| Company type | Public |
|---|---|
| Industry | Engineering |
| Founded | 1871 |
| Headquarters | Glasgow,Scotland,UK |
Key people | Charles Berry, (Chairman) Jon Stanton, (CEO) William Weir, 3rd Viscount Weir, (Former Chairman) |
| Revenue | |
Number of employees | 12,000 (2025)[2] |
| Website | www.global.weir |
TheWeir Group plc is a Scottish multinational engineering company headquartered inGlasgow,Scotland. It is listed on theLondon Stock Exchange and is a constituent of theFTSE 100 Index.

The company was established in 1871 as an engineering firm by two brothers, George and James Weir, foundingG. & J. Weir Ltd.[3] The Weir brothers produced numerous groundbreaking inventions in pumping equipment, primarily for the Clyde shipyards and the steam ships built there. These pumps became extremely well known for their use asboiler feedwater pumps, and for ship's auxiliary equipment such asevaporators.[4]
During 1886, the company established a new machine shop inCathcart alongside a recently extended railway line.[5] Under the leadership ofW D Weir, the company turned to producing munitions and warmateriel during theFirst World War. In addition to shells, it manufactured aero-engines and whole aircraft, including theRoyal Aircraft Factory F.E.2 fighter and bomber.[6] By the end of the conflict, in excess of 1,100 aircraft had been completed by the firm.[5]
In 1930 the company acquired Contraflo Condenser & Kinetic Air Pump Co, Westminster, in 1933 A. G. Mumford, Colchester, in 1958 Catton & Co (merged into Weir-Catton) and in 1960 the pump section ofAlley & MacLellan, Polmadie.[7]
During theinterwar period,James George Weir (aviator, son ofJames Galloway Weir) a director of the company formed theCierva Autogiro Company. G & J Weir would be a financial supporter of the company during its existence.[8] In 1943, the firm provided the finances for the construction of theW.9, an experimental helicopter, toAir Ministry requirements.[9]
The company wasfirst listed on the London Stock Exchange in 1946.[3] By this time, double-acting Weir steam pumps had become virtually standard fitment on British-builtsteamships, being used for pumping water, fuel, air and numerous other materials, as well as being widely used on numerous foreign-built ships, well into the 1950s.[10]
In December 1968, Weir Group issued an offer to purchase the rival British pump manufacturerWorthington-Simpson, following an offer byStudebaker-Worthington.[11] During 1969, Studebaker-Worthington acquired Worthington-Simpson.[12] After some negotiation, Weir's acquired 50% of Worthington Simpson.[13] A new joint-venture company named Worthington Weir was set up to handle international sales of the two parent companies.[14] The debt taken on by Weir to acquire their share of Worthington-Simpson was denominated inDeutsche Marks, and as that currency strengthened against both theSterling and theDollar, it became increasingly expensive to service.[15] While Worthington-Simpson was a profitable venture, it did not cover the cost of this debt.[16]
In response to the company's debt burden, Weir Group was compelled to sell off numerous assets and undertook financial reorganization in 1981.[17] Following this reorganization,Derald Ruttenberg andJacob Rothschild gained effective control of 40% of the company; Ruttenberg became a board member.[18] Amid the reorganization, the3rd Viscount Weir, who had been chairman since 1972, stepped down to vice chairman. However, Lord Weir regained the chairmanship in 1983 and served in this role until 1999.[19]
During 1989, the company acquired Hopkinsons, anHuddersfield-based company manufacturing valves and controls.[20][21]

