Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Siegfried Manschein GmbH
- Ing. Siegl-Cachedenier Franz
- Ing. Siemer Alexander
- Ing. Sikora Milan
- Ing. Sikora Sandra
- Ing. Silberbauer Roland
- Ing. Siller Anton
- Ing. Sillipp Arnold
- Ing. Sillipp Gerald
- Ing. Silvester Schattauer Familienholding GmbH
- Ing. Simka Roman
- Ing. Simmer Bernhard
- Ing. Simml Paul Dominikus
- Ing. Simon Gerald
- Ing. Simon Thomas
- Ing. Simonich Thomas
- Ing. Sinanovic Mirel
- Ing. Singer Peter Hermann
- Ing. Singer-Schnöller Alexander
- Ing. Sirnik Heimo
- Ing. Six Richard Anton
- Ing. Sixl Peter Markus
- Ing. Skerjanz Michael
- Ing. Skerlak Walter
- Ing. Skoff Gregor
- Ing. Skomar Sascha
- Ing. Skopik Dieter
- Ing. Skrabl Christine
- Ing. Slamanig Matthias
- Ing. Slavisa Peric, MSc e.U.
- Ing. Sloboda Tomas
- Ing. Smit Hans Jolmer
- Ing. Smole Rene
- Ing. Sokolik Martin
- Ing. Sokoll Wolfgang
- Ing. Sommer Bernhard Anton
- Ing. Sommerauer Andreas
- Ing. Sommerer Markus
- Ing. Sommerhuber Dieter
- Ing. Sorg Roland
- Ing. Sorian Heike
- Ing. Sorz Robert
- Ing. Soukal Wolfgang
- Ing. Soukop Nerijus
- Ing. Spannring Gerald
- Ing. Spatt Florian
- Ing. Spendier Kurth
- Ing. Spendlhofer Reinhard
- Ing. Sperk Thomas
- Ing. Spiegelgraber Mario
- Ing. Spielmann Peter
- Ing. Spindler Herwig
- Ing. Spindler Josef
- Ing. Spindler Josef
- Ing. Spitaler Ewald
- Ing. Spitzenberger Fabian
- Ing. Spitzenberger Manuel
- Ing. Spitzer Rainer
- Ing. Spitzer Thomas Friedrich
- Ing. Spitzer Thomas Manfred
- Ing. Spitzl Markus
- Ing. Spreitzer-Gröbner Friedrich
- Ing. Sprenger Johann
- Ing. Springer Tanja Christina
- Ing. Späth Michael
- Ing. Stachetsberger Andreas
- Ing. Stadlbauer Alexandra
- Ing. Stadlbauer Norbert Franz
- Ing. Stadler Andreas
- Ing. Stadler Christian
- Ing. Stadler Christopher
- Ing. Stadler Günter Klaus
- Ing. Stadler Karl
- Ing. Stadlmann Andreas
- Ing. Stadlober Hans Georg
- Ing. Stadt Christoph
- Ing. Stampfel Oskar
- Ing. Stampfl Martin
- Ing. Stancescu Ion Gheorghe
- Ing. Stangl Alfred