Subsidiary

Jurisdiction

Concept Systems Holdings Limited

Scotland

Concept Systems Limited

Scotland

GMG/AXIS, Inc.

Delaware

GX Geoscience Corporation S. de R.L. de C.V.

Mexico

GX Technology Australia Pty Ltd.

Australia

GX Technology Canada, Ltd.

Canada

GX Technology Corporation

Texas

GX Technology EAME, Limited

UK

GX Technology Imaging Services Limited

Egypt

GX Technology Poland Sp. Z o.o.

Poland

GX Technology Processamento de Dados Ltda.

Brazil

GX Technology Sismica Brasil Ltda.

Brazil

GX Technology Trinidad, Ltd.

West Indies

I/O Cayman Islands, Ltd.

Cayman Islands

I/O International Holdings, Ltd.

Cayman Islands

I/O International, Ltd.

Cayman Islands

I/O Luxembourg S.à r.l.

Luxembourg

I/O Marine Systems Limited

UK

I/O Marine Systems, Inc.

Louisiana

I/O U.K. Holdings Limited

Scotland

“Inco” Industrial Components ‘s-Gravenhage B.V.

Netherlands

ION China Holdings, Limited

Hong Kong

ION E&P Advisors, Inc.

Delaware

ION EPA Holdings, Inc.

Delaware

ION Exploration Products (U.S.A.), Inc.

Delaware

ION Geophysical CIS LLC

Russia

ION Geophysical Sdn. Bhd.

Malaysia

ION HPC Services, Inc.

Delaware

ION International Holdings L.P.

Bermuda

ION International S.à r.l.

Luxembourg

IPOP Management, Inc.

Delaware

OceanGeo B.V.

Netherlands

OceanGeo Inc.

British Virgin Islands

OceanGeo Ltd.

UK

Oceangeo Tecnologia de Exploração de Reservatórios do Brasil EIRELI

Brazil

Sensor Nederland B.V.

Netherlands