SPACE INDEX COMPANIES INSIGHTS SECTORS PRODUCTS NEWS BLOG ANSWERS RESEARCH ABOUT FOR COMPANIES BUILD / 2026.06.04
BULL Co., Ltd. logo BULL Co., Ltd. Develops post-mission disposal devices using drag sail technology to prevent spacecraft and launch vehicle stages from becoming space debris vs Phase Four Developed electrodeless radio-frequency and multi-mode electric propulsion systems for satellites Phase Four logo
HEAD-TO-HEAD1 shared sector
BULL Co., Ltd. Phase Four
Founded 2022 2015
Headquarters Utsunomiya, Japan Hawthorne, California
Type private private
Status operating closed
Employees 40 5
Total funding $35.8M
Latest round Series C
Sectors Space Sustainability & Debris Removal, Satellite Components & Subsystems Space Propulsion, Satellite Components & Subsystems
Products listed 5 4
Federal contracts
Launches
Leaders listed Yasuhito Uto, Genryo Kanno, Eric Luvisutto Steve Kiser, M. Umair Siddiqui, Simon Halpern
News mentions 19 0
SHARED SECTORS
FREQUENTLY ASKED

How do BULL Co., Ltd. and Phase Four compare?

Both companies work in Satellite Components & Subsystems. BULL Co., Ltd. was founded in 2022 and Phase Four in 2015.

Which is larger, BULL Co., Ltd. or Phase Four?

BULL Co., Ltd. reports the larger workforce, with 40 employees versus 5.

Numbers refresh on every render against the live Space Index database. Federal contract data from USAspending.gov; launches from LaunchLibrary2.