FORT WAYNE , Ind . , June 18 / PRNewswire-FirstCall / -- Steel Dynamics , Inc . -- ( Nasdaq / GS : STLD ) announced today that the underwriters of its previously announced offerings of $ 250,000,000 principal amount of 5.125 % convertible senior notes due 2014 and 27,000,000 shares of its common stock have exercised in full their options to purchase an additional $ 37,500,000 principal amount of 5.125 % convertible senior notes due 2014 and an additional 4,050,000 shares of its common stock to cover over-allotments . The exercise of the over-allotment options results in the issuance for these offerings , in the aggregate , of $ 287,500,000 aggregate principal amount of 5.125 % convertible senior notes due 2014 and 31,050,000 shares of common stock . The closings for the exercise of the over-allotment options were on June 18 , 2009 .