Trending on peHUB this week: Splunk, Infoblox, Proofpoint, Sequoia Capital, Sevin Rosen, Mohr Davidow, Thrivent, Spectrum Equity, SurveyMonkey, New Mountain Capital, UTIMCO, Union Square Ventures, True Ventures, King.com

Big data software maker Splunk floated shares at $17 this morning, and they are presently trading at $32.01, an 88.3% rise. The San Francisco company priced them above its anticipated $11 to $13 range and raised $229.5 million.

Forget Facebook. The fate of the IPO market this week could depend on the public offerings of three lower profile enterprise companies backed by venture firms: Splunk, Infoblox and Proofpoint.

The market for venture-backed IPOs has been pretty dead so far this year. But based on new filing activity, it looks like there’s some optimism things will improve. At least six venture-backed companies have filed to go public since the start of the year, in sectors ranging from enterprise software to semiconductors to car rentals. [...]

Infoblox, a Santa Clara, Calif.-based provider of realt-time network infrastructure solutions, has acquired Netcordia Inc., an Annapolis, Md.-based provider of network change and configuration management solutions. No financial terms were disclosed.

Infoblox has raised over $75 million in VC funding from Focus Ventures, Chess Ventures, Duchossois Technology Partners, Sequoia Capital, Open Prairie Ventures and Tenaya Capital. Netcordia has raised over $17 million from firms that include Novak Biddle Venture Partners and Trinity Ventures.