Weir Group
A Scottish engineering group supplying equipment and technology for mining and mineral processing.
Last updated November 4, 2026
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Overview
Weir Group is a Scottish multinational engineering company headquartered in Glasgow. Founded in 1871 by brothers George and James Weir as G. & J. Weir Ltd., the company initially developed pumps and related engineering equipment for the Clyde shipbuilding industry and the steamships produced there. Its early products included boiler feedwater pumps, evaporators, and auxiliary systems, establishing a technical reputation that supported expansion into marine, industrial, and energy applications. The business broadened substantially during the twentieth century. It established a machine shop at Cathcart in 1886 and produced munitions, aero-engines, and complete aircraft during the First World War. More than 1,100 aircraft were reportedly completed during the conflict, including Royal Aircraft Factory F.E.2 aircraft. In the interwar period, the wider Weir family and company supported aviation experimentation, including the Cierva Autogiro Company and the development of the W.9 experimental helicopter during the Second World War. Weir became a public company on the London Stock Exchange in 1946. Its double-acting steam pumps became widely used on British and overseas-built ships, while a series of acquisitions expanded its reach in pumps, condensers, controls, valves, and related engineering products. The company participated in the international pump venture Worthington Weir during the late 1960s and early 1970s. The transaction and associated foreign-currency debt later contributed to severe financial pressure, leading to asset disposals and a financial reorganization in 1981. Control interests acquired during that restructuring included those associated with Derald Ruttenberg and Jacob Rothschild, while the Weir family remained connected with the company through its leadership and board history. During the late twentieth and early twenty-first centuries, Weir operated across several industrial sectors, including water treatment, desalination, flow control, oil and gas, power, and mining. It sold its desalination and water-treatment businesses to Veolia in 2005 and Weir Pumps to Clyde Blowers in 2007. The group also developed international relationships in nuclear power and pursued expansion in mining equipment. Its attempted acquisition of Australian mining-equipment company Ludowici in 2012 was unsuccessful, as was its proposed combination with Finnish engineering group Metso in 2014. A downturn in United States shale activity and wider weakness in oil markets led to a profit warning and workforce reductions in 2015, followed by additional oil-and-gas-related cuts later in the decade. Weir subsequently repositioned itself around mining and mineral processing, emphasizing equipment and process technologies intended to improve productivity, energy efficiency, and environmental performance. In 2019 it sold its flow-control division and received a major order for equipment for an iron-ore project in Western Australia. In 2020 it sold its oil-and-gas division to Caterpillar for $405 million, completing a major strategic move toward mining. The modern Weir business is primarily associated with equipment and services used in comminution, slurry transportation, classification, separation, and other stages of mineral processing. Its offerings include pumps, crushers, screens, mills, hydrocyclones, valves, rubber linings, and wear-resistant components, supported by maintenance, digital monitoring, and lifecycle services. The company serves mining operators, mineral processors, original equipment customers, and engineering and construction firms. It withdrew from operations in Russia in 2022 following the Russian invasion of Ukraine and entered an alliance with Swiss Tower Mills Minerals to market vertical stirred grinding mills. Weir remains listed in London and is a constituent of the FTSE 100 Index according to the cited reference material.
History
Weir Group traces its origins to 1871, when George and James Weir established G. & J. Weir Ltd. in Scotland. The firm's early engineering work centered on pumps for Clyde shipyards and steamships. Its boiler feedwater pumps and evaporators became important marine products, helping the business build expertise in fluid handling and mechanical engineering. A new machine shop opened at Cathcart in 1886. During the First World War, Weir shifted substantial capacity toward military production, making shells, aero-engines, and complete aircraft. More than 1,100 aircraft were completed by the end of the war, including the Royal Aircraft Factory F.E.2. The company and members of the Weir family also supported aviation research between the wars, including the Cierva Autogiro Company and the W.9 experimental helicopter project in 1943. Weir was listed on the London Stock Exchange in 1946. Its steam pumps became standard or near-standard equipment on many British-built steamships and were also supplied internationally. Expansion followed through acquisitions including Contraflo Condenser & Kinetic Air Pump Co. in 1930, A. G. Mumford in 1933, Catton & Co. in 1958, and the pump section of Alley & MacLellan in 1960. Hopkinsons, a valve and controls manufacturer based in Huddersfield, was acquired in 1989. The company's participation in Worthington-Simpson produced a major financial challenge. After Studebaker-Worthington acquired Worthington-Simpson in 1969, Weir acquired a 50% interest and created Worthington Weir as a joint venture for international sales. Debt associated with the transaction was denominated in Deutsche Marks and became more expensive as the currency strengthened. The resulting burden led to asset disposals and financial reorganization in 1981. Derald Ruttenberg and Jacob Rothschild acquired effective control of approximately 40% during the restructuring, and Ruttenberg joined the board. The 3rd Viscount Weir, who had become chairman in 1972, moved to the vice-chairmanship before returning to the chair in 1983 and remaining there until 1999. In the twenty-first century, Weir reduced its exposure to non-core activities. It sold Weir Westgarth, Weir Entropie, and Weir Envig to Veolia in 2005, and sold Weir Pumps to Clyde Blowers in 2007. The group retained engineering capabilities in pumps and related technologies while developing stronger positions in mining and mineral processing. Its 2010 cooperation agreement with Mitsubishi Heavy Industries covered pumps for new nuclear power stations. The company faced a major compliance scandal involving alleged payments connected with Iraq. In December 2010, it pleaded guilty to violating United Nations sanctions in force against Iraq between 2000 and 2002. The Scottish High Court imposed a £3 million fine and ordered confiscation of £13.9 million. Weir continued operating in Iraq after the judgment. Mining became increasingly important as the company responded to changes in energy and industrial markets. Weir unsuccessfully bid for Ludowici in 2012 and pursued a proposed merger with Metso in 2014. A contraction in the United States shale market produced a 2015 profit warning and approximately 650 planned job reductions; further reductions followed during the prolonged oil-market downturn. In 2019, Weir sold its flow-control division to First Reserve and won a reported £100 million order for an iron-ore project in Western Australia. The group subsequently made a decisive strategic shift toward mining. In October 2020, it sold its oil-and-gas division to Caterpillar for $405 million. The transaction removed a major source of oilfield exposure and left mining equipment and mineral-processing technology as the core of the business. In 2022, Weir announced its withdrawal from Russia following the invasion of Ukraine and formed a marketing alliance with Swiss Tower Mills Minerals for vertical stirred grinding mills. The company remains a London-listed Scottish engineering group whose principal activities are focused on equipment, technology, aftermarket support, and process improvement for mining customers.
