Impulse Space Raises $500M Series D to Build In-Space Mobility Infrastructure for the Space Economy

Impulse Space, the in-space mobility leader, led by Tom Mueller and the team, has raised $500 million in Series D funding, co-led by 137 Ventures and BANNER VC, bringing the company’s total capital raised to over $1 billion. Additional participating investors include Founder’s Fund, Lux Capital, and Linse Capital.

Scaling Infrastructure for In-Space Mobility.

The funding will support team expansion and manufacturing growth as Impulse Space accelerates development of in-space transportation infrastructure, including spacecraft, propulsion systems, and the operational capabilities required to move payloads after launch.

Having already completed three missions and secured hundreds of millions of dollars in customer contracts, the company is expanding to meet growing demand for in-space mobility services across commercial, civil, and government markets.

Building the Next Layer of Space Infrastructure.

As access to launch services has improved, mobility after reaching orbit has remained a significant constraint for many spacecraft. Missions are often limited by fixed orbital destinations or slow and costly transfer options, reducing flexibility once in space.

Impulse Space is focused on solving this challenge by developing spacecraft specifically designed for in-space mobility. These vehicles enable payloads and spacecraft to be placed, repositioned, and operated more efficiently after launch, creating greater flexibility for commercial, civil, and government missions across Earth orbit, the Moon, and beyond.

The company views advanced in-space transportation as a foundational capability for the next phase of the space economy, providing the infrastructure needed to support more complex and ambitious space operations in the years ahead.

Expanding a Full-Stack In-Space Mobility Platform.

Impulse Space is developing a portfolio of spacecraft and propulsion systems designed to address a wide range of in-space transportation needs. Its Mira spacecraft has already completed multiple missions, demonstrating capabilities such as precision orbital maneuvers and autonomous rendezvous operations.

The company is also advancing Helios, a high-energy transfer vehicle planned for its first flight in 2027, and Caravan, a rideshare program intended to provide more affordable access to higher-energy destinations such as geostationary orbit (GEO). Complementing these vehicles is a growing family of propulsion systems optimized for applications ranging from orbital repositioning to long-distance transport and spacecraft landing operations.

Together, these platforms form the foundation of Impulse’s broader vision: building the infrastructure required to make movement throughout space faster, more flexible, and increasingly routine.

Investors See In-Space Mobility as Critical Infrastructure.

The Series D financing reflects growing belief among investors that transportation and maneuverability after launch will become a foundational component of the future space economy. As activity in Earth orbit and beyond continues to increase, the ability to move spacecraft efficiently between destinations is emerging as a critical capability for commercial, civil, and government missions.

Investors including 137 Ventures and BANNER VC highlighted Impulse Space’s role in developing the infrastructure needed to support the next generation of space operations. The firm's backers view in-space mobility as a strategic layer of the space ecosystem, with the potential to enable new mission architectures, expand economic activity in orbit, and accelerate humanity’s long-term presence beyond Earth.

Scaling Operations to Meet Growing Demand.

The new funding will support workforce expansion and increased manufacturing capacity as Impulse Space responds to rising demand for post-launch transportation services. The company has more than doubled its headcount over the past year and is actively hiring across engineering, manufacturing, autonomy, propulsion, and mission operations functions.

To support this growth, Impulse has expanded its operational footprint with facilities in Redondo Beach, Boulder, Washington, and a growing test site in Mojave. The expansion is intended to increase production capacity while maintaining the pace and quality of execution as the company scales its in-space mobility platform.