Marmon Group
A privately held, diversified industrial group owned by Berkshire Hathaway.
Last updated August 31, 2026
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Overview
Marmon Group is a privately held American industrial holding company headquartered in Chicago, Illinois. It operates through a collection of manufacturing and service businesses rather than through a single consumer-facing product line. Its activities span transportation equipment, electrical and industrial components, construction-related services, retail services, food-service equipment, and other specialized industrial products. The group traces its origins to 1953, when Jay Pritzker and Robert Pritzker acquired Colson Corporation, a struggling manufacturer whose activities included casters, bicycles, naval rockets, and wheelchairs. The acquisition provided the Pritzker family with a platform for building a diversified industrial portfolio. In 1964, following the acquisition of Marmon-Herrington, the company adopted the Marmon Group name. The Marmon identity subsequently became associated with a decentralized approach to industrial management, in which operating companies retained substantial responsibility for their own businesses and markets. Marmon expanded through acquisitions across unrelated but often specialized industrial fields. Notable additions included Cerro Corporation in 1976 and TransUnion in 1981. These transactions reflected a strategy of assembling businesses with established positions in infrastructure, components, transportation, and services rather than concentrating on one manufacturing category. Tank-car manufacturing became one of the group's most identifiable activities. Union Tank Car Company serves the United States, while Procor operates in Canada, together forming an important North American rail-equipment presence. Berkshire Hathaway began acquiring control of Marmon in 2007. In 2008, Berkshire acquired a 63.6 percent interest from the Pritzker family for $4.8 billion, with an agreement and plan to purchase the remaining stake over the following several years. Berkshire completed the acquisition of the outstanding interest in 2013, making Marmon a wholly owned member of the Berkshire Hathaway group. Under Berkshire ownership, Marmon has continued to function as a diversified industrial group with multiple operating companies and business lines. Its portfolio orientation gives it exposure to recurring industrial demand, transportation infrastructure, electrical equipment, construction activity, and commercial services. The company is therefore better understood as a house of industrial businesses than as a conventional product brand. Its operating markets include the United States, Canada, and other international markets served by its subsidiaries and business units.
History
Marmon Group began in 1953 when Jay Pritzker and Robert Pritzker acquired Colson Corporation. At the time, Colson was a financially troubled manufacturer with a varied product base that included casters, bicycles, naval rockets, and wheelchairs. The purchase established the Pritzker family's presence in industrial manufacturing and created the foundation for a broader acquisition-led enterprise. The company changed its name to Marmon Group in 1964 after acquiring Marmon-Herrington. The new name reflected the growing importance of the Marmon-Herrington business and marked the evolution of the company from a single acquired manufacturer into a diversified industrial organization. Rather than focusing on one end market, the group developed a portfolio of businesses operating in specialized manufacturing and service niches. Marmon pursued significant acquisitions during the following decades. Cerro Corporation joined the group in 1976, adding another industrial business to the portfolio. In 1981, Marmon acquired TransUnion. These transactions illustrate the breadth of the group's strategy: its holdings could include businesses with different products, customers, and operating models, provided they occupied established industrial or service positions. Transportation equipment became a particularly important part of Marmon's activities. Its rail operations include Union Tank Car Company in the United States and Procor in Canada. Tank cars are used to transport bulk liquids and other materials by rail, placing these businesses within the broader North American transportation and industrial-infrastructure system. Alongside rail equipment, Marmon's portfolio came to include electrical components, other industrial products, and service businesses connected with construction and retail markets. Berkshire Hathaway became involved in Marmon in 2007 by acquiring a controlling interest. In 2008, Berkshire purchased 63.6 percent of Marmon from the Pritzker family for $4.8 billion. The transaction was structured with the intention that Berkshire would acquire the remaining 36.4 percent over approximately five to six years. Berkshire completed that process in 2013, after which Marmon became wholly owned by Berkshire Hathaway. The Berkshire transaction represented a major change in ownership but not a conversion of Marmon into a conventional centralized operating company. Marmon continued to be characterized by a portfolio of operating businesses serving specialized markets. Its principal identity remains that of an industrial holding group with exposure to transportation equipment, electrical and industrial components, construction and retail services, food-service equipment, and related activities. Because the group encompasses many subsidiaries and business lines, its history is best understood as the accumulation and management of specialized industrial enterprises under a common ownership structure.
- 2013
Berkshire Hathaway became sole owner
[1]Berkshire Hathaway completed the purchase of Marmon's remaining interest and became its sole owner.
- 2008
Berkshire Hathaway acquired a majority stake
[1]Berkshire Hathaway acquired a 63.6 percent interest in Marmon from the Pritzker family for $4.8 billion, with plans to purchase the remaining interest.
- 2007
Berkshire Hathaway acquired control
[1]Berkshire Hathaway began its acquisition of Marmon by obtaining a controlling interest.
- 1981
TransUnion acquired
[1]Marmon acquired TransUnion, adding a major service-oriented business to its portfolio.
- 1976
Cerro Corporation acquired
[1]Marmon expanded its diversified industrial portfolio through the acquisition of Cerro Corporation.
- 1964
Company renamed Marmon Group
[1]Following the acquisition of Marmon-Herrington, the company adopted the Marmon Group name.
- 1953
Colson Corporation acquired
[1]Jay Pritzker and Robert Pritzker acquired Colson Corporation, establishing the industrial platform that later became Marmon Group.
Products and positioning
A decentralized, diversified industrial holding group serving transportation, infrastructure, manufacturing, construction, retail, and commercial-service markets.
Rail transportation equipment
Union Tank Car Company
Union Tank Car Company is Marmon's United States rail-equipment business. It manufactures and supplies railroad tank cars used for the bulk transportation of liquids and other industrial materials, making it a significant part of Marmon's transportation-equipment portfolio.
Rail transportation equipment
Procor
Procor is Marmon's Canadian rail-equipment business. It is associated with the manufacture and supply of tank cars and related rail transportation services for the Canadian market.
Industrial components
Electrical components
Marmon companies produce electrical components and related industrial equipment for commercial, infrastructure, and manufacturing applications. The group presents these activities as part of a broad portfolio rather than as one unified consumer product line.
Industrial and commercial services
Construction and retail services
Marmon's portfolio includes service businesses supporting construction and retail markets. These activities complement its manufacturing operations and extend the group into recurring commercial and infrastructure-related services.
Commercial equipment
Food-service equipment
Food-service equipment is among the commercial product categories represented within Marmon's diversified operating portfolio. The category covers equipment supplied to professional food-service environments.
Brand decisions
2013
Berkshire Hathaway completed the Marmon acquisitionM&ABackground
After acquiring a majority interest, Berkshire Hathaway pursued the remaining Marmon shares under the planned multi-year ownership transition.
Action taken
Berkshire Hathaway acquired the remaining 36.4 percent interest and became Marmon's sole owner.
Aftermath
Marmon continued operating as a diversified industrial group within Berkshire Hathaway's portfolio of wholly owned businesses.
2008
Berkshire Hathaway purchased a majority interestM&ABackground
Berkshire Hathaway had acquired control of Marmon in 2007 and then structured a larger transaction with the Pritzker family.
Action taken
Berkshire Hathaway bought a 63.6 percent stake in Marmon for $4.8 billion and announced an intention to acquire the remaining interest over the following years.
Aftermath
The transaction placed Marmon within the Berkshire Hathaway group while leaving the planned purchase of the remaining stake for a later stage.
Acquisition consideration. $4.8 billion for a 63.6 percent interest (2008)
Recent events
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