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| Company | Country | Branch |
| 3U Telekommunikation | Germany | Telecommunication |
| 4MBO | Germany | Trade |
| A.S. Creation Tapeten | Germany | Construction Materials |
| Aachener Straßenbahn & Energieversorgungs-AG | Germany | Transport |
| Aachener und Münchener Lebensversicherung | Germany | Insurance |
| Aachener und Münchener Versicherung | Germany | Insurance |
| aap Implantate | Germany | Medicine |
| Aareal Bank | Germany | Bank |
| Abacho (früher: Endemann Internet) | Germany | Internet |
| ABB Asean Brown Bovero | Germany | Electronics |
| Abit | Germany | Software |
| ACG Chipk. Info | Germany | Trade |
| Achterbahn | Germany | Media |
| Acordis | Germany | Holdings |
| AC-Service | Germany | IT Service |
| Actium Beteiligungs AG | Germany | Holdings |
| Actris AG (Fusioniert aus Henninger und Eichbaum Brauerei) | Germany | Beverages |
| Ad Pepper Media | Germany | Media |
| AdCapital (früher: Berliner Elektro) | Germany | Electronics |
| Adidas-Salomon | Germany | Clothes |
| Aditron | Germany | |
| Adler Real Estate | Germany | Real Estate |
| AdLINK Internet Media | Germany | Internet |
| Adori | Germany | Internet |
| AdPhos | Germany | Engineering |
| ADS Anker | Germany | |
| ADS System | Germany | Computer |
| Adva Optical Netw. | Germany | Computer |
| Advanced Medien | Germany | Media |
| Advorga Beteiligungen | Germany | Holdings |
| Agfa-Gevaert | Germany | Consumer Goods |
| Agiplan Technosoft | Germany | Software |
| Agiv Real Estate | Germany | Engineering |
| AHAG Wertpapierhandelshaus | Germany | Finance |
| Ahlers AG ST | Germany | Clothes |
| Ahlers AG VZ | Germany | Clothes |
| Aixtron | Germany | Engineering |
| Aktienbrauerei Kaufbeuren | Germany | Beverages |
| Albingia Versicherung | Germany | Insurance |
| Alcatel SEL | Germany | Telecommunication |
| Alexanderwerk | Germany | Engineering |
| Allbecon | Germany | Part-Time Work |
| Allerthal-Werke | Germany | Holdings |
| Allgäuer Alpenwasser AG | Germany | Beverages |
| Allgäuer Brauhaus | Germany | Beverages |
| Allgeier | Germany | IT Service |
| Allgemeine Gold- und Silberscheideanstalt (Allgussa) | Germany | Precious Metals |
| Allgemeine Privatkundenbank | Germany | Bank |
| Allianz Lebensversicherung | Germany | Insurance |
| Allianz NA | Germany | Insurance |
| Allweiler | Germany | Engineering |
| Alno | Germany | Furniture |
| Alphaform | Germany | Others |
| Alsen | Germany | Construction Materials |
| Altana | Germany | Pharmaceuticals |
| Amadeus | Germany | Part-Time Work |
| Amatech | Germany | Internet |
| AMB Generali Holding | Germany | Insurance |
| Analytik Jena | Germany | Medicine |
| Andreae-Noris Zahn | Germany | Pharmaceuticals |
| Antwerpes | Germany | Internet |
| Apcoa Parking | Germany | Transport |
| Aqua Signal | Germany | Electronics |
| Aquatec | Germany | |
| ARBOmedia | Germany | Media |
| Areal Immobilien und Beteiligungs-AG | Germany | Real Estate |
| Armstrong Dlw | Germany | |
| Arndt | Germany | Car Industry |
| artnet.com | Germany | Internet |
| ArtStor | Germany | Computer |
| Arxes (Hancke & Peter) | Germany | IT Service |
| ATB Antriebstechnik | Germany | Electronics |
| Atoss Software | Germany | Software |
| Audi | Germany | Car Industry |
| Augsburger Kammgarn-Spinnerei | Germany | Clothes |
| Augusta Technologie | Germany | Holdings |
| Autania | Germany | Engineering |
| AVA | Germany | Trade |
| AWD Holding | Germany | Finance |
| Axa Colonia Konzern ST | Germany | Insurance |
| AXA Colonia Lebensversicherung | Germany | Insurance |
| AXA Colonia Versicherung | Germany | Insurance |
| Axel Springer Verlag | Germany | Media |
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