Ancestry.com, a Provo, Utah-based online resource for family history, has filed for a $75 million IPO. It plans to trade on the Nasdaq or NYSE under ticker symbol “ACOM,” with Morgan Stanley and BoA Merrill Lynch serving as co-lead underwriters. Shareholders include Spectrum Equity Investors (67 percent), Crosslink Capital (6.2 percent)and W Capital Partners (6.1 percent).

Apax Partners has sold its remaining 14.2 percent stake in Germany’s Dialog Semiconductor PLC, via a placement of approximately 6.54 million shares with institutional investors. Apax had originally acquired the company in 1998. Jefferies International Ltd. served as placement agent.

Avago Technologies Ltd., a Singapore-based chipmaker, raised $648 million in an IPO on the Nasdaq (AVGO). The company priced 43.2 million common shares at $15 per share, compared to its original plan to offer 36 million shares at between $13 and $15 a piece. Its initial market cap is approximately $3.54 billion. Avago is the former semiconductor unit of Agilent Technologies, which was acquired by Kohlberg Kravis Roberts & Co. and Silver Lake Partners in 2005 for approximately $2.66 billion.

Catalyst Investors has sold Aplus.net to Hostopia.com Inc., a unit of Deluxe Corp. (NYSE: DLX). No financial terms were disclosed. Aplus was acquired by Catalyst Investors in late 2006, and is a San Diego-based provider of website presence solutions.

Emdeon Inc., a Nashville, Tenn.-based provider of healthcare billing services, has raised $365.7 million in its IPO. The company priced its shares at $15.50 (top of its range), and increased the number of shares offered by 10 percent. It will trade on the NYSE under ticker symbol EM. Shareholders include General Atlantic and Hellman & Friedman.

InfrastruX Group Inc., a Bellevue, Wash.-based provider of utility infrastructure construction and maintenance services, has filed for a $290 million IPO. It plans to trade on the NYSE under ticker symbol IFR, with Credit Suisse and UBS serving as co-lead underwriters. The company is owned by Tenaska Power Fund, and generated $827 million in 2008 revenue.

Omstead Foods, a Canadian portfolio company of TriWest Capital Partners, has sold its appetizer division to Cavendish Farms. No financial terms were disclosed for the deal, which includes processing equipment at the unit’s Wheatley, Ontario, plant and a lease on the facility.

RailAmerica Inc., a Jacksonville, Fla.-based short line and regional rail service provider, has filed for a $300 million IPO. It plans to trade on the NYSE under ticker symbol RA, with JPMorgan, Citi, Deutsche Bank and Morgan Stanley serving as underwriters. Fortress Investment Group took the company private in 2007 for $1.1 billion, including $450 million in equity.

Rosetta Stone Inc. (NYSE: RST), a maker of language-learning software, has filed to sell 4.085 million shares via a secondary public offering. Selling shareholders are ABS Capital Partners and Norwest Equity Partners. If the offering is successful, ABS would cut its ownership stake from 25.1 percent to 11.4 percent, while Norwest would cut from 16.4 percent to 7.4 percent. Rosetta Stone raised $112.5 million via an IPO this past April at $18 per share, and closed trading yesterday at $28.89 per share.

Summit Business Media, a portfolio company of Wind Point Partners, has sold contemporary art fair Art Miami to the annual event’s organizers. No financial terms were disclosed.

TPG Capital has completed its sale of Midwest Airlines to Republic Airways Holdings Inc. (Nasdaq: RJET). The deal included $6 million in cash and a $25 million note that is convertible to Republic stock at $10 per share.

Unity Media, a German cable television and broadband service provider, reportedly is planning to go public later this year. The company has retained Morgan Stanley and UBS as co-lead arrangers, and hopes to raise upwards of $1.4 billion. Apollo Management and BC Partners are Unity Media’s controlling shareholders.

Veritas Capital is planning to sell 10 million shares of DynCorp International Inc. (NYSE: DCP), via a secondary offering. The sale would reduce Veritas’ ownership stake from 55.4 percent to 37 percent. DynCorp stock closed yesterday at $21.43 per share.

Vought Aircraft Industries Inc., a Dallas-based portfolio company of The Carlyle Group, has sold its South Carolina facility to a subsidiary of The Boeing Co. The deal was valued at approximately $580 million.

WestView Capital Partners has sold Radiac Abrasives to Austria’s Tyrolit Schleifmittelwerke Swarovski KG, for an undisclosed amount. Radiac is a Salem, Ill.-based maker of bonded abrasives and super-abrasive grinding wheels.