SM Energy Co., Denver, (NYSE: SM) has closed its offer to exchange $350 million of its 6.5% senior notes due 2021 for $350 million of its outstanding 6.5% senior notes due 2021, which were issued on Nov. 8, 2011, in a private placement.

The exchange offer expired on March 6 with $349.095 million in aggregate principal amount of the original notes having been validly tendered in exchange for an equal amount of exchange notes.