The available evidence suggests that they are not. Every five years, the Census Bureau conducts its nationwide Survey of Business Owners. The SBO samples privately held, nonfarm businesses of all ages, from recently founded to many years in existence. Using SBO data, the American Express OPEN report for 2011 found that just percent of women-owned firms had revenues more than $1 million. The figure for men-owned firms was percent In public perception, the $1 million threshold has become a sort of magic number. An article about the Amex OPEN report compared the mark to ―Heartbreak Hill,‖ the.