California's aerospace engineering sector is known for its innovation and expertise in designing, manufacturing, and testing aerospace components. Companies in this industry engage in advanced aerospace development, covering aircraft, spacecraft, and defense systems. This sector is influenced by demand for improved aviation technology and the expanding commercial space industry. Notably, California plays a pivotal role in space exploration efforts, hosting influential military contractors and academic research initiatives that are shaping future aerospace advancements. As state and federal agencies increasingly target sustainability, companies are rethinking design and production techniques to meet rigorous environmental standards.

The aerospace companies in this list represent a mix of established and emerging entities based in California, with employee counts ranging from 11 to over 1,000. Founded from the 1940s to 2010s, their specializations touch various sectors, such as unmanned aerial systems and advanced composites. Most of these firms focus on commercial applications, government contracts, and defense innovations while leveraging the latest technologies to enhance their offerings. The geographic spread across California underscores the state's significance in aerospace, driven by a pool of talent from its educational institutions and a robust industrial ecosystem.

Continue reading to learn about California's top aerospace engineering companies.

Top 20 Aerospace Engineering Companies in California

1. Applied Composites

• Website: appliedcomposites.com
• Ownership type: Corporate
• Headquarters: Lake Forest, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Other (Debt), September 2020
• Founded year: 1982
• Headcount: 501-1000
• LinkedIn: appliedcomposites1

Applied Composites, founded in 1982 and based in Lake Forest, California, is a manufacturer that specializes in aerospace components, defense systems, and space structures. The company operates across multiple facilities, totaling approximately 500,000 square feet, equipped with state-of-the-art technology for engineering and manufacturing. They provide advanced composite solutions and MRO services, catering to clients in the aerospace and defense sectors. Their product offerings include complex composite assemblies for fixed and rotary wing aircraft, engine components, and lightweight structures for satellites and launch vehicles. With a workforce of around 392 employees, Applied Composites has built a reputation for quality and reliability, serving notable customers such as Boeing and Lockheed Martin. Their commitment to safety, quality, and customer focus underpins their operations, making them a significant player in the aerospace industry.

2. Precision Engine Controls

• Website: precisioneng.com
• Ownership type: Corporate
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: $44.2M, January 2015
• Founded year: 1968
• Headcount: 51-200
• LinkedIn: precision-engine-controls

Precision Engine Controls, a subsidiary of Meggitt, is based in San Diego, California, and has been a significant player in the aerospace and defense industries since its founding in 1968. The company specializes in manufacturing a wide array of products, including advanced composites, avionics, and thermal management systems. Their offerings cater to both civil and military aviation sectors, providing essential components that enhance safety and performance. Precision Engine Controls is known for its commitment to innovation, ensuring that its products meet the rigorous demands of the aerospace industry. The company has a workforce of approximately 51-200 employees and has received funding amounting to $44.2 million as of January 2015, indicating a level of financial backing that supports its ongoing operations and development.

3. NextGen Aeronautics

• Website: nextgenaero.com
• Ownership type: Private
• Headquarters: Torrance, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2002
• Headcount: 11-50
• LinkedIn: nextgen-aeronautics

NextGen Aeronautics, founded in 2002 and based in Torrance, California, is a private aerospace engineering firm with a workforce of approximately 20 employees. The company specializes in the design, fabrication, and testing of unmanned aerial vehicles (UAVs) and aircraft, serving both military and commercial sectors. With a portfolio that includes over 200 completed projects, NextGen has collaborated with prominent clients such as DARPA, the U.S. Air Force, Navy, and Army, as well as major systems integrators. Their expertise spans various technical areas, including advanced sensor systems, wind tunnel models, and innovative aircraft designs. The firm is dedicated to providing quality engineering services and has established a reputation for delivering unique prototypes and limited-rate production of complete vehicles. Their operations are supported by a robust research and development framework, ensuring they remain at the forefront of aerospace technology advancements.

