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In order to perfect the security interest in the stock, the creditor must file a UCC-1. However, if the creditor does not file the UCC-1, it does not make the loan unsecured, it only makes the security interest unperfected. That means that if you went out and tried to use the stock as collateral on a separate loan or you become insolvent, it could result in a loss of the security interest by the creditor.
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