Half year and second quarter report 2013 Second quarter

Second quarter 2013 • Production from Oman and Lithuania of 399,839 barrels corresponding to 4,394 barrels per day • Tethys Oil approved for listing on NASDAQ OMX Stockholm • Drilling program with 3 appraisal wells launched on B4EW4 structure on Block 4 in Oman • An additional drilling rig, the third in operation within the Block 3 and 4 area, has been employed • Lithuania exploration well flows small amounts of oil and confirms presence of an active petroleum system • Net sales of MSEK 110 (MSEK 154) • Net result after tax MSEK 39 (MSEK 15) • Earnings per share before and after dilution of SEK 1.10 (SEK 0.46) • Second quarter sales negatively impacted by timing differences following over and under lift adjustments • The investment budget has been extended from MSEK 300 to MSEK 355 to fund appraisal drilling and additional seismic   Half year 2013 • Net sales of MSEK 257 (MSEK 298) • Net result after tax MSEK 144 (MSEK 123) • Earnings per share before and after dilution of SEK 4.04 (SEK 3.75)     Subsequent events • Second appraisal well on B4EW4 structure has been drilled to its final depth and encountered oil – testing in progress • Tethys Oil’s share of production from Oman during July amounted to 139,998 barrels corresponding to 4,516 barrels per day   1 Jan 2013 - 1 Apr 2013 - 1 Jan 2012 1 Apr 2012 - 1 Jan 2012 - MSEK (unless 30 Jun 30 Jun - 30 Jun 30 Jun 31 Dec specifically 2013          2013          2012       2012          2012          stated) 6 months 3 months    6 3 months 12 months months Production, before 768,321 399,839 586,562 302,081 1,345,854 government take (bbl) Net sales, after 366,354 156,816 380,416 184,994 776,248 government take (bbl) Average selling price 107.68 107.26 113.83 119.34 110.35 per barrel, USD Net sales of 257 110 298 154 584 oil and gas Operating 173 49 122 -4 336 result EBITDA 237 83 238 120 530 Result for 144 39 123 15 314 the period Earnings per 4.04 1.10 3.75 0.46 9.11 share, SEK Cash and cash 237 237 44 44 248 equivalents Shareholders’ 990 990 704 704 860 equity Long term 419 419 3 3 417 debt Investments 149 114 442 232 875     (For full report, see attached file)   For further information, please contact Magnus Nordin, Managing Director, phone +46 8 505 947 02; magnus@tethysoil.com or Morgan Sadarangani, CFO, phone +46 8 505 947 01; morgan@tethysoil.com   Tethys Oil is a Swedish energy company focused on exploration and production of oil and natural gas. Tethys Oil’s core area is Oman, where the company is one of the largest onshore oil and gas concession holders. Tethys Oil also have exploration and production assets onshore France, Lithuania and Sweden. The shares are listed on NASDAQ OMX Stockholm (TETY).