Mobile Mini
Former American provider of portable storage, mobile offices, and specialty containment solutions.
Last updated August 31, 2026
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Overview
Mobile Mini was an American portable-storage and modular-space company founded in 1983 by Richard Bunger. It began by selling storage containers to construction companies and manufacturers and later developed a large rental, sales, manufacturing, delivery, and customization business. Its core products were welded-steel portable storage containers, ground-level offices, guard shacks, and related modular structures. Units were produced in a range of lengths, from small containers to structures as long as 45 feet, and could be configured for different access, security, office, and site-storage requirements. The company initially operated from Phoenix and expanded into other Southwestern markets during the 1980s. A shortage of available cargo-storage containers led it to begin manufacturing its own units in Phoenix. During the early 1990s, Mobile Mini developed patented locking systems intended to improve container security, including the bi-cam system and later the Tri-Cam system. It also broadened its manufacturing capabilities and built modular classrooms for customers in Arizona and New Mexico. Growth in Texas, including Dallas, Houston, and San Antonio, was followed by acquisitions in Las Vegas and Oklahoma City in 1998. Mobile Mini continued expanding during the 2000s. It entered the United Kingdom through the acquisition of Royal Wolf in 2004 and increased the scale of its rental fleet through a 2008 merger with The Mobile Storage Group. That transaction combined portable-storage and office-rental operations and gave the company a fleet of more than 274,000 units at the time, according to the referenced company history. Mobile Mini’s customer base included construction, manufacturing, retail, education, infrastructure, commercial, and industrial users that needed temporary or relocatable space. The company added specialty containment capabilities in 2014 by acquiring Evergreen Tank Solutions for $405 million in cash. Evergreen supplied tanks, trucks, pumps, filters, and related equipment for liquid and specialty containment applications. In 2015, Mobile Mini sold approximately 9,400 wood mobile offices to Acton Mobile, a move intended to reduce exposure to that product category and concentrate resources on storage and containment. In 2017, the company consolidated its divisions under the Mobile Mini Solutions identity. Its storage and ground-level-office operations were presented as Mobile Mini Storage Solutions, while the former Evergreen Tank and Water Movers activities operated as Mobile Mini Tank + Pump Solutions. Mobile Mini also introduced Mobile Mini Connect in 2017, an online customer-service portal that allowed customers to review account information, manage invoices and forms, administer rentals, and request unit pickups. The company entered into a merger agreement with WillScot Corporation in March 2020. The combined business brought together Mobile Mini’s portable-storage and specialty-containment activities with WillScot’s modular-space rental operations. The transaction was described as having an estimated combined value of approximately $6.6 billion. By 2024, the combined company had rebranded as WillScot Holdings Corp., ending Mobile Mini’s existence as the group’s standalone corporate identity.
History
Mobile Mini, originally called Mobile Mini Storage Systems, was founded in 1983 by Richard Bunger. The business initially sold storage containers to construction companies and manufacturers. It expanded beyond Phoenix by 1986, first concentrating on the Southwestern United States. Because suitable cargo containers were difficult to obtain, the company began manufacturing welded-steel containers in Phoenix, establishing a production base that supported later rental and sales growth. During the early 1990s, Mobile Mini developed patented security technology for its containers, including a bi-cam locking system and, later, a Tri-Cam locking system. The company expanded its manufacturing facilities, introduced additional product configurations, and built modular classrooms for markets in Arizona and New Mexico. It also grew in Texas, particularly in Dallas, Houston, and San Antonio. Acquisitions in Las Vegas and Oklahoma City in 1998 helped extend its regional network. In the early 2000s, Mobile Mini continued to expand its portable-storage and mobile-office business. International growth began in 2004 with the acquisition of Royal Wolf in the United Kingdom and the launch of a Mobile Mini UK website. In 2008, the company merged with The Mobile Storage Group. The combination created a substantially larger portable-storage and office-rental fleet, reported in the source material as exceeding 274,000 units. Erik Olsson became chief executive officer in 2013. In November 2014, Mobile Mini bought Evergreen Tank Solutions for $405 million in cash. Evergreen added liquid and specialty containment services, including tanks, trucks, pumps, and filters, and broadened Mobile Mini beyond conventional storage and office rentals. In spring 2015, Mobile Mini sold about 9,400 wood mobile offices to Acton Mobile. This divestiture reflected a strategic effort to concentrate on its principal storage and containment activities. In 2017, Mobile Mini reorganized its customer-facing identities under the Mobile Mini Solutions umbrella. Storage and ground-level offices were associated with Mobile Mini Storage Solutions, while the specialty-containment operations connected to Evergreen Tank and Water Movers were presented as Mobile Mini Tank + Pump Solutions. That year the company also introduced Mobile Mini Connect, a digital portal for account information, invoices, forms, rental administration, and pickup requests. Mobile Mini’s corporate independence ended through its combination with WillScot. In March 2020, the two companies entered into a merger agreement. The resulting enterprise combined portable storage, modular space, and specialty-containment capabilities and was described as having an estimated value of approximately $6.6 billion. In 2024, the combined company rebranded as WillScot Holdings Corp. Mobile Mini therefore became a former standalone corporate identity within the larger WillScot organization, although its product categories and operating capabilities contributed to the combined company’s broader modular-space and storage platform.
