The Weir Group PLC (TWG) manufactures slurry handling, shoveling, and pressure pumping equipment with locations in over 50 countries. Operations are organized into three business units: Minerals, Oil & Gas, and ESCO. Common shares are listed on the London (WEIR) exchange. The company traces its name to the Weir brothers who founded the company.

George and James Weir founded G&J Weir in 1871 in Scotland. Peacock Brothers Canada was acquired in 1957. G&J Weir listed on the London stock exchange as The Weir Group in 1946. In 1969, the company acquired Harland Engineering. The company acquired Mather & Platt in 1987 and Liquid Gas Equipment UK in 1989. Boston-based Atwood & Morrill was acquired in 1990. In 1991, California-based Peabody Floway was acquired. Weir acquired Allen Gwynnes in 1992, Envirotech in 1994, Batley Valve in 1996, Schabaver & Sebim in 1998, and Warman International in 1999.

In 2005, Milan-based Gabbioneta was acquired. Texas-based SPM and Queensland-based Multiflo were acquired in 2007. The company acquired 3 companies in 2008: South Africa-based CH Warman, Texas-based Mesa Manufacturing, and Baku-based Standard Oilfield Services. 2010 acquisitions included Linatex (Malaysia), BDK (India), American Hydro (Pennsylvania), and Ynfiniti Engineering Services (Spain). HMI Tech (Korea), Seaboard (Texas) were acquired in 2011, and Mathena (Oklahoma) and Novatech (Texas) were purchased in 2012. The 2013 acquisition class includes Xmeco Foundry (South Africa), Cheong foundry (Malaysia), R. Wales (Canada), and Aspir.

Weir acquired Metra and Trio Engineered Products in 2014 as well as Delta Industrial Valves Inc. in 2015. In 2018, the company acquired Portland-based mining tool company ESCO, establishing a new division.

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