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.