Boston-based accounting and advisory firm Tonneson + Co will join Plante Moran, an audit, tax, consulting and wealth management firm, effective July 1, 2025. This combination marks a milestone in Plante Moran’s continued expansion along the east coast.
“We’re excited to join forces with Plante Moran — a 100-year-old, staunchly independent firm known for its award-winning culture,” Rick Mastrocola, CEO of Tonneson, said. “This partnership allows our combined firms to further enhance the capabilities we offer both clients and staff while preserving the unique culture and relationships that have defined Tonneson and Plante Moran for decades.”
“For 100 years, Plante Moran has prioritized long-term stability and client success, which has fueled the firm’s steady growth,” Jason Drake, managing partner of Plante Moran, said. “Tonneson’s shared values and vision for the future make them an ideal partner. We’re excited to welcome their talented team and expand our presence in Boston.”
