Financial disclosure forms don't necessarily paint a comprehensive picture of a candidate's financial situation. As the Washington Post reported in April (and as TLW has discussed extensively on the show) most of what we have learned about Romney's finances have come from the 2010 tax return he released back in January. The WaPo article states:
Several of Romney's assets — including a large family trust valued at roughly $100 million, nine overseas holdings and 12 partnership interests — were not named initially on his disclosure forms, emerging months later when he agreed to release his tax returns... Romney's tax forms showed holdings in a Swiss bank account, a real estate trust and nine offshore accounts not named on the public disclosure reports.
More on the show tonight at 10pm ET.