100 biggest U.S. government contractors and what they do

Total dollars obligated: $521,649,869

Total number of contract actions: 37

Headquartered in northwest Montana, S&K Aerospace LLC is a small business that specializes in end-to-end materials management for the U.S. government and its allies. The U.S. Air Force recently chose the company for a $559 million Saudi Arabia F-15 aircraft support contract.

Total dollars obligated: $527,362,962

Total number of contract actions: 235

Recently rebranded as CoreCivic, the Corrections Corporation of America has provided private prison services to the government since 1983. The company works with local, state, and federal agencies.

Total dollars obligated: $527,834,352

Total number of contract actions: 411

The Geo Group, Inc. provides rehabilitation programs to more than 30,000 inmates in custody and upon release for 136 facilities worldwide. Programs include vocational and educational programs, faith-based services, offender rehabilitation, post-release support, and substance abuse treatment.

Total dollars obligated: $529,070,983

Total number of contract actions: 118

What started as a small, family-owned business, Coins 'n Things Inc. is now the largest private company in the precious metal industry. The company, in its third generation of ownership by the same family, provides several services including minting, depository, security, lending, and fine art.

Total dollars obligated: $538,366,095

Total number of contract actions: 39

Funded mostly by the U.S. Department of Energy's Office of Science, Brookhaven Science Associates manages Brookhaven National Laboratory (BNL). BNL employs 3,000 scientists and more than 4,000 visiting researchers to study photon sciences, climate, environment, biosciences, and energy security. 

Total dollars obligated: $559,833,888

Total number of contract actions: 409

Ever wonder who builds those taxpayer-funded landmarks that governments erect in honor of people or events? Construction companies like Hensel Phelps win contracts to plan, build, and manage public landmarks.

Total dollars obligated: $579,260,156

Total number of contract actions: 24,256

Anham Fzco is a contractor that provides services for the government's air, land, and sea projects, including warehousing, supply chain solutions, logistics, project management, fleet and asset management and maintenance.

Total dollars obligated: $596,647,756

Total number of contract actions: 1,130

The Patriot Defense slogan is "Serving those who defend America," and their services match their mission. The company provides intelligence and advanced special operations training, specialized expeditionary support, and staffing support and high-level ops for special missions. Their employees come from organizations like Cyber Command and the CIA.

Total dollars obligated: $603,021,304

Total number of contract actions: 238

Austal is an Australian shipbuilder that has designed 300-plus vessels for more organizations in more than 50 countries. The company, which makes specialized boats like high-speed war catamarans, landed several multi-million-dollar Navy contracts last October alone.

Total dollars obligated: $603,097,360

Total number of contract actions: 278

The first university on the list is Stanford, which competes for numerous government contracts, mostly in the field of research. Among the agencies the higher learning institution battles with for contracts are NASA, the Food and Drug Administration, and the National Institutes of Health.

Total dollars obligated: $604,284,085

Total number of contract actions: 153

When the government goes to work on large technological development projects, it enlists large numbers of of tech companies, many of which are competitors in the same industry. Advanced Technology International organizes and manages these groups, and provides collaboration models to help them work efficiently toward a common goal.

Total dollars obligated: $612,575,284

Total number of contract actions: 5,492,177

The company formerly known as Federal Express needs no introduction, but FedEx does much more than just deliver packages. The global courier and delivery services company is engaged in big business with the U.S. government. In 2017, the Memphis-based company landed a $2.4 billion contract with the Department of Defense.

Total dollars obligated: $625,921,131

Total number of contract actions: 979

A massive organization with 50,000 employees, Serco Group PLC is a British company that operates across the globe. Its many public sector services span six areas: health, citizens services, transport, justice, and immigration.

Total dollars obligated: $642,000,467

Total number of contract actions: 134

Express Scripts Holding Company manages health care services like specialty pharmacy care. and pharmacy and medical benefits management. The company maintains several subsidiaries and affiliates, including Freedom Fertility and Speciality Benefit Services.

Total dollars obligated: $645,768,432

Total number of contract actions: 3,914

Carahsoft Technology Corporation provides IT and cybersecurity services to government entities of all stripes. The company serves as the central aggregator for a huge list of manufacturers, resellers, and system integrators that serve the government, including Adobe, Hootsuite, and Genesys.

