California: Five9, an on-demand call center solutions company, today announced the completion of $12 million in equity funding from leading investors Hummer Winblad Venture Partners, Partech International and Mosaic Venture Partners. Five9 will use the funding to accelerate its sales, marketing, and product development initiatives.

Five9's leadership in delivering world-class virtual call centers spans customers on five continents in many industry sectors. Five9 offers companies software features, services, and training to become operational in as little as 72 hours.

"This additional funding will enable us to continue to accelerate our sales growth," said Mike Burkland, CEO of Five9.

"Five9 has built a large installed base of customers with its history of award-winning technology backed by superior service. The company has demonstrated high sales growth and sustained leadership in the Software as a Service (SaaS) category. We look forward to continuing growth in the exciting market of on demand call centers," said Mitchell Kertzman, Managing Director of Hummer Winblad Venture Partners and Board Member of Five9.

The on-demand Five9 Virtual Call Center enables companies to build a comprehensive, feature-rich contact center without any hardware, software, or upfront capital expenditures.