Deputy CFO Appointed

April 16, 2013

CAMANA BAY, GRAND CAYMAN — (Marketwired) — 04/16/13 — Tethys Petroleum Limited (“Tethys” or the “Company”) (TSX:TPL)(LSE:TPL) today announced the appointment of Denise Lay as Deputy Chief Financial Officer (Deputy CFO) with immediate effect.

Denise has been promoted from her previous position of Vice President Finance with the Company as part of the ongoing strengthening of the Company’s finance team. She has worked for Tethys since October 2009.

Denise is a Fellow of the Association of Chartered Certified Accountants (ACCA) with over 15 years of post qualification experience having worked for KPMG and several international companies, including the Gallaher Group PLC, Ricoh Company Ltd. and in a variety of industries including oil and gas. Denise graduated with a BA (Hons) degree in Russian and French from the School of Slavonic and East European Studies of the University of London and has worked extensively in Kazakhstan and in Russia.

Dr. David Robson, Executive Chairman and President of Tethys said, “I am delighted that Denise is being promoted to Deputy CFO with Tethys. She has shown herself to be an extremely competent, professional, skilled and committed senior member of the Tethys team since she joined the Company and I am sure that in this new role she will continue to excel and contribute to Tethys’ future growth and development.”

Tethys is focused on oil and gas exploration and production activities in Central Asia with activities currently in the Republics of Kazakhstan, Tajikistan and Uzbekistan.

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Source: Tethys Petroleum Limited