Private company valuations for security companies are up, but venture investors remain excited about putting to money to work. There is no secret why. Governments and corporations are under attack from cyber hacks, and IT budgets are being freed up for products and services to strengthened digital defenses.

Cloud-based enterprise performance management provider Host Analytics has closed $17 million in Series D venture financing. The round was fully financed by the company’s existing investors Advanced Technology Ventures, Trident Capital, StarVest Partners and Next World Capital.

I took a look at the 17 venture-backed companies that have either conducted IPOs since mid May or filed for intended offerings. Here are the investors holding major stakes in the most deals.

Englewood, Colorado-based IHS, a source of information and analysis, has acquired Invention Machine for approximately $40 million. Trident Capital is an investor in Invention Machine. PRESS RELEASE IHS Inc., the leading global source of information and analysis, has acquired Invention Machine for approximately $40 million. Invention Machine is a leader in semantic search technology that [...]

Trident Capital said Gustavo Alberelli has joined the firm as a managing director focusing on late-stage and growth equity investments.  Alberelli was previously at Kennet Partners, where he led growth equity investments in technology companies, typically as the first institutional investor. PRESS RELEASE Trident Capital Appoints Gustavo Alberelli as Managing Director Late-Stage, Growth Equity Experience [...]

Brazil’s Cielo, the country’s largest credit and debit card operator, said on Monday it will buy U.S. payment solutions provider Merchant e-Solutions for $670 million to enable it to settle more online transactions. MeS, as the Redwood City, California-based company is known, specializes in settling e-commerce and mobile payments and annually processes more than $14 billion [...]

Solar energy project company Salamon Group‘s Sunlogics Power Fund has appointed Jay Bingle as president. Mr. Bingle has served as an advisor to and director of numerous companies and venture capital firms, including NEC, Longworth Ventures, NSI, Dentsu, m-Qube, Trident Capital, NewSight Corp, Wired Assets Inc, and Viryd Technologies. PRESS RELEASE SALAMON GROUP, INC. announces [...]

The enthusiasm is evident at Greylock Partners, which has made security investing a greater priority for the firm this year, says Partner Asheem Chandna.

San Francisco-based Extole, maker of a consumer-to-consumer social marketing platform, has raised $10 million in Series C financing, bringing the company’s total raised to $22 million. Shasta Ventures led the round, with participation from existing investors Norwest Venture Partners, Redpoint Ventures, and Trident Capital. PRESS RELEASE Extole (www.extole.com), the leading Consumer-to-Consumer (C2C) Social Marketing Platform, [...]

Trident Capital, a venture capital firm focusing on software, Internet and business services companies, has promoted Matthew Chagan to principal of the firm. Chagan was previously a vice president of Trident. He will continue to focus on investments primarily in the Internet and mobile sectors. PRESS RELEASE Trident Capital, a leading venture capital firm focusing [...]