Schilling told WEEI-AM in Boston on Thursday that he "put himself out there" in personally guaranteeing loans to 38 Studios, which filed for bankruptcy in June.
He listed the sock and other memorabilia as collateral to a bank in a September filing with the Massachusetts Secretary of State. Schilling told the station he is seeking an "amicable" solution with the bank.
The Boston Globe first reported the filing Thursday.
38 Studios was lured to Rhode Island from Massachusetts with a US$75 million loan guaranteed by the state.