4. Jennifer Hyman
Jennifer Hyman co-founded the fashion retail site Rent The Runway and serves as chief executive officer for the company. Dubbed the 'Netflix for couture,' the online mail-order service rents designer items by the likes of Vera Wang and Versace for a fraction of their original price. Today, according to Forbes, the company is backed by $55.4million in venture capital funding, and employs 200 people - including one of the largest dry-cleaning operations in the nation.