# Impulse Space Raises $308M Series D Extension at ~$5.4B Valuation

On September 16, 2026, per Impulse Space, spacecraft, propulsion and in-orbit transportation company raised $308M in a Series D extension, bringing the round to $808M total at a valuation of about $5.4B. The company was founded by Tom Mueller, former SpaceX propulsion systems lead.



Canonical: https://uniquebase.ai/news/0d55fffd-65ab-454d-8f66-b4f433cd1517
Stable identifier: 0d55fffd-65ab-454d-8f66-b4f433cd1517
Snapshot captured: 2026-10-20T18:19:32.670Z
English updated: 2026-10-20T18:21:32.462Z

## Connected profiles

- [Impulse Space](/companies/impulse-space)

## Sources

- https://www.impulsespace.com/updates/impulse-space-announces-308-million-series-d-extension-to-meet-