United Launch Alliance Enables Expansion of Amazon Leo Constellation through Fourth Successful Launch

Atlas V has precisely delivered more than 100 operational satellites for
Amazon Leo internet network 

• ULA Atlas V launched another 27 operational broadband satellites for the Amazon Leo constellation, bringing the total number of satellites launched by ULA to 108.
• With a total of 47 launches between ULA’s Atlas and Vulcan vehicles, ULA is launching the majority of Amazon’s initial satellite constellation of more than 3,000 satellites.
• ULA’s Atlas V and Vulcan rockets are catalysts to connecting the world, one launch at a time.

Cape Canaveral Space Force Station, Fla., (Dec. 16, 2025) – A United Launch Alliance (ULA) Atlas V rocket carrying the Leo 4 mission for Amazon lifted off on Dec. 16 at 3:28 a.m. EST from Space Launch Complex-41 at Cape Canaveral Space Force Station. This mission demonstrates the strong partnership between ULA and Amazon to accurately and rapidly launch and deliver innovation solutions for global connectivity.   

“One of our primary missions at ULA is to be a catalyst in connecting the world,” said Gary Wentz, ULA vice president of Atlas and Vulcan programs. “Partnering with Amazon contributes to their mission of bridging the global digital gap. We thank the Amazon Leo team for their continued collaboration.”

The Amazon Leo 4 launch deployed another batch of operational satellites into low Earth orbit. There are multiple remaining Amazon Leo missions on the Atlas V rocket, as well as 38 high-cadence, rapid fire launches on the next-generation Vulcan rocket. Through the world’s largest commercial launch agreement, ULA will deliver more than half of Amazon’s initial constellation 3,000 plus satellites.

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For two decades, ULA has served as the custodian of America’s national security space mission. Our rockets fly to the most challenging and exotic orbits the nation requires, while delivering the most accurate payload insertions in the world. ULA continues to carry this unique capability forward with the new Vulcan rocket, the latest and most advanced vehicle of this type. Utilizing an innovative, modular architectural approach, Vulcan has expanded into the commercial LEO marketplace, providing efficient access to all orbits into the foreseeable future. With even more innovative technology on our horizon, the sky is definitely not the limit.

For more information on ULA, visit the ULA website at www.ulalaunch.com and join the conversation on social media @ulalaunch.  

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