Total dollars obligated: $689,307,575

Total number of contract actions: 28,610

Verizon earns state and national government contracts for wireless service, IP services,  communications, cable, and even vehicles. As a result, the company services everything from schools to research facilities to personnel.

Total dollars obligated: $691,523,441

Total number of contract actions: 2,301

Insight Enterprises Inc. provides government agencies with a variety of tech services and products. Among the company's offerings are connected workforce solutions, supply chain optimization, digital innovation, and cloud and data transformation.

Total dollars obligated: $705,230,973

Total number of contract actions: 252

Headquartered in Paris, Sanofi is one of the largest multinational biopharmaceutical companies in the world. Sanofi  provides the government with products like vaccines, and services like research and development (R&D).

Total dollars obligated: $734,066,388

Total number of contract actions: 324,058

Cardinal Health is one of the biggest drug companies in the world—and one of the biggest companies of any industry, for that matter. Cardinal maintains large government laboratories and recently won a $2.25 billion Pentagon contract to supply military branches with surgical and medical supplies.  

Total dollars obligated: $735,539,530

Total number of contract actions: 1,065

British-Dutch energy giant Shell delivers oil, gas, and technology to entities public and private of all sizes, and across all industries around the world. It works with governments not just in providing fuel for facilities, vehicles, and aircraft, but in energy transition, aviation, and exploration.

Total dollars obligated: $754,947,683

Total number of contract actions: 1,740

ManTech deals with technology solutions in areas like systems engineering, enterprise IT and C5ISR. Specifically, the company fills a variety of contracts across numerous federal agencies for products and services like IT management, big data analytics, research and development, telecommunications support, and IT professional services.

Total dollars obligated: $765,735,314

Total number of contract actions: 811

The Parsons Corporation is a leader in developing digital security solutions. The U.S. is just one of 25 countries that hire Parsons to provide IT services like strategic assessment and multi-domain threat assessment.

Total dollars obligated: $776,317,862

Total number of contract actions: 849

The Rolls-Royce Corporation is best known for its namesake luxury automobiles, but the company has a long and storied history as a critical government and military contractor. Rolls produced some of the most famous engines in aviation history, including the one that powered the Supermarine Spitfire plane used during World War II, and the jet engines that propel the Airbus.

Total dollars obligated: $783,060,389

Total number of contract actions: 1,135

Alion is an 80-year-old company that is among the most dominant corporations in the government and aerospace artificial intelligence sector. It has long served as a contractor for the military and other government elements, and its technologies support weapons platforms and training solutions.

Total dollars obligated: $785,912,952

Total number of contract actions: 2,667

Formed in 1971 as part of the Alaska Native Corporations Claims Settlement Act, Nana Regional Corporation is a 100 percent Iñupiat-owned corporation. As a government contractor, it supports mining, drilling, oilfield, and logistics services.

Total dollars obligated: $790,590,302

Total number of contract actions: 4,078

Engility Holdings, Inc. provides both logistics and engineering services to a variety of civilian and military agencies. Its core competencies are high-performance computing, cyber, systems engineering and integration, readiness and training, mission ops support, and enterprise modernization.

Total dollars obligated: $802,692,972

Total number of contract actions: 15,846

AT&T does more than just beam data to your phone so you can watch Netflix at the airport. The telecom giant also provides public sector services through contracts with state, local, and federal agencies to bolster elements like education and public safety—it was AT&T, after all, that spearheaded the creation of the national 9-1-1 network.  

Total dollars obligated: $845,670,522

Total number of contract actions: 5,430

You know Denali Holding Inc. as the parent company of Dell, but it's also an important government contractor. The IT company provides solutions in sectors like health care, transportation and logistics, and software and technology.

Total dollars obligated: $847,527,194

Total number of contract actions: 4,306

Tech products and solutions company CDW is awarded contracts for work with the federal government, state governments, and educational entities. It provides the federal government, for example, with tablets, computers, and networking devices.

