Stan O'Neal

Formerly of Merrill Lynch

Gave $130,000 through his foundation in 2006. But a company spokesperson says O'Neal is a "seven-figure" donor outside the charity and has been particularly generous to the Bronx Preparatory Charter School, in New York.

Eddie Lampert

ESL Investments

Set up a $2.5 million foundation last year. But he'll have to give away more than that on an annual basis if he wants to crack the top 50. ESL says Lampert gives to a variety of charitable causes, both directly and through his foundation.

Stephen Schwarzman

Blackstone Group

His foundation has $63,424; Blackstone says it's defunct. But he made a 2004 pledge to the Kennedy Center for the Performing Arts, in Washington: $10 million over six years.

Richard Fuld

Lehman Brothers

Records show $35,772 in his foundation. But Lehman says the foundation is not the primary vehicle for Fuld's philanthropy. Fuld gives in excess of $10 million a year, the firm says, but prefers to keep his contributions private.