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| Company | Country | Branch |
| Iomed, Inc. | USA | |
| Ion Networks Inc | USA | |
| Iona Technologies | Ireland | Software |
| iParty Corporation | USA | Internet |
| IPC Arctec | Germany | Internet |
| IPC Communications, Inc. | USA | |
| IPF Finance | Australia | Finance |
| IPG Photonics | USA | |
| IPO Board.net | Austria | Holdings |
| iPrint.com, inc. | USA | |
| IPS | Czech Republic | Construction |
| IQE | United Kingdom | Electronics |
| Iquest Networks | Canada | Software |
| IRIDEX Corporation | USA | |
| Irish Continental Group | Ireland | Transport |
| Irvine Sensors Corporation | USA | |
| Irwin Financial Corporation | USA | Finance |
| IS4B AG | Austria | |
| Isar-Amperwerke | Germany | Energy |
| Isco, Inc. | USA | |
| ISG International Software Group Ltd. | Israel | Software |
| Ishihara Sangyo Kaisha | Japan | Pharmaceuticals |
| Ision Internet | Germany | Internet |
| Isis Pharmaceuticals, Inc. | USA | Pharmaceuticals |
| Isle of Capris Casinos, Inc. | USA | |
| Isoft Group | United Kingdom | Software |
| Isotron | United Kingdom | Medicine |
| Isra Vision | Germany | Software |
| ISS Group, Inc. | USA | Software |
| i-STAT Corporation | USA | |
| IT Way | Italy | Software |
| Italcementi SPA | Italy | Construction Materials |
| Italgas | Italy | Energy |
| Italian-Thai Development | Thailand | Real Estate |
| ITC DeltaCom, Inc. | USA | |
| ITC Learning Corporation | USA | |
| ITE Group | United Kingdom | Media |
| Itelligence | Germany | IT Service |
| ITI Technologies, Inc. | USA | |
| Itis Holdings | United Kingdom | Transport |
| Itnet | United Kingdom | IT Service |
| ITOCHU-Shokushin | Japan | Trade |
| Itron, Inc. | USA | |
| ITT Industries | USA | |
| iTurf, Inc. | USA | |
| ITXC Corp. | USA | |
| Ivanhoe Energy | Canada | Commodities |
| IVAX Corporation | USA | Biotechnology |
| IVG Holding | Germany | Real Estate |
| IVI Checkmate Corp. | USA | |
| iVillage, Inc. | USA | |
| IVU Traffic Technologies | Germany | Logistics |
| Iwerks Entertainment, Inc. | USA | |
| IWKA | Germany | Engineering |
| Ixchange Tech. | South Africa | Software |
| iXL Enterprises, Inc. | USA | |
| IXNet, Inc. | USA | |
| Ixos Software | Germany | Software |
| Izodia | United Kingdom | Software |
| Index | I0 | IA | IB | IC | ID | IE | IF | IG | IH | II | IJ | IK | IL | IM | IN | IO | IP | IQ | IR | IS | IT | IU | IV | IW | IX | IY | IZ | Home |