Big Technologies plc: Company History, Controversies and Litigation
An independent account of the AIM-listed electronic-monitoring group, from incorporation and the Buddi business through to the litigation, leadership upheaval and financial consequences of 2025–2026.
- 1.Big Technologies plc (AIM: BIG) is the holding company behind the Buddi electronic-monitoring business.
- 2.It was incorporated on 26 May 2017 and admitted to AIM in 2021.
- 3.Since March 2025 it has faced High Court litigation involving its founder and former CEO, a separate Buddi shareholder dispute, and substantial legal expenditure.
- 4.The Buddi shareholder litigation was settled in January 2026 for £38.5 million.
- 5.The company's 2025 audited results reported a £23.015m statutory operating loss and £8.142m of legal costs.
Big Technologies plc ("Big Technologies") is the AIM-listed parent company of the Buddi electronic-monitoring business. Incorporated on 26 May 2017 as a public limited company (company number 10791781), the group was admitted to trading on the London Stock Exchange's Alternative Investment Market (AIM) in 2021 under the ticker BIG.
The group's primary operating brand is Buddi, a provider of electronic-monitoring technology used in the criminal-justice sector. Before the events of 2025, Big Technologies was publicly associated with founder and chief executive Sara Murray and with the growth of the Buddi business in electronic monitoring.
Company profile
| Company | Big Technologies plc |
| Company number | 10791781 |
| Status | Active |
| Company type | Public limited company |
| Incorporated | 26 May 2017 |
| Exchange | London Stock Exchange AIM |
| Ticker | BIG |
| Primary operating brand | Buddi |
| Registered office | Derived from the current Companies House record for company no. 10791781. |
| Source | Companies House |
From incorporation to AIM flotation
Big Technologies was incorporated in 2017 and developed through the Buddi electronic-monitoring business, which serves the criminal-justice market. In 2021 the company completed an admission to AIM, giving the group a public market listing and access to capital-market investors. The admission documents set out the company's business, its governance and the interests of its directors and shareholders at that time.
Subsequent events — described in detail across this investigation — have led Big Technologies to allege that the stated extent of founder Sara Murray's interest in the company at the time of admission was affected by interests or relationships she is said to have failed to disclose. Those allegations are addressed on the IPO Questions page and remain disputed.
The 2025 crisis and its consequences
On 31 March 2025 Big Technologies announced that it had dismissed founder and CEO Sara Murray, terminated her employment and removed her as a director with immediate effect, and that it had commenced proceedings in the High Court. That announcement began a period of corporate turmoil that has since encompassed:
- High Court proceedings between Big Technologies and its former CEO;
- a separate dispute with former Buddi shareholders, settled in January 2026 for £38.5 million;
- substantial legal expenditure recognised in the audited accounts;
- an almost complete turnover of the board; and
- continuing litigation, with mediated discussions ending in September 2026.
Despite the litigation-related charges, the company's underlying operations continued to generate revenue and adjusted EBITDA. The 2025 audited results reported £49.727m of revenue and £24.6m of adjusted EBITDA, against a £23.015m statutory operating loss that reflected settlement and legal-cost provisions. This site records both the adverse developments and the continuing commercial operations.
"A turbulent and consequential year."
— Characterisation attributed to the chair's statement in the 2025 audited results. Read the full analysis on the Turbulent 2025 page.
How to use this investigation
This site separates Established Fact documented facts from Allegation allegations, attributes every claim to its source, and links to the original documents wherever possible. Begin with the timeline, examine the document archive, or compare facts against allegations.
Sources & documents used in this article
- [1] Companies House, company no. 10791781 — company overviewRead original ↗
- [2] Companies House — filing historyRead original ↗
- [3] London Stock Exchange — AIM admission backgroundRead original ↗
- [4] Big Technologies plc, RNS 0042D, 31 March 2025
- [5] Big Technologies plc, Audited Results 2025 (RNS 5284Y), 30 March 2026