- 2022
Russia withdrawal and grinding alliance
[1]Weir announces its withdrawal from Russia and forms an alliance with Swiss Tower Mills Minerals.
- 2020
Oil-and-gas division sold to Caterpillar
[1]The sale for $405 million consolidates Weir's strategic focus on mining.
- 2019
Flow-control division sold
[1]Weir sells its flow-control division to First Reserve while securing a major Western Australian iron-ore equipment order.
- 2015
Shale downturn triggers workforce reduction
[1]Weakness in the US shale market leads to a profit warning and planned reductions of approximately 650 employees.
- 2010
Iraq sanctions case concluded
[1]Weir pleads guilty to breaching United Nations sanctions imposed on Iraq and receives fines and a confiscation order.
- 2007
Weir Pumps sold
[1]The Glasgow-based pump business is sold to Clyde Blowers and later renamed Clyde Pumps.
- 2005
Desalination businesses sold
[1]Weir sells Weir Westgarth, Weir Entropie, and Weir Envig to Veolia Water Systems.
- 1981
Financial reorganization
[1]Currency-related debt connected with Worthington-Simpson contributes to restructuring and asset disposals.
- 1969
Worthington Weir joint venture created
[1]Weir acquires a 50% interest in Worthington-Simpson and establishes Worthington Weir for international sales.
- 1946
Listed on the London Stock Exchange
[1]Weir becomes a publicly listed company in London.
Products and positioning
Specialist mining-equipment and mineral-processing technology provider focused on reliability, wear life, productivity, energy efficiency, and lifecycle support.
Mining pumps
Warman slurry pumps
Heavy-duty centrifugal slurry pumps used to transport abrasive and high-density mineral slurries in mining and mineral-processing operations. The line is associated with wear-resistant designs and applications such as mill discharge, mineral separation, tailings, and concentrator services.
Crushing, screening, and comminution equipment
Enduron
A family of mineral-processing equipment covering comminution and screening applications. Enduron products are intended to help mines reduce material size, classify feed, and improve plant throughput while controlling maintenance and energy requirements.
Classification equipment
Cavex hydrocyclones
Hydrocyclones used to separate particles in mineral-processing circuits. Their applications include classification around grinding circuits and the separation of solids from liquids, where consistent performance and resistance to abrasive service are important.
Mining pumps
GEHO positive displacement pumps
Positive displacement pumping systems designed for demanding duties such as long-distance slurry transport, tailings handling, and high-pressure mineral-processing applications. The equipment is supplied with engineering and service support for mine-site operating conditions.
Wear-resistant materials
Linatex wear-resistant products
Rubber linings, hoses, and other wear-resistant products used to protect mineral-processing equipment from abrasion and corrosive slurry. These products support longer component life and reduced maintenance in pumps, chutes, pipes, and processing circuits.
Controversies
2010
Iraq sanctions violations
Following allegations concerning payments connected with Saddam Hussein's Iraq, Weir Group pleaded guilty to breaching United Nations sanctions imposed on Iraq between 2000 and 2002. The Scottish High Court imposed a £3 million fine and a £13.9 million confiscation order.
Brand decisions
2022
Withdrawal from RussiaStrategyBackground
The Russian invasion of Ukraine changed the operating and compliance environment for international companies.
Action taken
Weir announced that it was withdrawing from business activities in Russia.
Aftermath
The group reduced its direct business exposure to Russia.
2020
Concentration on miningStrategyBackground
Losses and prolonged weakness in US-centric oil-and-gas activities encouraged Weir to refocus on mining and technologies intended to reduce environmental impact.
Action taken
Weir sold its oil-and-gas division to Caterpillar.
Aftermath
The transaction left mining equipment and mineral-processing technology as the group's central strategic focus.
Sale consideration. $405 million (2020)
2014
Attempted Metso combinationM&ABackground
Weir sought a larger position in international mining and engineering markets through a proposed combination with Metso.
Action taken
Weir approached Metso regarding a merger and later pursued a reported £3.7 billion takeover bid.
Aftermath
Metso's board rejected the proposal and the transaction did not proceed.
Reported proposed takeover value. (2014)
- Metso — Metso's board unanimously rejected the proposed combination.
2005
Exit desalination and water treatmentStrategyBackground
Weir reviewed its portfolio and decided to dispose of several water-related businesses.
Action taken
The group sold Weir Westgarth, Weir Entropie, and Weir Envig to Veolia Water Systems.
Aftermath
The divestment reduced Weir's presence in desalination and water treatment.
Recent events
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