Simon Williams

Simon Williams has been chief executive of Trustmarque since March 2023 and of the merged Trustmarque Ultima since the deal completed in November 2025. He came from NTT DATA, where he ran the UK and Ireland business, and before that held consulting roles at Capgemini and Detica. When Trustmarque hired him, he said its ambition was to double in size. The merger is how he plans to get there.

Two businesses, one balance sheet

Trustmarque, founded in York in 1987 and owned by One Equity Partners since 2022, and Ultima, founded in Reading in 1990 and backed by Apse Capital since 2019, completed their merger on 3 November 2025. The combined group has more than 1,000 staff and more than 3,000 customers, and works with Microsoft, Cisco, IBM, HPE and Palo Alto among others. At completion it said it was targeting growth in gross invoiced income to more than £1bn. IT Channel Oxygen reported in May that the two businesses had combined pro-forma gross sales of £742m, enough to rank sixth in its Oxygen 250 list.

Williams told the outlet in September that the business is split evenly between reselling and managed services, and between the public sector and corporate customers. He said the Cisco business grew 93% in Cisco’s financial year to 25 July 2026, and that the group is moving 19 HR systems onto one platform.

A new name

On 17 September the group unveiled a single brand, TMU, at its Fusion Live event in London in front of more than 600 customers. “This brand is a clear expression of the business we have become,” Williams said. The Livingstone, Just After Midnight and Acutest sub-brands keep their own managing directors.

Asked by IT Channel Oxygen about growth, Williams pointed to cross-selling across the combined group, and said of hyperscale data center work: “It’s not a market we play in.”

Why it matters to the channel

The merger created one of the largest independent integrators in the UK, with a mix of reselling, managed services and public-sector work that few rivals of its size share. For vendors, it concentrates two partner relationships into one with more buying power. For private equity investors in the UK channel, it shows one way to build scale: merge two mid-sized businesses into a single platform.

Williams has done the deal and the rebrand on schedule, and has given the combined business one name and a £1bn target.