SM Energy Co.

Opened offering of 15 million common shares. Underwriters will receive 30-day option to purchase about 2.25 million additional shares. Net proceeds will pay a portion of the purchase price for acquisition of all of the outstanding membership interests of an entity holding undeveloped leasehold interests, producing wells and associated infrastructure assets in the Midland Basin from Rock Oil Holdings LLC. If this acquisition does not close, remaining net proceeds will support general corporate purposes. Wells Fargo Securities, BofA Merrill Lynch, J.P. Morgan, Barclays, BBVA and RBC Capital Markets are joint book-running managers.