.25% ( 4.25 % ) notes maturing in may 2021 and $ 750 million of floating rate notes ( 201c2013 floating rate notes 201d ) , which were repaid in may 2013 at maturity . net proceeds of this offering were used to fund the repurchase of blackrock 2019s series b preferred from affiliates of merrill lynch & co. , inc . ( 201cmerrill lynch 201d ) . interest on the 4.25% ( 4