Photo credit: Impulse Space

Impulse Space has secured $500m in Series D funding as the company looks to expand its role in the rapidly growing market for in-space mobility services. The financing round was co-led by 137 Ventures and BANNER VC and brings the company’s total capital raised to more than $1bn.

The latest investment will be used to increase hiring and expand manufacturing capabilities as Impulse scales its efforts to develop the spacecraft, propulsion systems and operational infrastructure needed to enable movement and manoeuvrability in orbit after launch.

Founded by former SpaceX propulsion chief Tom Mueller, Impulse Space has positioned itself as a specialist in orbital transportation, addressing what it sees as a major limitation in the modern space industry. While launch services have become increasingly frequent and accessible over the past decade, spacecraft often remain constrained once they reach orbit, typically operating in a single location or relying on costly and time-consuming transfer methods.

The company argues that a new generation of orbital infrastructure is required to support the next phase of space development, allowing satellites and spacecraft to move quickly, precisely and affordably across different orbits and destinations.

Impulse has already completed three missions and secured hundreds of millions of dollars in customer contracts, serving commercial, civil and government customers seeking greater flexibility in how spacecraft are deployed and operated.

Mueller said the company’s ambitions extend beyond building spacecraft, describing the effort as the creation of the economic and technical foundation needed to support humanity’s expansion into space. He said the ability to maneuver efficiently between Earth orbit, the Moon and other destinations will be a critical capability in unlocking a more advanced space economy.

The company’s current portfolio includes several spacecraft designed for different mobility missions. Its Mira vehicle, focused on precision maneuvering, has already flown multiple missions and carried out significant orbital adjustments, including autonomous rendezvous and proximity operations. Helios, a high-energy transfer vehicle scheduled for its first flight in 2027, is being developed to transport payloads to distant orbits more quickly and at lower cost than conventional methods. Meanwhile, Caravan is designed as a rideshare service aimed at reducing the cost of reaching higher-energy destinations such as geostationary orbit.

Impulse is also building a family of propulsion systems tailored to specific mission requirements. These include Saiph for precision maneuvering and orbital repositioning, Deneb for long-distance, high-energy transportation missions, and Rigel, a throttleable propulsion system intended for applications such as lunar landers and responsive spacecraft operations.

The company said several additional spacecraft and propulsion technologies are currently under development as it works toward establishing a comprehensive in-space mobility network capable of supporting future commercial and government missions throughout the solar system.

Investors backing the round said the financing reflects growing confidence that mobility after launch will become an essential layer of future space infrastructure. Justin Fishner-Wolfson, Managing Partner at 137 Ventures, said Mueller helped transform access to space during his time at SpaceX and is now tackling one of the industry’s next major challenges. He described orbital mobility as a strategic capability that will shape the future of the space economy.

Adam Ramada, Managing Partner at BANNER VC, said increasing activity in orbit is making mobility services increasingly important and described Impulse as a company building the infrastructure necessary for the next stage of growth in the space sector.

The funding round also attracted participation from Founders Fund, Lux Capital and Linse Capital.

As demand for post-launch mobility services continues to grow, Impulse plans to significantly expand its workforce and production capacity. The company has more than doubled its headcount over the past year and currently has more than 200 open positions across propulsion engineering, avionics, spacecraft systems, autonomy, manufacturing and mission operations.

In parallel with its workforce growth, Impulse has expanded its operational footprint with facilities in Redondo Beach, California; Boulder, Colorado; Washington, D.C.; and a growing testing complex in Mojave, California.

Company President and Chief Operating Officer Eric Romo said the new capital will allow Impulse to scale its operations while maintaining the speed and execution standards that have driven its growth. He added that demand for in-space mobility services remains exceptionally strong, prompting the company to accelerate both recruitment and production efforts.

With fresh funding in place and a growing portfolio of orbital transportation systems, Impulse Space is seeking to establish itself as a key infrastructure provider for the emerging space economy, where the ability to move spacecraft efficiently after launch is expected to become increasingly important.

The post Impulse Space secures $500m to expand in-space mobility business appeared first on SatellitePro ME.

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