EXHIBIT 21.1

SUBSIDIARIES

OF

SM ENERGY COMPANY

A. Wholly-owned subsidiaries of SM Energy Company, a Delaware corporation:

1.Four Winds Marketing, LLC, a Colorado limited liability company

2.    SMT Texas LLC, a Colorado limited liability company

3.    Energy Leasing, Inc., an Oklahoma corporation

4.    Belring GP LLC, a Delaware limited liability company

5.    St. Mary Energy Louisiana LLC, a Delaware limited liability company

6.Hilltop Investments, a Colorado general partnership

7.    Parish Ventures, a Colorado general partnership

8. Green Canyon Offshore LLC, a Delaware limited liability company.

B.Other subsidiaries of SM Energy Company:

1. Box Church Gas Gathering, LLC, a Colorado limited liability company (59%)

C. Partnership or limited liability company interests held by SM Energy Company:

1. Potato Creek Midstream, LLC, a Pennsylvania limited liability company (70%)

2. Trinity River Systems, LTD, a Texas limited partnership (21%)

3. 1977 H.B Joint Account, a Colorado general partnership (8%)

4. 1976 H.B Joint Account, a Colorado general partnership (9%)

5. 1974 H.B Joint Account, a Colorado general partnership (4%)

6. Sycamore Gas Systems, an Oklahoma general partnership (3%)

D.Partnership interests held by SMT Texas, LLC:

1. St. Mary Land East Texas LP, a Texas limited partnership (99%) (the remaining 1% interest is held by SM Energy Company)