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| NYSE: GY | |
| Industry | Aerospace,Defense |
| Predecessors | |
| Founded | 2013; 13 years ago (2013) |
| Defunct | January 5, 2026 (2026-01-05) |
| Fate | Split intoRocketdyne andL3Harris Missile Solutions |
| Headquarters | , U.S. |
Key people | Kenneth L. Bedingfield (president) |
| Revenue |  US$2.24 billion (2022) |
 US$145 million (2022) | |
| US$74 million (2022) | |
| Total assets | US$2.37 billion (2022) |
| Total equity | US$541 million (2022) |
Number of employees | 5,283 (2022) |
| Parent | L3Harris |
| Footnotes / references [1][2] | |
Aerojet Rocketdyne was a company, and later asubsidiary of Americandefense companyL3Harris, that manufactured rocket,hypersonic, and electric propulsive systems for space, defense, civil and commercial applications.[3][4][2]Aerojet traced its origins to theGeneral Tire and Rubber Company (later renamed GenCorp, Inc. as it diversified) established in 1915, whileRocketdyne was created as a division ofNorth American Aviation in 1955.[5][6] Aerojet Rocketdyne was formed in 2013 when Aerojet andPratt & Whitney Rocketdyne were merged, following the latter's acquisition by GenCorp, Inc. fromPratt & Whitney.[7][8] Aerojet Rocketdyne was acquired by L3Harris in July 2023 for $4.7 billion. In 2026, L3Harris agreed to sell the "Space Propulsion and Power Systems" sector of Aerojet Rocketdyne toAE Industrial Partners, who willspin off the business under the name "Rocketdyne",[9] and to hold anIPO for the remaining "Missile Systems" sector.[10]
Several decades after it began manufacturing rubber products, General Tire & Rubber diversified into broadcasting and aeronautics.
In the 1940s, theAerojet company began experimenting with various rocket designs. For a solid-fuel rocket, they needed binders, and turned to General Tire & Rubber for assistance. General became a partner in the company.
Radio broadcasting began with the purchase of several radio networks starting in 1943. In 1952, its purchase ofWOR-TV expanded the broadcast business into television. In 1953, General Tire & Rubber bought theRKO Radio Pictures movie studio.[11] All of its media and entertainment holdings were organized into the RKO General division.
Due to the studio and rocket businesses, General Tire & Rubber came to own a great deal of property in California. Its internal facilities management unit began commercializing its operations, landing General Tire & Rubber in the real estate business. This started when Aerojet-General Corporation acquired approximately 12,600 acres (51 km2) of land in Eastern Sacramento County. Aerojet converted these former gold fields into one of the premier rocket manufacturing and testing facilities in the Western world. However, most of this land was used to provide safe buffer zones for Aerojet's testing and manufacturing operations. Later, as the need for these facilities and safety zones decreased, the property became available for other uses. Located 15 miles (24 km) northeast of Sacramento alongU.S. Highway 50, the properties were valuable, being in a key growth corridor in the region. Approximately 6,000 acres (24 km2) of the Aerojet lands are now being planned as a community called Easton. Easton Development Company LLC was formed to assist in the process.[12]
In 1955,North American Aviation spun offRocketdyne, a developer of rocket motors that built upon research conducted into the GermanV-2 Rocket after World War II. Rocketdyne would become a major supplier forNASA, producing theRocketdyne F-1 engine for theSaturn V rocket of theApollo Space Program as well as theRS-25 engine of theSpace Shuttle program and its successor theSpace Launch System (SLS) program.
Aerojet Rocketdyne engines have contributed to every successfulNASA Mars mission, including powering the launch, entry, descent, and landing phases of thePerseverance rover mission.[13]
In 1984, General Tire created a parent holding company,GenCorp, Inc., for its various business ventures.
The main subsidiaries were:
Through its RKO General subsidiary, the company also held stakes in:
Faced with ahostile takeover attempt, among other difficulties, GenCorp, Inc. shed some of its long-held units in the late 1980s.
RKO General ran into difficulties with theFederal Communications Commission (FCC) during license renewal proceedings in the late 1980s. The FCC was reluctant to renew the broadcast licenses, due to widespread lying to advertisers and regulators. As a result of the protracted proceedings, GenCorp sold RKO General's broadcast properties beginning in 1987.