Total dollars obligated: $865,397,476

Total number of contract actions: 1,651

MacAndrews & Forbes is a holdings company with an impressive portfolio of companies that cover industries as diverse as cosmetics, biotechnology, and digital entertainment. One of its companies, AM General, recently won a $356 million contract to build 1,673 tactical military vehicles.

Total dollars obligated: $920,308,229

Total number of contract actions: 2,659

With 12,000 global employees, the Arctic Slope Regional Corporation is the largest Alaskan-owned organization in the world. Most of its 10 companies—and the government contracts they earn—deal with Alaska's rich oil, gas, and mineral reserves.   

Total dollars obligated: $920,721,009

Total number of contract actions: 271

British pharmaceutical giant Glaxosmithkline makes popular prescription medications like Flonase and Levitra, but it's also a major government contractor. Much of its work involves the development, testing, and distribution of vaccines.

Total dollars obligated: $920,813,999

Total number of contract actions: 5,743

Enterprise Services LLC is a subsidiary of a larger company, and it holds several important and lucrative government contracts. Organizations like the Department of Homeland Security, the Army, and the Centers for Disease Control and Prevention rely on the company for data, and cloud and digital security solutions.  

Total dollars obligated: $931,738,093

Total number of contract actions: 2,841

Rockwell Collins Inc. is a commercial and business aviation company that also deals in critical infrastructure and railways. In addition, Rockwell has a massive defense and government division that earns contracts for work in fields like avionics, electronic systems, navigation, lighting, targeting, simulation, and training.  

Total dollars obligated: $942,761,742

Total number of contract actions: 2,594

Leonardo is a global leader in high-tech aerospace, defense, and security. It earns contracts to develop and build aircraft, defense systems, land and naval defense electronics, aerostructures, and space systems.  

Total dollars obligated: $948,886,734

Total number of contract actions: 511

As its name implies, the Aerospace Corporation works in the highly technical field of space technology and engineering. The independent, nonprofit corporation is the only federally funded space enterprise research and development center.

Total dollars obligated: $974,067,418

Total number of contract actions: 80

Savannah River Nuclear Solutions is a subsidiary of Honeywell, Fluor and Newport News Nuclear. The government contracts the company for work in areas like nuclear safety, cleanup, waste management, and nonproliferation.

Total dollars obligated: $1,006,470,934

Total number of contract actions: 613

The very first company on the list that boasts 10-figure contact obligations is BP, one of the most prominent energy companies and government contractors in the world. In 2014, the U.S. lifted a ban on government contracts with BP, which had been in place since the 2010 Deepwater Horizon catastrophe in the Gulf of Mexico.

Total dollars obligated: $1,009,851,722

Total number of contract actions: 301

Vectrus provides commercial and military services and products in the fields of IT and network communications, and facility and logistics services. Its contracts support facilities like Keesler Air Force Base and maintenance bases in Turkey and Spain.

Total dollars obligated: $1,011,340,887

Total number of contract actions: 1,496

CH2M Hill Companies Ltd. wins contracts for a variety of critical government work. The company deals in elements like federal facilities operations, infrastructure and transportation, water resources, and ecosystem management. The company counts Metrolinx, the Department of Defense, and the city of Centennial, Colorado among its clients.

Total dollars obligated: $1,030,810,446

Total number of contract actions: 2,480

Johns Hopkins University is one of many universities the government contracts for its laboratories and research programs. In 2018, the university landed a $57 million computer research and development contract with the Air Force, and a $934 million missile defense contract through the school's Applied Physics Lab.

Total dollars obligated: $1,072,763,831

Total number of contract actions: 632

Another university with 10-figure contract obligations is MIT, which has a storied history of partnerships with the government. MIT has operated Lincoln Laboratory since 1951—a Department of Defense Federally Funded Research and Development Center (FFRDC).

Total dollars obligated: $1,074,670,742

Total number of contract actions: 699

PAE has more than six decades of experience in aviation services. Today, the company specializes in unmanned aerial systems, infrastructure management, force sustainment, counter-threat solutions, and information optimization.

Total dollars obligated: $1,093,648,641

Total number of contract actions: 11,035

Hewlett Packard Enterprise Company specializes in digital services and products like high-performance computing, IT infrastructure, artificial intelligence, and cloud data protection. In 2018, the company won a $57 million Department of Defense supercomputing contract.   

