Please note that the contact details for registering a Proxy and/or the Form of Registration with DnB NOR Bank ASA, TGS' Share Register manager, in the Notice of the Ordinary General Meeting 2009 issued on 1 May, 2009 were incorrect and should not be used.

The correct address and telefax number is:
DnB NOR Bank ASA, Verdipapirservice, Stranden 21, N-0021 Oslo, Norway.
Telefax: + 47 22 48 11 71

Registration may also be made via the company's website

The Proxy and Form of Registration have been updated on the TGS website and is also attached in English and Norwegian.

The ordinary General Meeting of TGS-NOPEC Geophysical Company ASA will be held on 4 June, 2009 at Shippingklubben, Haakon VII's gate 1, Oslo, at 16:00 hrs.

TGS apologizes for any inconvenience that this has caused.

Proxy and Form of Registration English

Proxy and Form of Registration Norwegian