Blue Origin has emerged as the likely buyer for United Launch Alliance

The rocket company owned by Amazon founder Jeff Bezos, Blue Origin, has emerged as the sole finalist to buy United Launch Alliance.

The sale is not official, and nothing has been formally announced. The co-owners of United Launch Alliance (ULA), Lockheed Martin and Boeing, have yet to comment publicly on the sale of the company, which, until the rise of SpaceX, was the sole major launch provider in the United States. They declined again on Wednesday.

"Consistent with our corporate practice, Boeing doesn’t comment on potential market rumors or speculation," a Boeing spokesperson said.