1994; Calder Group formed through an MBO of metals businesses from Cookson PLC.

1995; Acquisition of Calder Group by Rubicon PLC.

1998; Secondary MBO of Calder Group by Permira (Schroder Ventures). Closure of the (loss-making) Newcastle lead smelter.

2001; Consolidated German operations into one factory at Krefeld.

2002; Consolidated UK operations into a new purpose-built factory at Chester.

2003; Acquisition of the lead-sheet business of JL Goslar, Germany.

2004; Acquisition of the coated products business of JL Goslar, Germany.

2006; Secondary MBO of Calder Group led by German Capital.

2007; Acquisition of Helander Precision Engineering Ltd.

2008; Acquisition of Midland Aerospace Ltd.

2009; Acquisition of the lead sheet business of Umicore NV, Belgium.

2010; Construction of Manufacturing Hall 8 at R+S, Krefeld, Germany.

2011; Start-up of Aquila Nuclear Engineering Ltd.

2012; Ramius becomes majority shareholder and lead investor. Investment in new lead refinery at Metal Processors Ltd, Dublin.

2016; Construction of Manufacturing Hall 9 at R+S, Krefeld, Germany.