Self-made billionaire Meg Whitman. Image via Wikipedia  Of the 400 richest Americans on this year’s list, released this week, just 42 are women, a number that hasn’t changed since last year’s list. Of these, only four — or 1% of the entire list — are self-made billionaires.  One of America’s four self-made super-rich women is former eBay chief Meg Whitman, who hit headlines this week with news that she’s been tapped to take over as head of computing giant HP. Her wealth got a boost alongside eBay’s shares, which were up 10% year on year. Forbes’ wealth team will be watching closely as she looks to turn HP’s fortunes around.  The richest self-made woman on the Forbes 400 remains, of course, talk show queen Oprah Winfrey. Her net worth is stagnant this year, still pegged at $2.7 billion. Whether her new OWN network will boost her fortune by next year’s list remains to be seen. The other self-made women on our list are Gap’s Doris Fisher and ABC Supply’s Diane Hendricks, who cofounded their companies with their late husbands.  It may come as no surprise that the two richest women in America have ties to retail juggernaut Wal-Mart. Heiresses Christy Walton and Alice Walton, the 6th and 10th richest people in America respectively, have both seen their fortune grow this year, but not by much compared to some of the other women on the list. Wal-Mart shares were up just 3% since 2010, accounting for the relatively small boost.  You’ve probably never heard of the woman who saw her wealth grow the most since the last Forbes 400: Tamara Gustavson, daughter of Public Storage founder Bradley Hughes, himself a longtime rich list member. Gustavson made her Forbes 400 debut last year, and now owns more shares in the storage giant than the rest of her family combined. Her father continues to shed his assets to Gustavson and her brother B. Wayne Hughes Jr, who is poised to make our list soon if Public Storage’s stock continues to perform well. Gustavson’s net worth is up $1.3 billion since last year’s list as a result. She keeps a low profile, living in Malibu, Calif. with her husband Eric and running a real estate firm.  See below for our full list of women on the Forbes 400, along with their ranking and details of each member’s fortune this year compared to last.  Follow me on Twitter: @Clare_OC
Of this year's 400 richest Americans, 42 are women. Oprah's on there, and so is Meg Whitman - but others keep a much lower profile.