Five9 is a call center software company that has raised $8.6 million in equity funding from private equity firm Adams Street Partners. Other investors that participated in this round include Winblad and Partech International. Five9 has tripled their revenues and customers in about three years. Five9 has raised a total of $37 million thus far.

Australians Guy King and Bevan Clark launched RetailMeNot.com in 2007 at a cost of about $30. Recently the two have sold RetailMeNot.com for $90 million to WhaleShark Media. With about 95 million unique visitors per year, RetailMeNot.com is the most visited coupon website in the world.

IAC/InterActiveCorp (NASDAQ:IACI)’s Ticketmaster stated yesterday that they would acquire TicketsNow for $265 million.  TicketsNow is a website where consumers can buy tickets for events such as the NFL Playoffs, Hannah Montana, and musicals.

eBay also was rumored to be looking into the acquisition of TicketsNow.  But eBay also recently acquired StubHub for $310 million.  TicketsNow’s first round of funding was $8 million around the middle of 2006 from DFJ, Portage Venture Partners, and New World Ventures.  Then the $8 million turned into equity as the company raised $35 million last year, led by Adam Street Partners.

As Ticketmaster’s contract with concert promotion company, Live Nation Inc. ended recently, Ticketmaster wanted to seek additional revenue streams.  Live Nation is starting their own box office for ticket sales.  Live Nation was a previous subsidiary of Clear Channel Communications.