4. Scaled Composites, LLC

• Website: scaled.com
• Ownership type: Corporate
• Headquarters: Mojave, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: July 2007
• Founded year: 1982
• Headcount: 201-500
• LinkedIn: scaled-composites

Scaled Composites, LLC, based in Mojave, California, is an aerospace company that specializes in the design, development, and testing of experimental aircraft and vehicles. Founded in 1982 by Burt Rutan, Herb Iversen, and Pat Storch, the company has established itself as a pioneer in innovative engineering solutions and rapid prototyping services. Scaled Composites engages in all phases of aerospace project development, from conceptual design to systems integration and extensive testing. Their portfolio includes notable projects such as the SpaceShipOne, which marked a significant milestone in private spaceflight. The company operates with a team of skilled engineers and technicians who are dedicated to pushing the limits of aerospace technology. With a workforce of around 231 employees, Scaled Composites continues to pursue groundbreaking projects that contribute to the evolution of aviation and aerospace engineering.

5. Sierra Technical Services

• Website: sierratechnicalservices.com
• Ownership type: Corporate
• Headquarters: Tehachapi, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: October 2023
• Founded year: 2006
• Headcount: 51-200
• LinkedIn: sierra-technical-services-inc

Sierra Technical Services, Inc. (STS) is an aerospace engineering and manufacturing firm based in Tehachapi, California. Established in 2006, the company specializes in the design and production of composite aircraft and components, catering to both government and commercial sectors. STS offers a range of services, including digital engineering, systems integration, and manufacturing of unmanned systems. Their engineering team comprises experienced professionals skilled in various disciplines, such as aerodynamics, propulsion design, and aircraft structures analysis. STS operates from a 20,000-square-foot facility at the Tehachapi Municipal Airport, which is equipped to support rapid prototyping and specialized test fixtures. The company has been involved in significant projects, including the development of the Fifth Generation Aerial Target (5GAT) for the U.S. Air Force. STS's commitment to quality is underscored by its AS9100D and ISO 9001:2015 certifications, ensuring that their products meet stringent industry standards.

6. ATA Engineering

• Website: ata-e.com
• Ownership type: Private
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2000
• Headcount: 51-200
• LinkedIn: ata-engineering

ATA Engineering, Inc., based in San Diego, California, is a private engineering services firm established in 2000. The company specializes in providing design, analysis, and testing solutions primarily for the aerospace and defense industries. With a workforce of approximately 232 employees, ATA Engineering has developed a strong portfolio that includes advanced engineering services and custom software development. Their capabilities cover a wide range of areas, including modal testing, structural dynamics, and various forms of analysis such as thermal and aerothermal assessments. ATA Engineering has also been recognized for its contributions to the industry, receiving prestigious awards like NASA's George M. Low Award, which acknowledges contractors for technical and business excellence. The company operates across multiple locations in the United States, ensuring a broad reach within the aerospace sector.

7. Integral Aerospace

• Website: integralaerospace.com
• Ownership type: Corporate
• Headquarters: Santa Ana, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: August 2021
• Founded year: 2017
• Headcount: 51-200
• LinkedIn: integralaerospace

Integral Aerospace, acquired by PCX Aerosystems in 2021, operates out of Santa Ana, California. The company is recognized for its expertise in precision machining and the production of critical components for military and space applications. Integral Aerospace specializes in manufacturing landing gear, external fuel tank systems, and composite components, which are vital for various aerospace platforms. Their operations are characterized by advanced manufacturing techniques and a strong emphasis on quality assurance, ensuring that their products meet the rigorous demands of the aerospace and defense sectors. Integral Aerospace's integration into PCX Aerosystems has expanded its capabilities, allowing it to contribute significantly to the supply chain for aerospace manufacturers.

8. VACCO Industries

• Website: vacco.com
• Ownership type: Private
• Headquarters: South El Monte, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1954
• Headcount: 201-500
• LinkedIn: vacco-industries

VACCO Industries, founded in 1954 and based in South El Monte, California, is a private manufacturer specializing in fluid control systems tailored for the aerospace and defense sectors. With a workforce of approximately 340 employees, the company has built a reputation for delivering high-quality solutions for critical applications, including propulsion valves and micro propulsion systems. VACCO serves a range of clients, including government agencies and prominent aerospace companies. Their products are integral to various missions, such as NASA's Artemis program, where they have been recognized for their exceptional support. The company is also a proud member of the Coalition for Deep Space Exploration, highlighting its commitment to advancing space exploration. VACCO's engineering and manufacturing capabilities are complemented by a strong focus on quality assurance and program management, ensuring that they meet the stringent demands of the aerospace industry.

