Parker-Hannifin Corporation, originally Parker Appliance Company, usually referred to as just Parker, is an American corporation specializing in motion and control technologies. Its corporate headquarters are in Mayfield Heights, Ohio, in Greater Cleveland (with a Cleveland mailing address)." CERTIFICATE OF PROPERTY INSURANCE". Parker Hannifin. March 28, 2012. Retrieved on December 25, 2012. "Parker Hannifin Corporation 6035 Parkland Blvd Cleveland OH 44124-4141 USA"." 2010 CENSUS – CENSUS BLOCK MAP: Mayfield Heights city, OH" () U.S. Census Bureau. Retrieved on December 25, 2012.
The company was founded in 1917 and has been publicly traded on the New York Stock Exchange since December 9, 1964. The firm is one of the largest companies in the world in motion control technologies, including aerospace, climate control, electromechanical, filtration, fluid and gas handling, hydraulics, pneumatics, process control, and sealing and shielding. Parker employs about 61,000 people globally.
In 2024, the company was ranked 216 in the Fortune 500.
By 1927, the firm had expanded into airplanes. For his flight across the Atlantic Ocean, Charles Lindbergh requested Parker parts be used in the construction of his aircraft the Spirit of St. Louis. The firm contributed the system that linked the aircraft's 16 fuel tanks.
During World War II, Parker experienced a boom in business as the U.S. Air Force's primary supplier of valves and fluid connectors. By 1943, the firm employed 5,000 Cleveland, Ohio, residents. After Arthur Parker's death in 1945 and the end of the war, the company neared bankruptcy due to the sudden drop in demand. Arthur Parker's wife, Helen Parker, assumed control of the company and prevented its liquidation. She hired new management staff and directed the company's focus back to civilian manufacturing.
In 1953, Arthur Parker's son Patrick S. Parker began working full-time at the company. He rose to become its president in 1968,
The company debuted on the New York Stock Exchange in 1964, under the ticker symbol PH. In 1966, the company joined the Fortune 500. The company designed parts for the craft used in NASA first crewed Moon landing in 1969.
In 1982, Paul G. Schloemer replaced Patrick Parker as the company's president (although Patrick Parker remained chairman and CEO). That same year, the firm entered the Mexican market. By 2008, Parker Hannifin Mexico would come to operate 11 plants in the country, seven of which made parts exclusively for the U.S. market. In 1988, the company reached $2 billion in sales.
The firm opened its first retail "ParkerStore" in Cleveland in 1993. Within 10 years, the network of stores expanded to 200 locations in the U.S. and more than 400 worldwide. ParkerStores offer a variety of Parker products, including hydraulics, automation, and hose and fitting components, at locations close to industrial product buyers. Parker Hannifin systems helped control the massive replica of the Titanic in the 1997 film of the same name. In 1997, the firm moved its headquarters from Cleveland to a new building in Mayfield Heights, a suburb of Cleveland. In 1999, the company's sales reached approximately $5 billion.
In 2001, CEO Don Washkewicz introduced lean startup methods to company operations and has said that over the decade this reduced the time to obtain price quotes by 60% and cut product development lead times by 25%.
In 2002 the company appointed Craig Maxwell as head of engineering; Maxwell brought a focus on innovation as well as rigor; he argued for and was given a $20M annual budget to fund blue sky inventions made by engineers and has given engineers time to pursue them; at the same time his team developed software that allows tracking each of the company's 1700 ongoing R&D projects graded by risk and potential reward, and closely managing their progress. In 2011 he hired Ryan Farris out of Vanderbilt University and licensed patents covering a powered exoskeleton that Farris had worked on at Vanderbilt. In 2015 the company opened an internal business incubator that Maxwell had proposed when he was first hired.
The company won $2 billion in contracts to build fuel and hydraulic systems for Airbus A350 airliners in 2008 Two years later, its products were used in repairing the Deepwater Horizon oil rig.
Thomas Williams took over the CEO role from Washkewicz in 2015. In 2016, the company completed its largest acquisition to date, buying Clarcor, a filtration systems manufacturer, for $4.3 billion. In 2019, Parker bought Lord Corporation for $3.7 billion and Kent, WA based Exotic Metals Forming Company for $1.7 billion.
In August 2021, the company agreed to buy British aerospace and defense company Meggitt for £6.3 billion. In July 2022, after making commitments to the UK government including increasing research and development spending in Britain, the Secretary of State for Business, Energy and Industrial Strategy approved the takeover without being referred for a full Competition and Markets Authority investigation. The acquisition completed in September 2022.
In May 2022, it was announced Parker Hannifin has sold its aircraft wheel and brake division to the Bloomfield-headquartered aerospace company, Kaman Corporation for US$440 million.
In November 2025, Parker Hannifin announced a deal to buy Filtration Group—a privately held filtration-technologies manufacturer—for $9.25 billion. The deal is expected to create one of the largest industrial filtration businesses in the world.
In 1993, the Federal Aviation Administration contracted Parker Aerospace to develop a new monitoring device, the Multi-Sensor Enroute Flight Inspection System, for flight inspection aircraft.
Notable acquisitions by the division include the Kalamazoo, Michigan-based Abex/NWL division of Pneumo Abex in 1996, and Naples, Florida-based Shaw Aero Devices, in 2007. In 2012, the company partnered with General Electric to form a 50–50 joint venture, Advanced Atomization Technologies, for producing fuel nozzles for commercial aircraft engines.
In 2004, a Los Angeles jury ordered Parker Hannifin to pay US$43 million to the plaintiff families of the 1997 SilkAir Flight 185 crash in Indonesia. Parker Hannifin subsequently appealed the verdict, which resulted in an out-of-court settlement for an undisclosed amount. The Indonesian National Transportation Safety Committee (NTSC) could not determine the cause of the crash due to the near total lack of physical evidence because of the complete destruction; The US National Transportation Safety Board (NTSB), however disagreed, and concluded that the crash was caused, possibly intentionally, by the pilot.
The FAA ordered an upgrade of all Boeing 737 rudder control systems by November 12, 2002. The firm argued that the components they supplied were not at fault, citing that the product has one of the safest records in its class, but the FAA directive went through regardless. In 2016, former NTSB investigator John Cox stated that time has proven the NTSB correct in its findings that the valve was faulty, because no additional rudder-reversal incidents have occurred since Boeing's redesign.
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