Impulse Space raises $500M at over $4.2B valuation

Investing.com -- Impulse Space raised $500 million in a Series D funding round, the company announced Tuesday. The round values the startup at $4.26 billion, including the investment.

The round was co-led by 137 Ventures and Banner VC, with participation from existing investors including Founders Fund and Linse Capital.

Led by Tom Mueller, an early SpaceX employee, Impulse Space has raised roughly $1 billion since launching in 2021. The company develops space tugs, spacecraft designed to transport satellites across different orbits.

Impulse Space operates two vehicles. The Mira craft has completed three missions, with the most recent launch in November 2025. The larger Helios vehicle, capable of maneuvering heavier payloads, is scheduled to begin flying in 2027.

The company plans to use the new funds to expand its team and manufacturing capacity. Over the past year, Impulse Space has more than doubled its headcount and opened branches in Washington, DC and Boulder, Colorado.

Impulse Space is developing propulsion systems to enable spacecraft to perform specific functions, including long-distance transport, landing, and orbital position changes.

The company is working with partners to support Anduril Industries Inc. in creating prototypes of space-based interceptors for President Donald Trump's Golden Dome missile defense shield, a layered defense system designed to protect the US from foreign attacks.

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