Total dollars obligated: $1,122,720,049

Total number of contract actions: 72

Elon Musk's SpaceX corporation designs, builds, and tests rocket technology. In 2012, it launched the first-ever commercial spacecraft contracted to deliver supplies to and from the International Space Station. It boasts among its fleet the Falcon Heavy, the "world's most powerful operational rocket by a factor of two."

Total dollars obligated: $1,132,735,557

Total number of contract actions: 503

One of the largest, most profitable, and best-connected drug companies in the world, Pfizer is also a major recipient of government contracts. The company recently landed a contract with the Department of Health and Human Services.  

Total dollars obligated: $1,156,000,523

Total number of contract actions: 1,701

In the world of computers, few names have a longer and more influential history than IBM, which has been a partner of the U.S. government for generations. Today, IBM boasts major contracts with the U.S. Navy, NASA, the Internal Revenue Service, the Army, and the Department of Defense, among others.

Total dollars obligated: $1,189,030,496

Total number of contract actions: 1,982

With more than 77,000 employees across 400-plus locations, Jacobs Engineering Group Inc. is a major government engineering contractor. The company also wins bids for work in construction, technical services, and design.

Total dollars obligated: $1,201,522,600

Total number of contract actions: 108

With more than $1.2 billion in government contracts, Caddell Construction Co. Inc. has a portfolio of more than $11 billion in projects, both public and private. Its reach spreads into vast and varied industries, like aviation, residential, healthcare, and military.

Total dollars obligated: $1,223,268,002

Total number of contract actions: 875

The Sierra Nevada Corporation specializes in space, aviation, national security, and defense. The company's contracts include space systems, aircraft design, navigation and guidance, electronic warfare, and unmanned systems.

Total dollars obligated: $1,284,885,865

Total number of contract actions: 1,937

If California were a country, it would be the world's fifth-largest economy, ahead of the United Kingdom. With nearly 40 million residents, it's the most populous state in America, and its $2.7 trillion economy represents 14 percent of the American economy. The state holds a long list of government contracts.

Total dollars obligated: $1,452,897,014

Total number of contract actions: 2,168

Deloitte LLP is one of the largest accounting and professional services firms in the world. Its contracts deal with tax and audit services, accounting, risk assessment, and analytics.

Total dollars obligated: $1,462,871,413

Total number of contract actions: 5,619

Textron is a sprawling, $14.2 billion conglomerate with divisions that include defense, aerospace, advanced technologies, security, and aerospace. Its subsidiaries include iconic names like Bell Helicopter and Cessna Aircraft.

Total dollars obligated: $1,481,586,621

Total number of contract actions: 63

UT-Battelle is a Tennessee-based nonprofit company established to operate and manage the Oak Ridge National Laboratory for the U.S. Department of Energy. The research and development organization that works within the company is a 50-50 limited liability partnership between the University of Tennessee and Battelle Memorial Institute.

Total dollars obligated: $1,501,409,356

Total number of contract actions: 1,207

The first company to break the $1.5 billion mark is the MITRE Corporation. It's a nonprofit company that exists solely to manage government facilities. It specializes in cybersecurity, systems engineering, acquisition effectiveness, and advanced technologies.

Total dollars obligated: $1,515,563,622

Total number of contract actions: 2,041

Formerly a subsidiary of Halliburton, KBR Inc. provides construction, procurement, and engineering services. Its divisions include government services, technology, and hydrocarbons services.

Total dollars obligated: $1,525,700,398

Total number of contract actions: 12,121

Oshkosh Corporation is certainly one of the cooler government contractors, provided you're into hulking specialty vehicles that perform the toughest jobs on Earth. Oshkosh makes "severe duty" trucks and transport rigs that serve the military, fire departments, and airports.

Total dollars obligated: $1,637,570,464

Total number of contract actions: 252

Chemonics International Inc. manages government projects in developing nations. The company performs development work in 70 countries through a network of more than 5,000 local specialists.

