Big round · 14 September 2026

Open Cosmos raises $346M growth round led by ETF Partners

By Millionrounds ResearchPublished 16 September 2026

Open Cosmos, based in United Kingdom, has raised $346M in a growth round led by ETF Partners and Trill Impact, announced on 14 September 2026. 9 other investors joined. It is the 159th largest equity round we recorded in the twelve months to that date, and the 62nd largest growth round of 239. The median growth round over the same period was $120M, so this one is 2.9 times that. Its previous round on record was a Series B of $50M in September 2023, 36 months earlier.

Raised$346M4 sources reported it
StageGrowth2 earlier rounds on record
Investors112 named as lead
Where GBUnited Kingdom

Aerospace & SpaceTelecoms

How big is it?

Against every equity round we recorded in the twelve months to 14 September 2026. Ranks count companies, so the same raise reported twice is counted once.

#159equity round of the last twelve months
#62growth round of 239 in that time
#10round in United Kingdom, of 309
This round$346M
Median growth round$120M

2.9 times the median growth round of the last twelve months.

Who invested

Also in the round

Funding history

  1. September 2026Growth$346M
  2. September 2023Series B$50M
  3. April 2018Series A$7.0M

$403M raised across the 3 rounds we hold.

Reported by

  1. Firms' own news pages
  2. ETF Partners14 September
  3. Tech.eu14 September
  4. Claret Capital Partners14 September

The round's figures come from these reports; each link opens the original.

Other big rounds that week

DD-Robotics$400M Series CImpulse Space$308M Series Dbarq$330M Series AExein$270M GrowthEUCLYD$231M Series AFactory$200M Growth
The companyOpen Cosmos on Millionrounds→Weekly roundupWeek of 14 September→Monthly roundupSeptember 2026→