9. Exquadrum

• Website: exquadrum.com
• Ownership type: Private
• Headquarters: Victorville, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2002
• Headcount: 51-200
• LinkedIn: exquadrum-inc

Exquadrum, Inc. is an engineering consulting and manufacturing company based in Victorville, California, established in 2002. The firm specializes in defense and aerospace technologies, providing a range of services that include engineering design, precision manufacturing, and technical support. Exquadrum has a strong emphasis on innovation and rapid technology development, which allows them to meet the complex needs of their clients effectively. The company has worked on over 70 contracts, focusing on areas such as rocket propulsion, controllable solid rockets, and hypersonic missile technology. Notably, they demonstrated a hybrid booster for Virgin Galactic and completed a significant contract for DARPA, showcasing their capabilities in advanced aerospace projects. Exquadrum's commitment to quality and customer satisfaction is evident in their operational approach, which integrates research, development, and technical services all within their facilities.

10. Stratolaunch

• Website: stratolaunch.com
• Ownership type: Private
• Headquarters: Mojave, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Other (Grant), $24.7M, January 2025
• Founded year: 2011
• Headcount: 201-500
• LinkedIn: stratolaunch

Stratolaunch LLC is a private aerospace company based in Mojave, California, founded in 2011. The company specializes in hypersonic flight testing and air-launch systems, providing essential services to government and defense customers. Stratolaunch designs, manufactures, and launches aerospace vehicles, focusing on high-speed flight test services that are crucial for validating hypersonic technologies. Their flagship products include the Talon-A, a reusable hypersonic testbed, and the Roc, the world's largest operating aircraft, which serves as a mobile launch platform. Stratolaunch's operations are centered around enabling routine access to the hypersonic environment, allowing for rapid technology development and high-quality data collection. The company has received significant funding, including a recent grant of $24.7 million in January 2025, which supports their ongoing projects and initiatives in hypersonic testing.

11. Karem Aircraft

• Website: karemaircraft.com
• Ownership type: Private
• Headquarters: Lake Forest, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2004
• Headcount: 51-200
• LinkedIn: karem-aircraft

Karem Aircraft, founded in 2004 by Abe Karem, is an aerospace manufacturer based in Lake Forest, California. The company specializes in the development and production of advanced aircraft, including both fixed-wing and rotary-wing systems. Karem Aircraft is particularly known for its innovative Optimum Speed Tiltrotor (OSTR) technology, which combines the speed and cost-effectiveness of fixed-wing aircraft with the hover capabilities of helicopters. The company serves military organizations and is actively involved in various defense-related programs, contributing to advancements in vertical lift capabilities. Karem's recent projects include participation in the U.S. Army's Joint Multi-Role Technology Demonstration and contributions to DARPA's VTOL X-Plane program. Additionally, Karem is exploring commercial applications for its technology, with initiatives like the AeroTrain and AeroCommuter tiltrotors aimed at passenger transportation. With a dedicated team of engineers and technicians, Karem Aircraft continues to push the boundaries of aerospace innovation.

12. ES3 - Engineering and Software System Solutions, Inc.

• Website: es3inc.com
• Ownership type: Private
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2000
• Headcount: 201-500
• LinkedIn: es3-inc

ES3 - Engineering and Software System Solutions, Inc., founded in 2000 and based in San Diego, California, is an engineering firm that specializes in aerospace technologies. The company offers a range of services including maintenance, repair, and overhaul for military and commercial aircraft. With a workforce of approximately 120 employees, ES3 operates multiple facilities across the United States and even has a presence in Austria. Their engineering capabilities extend to system design and redesign, testing, diagnostics, and analysis, as well as environmental initiatives aimed at reducing the ecological impact of aerospace production. ES3's expertise includes specialized services for aircraft structures, landing gear systems, and F-16 aircraft, showcasing their technical proficiency in critical areas of aerospace engineering. The firm is dedicated to improving the performance and safety of mission-critical components while also focusing on sustainable practices in aviation maintenance.

