The 3M Company, formerly known as the Minnesota Mining and Manufacturing Company, is an American multinational conglomerate corporation operating in the fields of industry, health care, and consumer goods. The company produces a variety of products, including adhesives, abrasives, laminates, passive fire protection, personal protective equipment, dental and orthodontic products, electronic materials, medical products, car-care products, electronic circuits, healthcare software and optical films. It is based in Maplewood, Minnesota, a suburb of St. Paul.In 2017, 3M made $31.7 billion in total sales. The company has 91,000 employees and has operations in more than 70 countries.

A. O. Smith Corporation is an American manufacturer of both residential and commercial water heaters and boilers. It is the largest manufacturer and marketer of water heaters in North America. It also supplies water treatment products in the Asian market. The company has 24 locations worldwide, including five manufacturing facilities in North America, as well as plants in Nanjing, China and Veldhoven, The Netherlands.In the past, A. O. Smith has had numerous other product lines. Among them, it was the largest bomb maker in the United States by the end of World War I. Smith ranked 74th among United States corporations in the value of World War II military production contracts.

Aalberts Industries N.V. is a Dutch manufacturer of self-described "mission-critical systems", founded by Jan Aalberts in 1975. It is now based in over 50 countries. It is a public company.

AAON Inc. (NASDAQ: AAON) designs, manufactures and sells semi-custom heating, ventilation and air conditioning equipment (HVAC) for commercial and residential use. Primarily, it "“makes and sells air conditioning and heating equipment for the new construction and replacement markets.”AAON Inc. was founded by Norm Asbjornson in 1987, when he purchased the air conditioning and heating division of John Zink. Asbjornson became both founding president and CEO. As of June 2016, AAON employed 1,300 people at its headquarters in Tulsa, Oklahoma. It also employed approximately 300 people in Longview, Texas, with around $358 million in annual sales.The company broke ground on a new R&D lab in Tulsa on February 25, 2016. At the time, AAON was also expanding its manufacturing facility nearby. The research lab will reportedly cost US $33 million, and will be ready in 2019.Its subsidiary, AAON Coil Products manufactures a variety of heating/cooling products, as well as, coils used in the heating, ventilation, and air conditioning (HVAC) industry and provides coils to AAON as well as to other customers.

ABB (ASEA Brown Boveri) is a Swedish-Swiss multinational corporation headquartered in Zürich, Switzerland, operating mainly in robotics and the power and automation technology areas. It ranked as the 286th largest company by revenue for 2016 in the Fortune Global 500 list. ABB is one of the largest engineering companies as well as one of the largest conglomerates in the world. ABB has operations in around 100 countries, with approximately 132,000 employees in December 2016. ABB is traded on the SIX Swiss Exchange in Zürich, Nasdaq Stockholm and the New York Stock Exchange in the United States.

ABUS(August Bremicker Söhne KG) is a company based in Wetter-Volmarstein. It is a German manufacturer of preventative security technology as well as a market leader in bike locks. The name is an acronym formed from the original company name August Bremicker und Söhne.

Accuride Corporation (Indiana), an unrelated company, is a manufacturer of vehicle wheels.Accuride International Inc. is a manufacturer of commercial-grade drawer slides, linear track systems, and electronic locking solutions for cabinetry in commercial, residential and industrial applications, based in Santa Fe Springs, California and has about 2000 employees.Accuride components can be found in major appliances, electronic enclosures, automobiles, office and residential fixtures, and industrial hardware. Accuride currently holds nearly 400 enforceable patents related to movement and access control solutions worldwide. The company is headquartered in Santa Fe Springs, Calif., and has manufacturing facilities in North America, Europe, and Asia. Accuride has about 1,000,000 square feet of manufacturing space in China, Germany, Japan, Mexico, the UK, and the US. Its manufacturing plant in Charlotte, North Carolina, United States closed in 2001.

Accutone Technologies Limited is a manufacturer and marketer of telephone headsets for call centers, and premium-grade consumer audio headphones for smartphones and music-playing devices. A UK brand with headquarters in Spain, Mexico, Hong Kong, and manufacturing facilities in China, Accutone also builds ODM headsets for UK telecom companies, as well as telco in S.America and US. Its mother company started out manufacturing loudspeakers in 1969, Accutone has been in the field of electro-acoustics for more than 45 years. Aside from being one of the big four business headset brand globally, Accutone has begun building a wide range of pro-grade audio headphones for consumers since 2011.

Acromag, Inc. manufactures embedded computing, process instrumentation, and distributed I/O products. Established in 1957, Acromag built its reputation designing critical measurement instrumentation equipment for the petrochemical and aerospace industries. It has since been a designer of analog and digital control products for the industrial I/O market. Acromag's experience in designing industrial I/O has paved the way for solutions to ground loops, RFI/EMI noise, and temperature drift. Many products are available with agency approvals such as UL, cUL, FM, CSA, CE, ATEX, and others to assure precise operation in hostile environments. The company has three product divisions: Embedded Computing Solutions, Process Control and Automation Solutions and Contract Manufacturing Services. Its product lines are aimed at manufacturing, military, scientific, public utility, and transportation applications.

Acuity Brands, Inc. is a lighting and building management firm headquartered in Atlanta, GA., with operations throughout North America and in Europe and Asia. It currently has about 13,000 employees and recorded net sales of $3.7 billion for fiscal year 2018. In terms of market share, Acuity Brands is the largest lighting manufacturer in North America.