SOUTHWEST ROYALTIES INC

• 10% owner at SOUTHWEST OIL & GAS INCOME FUND X-A LP · on record since Apr 4, 2006
• 10% owner at SOUTHWEST ROYALTIES INSTITUTIONAL INCOME FUND X-B LP · on record since Apr 4, 2006
• 10% owner at SOUTHWEST OIL & GAS INCOME FUND X-B LP · on record since Apr 4, 2006
• 10% owner at SOUTHWEST OIL & GAS INCOME FUND IX-A LP · on record since Apr 4, 2006
• 10% owner at SOUTHWEST ROYALTIES INSTITUTIONAL INCOME FUND X-C LP · on record since Apr 4, 2006
• 10% owner at SOUTHWEST ROYALTIES INSTITUTIONAL INCOME FUND X-A LP · on record since Apr 4, 2006
• 10% owner at SOUTHWEST ROYALTIES INSTITUTIONAL INCOME FUND IX-B LP · on record since Apr 4, 2006
• 10% owner at SOUTHWEST ROYALTIES INSTITUTIONAL INCOME FUND VII-B L P · on record since Sep 26, 2006
• 10% owner at SOUTHWEST ROYALTIES INC INCOME FUND V · on record since Sep 25, 2006
• 10% owner at SOUTHWEST ROYALTIES INC INCOME FUND VI · on record since Sep 25, 2006
• 10% owner at SOUTHWEST OIL & GAS INCOME FUND VIII-A L P · on record since Jul 3, 2006
• 10% owner at SOUTHWEST ROYALTIES INSTITUTIONAL INCOME FUND VIII B L P · on record since Jul 3, 2006
• 10% owner at SOUTHWEST OIL & GAS INCOME FUND VII A L P · on record since Jul 3, 2006
• 10% owner at SOUTHWEST DEVELOPMENTAL DRILLING FUND 91-A LP · on record since Jul 8, 2003
• 10% owner at SOUTHWEST ROYALTIES INSTITUTIONAL INCOME FUND XI-A LP · on record since Jul 8, 2003
• 10% owner at SOUTHWEST DEVELOPMENTAL DRILLING FUND 92-A LP · on record since Nov 13, 2003
• 10% owner at SOUTHWEST ROYALTIES INSTITUTIONAL INCOME FUND XI-B LP · on record since Jan 16, 2004