13. ASTECH Engineered Products, Inc.

• Website: astechengineeredproducts.com
• Ownership type: Corporate
• Headquarters: Santa Ana, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: May 2002
• Founded year: 1947
• Headcount: 51-200
• LinkedIn: astechep

ASTECH Engineered Products, Inc., based in Santa Ana, California, has been a prominent player in the aerospace manufacturing sector since its establishment in 1947. The company specializes in producing all-welded honeycomb aerostructures, which are lightweight and high-strength materials essential for various aerospace applications, including commercial and military aircraft, missiles, and space vehicles. ASTECH's innovative approach to manufacturing involves a unique production process that enhances the structural integrity and performance of their products. They utilize advanced materials such as titanium, stainless steel, and nickel alloys, ensuring that their offerings meet the rigorous demands of the aerospace and defense industries. The company is dedicated to quality, as evidenced by their certifications and continuous monitoring of manufacturing processes. ASTECH's engineering capabilities are robust, supporting design for manufacturing and employing advanced simulation tools to validate product performance. Their focus on customer needs and industry standards makes them a reliable partner in aerospace projects.

14. Arrowhead Products

• Website: arrowheadproducts.net
• Ownership type: Private
• Headquarters: Los Alamitos, California, United States (USA)
• Employee distribution: United States (USA) 99%, Other 1%
• Founded year: 1937
• Headcount: 501-1000
• LinkedIn: arrowhead-products

Arrowhead Products, established in 1937, is an aerospace manufacturer based in Los Alamitos, California. The company specializes in high and low pressure ducting systems and components, providing essential engineering, testing, and manufacturing services primarily to the aerospace sector. Their extensive experience has positioned them as a significant contributor to both commercial and military aviation, as well as space exploration initiatives. Arrowhead's products are utilized in various applications, including environmental control systems and propulsion lines for rockets. The company has a notable history of involvement in major aerospace projects, including supplying propellant feedlines for NASA's Apollo program and components for modern military aircraft like the F-35. Arrowhead Products operates with a commitment to quality, adhering to stringent industry standards and certifications, which further solidifies their reputation in the aerospace engineering domain.

15. Swift Engineering

• Website: swiftengineering.com
• Ownership type: Private
• Headquarters: San Clemente, California, United States (USA)
• Employee distribution: United States (USA) 95%, United Kingdom (UK) 5%
• Founded year: 1983
• Headcount: 51-200
• LinkedIn: swift-engineering-inc.

Swift Engineering, based in San Clemente, California, is an engineering firm that specializes in aerospace and automotive solutions. Established in 1983, the company has over 40 years of experience in product development, research and development, and manufacturing services. Swift Engineering is known for its innovative approach, taking products from concept to production. The company has a strong focus on advanced technologies, particularly in the development of unmanned aerial systems (UAS) and other aerospace components. Notable projects include the design and manufacturing of airframes for the Future Attack Reconnaissance Aircraft (FARA) and the Future Long-Range Assault Aircraft (FLRAA). Their commitment to quality and efficiency has earned them partnerships with some of the largest aerospace companies in the world, showcasing their relevance and expertise in the industry.

16. Affordable Engineering Services

• Website: affordservices.com
• Ownership type: Private
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 97%, Other 3%
• Founded year: 1996
• Headcount: 501-1000
• LinkedIn: affordable-engineering-services-inc

Affordable Engineering Services, Inc. (AES), founded in 1996 and based in San Diego, California, is a private aerospace engineering firm that specializes in military aircraft maintenance and support. The company provides a range of services, including maintenance, repair, and overhaul (MRO), engineering, and program management, primarily for the U.S. Department of Defense and allied military partners. AES has built a reputation for ensuring mission readiness through technical excellence and innovative solutions. With a workforce of approximately 500 employees, the company has established itself as a reliable contractor in the defense sector, working on various military aircraft such as the F/A-18, F-22, and F-35. AES also has expertise in unmanned systems, offering engineering and maintenance services for unmanned aerial vehicles. Their commitment to quality and efficiency has led to multiple multimillion-dollar contracts, demonstrating their capability and relevance in the aerospace engineering industry.