Total dollars obligated: $1,638,257,510

Total number of contract actions: 27,330

Atlantic Diving Supply Inc. serves organizations like the Department of Defense at the federal level, as well as state and local agencies. It also provides services, including procurement support, logistical support, and operational equipment services to defense contractors, political allies, humanitarian organizations, and protective services organizations.  

Total dollars obligated: $1,664,128,298

Total number of contract actions: 1,097

Alternative investing company Cerberus Capital Management, L.P. manages $35 billion worth of assets. The private equity firm specializes in developing investment platforms, corporate credit, direct lending, non-performing loans, and commercial mortgage-backed securities.

Total dollars obligated: $1,672,024,258

Total number of contract actions: 676

Fluor Corporation is a massive multinational firm that specializes in engineering, procurement, fabrication, and construction. The company's projects include work in mining, life sciences, energy, infrastructure, and chemicals, as well as government work like Army logistics and support at Navy bases.

Total dollars obligated: $1,679,328,841

Total number of contract actions: 115

Specializing in construction, design-build, and general contracting, B.L. Harbert Holdings LLC maintains both a national and international division. It earns $1.25 billion in annual revenues and boasts more than $4.1 billion in green construction projects.

Total dollars obligated: $1,693,430,327

Total number of contract actions: 1,438

Although Accenture Inc. is a management consulting and professional services firm, the company boasts expertise across 40 industries. Its many divisions deal in consulting, strategy, operations, and technology. The company holds more than 6,000 patents or patents pending.

Total dollars obligated: $1,739,891,254

Total number of contract actions: 40

Made up of several cooperating organizations, Lawrence Livermore National Security LLC exists to carry out the National Nuclear Security Administration's mission at the Lawrence Livermore National Laboratory. Among the groups within the company are names like Bechtel National, the University of California, and Battelle Memorial Institute.

Total dollars obligated: $1,767,691,002

Total number of contract actions: 123

One of the largest pharmaceutical companies on the planet, Merck & Co. develops and distributes prescriptions, vaccines, oncology products, and animal health products. The company also maintains a massive research division and deals in business development and licensing. Merck recently won a $117 million contract with the Veterans Administration (VA).

Total dollars obligated: $2,108,806,021

Total number of contract actions: 210,290

Health Net Inc. is a major provider of health insurance, including contracts with the Department of Veterans Affairs, Medicare, and Medicaid. The company recently suffered a major setback when the Department of Defense pulled a multi-billion dollar contract from Health Net and awarded it to rival Aetna.

Total dollars obligated: $2,219,900,504

Total number of contract actions: 326,893

Pharmaceutical wholesaler AmerisourceBergen Corporation works directly with pharmacies, manufacturers, health systems, and physicians. The company recently paid $625 million to resolve a case involving the illegal repackaging of cancer drugs in one of its government contracts.

Total dollars obligated: $2,249,243,854

Total number of contract actions: 109

The rockets built by aerospace titan United Launch Alliance LLC have achieved more than 120 consecutive successful launches since 2006. In March, the company was named among the recipients of a massive series of contracts issued by the U.S. Air Force worth more than half a billion dollars.

Total dollars obligated: $2,336,705,618

Total number of contract actions: 1,691

In the world of government contracts, few names ring louder than Battelle Memorial Institute Inc. The company has divisions that include research and development, laboratory management, and product design and manufacturing. Battelle’s government offerings include maritime systems and technologies, tactical systems and vehicles, security and law enforcement, aerospace systems, and public health.

Total dollars obligated: $2,342,049,683

Total number of contract actions: 39

Consolidated Nuclear Security LLC is comprised of several member companies, including Bechtel National, Inc. The company operates two major facilities in support of the National Nuclear Security Administration—Y-12 National Security Complex and Pantex Plant.

Total dollars obligated: $2,360,958,743

Total number of contract actions: 2,045

Caltech is one of the most lauded doctorate-granting research universities in the world, and the capabilities of its facilities and staff are not lost on top government agencies. In 2018, for example, NASA awarded the school a $30 billion contract to run the agency's vaunted Jet Propulsion Lab.

