Company: Cellular Dynamics International
Based: Madison, WI
Investors: Tactics II Stem Cell Ventures, Sam Zell's Equity Group Investments and Sixth Floor Investors
Scoop: A 2008 Fierce 15 member, Cellular Dynamics added $40.6 million in Series B financing to grow its stem cell production. The company is the world's highest volume manufacturer of human heart cells and plans to use the added funds to enter other markets.