YCF25ยท OtherZephyr Fusion
Powering tomorrow's industrial revolution in space
Founders
Not read from YC yet; the weekly run fills these in.
Same space
Competitors
Closest in what they build, same category.
Adjacent
Overlapping tags, a different niche.
QuindarS22Datadog for SpaceShared: satellites, aerospaceActive
RadicalW23Building persistent, high-performance infrastructure in the skyShared: satellites, aerospaceActive
AlbedoW21Full-stack VLEO satellite missionsShared: satellites, aerospaceActive
WardstoneF25The Modular Interceptor PlatformShared: satellites, aerospaceActive
BasaltW24Constellations as a ServiceShared: satellites, aerospaceActive
Also from F25
Batchmates in Fall 2025.
About Zephyr Fusion
Zephyr Fusion is building the first in-orbit fusion power source: a megawatt-class reactor enabling large-scale industry in space, at a fraction of the cost of equivalent solar. Founded by former physicists from Lawrence Livermore and Oak Ridge National Laboratories, Zephyr leverages decades of fusion research to deliver a compact magnetic confinement system designed to take advantage of the space environment.
San Diego, CA, USA
Zephyr Fusion: questions
Which YC batch was Zephyr Fusion in?
Zephyr Fusion was in Y Combinator's Fall 2025 batch (F25).
Is Zephyr Fusion still active?
Y Combinator lists Zephyr Fusion as active.
Where is Zephyr Fusion based?
Zephyr Fusion lists San Diego, CA, USA as its location on YC's directory.
Not affiliated with Y Combinator. From YC's public directory. Logos via logo.dev; trademarks belong to their owners.