Lockheed Martin had total revenue of $67 billion in 2021, which makes it the largest defense stock by revenue, according to Investor's Business Daily. The company creates products that involve aeronautics, missiles and fire control, rotary and mission systems, and outer space. Lockheed Martin generated over $10 billion in sales for each of those types of products in 2020 with a total of $65.4 billion that year, according to its website.