Michigan-based accounting and consulting firm Plante Moran has announced that it has acquired Boston-based accounting and advisory firm, Tonneson + Co, effective July 1, 2025. This strategic combination marks a significant milestone in Plante Moran’s continued expansion along the East Coast and affirms both firms’ commitment to their clients and staff.
Among the largest 25 accounting firms in Boston, Tonneson + Co has a storied 50-year history providing expert audit, tax and advisory services. With a dedicated team of more than 100 professionals and a service footprint that spans multiple industries and international markets, the firm has built its reputation on a client-first philosophy.
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