New York City
2009 revenue: $25.6 million
Chairman: Matt Blumberg
Develops software that helps large corporations get their e-mail marketing campaigns past spam filters.
Return Path offers a flexible work policy that allows employees to conduct business from home. The company practices open-book management and sends monthly e-mail updates on the company's financial health. Return Path also offers dozens of in-house courses. Employees who have worked at Return Path for seven years can take a six-week paid sabbatical.