered office at 6th Floor, 99 Gresham Street, London, EC2V 7NG.
Companies House classifies the company’s principal activity under UK Standard Industrial Classification code 35110, production of electricity. QUANTUM DATA ENERGY PLC develops, owns and operates flexible and reserve gas-powered generation assets in the United Kingdom, including its Pyebridge site (8.1 MW, Derbyshire), Bordersley site (5 MW, Birmingham), Rochdale site (4.4 MW), Hindlip site (7.5 MW, Worcestershire) and Stather site (2.4 MW, Scunthorpe, Lincolnshire). Following its November 2025 rebrand from Mast Energy Developments PLC, the company has described its strategy as evolving from a UK flexible-generation operator toward a “modular, data-integrated power platform” that also targets power supply for AI datacentre campuses, alongside its existing reserve-power business.
QUANTUM DATA ENERGY PLC’s ordinary shares (ISIN GB00BNG90H86) have traded on the Main Market of the London Stock Exchange, under a Standard Listing, since admission on 14 April 2021; the share ticker changed from MAST to QDE with effect from 26 February 2026. For the financial year ended 31 December 2025, the company reported consolidated group revenue of £1,629,410, up 121% on the £737,158 reported for 2024, and a consolidated net loss of £1,518,682, according to its Annual Financial Report published on 5 August 2026. Trading in the company’s shares was temporarily suspended from 1 May 2026 under UK Listing Rule 21.3 after its then auditor, Crowe UK LLP, resigned shortly before the 2025 annual reporting deadline; the company subsequently appointed Parker Russell UK LLP as auditor, published its delayed FY2025 Annual Financial Report together with a Listing Restoration Update on 5 August 2026, and continued to publish periodic announcements, including a half-year financial report, through September 2026.
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Shareholders
Shareholders of QUANTUM DATA ENERGY PLC
QUANTUM DATA ENERGY PLC’s persons-with-significant-control (PSC) register at Companies House shows no currently active PSC entries: since 18 June 2024 the company has been treated as exempt from PSC-register disclosure because its shares are admitted to trading on a UK regulated market (the Main Market of the London Stock Exchange). The most recent disclosed PSC was Kibo Mining (Cyprus) Ltd, a private company registered in Cyprus under registration number HE 247089, recorded as holding “more than 50% but less than 75%” of shares and voting rights and the right to appoint or remove directors, notified 18 November 2020 and ceased 24 May 2024. Separately, contemporary reporting on the company’s April 2021 IPO records that Kibo Energy PLC, the group from which the company was spun out ahead of listing, retained an approximate 55% interest in the company at admission. No complete, current shareholder register is publicly available for a company that is exempt from PSC disclosure on this basis.
Data availability
Classification: Historical. Companies House’s PSC register provides only a historical, banded disclosure (Kibo Mining (Cyprus) Ltd, ceased 24 May 2024) rather than a current shareholder or beneficial-ownership picture, because QUANTUM DATA ENERGY PLC’s listed status exempts it from ongoing PSC filing. No verified natural-person ultimate beneficial owner was identified in the sources reviewed for this profile.
Sources
- Companies House – Persons with Significant Control, company number 12886458 (retrieved 10 September 2026)
- UK Investor Magazine – “Mast Energy Developments set for IPO” (retrieved 10 September 2026)
Officers
8
Directors and officers of QUANTUM DATA ENERGY PLC
Companies House records four active officers for QUANTUM DATA ENERGY PLC and five former officer appointments. The current board comprises three directors – Pieter-Schalk Krugel (appointed 13 July 2022), Paulus Fillippus Venter (appointed 25 March 2021) and Celia Li (appointed 14 July 2025) – together with Noel O’Keeffe as Company Secretary (appointed 14 April 2021, having previously served as a director between 17 September 2020 and 14 April 2021). Two directors, Louis Lodewyk Coetzee and Dominic Traynor, both resigned on 21 November 2024. Nationality and country of residence are disclosed as separate fields for the company’s officers: for example, Krugel is recorded with South African nationality and a United Kingdom country of residence, while Venter and Li are both recorded with British nationality and UK residence. This overview reflects Companies House officer data retrieved 10 September 2026.
