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V O L . X X X I N O. X I I I J U N E 1 6 , 2 0 2 5 26 T H E L I S T Maine's largest accounting firms Ranked by 2024 revenue Key services 1 2 3 Staff augmentation 4 5 6 IT consulting 7 8 9 Wealth management Audit Firm BerryDunn 2211 Congress St., Portland 04102 541-2200 • berrydunn.com Baker Newman Noyes 280 Fore St., Portland 04101 879-2100 • bnncpa.com Wipfli LLP 30 Long Creek Drive, South Portland 04106 774-5701 Albin, Randall & Bennett 130 Middle St., Portland 04101 772-1981 • arbcpa.com Purdy Powers & Co. 130 Middle St., 4th Floor, Portland 04101 775-3496 • purdypowers.com CBIZ 7 1 Canal Plaza, 4th Floor, Portland 04101 352-7600 • cbiz.com Otis Atwell 324 Gannett Drive, South Portland 04106 780-1100 • otisatwell.com One River CPAs 46 First Park Drive, Oakland 04963 873-1603 • onerivercpas.com Ouellette & Associates PA 1111 Lisbon St., Lewiston 04240 786-0328 • oacpas.net 10 Swanson Group LLC 838 Main St., Westbrook 04092 370-3490 • yourmainecpa.com 11 Austin Associates PA 8 Two Great Falls Plaza, 5th Floor, Auburn 04210 783-9111 • austinpa.com Maine-based revenue (000,000) 1 $107.2 2 $36.2 $18.7 3 $16.8 $9.9 $9.2 $7.9 $5.8 $5.7 $4.8 $4.5 Maine CPAs/ Maine partners/ Maine staff 55 43 370 51 24 138 25 9 64 30 10 71 17 7 47 12 8 29 16 5 29 14 4 29 11 6 24 8 1 30 12 5 34 Maine offices 2 1 2 1 1 2 1 3 1 1 3 Tax planning & preparation Trusts & estates Business advisory Bookkeeping Head of firm/ year founded Sarah L. Belliveau president & CEO 1974 Darren Hurlburt president & CFO 1995 Robert P. Dube Jr. 4 Christian A. Smith 5 partners 1930 Cheri Walker managing partner 1989 David Shorette managing shareholder 1991 Kirk J. Purvis 1987 Bridget Sylvester managing partner 1974 Alison Lorenz president 1994 Mark R. Carrier president 1979 Tabitha Curit Swanson CEO 2011 Philip J. Doucette managing partner 1950 m via survey 1 Re vailable at press time 2 F 3 F y 31, 2024 4 Lead partner, Augusta 5 Lead partner, South Portland 6 Cleveland-based CBIZ acquired Marcum LLP in November 2024. 7 Ser views and compilations. -This list was compiled by Stephanie R. Meagher and published in the June 16, 2025, issue of Mainebiz. 6 C O M P I L E D B Y S T E P H A N I E M E A G H E R C O M P I L E D B Y S T E P H A N I E M E A G H E R S PONS OR ED BY SUBMIT YOUR NOMINATIONS BY AUGUST 4 AT MAINEBIZ .BIZ/NOMINATIONS Nominate an outstanding young Maine leader today! Mainebiz seeks to honor the young professional and rising stars of Maine's business community for our 40 Under 40 Awards. 1 Revenue as of Dec. 31, 2024 or most recent fiscal year for which data is available at press time 2 For fiscal year ended June 30, 2024 3 For fiscal year ended May 31, 2024 4 Lead partner, Augusta 5 Lead partner, South Portland 6 Laura Everett is expected to succeed Walker on July 1. 7 Cleveland-based CBIZ acquired Marcum LLP in November 2024. 8 Services include financial statement reviews and compilations. S O U R C E : Each firm via survey Purchase this list and more as an Excel document at mainebiz.biz/DataCenter @ Maine's largest accounting firms Ranked by 2024 revenue KEY SERVICES KEY SERVICES