The Satellite in a Backpack: Inside Urban Sky's Stratospheric Bet
Key points
Key takeaways from a Massive Signals interview with Urban Sky CEO Andrew Antonio (2026):
The stratosphere sits between aviation and space. It has drawn almost no investment. Antonio expects it to become as important as space. Balloons are the way up. The sector has been dormant for decades.
Urban Sky works on three problems. Reusable balloons. Small payloads. Wind layer navigation. It says it flew a reusable balloon up multiple times.
The firm began with StratEx. That project built a space suit for Alan Eustace. His jump set a record. Jared Leidich is co-founder and CTO.
Urban Sky first sold balloon imagery. Insurance firms and oil firms bought it. A better product could not beat satellite contracts. It then sold systems to defence buyers. The US Army was an early buyer.
One-button systems cost less to launch than to shoot down. The Pentagon liked that asymmetry. The 2023 Chinese spy balloon event helped sales.
Headcount stayed near twelve people until product market fit. Then came a $30 million Series B. Altos Ventures led it. It closed in about two months.
Urban Sky wants to be the SpaceX of the stratosphere. It plans a family of balloon systems. Then fleets of thousands of balloons. Some stay up six months to over a year.
Read more: YouTube · Massive VC
