1965 - Founding of Amgas ("Amersfoortse Gasafvoeren").
1970 - Production of exhaust systems in own facility, located in Middelburg
1975 - First export of stainless steel products to Germany, which eventually let to the founding of Ontop GmbH.
1990 - Extension of the international network with subsidiary Metaloterm France S.A.R.L., in France.
2005 - Factory and office for the domestic market in Poland, Ontop Polska Sp. z o.o.
2010 - Ontop B.V. exists 45 years.