Federal contracting has a small circle of winners, and the numbers behind them are staggering. See exactly who dominates GSA, defense, and construction contracting in 2026, and what their playbook means for a growing business chasing its own federal contract.
Key Takeaways
- The GSA Multiple Award Schedule closed FY2025 with $50.6 billion in total sales across approximately 14,579 active contractors (GSA SSQ+).
- Lockheed Martin, RTX, Northrop Grumman, Boeing, and General Dynamics make up the Big 5 defense contractors, together holding well over $140 billion in annual defense revenue.
- Turner Construction leads the ENR 2026 Top 400 list of general contractors with $28.3 billion in 2025 revenue.
- China State Construction Engineering Corp. tops the ENR 2025 Top 250 Global Contractors list, while Grupo ACS/Hochtief leads international (overseas) revenue.
- Small and mid-sized businesses do not need Lockheed Martin’s scale to win federal work. A GSA Schedule contract puts you in front of the same buyers.
Table of Contents
Why Federal Contractor Rankings Matter
The federal government spent $793 billion on contracts in FY2025, making it the largest single buyer of goods and services in the world (GAO, June 2026). A handful of companies capture a disproportionate share of that spending, and understanding who they are tells you where the real opportunity sits.
The GSA Multiple Award Schedule is the largest commercial acquisition program inside that federal marketplace, closing FY2025 with $50.6 billion in total sales across approximately 14,579 active contractors (GSA SSQ+). Small businesses hold roughly 80% of those active MAS contracts and captured 36% of MAS award dollars.
Knowing the biggest players in defense, general construction, and global contracting gives you the full picture. As a result, you can see exactly where a smaller company fits into a market this large.
The Big 5 Defense Contractors
Five companies dominate US defense spending and set the pace for the entire industry. Ranked by 2025 defense revenue, they are:
| Rank | Company | Defense Revenue | Signature Programs |
| 1 | Lockheed Martin | $60.3B | F-35 fighter, THAAD, Aegis, space systems |
| 2 | RTX Corporation | $39.6B | Patriot, Tomahawk, Pratt & Whitney engines |
| 3 | Northrop Grumman | $36.8B | B-21 stealth bomber, Sentinel ICBM, space systems |
| 4 | Boeing Defense | $34.2B | F/A-18, KC-46 tanker, Apache helicopter |
| 5 | General Dynamics | $32.0B | Abrams tank, Virginia-class submarines, GDIT |
Source: fed-spend.com, Largest US Defense Contractors by Revenue, 2025-2026.
Together, the Big 5 hold roughly $200 billion in combined defense revenue. However, revenue is only part of the story. Boeing’s defense unit represents just 44% of its total business, while Northrop Grumman is 94% defense, showing how differently each company is built.
The Top 10 Defense Contractors in the United States
Expand the list past the Big 5 and a second tier of specialists emerges, covering electronics, IT services, and shipbuilding. Here are the top 10 US defense contractors by 2025 defense revenue:
| Rank | Company | Defense Revenue | Defense Share of Total Revenue |
| 1 | Lockheed Martin | $60.3B | 89% |
| 2 | RTX Corporation | $39.6B | 57% |
| 3 | Northrop Grumman | $36.8B | 94% |
| 4 | Boeing Defense | $34.2B | 44% |
| 5 | General Dynamics | $32.0B | 76% |
| 6 | L3Harris Technologies | $19.4B | 92% |
| 7 | BAE Systems (US ops) | $15.8B | 55% |
| 8 | Leidos | $14.8B | 91% |
| 9 | HII (Huntington Ingalls) | $11.7B | 99% |
| 10 | Booz Allen Hamilton | $9.4B | 88% |
Source: fed-spend.com, Largest US Defense Contractors by Revenue, 2025-2026.
Notice how many of these firms also carry GSA Schedule contracts alongside their defense-specific vehicles. A GSA Schedule is rarely a company’s only path to federal revenue. Instead, it works alongside other contract vehicles to widen the doors a business can walk through.
The Top 10 Biggest General Contractors in the US
Outside the defense world, the construction industry has its own giants. Engineering News-Record ranks them every year in its Top 400 Contractors list, based on 2025 revenue:
| Rank | Company | Headquarters | 2025 Revenue |
| 1 | Turner Construction Co. | New York, NY | $28.3B |
| 2 | Bechtel | Reston, VA | $19.5B |
| 3 | STO Building Group | New York, NY | $15.6B |
| 4 | Kiewit Corp. | Omaha, NE | $15.3B |
| 5 | The Whiting-Turner Contracting Co. | Baltimore, MD | $14.7B |
| 6 | MasTec Inc. | Coral Gables, FL | $14.3B |
| 7 | DPR Construction | Santa Clara, CA | $14.0B |
| 8 | HITT Contracting | Falls Church, VA | $13.0B |
| 9 | Fluor | Irving, TX | $10.9B |
| 10 | Mortenson | Minneapolis, MN | $10.8B |
Source: Engineering News-Record, 2026 Top 400 Contractors (2025 revenue).
Total revenue across ENR’s Top 400 contractors rose 11.8% to $671.4 billion in 2025, driven largely by a surge in data center construction. Several of these firms, including Bechtel and Fluor, also hold federal and GSA-adjacent contracts for government facilities and infrastructure work.