Recent officer changes
- Celia Li appointed Director, effective 14 July 2025 (Companies House filing).
- Louis Lodewyk Coetzee resigned as Director, effective 21 November 2024 (Companies House filing).
- Dominic Traynor resigned as Director, effective 21 November 2024 (Companies House filing).
Data availability
Classification: Full. Companies House publishes current and former director and secretary appointment dates, together with nationality and country of residence, as independently reported fields for QUANTUM DATA ENERGY PLC’s natural-person officers rather than inferring one from another; for example, former director Louis Lodewyk Coetzee is recorded with South African nationality and a South Africa country of residence, while former director Dominic Traynor (in his later, 2021–2024 appointment) is recorded with British nationality and an England country of residence. Occupation, as distinct from legal role, is not separately published for these appointments, and the correspondence address on file (6th Floor, 99 Gresham Street, London) is a service address only, not a residential address. No corporate officers are currently recorded for the company.
Sources
- Companies House – Officers list, company number 12886458 (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 QUANTUM DATA ENERGY PLC
QUANTUM DATA ENERGY PLC is not an independent, standalone company: its own reporting describes it as an investment holding company that raises capital for its investee power-generation projects, structured around a directly held subsidiary, Sloane Developments Limited. No current parent company is disclosed for QUANTUM DATA ENERGY PLC: its previous majority shareholder, Kibo Mining (Cyprus) Ltd, ceased to be registered as a person with significant control on 24 May 2024, after the company’s Main Market listing brought it within the PSC exemption for issuers with regulated-market-listed shares. Below Sloane Developments Limited, Companies House’s persons-with-significant-control filings confirm Sloane Developments Limited as the controlling shareholder of Pyebridge Power Ltd (75% or more of shares and voting rights, notified 11 August 2021), making Pyebridge Power Ltd an indirect subsidiary. Sloane Developments Limited also holds a smaller stake, of more than 25% but not more than 50%, in Bordersley Power Ltd, where a separate shareholder, Power Balancing Services Limited, was notified as holding a larger, controlling stake of more than 50% but less than 75% with effect from 6 March 2026; Bordersley Power Ltd is accordingly treated here as an indirect minority interest rather than a controlled subsidiary. This overview reflects Companies House filings reviewed 10 September 2026.
Verified corporate relationships
| Entity | Country | Registration number | Relationship | Ownership | Status | Information date |
|---|---|---|---|---|---|---|
| Sloane Developments Limited | England and Wales | 04425405 | Direct subsidiary | Ownership percentage not disclosed | Active | 10 September 2026 |
| Pyebridge Power Ltd | England and Wales | 13499825 | Indirect subsidiary (via Sloane Developments Limited) | 75% or more of shares and voting rights | Active | 11 August 2021 |
| Bordersley Power Ltd | England and Wales | 11894417 | Affiliate (indirect minority interest via Sloane Developments Limited) | More than 25% but not more than 50% of shares and voting rights | Active | 1 August 2019 |
| Kibo Mining (Cyprus) Ltd | Cyprus | HE 247089 | Historical relationship (former immediate parent) | More than 50% but less than 75% of shares and voting rights | Ceased | 24 May 2024 |
Recent structural changes
- Kibo Mining (Cyprus) Ltd ceased to be registered as the company’s person with significant control on 24 May 2024, following the company’s exemption from PSC disclosure as a listed issuer (Companies House filing).
- Power Balancing Services Limited was notified as a person with significant control of Bordersley Power Ltd, holding more than 50% but less than 75% of shares and voting rights, effective 6 March 2026, reducing Sloane Developments Limited’s relative position in that entity to a minority interest (Companies House filing).
Data availability
Classification: Partial. Companies House filings verify QUANTUM DATA ENERGY PLC’s direct subsidiary, Sloane Developments Limited, and two project-level entities linked through it, but do not disclose an exact ownership percentage for Sloane Developments Limited itself, and no current parent company is disclosed following the company’s PSC exemption as a listed issuer. Other project entities referenced in the company’s own investor materials were not independently confirmed against a primary registry or filing source within the scope of this review and have been omitted from the table above.
