RSM UK Holdings Limited and RSM US LLP have announced that they will join forces through a new transatlantic partnership, effective January 1, 2026. Partners of both firms have cast near-unanimous votes in favour of the new partnership structure.
Under the new structure, 23,000 professionals will operate across the UK, the US, Canada, Ireland, India, and El Salvador, generating aggregate annual revenues of $5 billion (USD).
Rob Donaldson, RSM UK CEO, said: “This announcement reflects a continuation of the transformation of the RSM business in the UK over the last five years. We have been on a journey to become a more effective competitor to the largest players in the UK market whilst enhancing our ability to support our RSM network partners globally. This next step marks a defining moment in the journey of our firms on both sides of the Atlantic. In today’s rapidly evolving market, our new partnership helps us make quicker, bolder decisions and investments to serve clients around the world.”
The firms will continue to be independent members of the RSM International network.
Pictured: Rob Donaldson (left) and Brian Becker (right) – RSM UK and RSM US CEOs, respectively.



