Just two technology firms have held initial public offerings this year: "smart grid" energy company SilverSpringNetworks Inc. last week and social network Professional Diversity Network LLC the week before.
Smart grid company SilverSpringNetworks, which set the terms of its IPO earlier this week, is the latest clean-tech company aiming to provide a jolt to the industry.
In new public offerings, SilverSpringNetworks, which operates a hardware and software network designed to help utility companies create what is known as a "smart grid, " surged on its listing on the New York Stock Exchange.