Sources
- Companies House – Persons with Significant Control, company number 12886458 (retrieved 10 September 2026)
- Companies House – Persons with Significant Control, company number 13499825 (retrieved 10 September 2026)
- Companies House – Persons with Significant Control, company number 11894417 (retrieved 10 September 2026)
- Companies House – Company overview, company number 04425405 (retrieved 10 September 2026)
Registry feed — rows exactly as filed with Companies House, including entries the profile above does not cover.
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Frequently Asked Questions
What does QUANTUM DATA ENERGY PLC do?
QUANTUM DATA ENERGY PLC (company number 12886458), formerly Mast Energy Developments PLC until 3 November 2025, is a public limited company registered in England and Wales that develops, owns and operates flexible and reserve gas-powered electricity generation assets in the UK under UK SIC code 35110, including sites at Pyebridge, Bordersley, Rochdale, Hindlip and Stather.
Who owns QUANTUM DATA ENERGY PLC?
Companies House’s persons-with-significant-control register shows no currently active PSC for QUANTUM DATA ENERGY PLC, as the company is exempt from PSC disclosure as a listed issuer; the last disclosed PSC, Kibo Mining (Cyprus) Ltd, held more than 50% but less than 75% of shares and voting rights until its entry ceased on 24 May 2024.
Who is QUANTUM DATA ENERGY PLC's UBO (Ultimate Beneficial Owner)?
No Ultimate Beneficial Owner (UBO) data is recorded for QUANTUM DATA ENERGY PLC; access to beneficial-ownership data in this jurisdiction is governed by its own register rules.
What is QUANTUM DATA ENERGY PLC's company registration number?
QUANTUM DATA ENERGY PLC's registration number is 12886458, filed with Companies House in United Kingdom. Its current status on the register is active.
Is QUANTUM DATA ENERGY PLC still an active company?
QUANTUM DATA ENERGY PLC's status on Companies House is listed as active.
When was QUANTUM DATA ENERGY PLC incorporated?
QUANTUM DATA ENERGY PLC was incorporated on 17 September 2020, according to Companies House.
What is QUANTUM DATA ENERGY PLC's registered address?
The registered address on file for QUANTUM DATA ENERGY PLC is London, United Kingdom.
What legal structure is QUANTUM DATA ENERGY PLC registered as?
QUANTUM DATA ENERGY PLC is registered as a Public Limited Company in United Kingdom.
What is QUANTUM DATA ENERGY PLC's revenue?
For the financial year ended 31 December 2025, QUANTUM DATA ENERGY PLC reported consolidated group revenue of £1,629,410, up 121% from £737,158 in 2024, and a consolidated net loss of £1,518,682, according to its Annual Financial Report published 5 August 2026.
Is QUANTUM DATA ENERGY PLC listed on a stock exchange?
QUANTUM DATA ENERGY PLC’s shares (ISIN GB00BNG90H86) have traded on the Main Market of the London Stock Exchange under a Standard Listing since 14 April 2021, with the ticker changing from MAST to QDE effective 26 February 2026; trading was temporarily suspended from 1 May 2026 after the company’s auditor resigned shortly before its annual reporting deadline, before the company published its delayed results and a listing restoration update on 5 August 2026.
Who are the officers/directors of QUANTUM DATA ENERGY PLC?
Companies House records three active directors — Pieter-Schalk Krugel, Paulus Fillippus Venter and Celia Li — and Noel O’Keeffe as Company Secretary for QUANTUM DATA ENERGY PLC, with Louis Lodewyk Coetzee and Dominic Traynor both resigning as directors on 21 November 2024.
Does QUANTUM DATA ENERGY PLC have a parent company or subsidiaries?
QUANTUM DATA ENERGY PLC directly holds Sloane Developments Limited (company number 04425405), which in turn controls Pyebridge Power Ltd (75% or more of shares and voting rights) and holds a minority stake of more than 25% but not more than 50% in Bordersley Power Ltd, per Companies House filings.
Can Zavia monitor changes to QUANTUM DATA ENERGY PLC's ownership over time?
This profile reflects a point-in-time snapshot from Companies House. Zavia's monitoring API can track changes to QUANTUM DATA ENERGY 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 QUANTUM DATA ENERGY 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 QUANTUM DATA ENERGY 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.