- 2022
- Acquisition of Crearplast S.L. Ibi, Alicante (Spain)
- 2021
- Acquisition of Simplex AG Beringen (Switzerland) / change of name to Simplex Ostendorf GmbH
- 2017
- Construction of a new high-rack warehouse at the head quarters in Vechta.
- 2015
- Fusion with the former company Magnaplast in Emstek near Cloppenburg.
- 2013
- The company Gebr. Ostendorf Kunststoffe GmbH & Co. KG changes its legal form into GmbH.
- 2012
- The subsidiary at the site Rain am Lech is integrated into the company Gebr. Ostendorf Kunststoffe GmbH & Co. KG
- 2011
- Foundation of the subsidiary Ostendorf-Kunststofftechnik Rain GmbH & Co. KG and creation of the plant in Rain am Lech.
- 2010
- The Russian subsidiary Ostendorf RUS GmbH starts plastic production.
- 1994
- The plant in the Czech Republic starts production.
- 1993
- The subsidiary Magnaplast Sp. Z.o.o. in Poland starts production.
- 1989
- Plant in Emstek near Cloppenburg is opened.
- 1973
- Heinrich and Norbert Ostendorf start plastic production.
- 1948
- Franz Ostendorf founds a peat plant in Vechta.