The Largest Global Contractors
Zoom out to the world stage and the rankings shift toward state-backed construction giants, mainly out of China and Europe. ENR tracks two related lists: total global contractor revenue and international (overseas-only) revenue.
Top 5 by Total Global Contractor Revenue
| Rank | Company | Headquarters |
| 1 | China State Construction Engineering Corp. | Beijing, China |
| 2 | China Railway Group Ltd. | Beijing, China |
| 3 | China Railway Construction Corp. Ltd. | Beijing, China |
| 4 | China Communications Construction Group Ltd. | Beijing, China |
| 5 | VINCI | Nanterre, France |
Source: ENR 2025 Top 250 Global Contractors.
Top 5 by International (Overseas) Revenue
| Rank | Company | Headquarters |
| 1 | Grupo ACS/Hochtief | Madrid, Spain |
| 2 | VINCI | Nanterre, France |
| 3 | Bouygues | Paris, France |
| 4 | China Communications Construction Group Ltd. | Beijing, China |
| 5 | STRABAG SE | Vienna, Austria |
Source: ENR 2025 Top 250 International Contractors.
Combined international revenue among the Top 250 reached approximately $501.2 billion in 2024, up just 0.5% year over year. China alone accounted for 76 of the 250 firms on the list, while Turkish contractors held the number two spot by country with 45 firms.
What This Means for Small and Mid-Sized Businesses
Most small business owners see a list like this and assume federal contracting is closed to them. That reaction is understandable, but it misses how the system actually works.
Giants like Lockheed Martin and Turner Construction win prime contracts, then subcontract enormous portions of the work to smaller, specialized firms. In addition, agencies are required to steer a set share of spending directly to small businesses. The federal government awarded $179 billion in prime contracts to small businesses in FY2025, representing 28% of all prime contracting dollars and exceeding the statutory 23% goal (SBA, June 2026).
A GSA Schedule contract is one of the most direct paths into that spending. It does not require the scale of a Fortune 500 prime. Instead, it requires the right pricing structure, the right documentation, and ongoing compliance once you are awarded.
How GSA Contract Services Helps
GSA Contract Services, LLC has guided manufacturers, distributors, and service providers through the GSA Multiple Award Schedule process since 1995. As an Authorized Negotiator, our team prepares offers, manages audits, and supports contract modifications for more than 250 active clients.
- Offer preparation: building a GSA Schedule proposal that meets contracting officer expectations the first time.
- Post-award contract management: staying compliant on Transactional Data Reporting (TDR), now mandatory for every MAS SIN as of Refresh 31 in April 2026.
- Contract modifications and renewals: adding products, adjusting pricing, and preparing for the 210-day renewal review window.
- Audit support: representing your company through GSA compliance reviews so a routine audit stays routine.
As a result, you get the guidance a 30-year firm can offer, without building an in-house compliance team from scratch.
Quick Recap
- The Big 5 defense contractors are Lockheed Martin, RTX, Northrop Grumman, Boeing, and General Dynamics.
- Turner Construction leads US general contractors with $28.3 billion in 2025 revenue.
- China State Construction Engineering Corp. leads global contractors overall, while Grupo ACS/Hochtief leads international revenue.
- The GSA Multiple Award Schedule closed FY2025 at $50.6 billion in sales across roughly 14,579 contractors.
- Small businesses hold about 80% of active GSA Schedule contracts, proving the door is open well beyond the giants on these lists.
Frequently Asked Questions
What are the big 5 defense contractors?
The Big 5 US defense contractors are Lockheed Martin, RTX Corporation, Northrop Grumman, Boeing Defense, and General Dynamics. Together, they control the majority of US defense manufacturing revenue, covering aircraft, missiles, naval systems, and space programs.
Who are the top 10 biggest general contractors in the US?
Based on 2025 revenue, the top 10 are Turner Construction, Bechtel, STO Building Group, Kiewit, The Whiting-Turner Contracting Co., MasTec, DPR Construction, HITT Contracting, Fluor, and Mortenson (Engineering News-Record, 2026 Top 400 Contractors).
Who are the largest global contractors?
China State Construction Engineering Corp. ranks first on ENR’s 2025 Top 250 Global Contractors list by total revenue, followed by China Railway Group, China Railway Construction Corp., China Communications Construction Group, and VINCI. Ranked instead by overseas-only revenue, Grupo ACS/Hochtief takes the top spot.
Who are the top 10 defense contractors in the United States?
By 2025 defense revenue, the top 10 are Lockheed Martin, RTX Corporation, Northrop Grumman, Boeing Defense, General Dynamics, L3Harris Technologies, BAE Systems (US operations), Leidos, HII, and Booz Allen Hamilton.
Get Started
These rankings show what winning at scale looks like. However, your first GSA Schedule contract does not need to compete with Lockheed Martin’s. It needs to fit your business, and that is exactly where GSA Contract Services comes in.
Our Authorized Negotiators have helped over 250 companies since 1995 turn federal contracting into a real revenue channel. Reach out today to find out where you stand.
GSA Contract Services, LLC | 4622 Cedar Avenue, Suite 123, Wilmington, NC 28403 | 202-280-7060 | Sales@GSA-CS.com
