Four companies dominate the U.S. military UAV market, according to a study by market research firm Govini.

General Atomics, Northrop Grumman, Textron and Boeing account for 66 percent of the $9 billion market, the study found. The General Atomics MQ-9 Reaper alone accounted for more than a quarter of the market.

"General Atomics is the top vendor that owns more than a third of the Defense market at more than $4 billion," Govini said. "Northrop Grumman is a distant second with less than half of that capture. Combined, these top two vendors account for more than 50 percent of the UAS market. Textron owns 10 percent of the market, while Boeing rounds out the top four with seven percent."

"Since the Air Force has more sophisticated mission requirements, it has the least competition, averaging 10 offers per award and an average deal size of $1.9 million," according to the study. "The Army is more competitive with an average of 15 offers and, when defined by average deal size, is also the most lucrative customer with an average deal size of $2.1 million. The Navy is the most competitive with an average of 31 offers received on an average deal size of $781,000."

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