Shoosmiths has advised the selling shareholders and management of TMA, a leading UK-based energy data collection and aggregation business, on a private equity investment from Magnesium Capital.
Published: 4 September 2026
The deal marks a significant milestone for TMA and reflects the growing interest in the data and digital infrastructure underpinning the UK’s energy transition. Magnesium Capital’s acquisition of a majority stake in TMA will support its continued growth throughout the implementation of the Market-wide Half-Hourly Settlement (“MHHS”), a key reform to the industry that places businesses with TMA’s capabilities at the centre of the energy market.
The MHHS reform officially went live for industry migration on 22 October 2025 and has demanded the reshaping of the UK electricity market, now requiring meters across residential and commercial sites to be settled based on consumption data recorded every 30 minutes. The programme is scheduled to complete in spring 2027.
Shoosmiths has previously advised TMA on a range of corporate matters over several years, including its initial MBO and several bolt-on acquisitions and in this deal provided support to TMA, Shareholders and Management across multiple service lines including Corporate, Equity, Tax and Management Incentives.
Lisa Sigalet, Partner in Shoosmiths’ Corporate team, said: “TMA plays a critical role in the GB energy market, and this investment comes at a pivotal moment for the industry with MHHS reshaping data infrastructure demands. The investment positions TMA to build on its reputation as a trusted partner to some of the UK’s leading energy suppliers as the market undergoes this phase of transformation.”
Rob Kitchen, Group Managing Director at TMA, said: “This investment represents an important milestone for TMA and a strong endorsement of the business we have built, the quality of our people and the role we play in supporting the UK energy market. With Magnesium Capital’s backing, we are well placed to continue investing in our technology, services and customer relationships as the industry transitions through MHHS and beyond. Shoosmiths were fantastic throughout the process, providing clear, commercial and pragmatic support from start to finish. Their understanding of our business and the dynamics of the deal made them a valued partner at every stage.”
The Shoosmiths team advising on the acquisition was led by Corporate Partner Lisa Sigalet and supported by Senior Associate Charlotte Constantinides and Associate Kerry Coomer. Equity advice was provided by Partners Holly Hirst and Alison Chivers, and Associate Jake Bowdler. Incentives advice was provided by Partner Dan Sharman and Principal Associate Marie Mann and Tax support was provided by Partner Laura Board, Principal Associate Caroline Airey, Senior Associate Carly Cutler and Associate Pritpal Virdee. Employment advice was provided by Partner Stuart Lawrenson and Associates Charlotte Gamblin and Ashlie Cheshire.