Fast-growing New York CPA firm O’Connor Davies has merged in Flackman, Goodman & Potter, a New Jersey-based accounting firm that specializes in transaction advisory services for private equity funds.

CliftonLarsonAllen has merged in four more firms—Four Point Partners, Guthoff Mehall Allen & Company, Komisar Brady & Co. LLP, and Galanti & Company P.C.—with all the deals effective Jan. 1, 2016.

Illinois-based accounting and consulting firm CDH has merged in the consulting firm Heath Corporation, effective Dec. 1, 2015.

Central Florida CPA firm Averett Warmus Durkee, has joined WithumSmith+Brown, PC, effective Dec. 31, 2015.

Business software provider Open Systems announced that Auburn, Ala.-based SouthWare Innovations will join the company.

Top 100 firm Friedman LLP has combined forces with Philadelphia-based accounting firm, Shechtman Marks Devor PC, effective Jan. 1, 2016.

Columbus-based GBQ Partners has acquired Cincinnati-based Ernst & Rabe, effective January 1, according to published reports.

Top 100 Firm Squar Milner LLP announced that it will expand its presence in San Diego by merging with McLean, Rotherham & Co. and its subsidiary, Hosaka, Rotherham & Co., effective Feb. 1, 2016.

Ohio accounting firm Whalen & Co. CPAs has acquired Hilliard-based firm Earman and Wood CPAs.

Cincinnati-based Barnes Dennig has expanded its tri-state footprint by combining with Indianapolis-based Gauthier & Kimmerling, effective Jan. 1, 2016.