Thalassa (di) Regulatory News (THAL)

Thalassa Holdings Ltd

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

("Thalassa" or the "Company")

Admission of new Ordinary Shares to trading on AIM

Further to the announcement on 23 November 2012, Thalassa announces that application will be made for the 2,125,000 new ordinary shares to be admitted to trading on the AIM market. Admission of these shares is expected to take place on 30 November 2012.

In accordance with the FSA's Disclosure and Transparency Rules and subsequent to the latest issue, the Company advises that its total capital comprises 13,317,522 Ordinary Shares.

The Company currently holds 1,462,000 Ordinary Shares in treasury and as such the Company's issued share capital (excluding shares held in treasury) consists of 11,855,522 Ordinary Shares, with one voting right per share.

The above figure of 11,855,522 may be used by shareholders in the Company as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the issued share capital of the Company under FSA's Disclosure and Transparency Rules.

Contacts:

Thalassa Holdings Ltd:

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

WH Ireland Limited (Nominated adviser):

Chris Fielding, Head of Corporate Finance 020 7220 1650

www.thalassaholdingsltd.com

Notes to Editor:

Thalassa Holdings Ltd, incorporated and registered in the BVI and quoted on AIM, is a holding company with a focus on marine seismic operations. The corporate strategy for the Group is "Exploration and Beyond". "Exploration" is focused on activity in frontier and challenging locations, whilst "Beyond" focuses on production activity by looking to secure opportunities in the permanent reservoir monitoring market. Thus activity and focus will be dominated by projects in remote and challenging frontier locations, coupled with lower risk projects in mature producing regions.

Alongside the technical expertise and consultancy in marine seismic operations provided through its subsidiary, WGP, the Group owns and operates two portable modular source systems (PMSS™). The PMSS™ generates a seismic source for use in seismic acquisition for use in petroleum exploration and production. The equipment is temporarily installed on the back of a platform supply vessel for the purposes of acquiring data.