17. Deployable Space Systems Inc.

• Website: dss-space.com
• Ownership type: Private
• Headquarters: Santa Barbara, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2008
• Headcount: 11-50
• LinkedIn: deployable-space-systems-inc

Deployable Space Systems Inc., based in Santa Barbara, California, is a private aerospace company founded in 2008. The firm specializes in space infrastructure and engineering services, providing innovative technologies that support various space missions. Their product offerings include solar arrays, satellite payloads, and solutions for in-space manufacturing. The company serves a range of clients, including government agencies and commercial space organizations, which rely on their expertise to advance space exploration initiatives. With a team of 33 employees, Deployable Space Systems is positioned to contribute significantly to the evolving landscape of aerospace engineering, particularly in the areas of power generation and deployable structures for space applications.

18. Martinez & Turek, Inc.

• Website: martinezandturek.com
• Ownership type: Private
• Headquarters: Rialto, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1980
• Headcount: 51-200
• LinkedIn: martinez-%26-turek-inc.

Martinez & Turek, Inc. is an engineering and manufacturing company based in Rialto, California, established in 1980. With a workforce of approximately 77 employees, the company specializes in providing high-quality solutions for complex projects across various sectors, including aerospace, defense, and medical. Their services range from manufacturing and welding to engineering design, catering to clients that require innovative and efficient solutions. Notably, Martinez & Turek has played a significant role in the aerospace industry, contributing to projects for NASA and Northrop Grumman, including the design and build of components for the Orion spacecraft and the Space Launch System. Their commitment to quality is reflected in their certifications, including ISO 9001:2015 and AS9100 Rev D, which ensure adherence to rigorous industry standards. The company prides itself on its ability to handle all stages of a project on-site, providing personalized service and maintaining strong communication with clients throughout the process.

19. Notthoff Engineering - L.A. - Inc.

• Website: notthoff.com
• Ownership type: Private
• Headquarters: Huntington Beach, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1941
• Headcount: 11-50
• LinkedIn: notthoff-engineering---l.a.---inc.

Notthoff Engineering - L.A. - Inc. is a private engineering and manufacturing firm based in Huntington Beach, California, with a history dating back to 1941. The company specializes in the aerospace and defense sectors, providing a range of services that include innovative engineering solutions, premium machining, and assembly services. Their facility spans 65,000 square feet and is equipped with advanced machining capabilities, including complex 3, 4, and 5-axis machining for aluminum and hard metal components. Notthoff Engineering is dedicated to maintaining high-quality standards, as evidenced by their AS9100 Rev D and ISO 9001:2015 certifications. They serve a clientele primarily composed of businesses in the aerospace industry, focusing on complex components and assemblies. Their commitment to investing in technology and workforce education further enhances their position in the aerospace market.

20. Senior Aerospace Ketema

• Website: saketema.com
• Ownership type: Corporate
• Headquarters: El Cajon, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: January 1997
• Founded year: 1953
• Headcount: 201-500
• LinkedIn: senior-aerospace-ketema

Senior Aerospace Ketema, based in El Cajon, California, is an aerospace manufacturer with a rich history dating back to 1953. The company specializes in precision-engineered components for aircraft and turbine engines, catering to sectors such as civil aviation, defense aviation, energy, and marine industries. Their manufacturing capabilities include complex fabrications and advanced machining processes, particularly with materials like titanium and nickel alloys. Ketema operates from a substantial facility that spans over 378,000 square feet, allowing them to manage a variety of manufacturing processes in-house. They are recognized for their ability to support original equipment manufacturers (OEMs) throughout the product lifecycle, from development to full-rate production. Their certifications, including ISO 9001 and NADCAP, reflect their commitment to maintaining high standards in quality and safety. This positions them as a reliable partner for aerospace systems and components.

Aerospace Engineering Insights: Key Companies in California

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