- 2024
Rebrand as WillScot Holdings Corp.
[1]The combined company adopted the WillScot Holdings Corp. name, ending Mobile Mini’s standalone corporate identity.
- 2020
Merger agreement with WillScot
[1]Mobile Mini entered into a merger agreement with WillScot Corporation.
- 2017
Mobile Mini Solutions brand structure
[1]The company unified its divisions under the Mobile Mini Solutions identity and introduced separate storage and tank-and-pump solution groupings.
- 2017
Mobile Mini Connect introduced
[1]The company launched a digital customer-service portal for rental and account-management tasks.
- 2015
Wood mobile-office divestiture
[1]Mobile Mini sold approximately 9,400 wood mobile offices to Acton Mobile.
- 2014
Evergreen Tank Solutions acquisition
[1]Mobile Mini acquired Evergreen Tank Solutions for $405 million in cash, adding liquid and specialty containment capabilities.
- 2013
Erik Olsson appointed CEO
[1]Erik Olsson was appointed chief executive officer.
- 2008
Merger with The Mobile Storage Group
[1]The merger created a combined portable-storage and office-rental fleet reported as exceeding 274,000 units.
- 2004
United Kingdom expansion
[1]Mobile Mini expanded internationally through the acquisition of Royal Wolf in the United Kingdom.
- 1998
Regional acquisitions
[1]The company completed acquisitions in Las Vegas, Nevada, and Oklahoma City, Oklahoma.
Products and positioning
A business-to-business provider of relocatable storage, temporary office space, and specialty containment equipment, emphasizing rental availability, transport, security features, and configurable steel units.
Storage · 1983
Portable storage containers
Welded-steel containers designed for temporary or relocatable storage at construction sites, commercial properties, industrial facilities, and other customer locations. Units were available in multiple lengths, from approximately 5 to 45 feet, and could be modified with different doors, security arrangements, access points, and other configuration options.
Modular space
Ground-level mobile offices
Relocatable office units intended to provide temporary workspace near construction projects, commercial sites, schools, and industrial operations. Mobile Mini’s office offering formed part of its broader portable-storage and modular-space rental platform.
Site infrastructure
Guard shacks and security units
Compact portable structures adapted for security personnel, site access control, and guard-post functions. They were among the custom applications available from Mobile Mini’s steel-unit manufacturing and modification operations.
Specialty containment · 2017
Mobile Mini Tank + Pump Solutions
The specialty-containment division created through Mobile Mini’s Evergreen Tank Solutions and Water Movers activities. It supplied containment tanks and related equipment such as trucks, pumps, and filters for liquid-management and other specialty applications.
Digital customer service · 2017
Mobile Mini Connect
An online customer portal introduced in 2017. It provided access to account information, invoices, forms, rental administration, and requests for unit pickup, extending the company’s service model beyond physical delivery and collection.
Brand decisions
2020
Merge with WillScotM&ABackground
Mobile Mini sought to combine its portable-storage and containment activities with WillScot’s modular-space rental business.
Action taken
Mobile Mini entered into a merger agreement with WillScot Corporation.
Aftermath
The combined company ultimately adopted the WillScot Holdings Corp. name in 2024, and Mobile Mini ceased to operate as the group’s standalone corporate identity.
Estimated value of combined company. Approximately $6.6 billion (March 2020 merger announcement)
2017
Unify operating divisions under Mobile Mini SolutionsStrategyBackground
The company operated across portable storage, ground-level offices, specialty tanks, pumps, and related containment services.
Action taken
Mobile Mini placed its divisions under the Mobile Mini Solutions umbrella, with Mobile Mini Storage Solutions for storage and offices and Mobile Mini Tank + Pump Solutions for specialty containment.
Aftermath
The unified architecture presented the company as a broader solutions provider rather than as separate storage and containment businesses.
2015
Divest wood mobile-office fleetStrategyBackground
Mobile Mini chose to focus more closely on its core storage and containment activities.
Action taken
The company announced the sale of approximately 9,400 wood mobile offices to Acton Mobile.
Aftermath
The divestiture reduced the company’s wood-office exposure and supported concentration on storage and containment products.
2014
Acquire Evergreen Tank SolutionsM&ABackground
Mobile Mini’s established storage and office-rental business was being expanded into adjacent containment services.
Action taken
The company purchased Evergreen Tank Solutions for $405 million in cash, adding tanks, trucks, pumps, filters, and specialty liquid-containment capabilities.
Aftermath
Evergreen-related operations later became part of the Mobile Mini Tank + Pump Solutions structure.
Acquisition consideration. $405 million (November 2014)
Sources2 sources
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