Biggest Defense Companies in the Stock Market

The U.S. defense industry consists of a group of companies battling for contracts from a single customer -- the U.S. government -- with a seemingly insatiable appetite for its products.

The U.S. government spends $850 billion annually on defense, as well as billions more on intelligence and space. A good portion of the total goes to salaries and benefits for soldiers and other purposes, but the U.S. military also spends a hefty chunk on the tanks, ships, and planes built by defense contractors.

Why invest in defense stocks?

Why invest in defense stocks?

The large prime contractors get most of the attention from investors, and rightly so. The so-called primes that mostly deal directly with the government instead of serving as subcontractors to other companies have streamlined to become highly focused specialists competing for multibillion-dollar contract awards.

Defense stocks tend not to be high fliers like tech stocks, but they do offer predictable and stable returns. They tend to move based on what is happening in Washington, D.C., rather than on the cyclical movement of the economy.

They can offer a mix of slow but steady growth and income to a portfolio. Thanks to the extended time frame of government contracting, they can offer predictable revenue well into the future.

What to know before investing

What to know before investing in defense contractors

It's important to understand a few basics about the defense industry. Broadly speaking, any company that receives the bulk of its revenue from government customers, whether it's the Pentagon, civil agencies, or intelligence services, is considered a defense contractor.

There are a few specialists, but after a period of intense consolidation during the 1990s, most of the large contractors have numerous different businesses. Most have at least two areas of emphasis, such as warplanes and missiles or ships and tanks, so they are not overly reliant on any one contract. But none is a jack-of-all-trades able to compete for whatever the Pentagon desires.

The key to investing in the sector is to choose carefully between the contractors based on areas of Pentagon emphasis and relative valuation gaps between the companies that can be explained away or should ease over time.

Biggest defense companies

Biggest defense companies

Here's a look at some of the biggest names in defense:

Companies 1 - 2

1. RTX

RTX doesn't have a massive signature program like a bomber or a warship, but it makes the electronics and high-tech sensors that go into many of those systems. Its missile systems, including the Patriot defense batteries, are among the best in the world, and it provides sensors and other equipment to the intelligence community.

Thanks to its 2020 merger between Raytheon and United Technologies, RTX has a broad portfolio of aerospace businesses, including Pratt & Whitney engines and Collins Aerospace. The mix of defense and commercial revenue means RTX is not overly reliant on either the Pentagon or commercial airlines. However, it also meant that when airlines were hobbled, like during the COVID-19 pandemic, RTX stock fell more than pure-play defense primes.

Raytheon also has more international exposure than its peers, thanks to both its commercial business and the global appetite for missiles. 

2. Lockheed Martin

Lockheed Martin is the largest contractor in terms of defense revenue -- Boeing and RTX both get the majority of sales from nondefense businesses -- and the prime contractor for some of the Pentagon's biggest projects. Its flagship program is the F-35 Joint Strike Fighter, which is expected to generate more than $1 trillion in sales to both the U.S. and its allies over the course of its life cycle.

However, Lockheed Martin is much more than just a one-hit wonder. It is a major producer of missiles and missile defense systems, and it has a dominant helicopter franchise and a rapidly growing space business.

Lockheed Martin is the manager of the famous Skunk Works research facility in California that has produced some of the most iconic military aircraft designs. These days, much of that research and development (R&D) muscle is going toward hypersonics, meaning the missiles and aircraft traveling at more than five times the speed of sound -- a priority for the Pentagon.

Companies 3 - 5

3. Boeing

Boeing is best known for its commercial jet empire, and defense makes up less than one-third of total sales. But that's still enough to place the company among the largest defense contractors.

As one might expect, much of Boeing's defense portfolio is aviation-based. Boeing has an extensive portfolio of planes and helicopters in service, including the F/A-18 Super Hornet, the F-15 fighter, the Apache helicopter, and a number of surveillance and support aircraft. The company also beat out Lockheed Martin to produce the next U.S. fighter jet, to be called the F-47.

Boeing also manufactures several missiles and has a large space business. In addition, it has emerged as a leader in drones and other autonomous systems.

It has been a rough few years for Boeing's commercial business, and there is constant speculation about the company potentially spinning off its defense assets to raise cash. But the mix of defense and commercial should help even out the cyclicality inherent to both businesses, an argument for keeping the company intact.

4. General Dynamics

General Dynamics has an impressive portfolio of defense products. It serves as the U.S. government's primary supplier of tanks and heavy land vehicles, and the company also owns a number of shipyards where destroyers and nuclear-powered submarines are manufactured. But the company has been an underperformer in recent years for reasons that have nothing to do with defense.

General Dynamics also owns Gulfstream, one of the world's largest manufacturers of business jets. That part of its business took nearly a decade to recover from the 2008-09 recession, eating into results and making General Dynamics an underperformer relative to its more defense-focused peers for an extended period of time.

In addition, the company is one of the primary IT vendors to the government, managing networks and doing top-secret work for the Pentagon, spy agencies, and civil bureaucracies.

5. Northrop Grumman

Northrop Grumman is a contractor focused on the skies above. The company's signature programs are its bombers, including the original stealth bomber and the forthcoming B-21. It also makes important subsystems for the F-35 and other aircraft.

The B-21 is predicted to be a $200 billion program over its lifespan, and Northrop Grumman is also the lead contractor on the planned nine-figure overhaul of the nation's aging intercontinental ballistic missile arsenal.

Northrop Grumman was almost sold to Lockheed Martin in the late 1990s, but the deal was eventually blocked by antitrust concerns. The company seemed adrift for a while after that, unsure of how to navigate on its own. In recent years, though, Northrop Grumman has found a clear mission and is evolving into an air and space defense powerhouse.

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Big defense companies are getting bigger

Biggest doesn't always mean best, and simply buying the biggest names in the defense industry is no way to invest. But in an industry that requires massive specialized manufacturing skills, access to security clearances, and strong relationships with government buyers, size does matter.

The world isn't getting any safer, and the government's appetite for products from these companies is unlikely to dry up anytime soon. The order of the rankings might change over time, but there is good reason to expect that today's list of the largest defense companies will look quite similar to one made in a few years' time.

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