This June 26, 2012 image provided by Forbes, and the pull-out cover for the magazine's Sept. 21 issue shows from left to right: Warren Buffett, Oprah Winfrey, Bill Gates, Melinda Gates, Pete Petersen, Leon Black, Jon Bon Jovi (seated on the ground), Marc Benioff, David Rubenstein, Steve Case, Laura Arrillaga-Andreessen, Marc Andreessen posing for a portrait in the Trustees Room at the New York Public Library in New York. The twelve individuals shown were part of a group attending a Forbes convened event called the Forbes 400 Summit On Philanthropy. During the event, the magazine's editors invited twelve of the leading philanthropists in the U.S. to pose for the portrait. (AP Photo/Forbes, Michael Prince)
Sam Zell, 70, Chicago, real estate, private equity: $3.8 billion. #103 on the Forbes 400 list.
Ken Griffin, 43, Chicago, hedge funds: $3.1 billion. #128 on Forbes 400 list.
Jay Robert (J.B.) Pritzker, 47, Chicago, hotels, investments: $2.5 billion. #179 on Forbes 400 list.
Ty Warner, 68, Oak Brook, Beanie Babies: $2.4 billion. #190 on Forbes 400 list.
Thomas Pritzker, 62, Chicago, hotels, investments: $2.2 billion. #218 on Forbes list of richest 400 Americans.
William Wrigley, Jr., 48, chewing gum, $2.2 billion. #218 on Forbes 400 list of billionaires
Neil Bluhm, 74, Chicago, real estate, $2.1 billion. #229 on Forbes 400 list.
J. Christopher Reyes, 58, Lake Forest, food distribution, $2 billion. #239 on Forbes 400 list.
Jude Reyes, 57, Kenilworth, food distribution, $2 billion. #239 on Forbes 400.
Jean (Gigi) Pritzker, 50, hotels, investments, $1.9 billion. #250 on Forbes 400 list of billionaires
Penny Pritzker, 53, Chicago, hotels, investments, $1.8 billion. #271 on Forbes 400 list of billionaires
Joe Mansueto, 56, Chicago, investment research, $1.65 billion. #297 on Forbes 400 list of billionaires
James Pritzker, 61, Chicago, hotels, investments, $1.5 billion. #311 on Forbes 400 list of billionaires
Patrick Ryan, 75, Winnetka, insurance, $1.2 billion. #360 on Forbes 400 list of billionaires
Groupon co-founder Eric Lefkofsky didn't make this year's Forbes 400 list.
Groupon Inc. Chairman Eric Lefkofsky gives a keynote speech at the Annual Chamber dinner for Northbrook at the Renaissance North Shore on Tuesday. | Allison Williams~for Sun-Times Media
Warren Buffett, $46 billion