Impulse Space Secures $308M Extension at $5.4B Valuation
Impulse Space added $308 million to its Series D funding, bringing the round to $808 million. The company's valuation reportedly rose to $5.4 billion for this extension.
Impulse Space has raised a $308 million extension to its Series D funding round, bringing the total for the round to $808 million. The company's valuation for this extension has reportedly risen to $5.4 billion, according to a source close to the company speaking to reporters, up from the $4.26 billion valuation set in June when the initial $500 million was announced.
Founder and CEO Tom Mueller told Payload the extension reflects strong customer and investor demand, as well as recent business momentum. The funding round saw participation from returning investors including 137 Ventures, BANNER VC, DFJ Growth, Linse Capital, Lux Capital, and Valor Equity Partners.
Building the Fleet
Much of the new capital will be directed toward building Impulse's lineup of in-space mobility vehicles. The company offers a range of propulsion systems, from high-thrust chemical to low-thrust electric, designed to provide end-to-end mobility services after a satellite reaches orbit.
Its fleet includes the Mira maneuvering vehicle, the high-energy Helios kick stage, and the new Electra electric-propulsion system. The company has sold out its Caravan 2 and 3 Helios rideshare missions scheduled for 2028.
"That first [Helios] flight is really the starting point and not the finish line," Mueller said. He noted that in addition to years of Caravan missions, Helios will support dedicated flights for customers like Astranis and SES. Production is scaling up, with about half a dozen Mira vehicles currently in the factory and plans to increase Helios production.
| Vehicle | Type | Key Detail | Next Milestone |
|---|---|---|---|
| Mira | Maneuvering Vehicle | LEO-2 and LEO-3 recently flew within ~200 meters of each other. | Fourth flight, LEO Express 4. |
| Helios | High-Energy Kick Stage | Designed to move payloads from LEO to GEO in under a day. | First launch slated for 2027. |
| Electra | Electric-Propulsion System | Complements chemical engines to widen mission range. | New system development. |
Expanding National Security Work
The funding arrives as Impulse Space's role in national security missions grows. In July, Space Systems Command (SSC) awarded the company a National Security Space Launch (NSSL) Phase 3 Lane 1 contract, making Impulse the program's first upper-stage prime contractor.
In August, SSC's Space Safari Office awarded Impulse a $28 million SBIR Phase III contract extension to support the VICTUS SALO 2 and 3 missions. This builds on existing contracts for the Mira vehicle. Also, in May, defense technology company Anduril selected Impulse as a partner for its Space Force space-based interceptor program, known as Golden Dome.
Strengthening Leadership
With business "really booming," according to Mueller, Impulse has hired its first Chief Financial Officer. The company appointed Adam Townsend, formerly the CFO and head of HR operations at smart TV company VIZIO, to the role.
Mueller said Townsend's experience will be valuable as the company focuses on building its business, executing for customers, and meeting demand in the long term. The new funding will be spent chiefly on hiring and manufacturing to support the company's expanding vehicle production and mission manifest.
