1968 Renax AG, a subsidiary of the former Swissair, started its building maintenance business as a cleaning company in Kloten. In 1985, Hugo Gallo founded Gamma Reinigungen AG in Zurich after having worked in the industry since 1972. His aim was already to respond individually to the wishes of the customers. This orientation and the increasing demand for cleaning services allowed Gamma Reinigungen to grow steadily.

2001 saw the merger of the two cleaning companies Gamma Reinigungen AG with Renax AG, acquired in 1994, to form gammaRenax AG. In 1997, the second generation took the helm: Severin Gallo, a graduate civil engineer ETH, became managing director of gammaRenax and expanded the market area to the whole of Switzerland. Additional services were introduced and in 2004 the subsidiary clean&soft AG was founded for hygiene services.

Heute präsentiert sich gammaRenax mit Sitz in Dübendorf schweizweit als integraler Facility Services-Anbieter mit über 2’200 Mitarbeitenden und 16 Standorten. Das Fokussieren auf Kundenwünsche und deren Erfüllung bildet auch Jahrzehnte nach der Gründung die Basis des kontinuierlichen Umsatzwachstums.