GenCorp, Inc. also sold its former flagship, General Tire, toGerman tire manufacturerContinental AG in order to concentrate on Aerojet.
In 1999, GenCorp, Inc. spun off its Decorative & Building Products and Performance Chemicals businesses. GenCorp, Inc. formedOMNOVA Solutions Inc. into a separate, publicly traded company, and transferred those businesses into it.
GenCorp, Inc.'s two remaining businesses, as of 2008, wereAerojet and Easton Real Estate.[14]
GenCorp, Inc. withdrew its over-funded pension during the real estate boom years of 2006 and 2007. The real estate bust caused an underfunding of the pension plan of over $300 million. This caused a freeze of its pension plan on February 1, 2009, and an end to401(k) match on January 15, 2009. The move was expected to save the company $29 million a year.[15]
In March 2008, hedge fund Steel Partners II, which owned 14% of GenCorp, Inc., made an agreement that saw Terry J. Hall step down as CEO and gave Steel Partners II control of three board seats plus the selection of the new CEO (who would also hold a board seat). Steel Partners II had previously attempted ahostile takeover in 2004, and forced the deal after complaining about "significant underperformance and deterioration of share price". Aerojet President J. Scott Neish was named interim CEO.[16]
In January 2010, Scott Seymour, the former head of Northrop Grumman Integrated Systems from 2002 to 2008, was appointed permanent CEO of GenCorp, Inc. and Neish resigned.[17]
In July 2012, GenCorp, Inc. agreed to buy rocket engine producerPratt & Whitney Rocketdyne fromUnited Technologies Corporation for $550 million.[18][19][20] The FTC approved the deal on June 10, 2013, and it closed on June 17.[21][22][23][24] GenCorp, Inc. was later renamedAerojet Rocketdyne Holdings, Inc on April 27, 2015.[25]
On December 20, 2020, it was announced thatLockheed Martin would acquire the company for $4.4 billion.[26] The acquisition was expected to close in first quarter of 2022,[27] but this received opposition fromRaytheon Technologies. Later theFTC sued to block this deal on a 4–0 vote in January 2022 on grounds that this would eliminate the largest independent maker of rocket motors[28][29] and Lockheed subsequently abandoned the deal in February 2022.[30][31]
In December 2022,L3Harris Technologies agreed to buy the company for $4.7 billion in cash.[32] The acquisition was completed in July 2023.[33] L3Harris named formerCTO Ross Niebergall as president of the new Aerojet Rocketdyne business segment,[2] which would now be headquartered inPalm Bay, Florida.[34]
In January 2026, L3Harris agreed to sell a majority stake in the Aerojet Rocketdyne "Space Propulsion and Power Systems" sector toAE Industrial Partners, who willspin off the business under the name "Rocketdyne" in the second half of the year. The deal includes theRL-10 upper stage engine used on theVulcan rocket, but not theRS-25 engine used by theSpace Launch System.[35][9] Later that month, it was announced that the remaining Missile Solutions business was also planned to undergo an IPO as a new company, with L3Harris retaining controlling ownership and the US Government investing $1 billion, in the second half of 2026.[10]
On 13 October 2017, it was reported that Aerojet Rocketdyne completed a keystone demonstration on a new X3ion thruster, which is a central part of the XR-100 system for theNextSTEP program.[43][44] The X3 ion thruster was designed by theUniversity of Michigan[45] and is being developed in partnership with the University of Michigan, NASA, and the Air Force. The X3 is aHall-effect thruster operating at over 100 kW of power. During the demonstration, it broke records for the maximum power output, thrust and operating current achieved by a Hall thruster to date.[43] It operated at a range of power from 5 kW to 102 kW, with electric current of up to 260 amperes. It generated 5.4 newtons of thrust, "which is the highest level of thrust achieved by any plasma thruster to date".[43][46] A novelty in its design is that it incorporates threeplasma channels, each a few centimeters deep, nested around one another in concentric rings.[44] The system is 227 kg (500 lb) and almost 1 metre (3 ft 3 in) in diameter.[43]
Aerojet Rocketdyne is the prime contractor to theUS Department of Energy for theMulti-mission Radioisotope Thermoelectric Generator. The first flight MMRTG is currently powering the MarsCuriosity Rover, and a second flight unit powers thePerseverance Rover.[citation needed]
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