MERGERS AND ACQUISITIONS

Union Bankshares Corp., a Bowling Green-based community bank, agreed to buy Prosperity Bank & Trust Co. in Springfield for about $36 million. Sandler O'Neill & Partners LP advised Prosperity Bank on the transaction. Prosperity has three branches and $128 million in assets.

PRIVATE EQUITY

Trust Digital, a McLean maker of mobile security software, raised $9 million from selling Series B preferred stock to BCE Capital Inc., Core Capital of the District and Avansis Ventures of Reston.

Metastorm Inc., a Columbia business software firm, sold $5.2 million in Series BB preferred stock to four investors, according to a Securities and Exchange Commission filing. The money will be used for working capital and to acquire another business. Investors include ICG Holdings Inc. of Newark, Del., Wall Street Technology Partners LP of New York, Axiom Venture Partners LP of Connecticut, and Mayflower LP of Britain.

Backfence Inc., a Falls Church company that maintains local news and advertising Web sites, raised $3 million in a Series A financing from seven investors, according to an SEC filing. Investors include Silicon Alley Seed Investors of New York and Omidyar Network of California. Individual investors included Edward H. Bersoff, former chief executive of BTG Inc.; Frank A. Bonsal Jr., co-founder of New Enterprise Associates; and John Burton, general partner of venture firm Updata.

Get Well Network Inc., a Bethesda developer of patient communication systems for hospitals, sold $3.7 million of Series A preferred stock to 17 investors, according to an SEC filing. Investors include Point Judith Venture Fund LP of Rhode Island and Grosvenor Special Ventures LP of the District.

Cernium Inc., a Reston provider of video surveillance systems, closed its Series D funding round with a $7.5 million investment led by Lurie Investments Inc. of Chicago.

PUBLIC EQUITY

Republic Property Trust, a District real estate investment trust formed by Republic Properties Corp., filed to raise $345 million in a public stock offering. The trust's initial properties will be in Washington and the suburbs, about a quarter of which are leased by the U.S. government. The offering is being underwritten by Lehman Brothers and Bear, Stearns & Co.

InforMedix Holdings Inc., a Rockville company that sells systems for monitoring patient medications, said it closed on the sale of $650,000 of convertible debt and agreed to equity financing of up to $4 million from an unidentified private equity fund.

Compiled by Terence O'Hara and Bloomberg News.