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| Company | Country | Branch |
| LPA Group | United Kingdom | Electronics |
| LPKF Laser & Electronics | Germany | Engineering |
| LS Telecom | Germany | Software |
| LSB Bancshares, Inc. | USA | |
| LSI Logic | USA | Electronics |
| LTG Technologies | United Kingdom | |
| LTX Corporation | USA | |
| Lucille Farms, Inc. | USA | |
| Ludwig Beck am Rathauseck | Germany | Trade |
| Lufkin Industries, Inc. | USA | |
| Lufthansa | Germany | Transport |
| Luk Fook Holdings (International) | Hong Kong | Holdings |
| Lukoil | Russia | Oil |
| Luminant Worldwide Corporation | USA | |
| Luminar | United Kingdom | Consumer Goods |
| Lumisys Incorporated | USA | |
| Lunar Corporation | USA | |
| Lundbeck | Denmark | Pharmaceuticals |
| Lundin Oil | Sweden | Commodities |
| Lung Kee (Bermuda) Holdings | Bermuda | Holdings |
| Lupus Capital | United Kingdom | Finance |
| Luxottica | Italy | Consumer Goods |
| Luxtec Corporation | USA | |
| LVMH Moet Hennessy | France | Consumer Goods |
| Lycos Europe | Germany | Internet |
| Lycos, Inc. | USA | Internet |
| Lynch Corporation | USA | |
| Lynch Interactive Corporation | USA | |
| Lynx Group | United Kingdom | Software |
| Lynx Therapeutics, Inc. | USA |
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