Total dollars obligated: $2,381,434,221

Total number of contract actions: 9,176

Honeywell is a major player in the aerospace systems and engineering services sector, but the multinational conglomerate also makes a variety of commercial and consumer products. In 2018, the company landed a $1.04 billion defense contract with the Pentagon for support of auxiliary power units for several models of aircraft.

Total dollars obligated: $2,437,108,363

Total number of contract actions: 3,927

CACI International Inc. is a multinational IT and professional services company that provides government services in the realms of intelligence, defense, national security, and government transformation. Its specialties include command and control, business systems, cybersecurity, communications, and surveillance and reconnaissance.

Total dollars obligated: $2,444,105,842

Total number of contract actions: 2,761,836

Health benefits management corporation Triwest Healthcare Alliance Corp. holds more than two million government contract actions. One of its biggest clients is the Department of Veterans Affairs.

Total dollars obligated: $2,457,516,714

Total number of contract actions: 13,793

United Technologies Corporation is a multinational conglomerate that includes nearly $4 billion in research and development investment. Most of its sales are in the fields of military and commercial aerospace, industrial, aftermarket, and original equipment manufacturing.

Total dollars obligated: $2,469,699,844

Total number of contract actions: 65

Los Alamos National Security LLC is a private company formed by several organizations, including the University of California and Bechtel. It is charged with operating the Los Alamos National Laboratory for the U.S. Department of Energy and the National Nuclear Security Administration.

Total dollars obligated: $2,472,643,385

Total number of contract actions: 7,114

Few companies in the history of American business are as established and celebrated as General Electric, which is also a major government contractor. In 2017, GE landed a $643 billion Pentagon contract to make aircraft engines. Less than a year later, GE won a $631 million Pentagon contract to repair and replace engine parts.

Total dollars obligated: $2,509,740,101

Total number of contract actions: 4,830

The Bell Boeing Joint Project Office is an aerospace and defense company that specializes in manufacturing and assembling complete aircraft. In 2018, the company landed a contract to provide 58 V-22 Osprey tiltrotors to the U.S. Navy, Marines, and Air Force, as well as the government of Japan.

Total dollars obligated: $2,526,838,606

Total number of contract actions: 18

National Technology & Engineering Solutions of Sandia LLC operates Sandia National Laboratory. A subsidiary of Honeywell, the company is contracted by the U.S. Department of Energy’s National Nuclear Security Administration.

Total dollars obligated: $2,549,350,438

Total number of contract actions: 1,749

Alliant Techsystems has won several multimillion-dollar contracts in recent years. A subsidiary of Orbital ATK Inc, the research and development company provides products and services related to defense and security.

Total dollars obligated: $2,604,090,977

Total number of contract actions: 2,327,806

Centene is a healthcare group that operates several government-sponsored health care programs. Among its contracts are Medicare, Medicaid, correctional healthcare, military and veterans healthcare, and the health insurance marketplace.

Total dollars obligated: $2,662,844,767

Total number of contract actions: 863

General Atomic is a division of General Dynamics. The company, which now boasts several of its own subsidiaries, deals in high-technology products like electromagnetic systems, nuclear fuel cycles, airborne sensors, and remotely operated surveillance aircraft.

Total dollars obligated: $2,944,849,009

Total number of contract actions: 4,135

CSRA was recently acquired by General Dynamics for $9.7 billion. The company, now a division of GD, provides IT services to the government in areas like national security, healthcare, and civil government.

Total dollars obligated: $3,049,750,791

Total number of contract actions: 451

UnitedHealth Group is one of the world's largest for-profit managed healthcare companies. Aside from its many government-paid contracts, the company provides government employees with healthcare coverage.

Total dollars obligated: $3,194,398,986

Total number of contract actions: 5,833

IT service provider and defense contractor Harris Corporation fulfills several contracts for the government. Among the products and services it provides are aviation computer processors, tactical radios, and electronic warfare systems.

Total dollars obligated: $3,456,304,296

Total number of contract actions: 148,117

Science Applications International Corporation supplies federal civilian agencies and the intelligence community, as well as the Army, Navy, Air Force, and Marines. The company provides mission support in the form of engineering, training, and simulation, while also providing information technology, platforms like ground vehicles and weapons systems, and logistics services.

