This directory aims at historical review only and does not claim to provide actual information.
| Company Name | Address | Postcode | Place | Awarded on | Type of award |
| Com One Austria GmbH | Talpagasse 1a | 1230 | Wien | 14.10.1999 | revocable |
| C. Angerer & Göschl OHG | Friedmanngasse 66/1 | 1160 | Wien | 12.07.1927 | revocable |
| C. Duisberg KG | Porschestr. 11 | 1230 | Wien | 21.05.1981 | revocable |
| cafe+co International Holding GmbH | Theodor-Sickel-Gasse 2 | 1100 | Wien | 14.10.2013 | revocable |
| Café-Restaurant Landtmann der Zauners Restaurant Café Landtmann GesmbH | Stadion Center/4.OG/Top 15 Olympiaplatz 2 | 1020 | Wien | 17.06.1974 | revocable |
| Canon Austria GmbH | Oberlaaer Straße 233 | 1100 | Wien | 20.11.1990 | revocable |
| Carl Ohly GmbH & Co KG | Tiefer Graben 21 | 1010 | Wien | vor 2006 | revocable |
| Coca-Cola GesmbH | Am Euro Platz 2 | 1120 | Wien | 24.02.1982 | revocable |
| Comesa GmbH | Tillmanngasse 5 | 1220 | Wien | 19.04.1993 | revocable |
| corporate identity prihoda gmbh | Peter-Jordan-Straße 74 | 1190 | Wien | 22.01.2014 | revocable |
| Cyklop-Gesellschaft Carl Hoffmann OHG | Nottendorfergasse 11 | 1030 | Wien | 08.04.1988 | revocable |
| Company Name | Address | Postcode | Place | Awarded on | Type of award |
