Impulse Space
Overview
Sells in-space mobility as a service: customers buy a ride beyond the orbit their launch vehicle drops them in, either hosting a payload on a Mira spacecraft or buying capacity on the Helios kick stage, plus a GEO rideshare product opening in 2027.
Moat: Vertically integrated propulsion under the engineer who built SpaceX's Merlin engine family, and the only upper-stage provider ever admitted to NSSL as a prime contractor — a structural carve-out that lets it bid national-security missions without owning a rocket.
Business
Primary customers
- Defense: US Space Force / Space Systems Command
- Government: DIU / MIT (rideshare payloads)
- Commercial: Commercial satellite operators (30+ signed agreements)
Sectors
in-space-transportation · orbital-transfer-vehicles · space-propulsion · national-security-space · geo-logistics
Last Funding Round
Key Products
- Miraoperational
Agile ~300 kg-class orbital transfer/hosting spacecraft with autonomous rendezvous and proximity ops, powered by the Saiph engine; flown three times (LEO Express-1/2/3).
First flight: 2023-11
- Heliosdevelopment
High-energy kick stage moving payloads from LEO to GEO in under a day, powered by the Deneb engine. First flight slipped from 2026 to 2027.
- Rigeldevelopment
200 lbf-class engine for landers, in-space maneuvering and rendezvous/proximity operations, unveiled 2026-04-23.
- GEO Ridesharedevelopment
Advertised economical shared-ride access to GEO riding on Helios.
Government Contracts
| Agency | Program | Amount | Year | Source |
|---|---|---|---|---|
| US Space Force — Space Systems Command | VICTUS SURGO & VICTUS SALO (Tactically Responsive Space), SBIR Phase III | $34.5M | 2024 | |
| US Space Force — Space Systems Command | NSSL Phase 3 Lane 1 IDIQ on-ramp — first-ever upper-stage prime in the program | $5M initial firm-fixed-price task order (IDIQ ceiling undisclosed) | 2026 |
Near-term Catalysts
- 2027
First Helios flight
The single event the company's valuation rests on — converts a paper kick stage into flight-proven GEO logistics.
- 2026-2027
VICTUS SURGO — first Helios launch, carrying Mira V2 onward to GTO
Proves tactically responsive high-energy maneuver for Space Systems Command.
- 2026-2027
NSSL Lane 1 capability assessment completion
Moves Impulse from on-ramped to biddable on national-security launch task orders, unlocking recurring DoD revenue.
Top Risks
- Helios has never flown — roughly $1B raised and a $4.26B valuation are underwritten by a vehicle with zero flight history, and the target date has already slipped from 2026 to 2027.
- Customer concentration in national security — TacRS and NSSL revenue is politically driven and schedule-fragile.
- Launch providers are absorbing the transfer-stage function themselves (Rocket Lab's Neutron upper stage, SpaceX's own GTO/GEO performance), risking commoditization of the kick-stage layer Impulse monetizes.
Recent Milestones
- 2026-07-09
Awarded NSSL Phase 3 Lane 1 IDIQ — first-ever upper-stage prime in the program; $5M initial task order
- 2026-06-03
$500M Series D co-led by 137 Ventures and BANNER VC; total raised passes $1B
- 2026-04-23
Unveiled Rigel, a 200 lbf-class engine for landers and rendezvous/proximity operations
- 2025-11
LEO Express-3 — third Mira flight
- 2025-06-03
$300M Series C led by Linse Capital; 30+ commercial agreements worth ~$200M disclosed
What investors should know
Q1What does Impulse Space actually sell?⌄
Q2Has Helios flown yet?⌄
Q3What is Impulse's valuation?⌄
Q4What makes Impulse different from a launch company?⌄
Q5Who founded Impulse Space?⌄
Q6What is Impulse's government contract profile?⌄
Peers
Compare side-by-side →Sources & References
Press Release
- Impulse Space · 2026-06-03
- GlobeNewswire · 2026-07-09
- Impulse Space · 2025-06-03
Trade Press
- DefenseScoop · 2024-10-04(archived)
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