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Accounting firm Clifton Gunderson announced its latest merger Friday, with the St. Louis-based firm of Humes & Barrington, expanding its footprint to the Gateway City.

Milwaukee-based accounting firm Clifton Gunderson is acquiring and merging in several other firms as it expands its footprint to several new markets, including Philadelphia, New York and Indiana.

MaloneBailey has merged in local firm John M. Thomas PC, building its presence in the Houston area.

Net@Work, a major New York-based Sage reseller and document management service provider, has acquired Boston-based MAS 90 and MAS 200 reseller Fitzgerald Group, giving the firm a much larger Northeast presence and over 700 new customers.

Texas accounting firm Weaver has merged with Elms Faris, expanding the Forth Worth-based firm to the Midland/Odessa market.

SAP America Inc., the German software maker’s American subsidiary, has signed a definitive agreement to acquire Sybase Inc. in a transaction that will bring the two IT giants together to enable companies to take better advantage of mobile technologies and services.

Grant Thornton LLP has purchased the assets of Dallas-based information technology consulting and software firm Avalion Consulting LLC.

The two chairmen of recently united firms Mazars and Weiser LLP said they anticipate further expansion.

CompuPay has acquired another payroll service company, Priority Payroll.

Intuit Inc. has signed a definitive agreement to acquire Medfusion Inc., a Cary, N.C.-based patient-to-provider communications software developer, for approximately $91 million.

Net@Work, a major New York-based Sage reseller and document management service provider, has acquired Boston-based MAS 90 and MAS 200 reseller Fitzgerald Group, giving the firm a much larger Northeast presence and over 700 new customers.

New York-based Top 100 Firm Weiser LLP announced todaythat it has joined Mazars, an international group specializing in audit andadvisory services.

Accounting firm Marcum LLP plans to expand in the New England area by acquiring three offices from UHY Advisors.

California CPA firm Stonefield Josephson has acquired Caporicci & Larson, expanding the firm’s governmental and nonprofit auditing capabilities.

Wolter Kluwer Law Business has acquired ftwilliam.com, a company that provides online employee benefits software.

CALIFORNIA

LECG Corp. has closed its merger with Smart Business Advisory & Consulting.

Wipfli has reached an agreement to provide accounting, tax and consulting services to clients of American Capital LLC, a Chicago-based firm that specializes in providing tax and succession planning services to high-net-worth individuals and their businesses.

Graf Repetti & Co. has combined with Zeidman, Lackowitz, Prisand & Co., building the firm’s presence on Long Island.