Share Buy-Back

10 December 2015

Thalassa Holdings Ltd

(Reuters: THAL.L, Bloomberg: THAL:LN)

("Thalassa" or "the Company")

Share Buy-Back

The board announces that on 9 December 2015 the Company purchased 740,000 of its shares at a price of 43.83 pence per share. These shares will be held in treasury and in total there are now 1,140,000 shares currently in treasury. This purchase was made in accordance with the Company's Articles of Association and with a board authority to buy back up to £1,000,000 of the Company's shares.

The Company advises that, following this purchase, the Company's issued share capital remains unchanged at 25,067,522. The total number of shares with voting rights is now 23,927,522. This figure represents the total voting rights in the Company and may be used by shareholders as the denominator for the calculations by which they can determine if they are required to notify their interest in, or a change to their interest in, the Company under the Financial Conduct Authority's Disclosure and Transparency Rules.

Investor Enquiries:

Thalassa Holdings Ltd

Duncan Soukup, Chairman +33 (0)6 78 63 26 89

WH Ireland Limited (Nominated Adviser and Broker)

Chris Fielding, Head of Corporate Finance +44 (0)207 220 1650

Press Enquiries:

Square1 Consulting (Public Relations)

David Bick/Brian Alexander +44 (0)207 929 5599

www.thalassaholdingsltd.com

Note to Editors:

Thalassa Holdings Ltd, incorporated and registered in the BVI and quoted on AIM, is a holding company with subsidiaries in the Energy Services and Defence and Homeland Security Industries, with a focus on marine seismic operations.