Top 60 accounting firm Grassi has expanded its New York City presence and its tax practice after adding CPA firm Hoffman Mulligan, effective Aug. 1.
Financial terms of the deal weren’t disclosed. The Hoffman Mulligan team, including partners Don Hoffman and Janet Mulligan, along with 20 professionals, has relocated to Grassi’s New York City headquarters on Madison Avenue.
This is Grassi’s first M&A deal in 2026. Its last addition was Denver-based OnePoint Franchise Accounting last November.
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Grassi says the addition of Hoffman Mulligan enhances its ability to serve high-net-worth individuals and closely held businesses with specialized tax advisory and planning solutions.
“Hoffman Mulligan brings a strong reputation for client service and deep technical expertise that closely aligns with our approach,” Louis Grassi, founder and CEO of Grassi, said in a statement on Aug. 13. “This is a strategic step to further expand our capabilities and presence in New York City. As an independent, employee-owned firm, we remain focused on building long-term relationships and delivering thoughtful, forward-looking advice.”
With a more than 45-year history, Hoffman Mulligan grew out of a predecessor firm, Tanton & Co., after Donald Hoffman and Janet Mulligan assumed leadership in 2013. It’s a full-service tax, accounting, and business consulting firm that serves a diverse clientele of individuals, families, and entrepreneurs.
Grassi says the integration reflects the firm’s ongoing commitment to organic growth and strategic expansion by investing in talent while maintaining its independence and high-touch client service model.
Photo credit: Grassi
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