During July 2005, Weir sold itsdesalination and water treatment businesses, (Weir Westgarth, Weir Entropie and Weir Envig) toVeolia Water Systems, part of the water division ofVeolia Environnement: Weir Westgarth had been a pioneer of themulti-stage flash distillation process used predominantly to produce desalinated water fromseawater.[23] During May 2007, the company sold itsGlasgow-based businessWeir Pumps toJim McColl'sClyde Blowers plc, with the pump company subsequently being renamed to Clyde Pumps Ltd.[24][25]
In early 2006, it was reported that, amid allegations that the company had paid a multi-million poundbribe toSaddam Hussein'sIraq, Weir Group acknowledged that it had parted company with several employees over the claims.[26] In December 2010, Weir Group pleaded guilty to breachingUN sanctions imposed on Iraq between 2000 and 2002. Judge Lord Carloway of The High Court in Edinburgh fined the company £3m along with a confiscation order of £13.9m.[27][28] Following this judgement, the company continued to operate in Iraq.[29]
In 2010, Weir Group formed an agreement with the Japanese conglomerateMitsubishi Heavy Industries to cooperate on pump-related work on newnuclear power stations.[30]
During August 2011, the company announced record profits of £178 million, having risen during the first six months of the year by 24%; orders were also up substantially.[31] One year later, the firm was involved in a bidding war for the Australian mining company Ludowici, but was ultimately outbid by the Danish engineering firm FLSmidth.[32][33]
In 2014, Weir Group sought to discuss an envisioned merger between itself and the Finnish engineering firmMetso Corporation; however, the board of the latter unanimously rejected the initiative.[34] A £3.7 billion bid to takeover Metso was similarly unsuccessful.[35][36]
During February 2015, the company issued aprofit warning predicting significant losses after the USshale market went through a contraction. In response, Weir Group opted to reduce its workforce by approximately 650.[37][38] Due to the persistence of the oil market's downturn, further jobs cuts followed in late 2019.[39]
In February 2019, the company sold their flow control division toFirst Reserve.[40] That same year, Weir Group was awarded its largest ever order, valued at £100m, to supply mining equipment for a large iron ore scheme in Western Australia.[41][42]
During the late 2010s, Weir Group decided that, following losses in its US-centric oil and gas activities, it would reorient towards the mining industry, for which it was developing new technologies to reduce environmental impact.[43] During October 2020, the company sold their oil and gas division to the American equipment manufacturerCaterpillar Inc. in exchange for $405 million.[44][45]
In April 2022, the company announced that it was withdrawing from its business activities within Russia following theRussian Invasion of Ukraine.[46] That same year, Weir Group formed an alliance with Swiss Tower Mills Minerals AG to market the latter's vertical stirred grinding mills.[47]
| Transaction | Date |
|---|---|
| PurchasedPompe Gabbioneta, anItalian pump manufacturer for £69m in 2005.[48] | 2005 |
| Weir Group acquired SPM Flow Control, Inc for US$653 million (£328 million). SPM manufactures high-pressure well service pumps and related flow control equipment[49] | 2007 |
| Acquired African pumps business, CH Warman Pump Group for $231m (£113m)[50] | 2007 |
| Acquired Mesa Manufacturing Inc, theTexan based pump manufacturer for $40m[51] | 2008 |
| BoughtMalaysia-based Linatex for £138m[52] | 2010 |
| Agreed to acquireIndian valves manufacturing business, BDK Engineering Industries,Hubli[53] | 2010 |
| Announced the acquisition of American Hydro Corporation, a manufacturer of turbines forhydro-electric power stations.[54] | 2010 |
| Weir Group and Shengli Oilfield Highland Petroleum Equipment Co. announced the formation of a joint venture to provide high-pressure well service pumps and related flow control equipment to the developing shale gas industry in China.[55] | 2010 |
| Agreed to acquire a 60% interest in theSouth Korean valves business formerly operated by HIM Tech Co Ltd.[56] | 2011 |
| Purchased Seaboard Holdings Inc a Houston-based wellhead solutions provider for US$675m (£431m)[57] | 2011 |
| Purchased KOP Surface Products, a Singapore provider of advanced pressure control wellhead technologies, systems and services for an enterprise value of US $114m[58] | 2017 |
| PurchasedESCO Corporation, a Portland-based global leader in ground engaging tools for mining and construction markets for an enterprise value of US $1.285 billion[59] | 2018 |
| Purchased Motion Metrics, a leading Canada-based global mining technology business, for an initial consideration of US $119m[60] | 2021 |
| Acquisition of SentianAI, a Swedish-based developer ofartificial intelligence solutions.[61] | 2023 |

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