In In re KB Toys,¹ a recent decision by the Third Circuit Court of Appeals, the Court held that a claim that is disallowable under § 502(d)² if held by the original claimant is also disallowable in the hands of a purchaser or subsequent transferee. In other words, if a creditor sells or assigns its claim to a claims trader and the creditor later becomes liable on a preference or fraudulent transfer,³ the claim may be disallowed in the hands of the claims trader if the creditor fails to pay the amount it owes to the estate.