Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Franz Wolfgang Steyer GmbH
- Ing. Franz Wolfgang Steyer Holding GmbH
- Ing. Franzmair Monika Maria
- Ing. Fraundorfer Gerhard
- Ing. Fraydl August Martin
- Ing. Frederik Wilhelm
- Ing. Freisinger Johann
- Ing. Freitag Gerhard
- Ing. Freudenthaler Matthias
- Ing. Freudenthaler Wolfgang
- Ing. Freunberger Erich Anton
- Ing. Freund Franz
- Ing. Frey Frank
- Ing. Friedl Mathias
- Ing. Friedl Petra
- Ing. Friedrich Lindl GmbH
- Ing. Friedrich Luchinetti, Forstgut Sonnberg, Privatstiftung
- Ing. Friedrich Preinl Gesellschaft m.b.H.
- Ing. Friedrich Rudda Gesellschaft m.b.H.
- Ing. Friedrich Schandl
- Ing. Friedrich Wilhelm
- Ing. Friedrich Öller e.U.
- Ing. Friedrich Öller e.U.
- Ing. Frieß Otto Anton
- Ing. Fritsch Trade GmbH
- Ing. Fritz Haiböck e.U.
- Ing. Fritz Manschein GmbH
- Ing. Fritz Manschein GmbH
- Ing. Fritzer Dominik Alois
- Ing. Frohnwieser Hans Christian
- Ing. Frolik Andreas
- Ing. Fronius Klaus
- Ing. Froschhauser Josef
- Ing. Fross Martin
- Ing. Fruhmann Robert
- Ing. Fruhmann Robert Martin
- Ing. Fröch Angelika
- Ing. Fröhlich Thomas
- Ing. Fröschl Jürgen
- Ing. Fröschl Michael
- Ing. Fröschl Michael
- Ing. Fröschl Michael
- Ing. Fröstl Gernot Joachim
- Ing. Frühwirth Christoph Karl
- Ing. Frühwirth Heinrich Günther
- Ing. Fuchs Bernadette Christina
- Ing. Fuchs Bernhard
- Ing. Fuchs Christian Franz
- Ing. Fuchs Georg
- Ing. Fuchs Leopold
- Ing. Fuchs Mario
- Ing. Fuchs Peter
- Ing. Fuchsjäger Gerald Michael Alexander
- Ing. Fuger Sascha Simon
- Ing. Färber Hannes
- Ing. Förster Christian Dieter
- Ing. Förstl Gesellschaft m.b.H.
- Ing. Fössl Robert Peter
- Ing. Füchsl Johann
- Ing. Fürst Reinhard
- Ing. Fürtler Michael
- Ing. G. + M. Schurz Gesellschaft m.b.H.
- Ing. G. F. Sattler u. Co.
- Ing. G. Schlosser GmbH
- Ing. Gaal Andreas
- Ing. Gabbichler Thomas
- Ing. Gabler Michael
- Ing. Gabmann Edmund
- Ing. Gabriel Albrecht-Christian
- Ing. Gabriel Walter
- Ing. Gadner Gerhard
- Ing. Gaggl Franz Ferdinand
- Ing. Gahbauer Stefan
- Ing. Gahleitner Robert
- Ing. Gaich Christian Gerhard
- Ing. Gala Maximilian
- Ing. Gall Wolfgang
- Ing. Gall Wolfgang
- Ing. Gallautz Otto Helmut
- Ing. Gamperl Dominik