Total dollars obligated: $3,715,224,841

Total number of contract actions: 344

Health insurance giant Humana Inc. has millions of customers and billions of dollars in revenue, but it's also one of the world's 15 largest government contractors. In 2016, the company landed a Department of Defense contract that more than doubled the number of military members the company serves.

Total dollars obligated: $4,090,256,214

Total number of contract actions: 6,738

IT consulting and management firm Booz Allen Hamilton Holding Corporation deals with federal cyber strategies, among other things. The company's many government contracts focus on IT and telecommunication consulting, broad-based engineering, management, and organizational services.

Total dollars obligated: $4,107,901,916

Total number of contract actions: 4,715

Aecom operates in more than 150 countries. With nearly 90,000 employees, the company finances, designs, builds, and operates infrastructure and related assets.

Total dollars obligated: $4,788,173,031

Total number of contract actions: 19,323

Scientific research company Leidos Holdings Inc. operates in 10 key markets, including intelligence, healthcare, homeland, energy, and space. Its contracts deal with products and services like systems engineering and integration, and data science and engineering.

Total dollars obligated: $5,150,574,646

Total number of contract actions: 8,183

Rounding out the top 10 is L3 Technologies Inc., which is also the first company with more than $5 billion in obligated dollars. The company delivers equipment and devices like surveillance and reconnaissance equipment, training devices, and aerospace instrumentation and navigation equipment.

Total dollars obligated: $5,288,478,018

Total number of contract actions: 10,606

Aerospace, defense, and security firm Bae Systems PLC is a British multinational that holds more than 10,000 contract actions. The company produces, designs, and supports both combat and trainer aircraft, as well as land combat vehicles, future technologies, cybersecurity and intelligence, and electronics.

Total dollars obligated: $5,530,270,696

Total number of contract actions: 155

Procurement, engineering, and construction firm Bechtel is a giant in the world of government contracts. One of the 10 largest privately owned companies in the United States, Bechtel operates in markets including defense, environmental cleanup, water, mining, and infrastructure.

Total dollars obligated: $7,244,968,532

Total number of contract actions: 2,865

Shipbuilder Huntington Ingalls Industries Inc. was formed as a spinoff of defense giant Northrop Grumman. Billed as "America's largest military shipbuilding company," the firm has built more ships in more classes than any other naval shipbuilder.  

Total dollars obligated: $8,796,039,986

Total number of contract actions: 101,260

By its own estimates, "McKesson is the oldest and largest healthcare company in the nation." The company serves half of all American hospitals, and one in five doctors, while delivering one-third of all of North America's daily medications.

Total dollars obligated: $11,194,840,443

Total number of contract actions: 11,333

One of just five companies that boast 11-digit contractually obligated dollars, Northrop Grumman Corporation is a giant in the world of defense contractors. The company deals in areas like autonomous systems and airpower projection, which the company refers to as Strike. You might also know Northrop Grumman as the company that built the B-2 Stealth Bomber.

Total dollars obligated: $14,658,099,967

Total number of contract actions: 13,326

One of the world's biggest defense contractors, Raytheon Company's core concentrations include military electronics and weapons. Its core concentrations include command and control, missile defense, precision weapons, and mission support.

Total dollars obligated: $15,337,197,171

Total number of contract actions: 23,819

Only two contractors get more government work than General Dynamics Corporation. The company does major work in the fields of marine systems, combat systems, aerospace, and information systems and technology.  

Total dollars obligated: $23,362,035,401

Total number of contract actions: 16,215

It's hard to imagine that anyone interested in aviation or the world of government contracts doesn't know the name Boeing. The aircraft manufacturing company just might be the biggest and best at its core concentrations, which include defense, space, and commercial aviation. Its creations include iconic machines like the B-52 Bomber, the AH-64 Apache, and Air Force One.

Total dollars obligated: $50,696,022,243

Total number of contract actions: 151,203

When it comes to government contracts, there's Lockheed Martin and there's everyone else. With more than $50 billion in obligations, it more than doubles the contract values of its next closest competitor. The massive security, defense, aerospace, and advanced technologies company has divisions as varied as energy, missile defense, autonomy and artificial intelligence, weapons systems, and space.