Stephen FoleyJun 18, 2026 – 4.14pmNew York | RSM, the fifth-biggest accounting firm in the US, is expanding its trans-Atlantic partnership as it battles with mid-size rivals flush with cash from private equity.The addition of Mexico to RSM’s alliance alongside the UK, Ireland and Canada was announced to partners this week. The move is one of a series of reforms designed to integrate the firms inside RSM’s global network more tightly, as rivals such as Grant Thornton take money from financial investors to pursue their own international consolidation plans.Subscribe to gift this articleGift 5 articles to anyone you choose each month when you subscribe.Subscribe nowAlready a subscriber? Fetching latest articles