Big round · 8 October 2026

Arena raises $200M Series B led by Lightspeed Venture Partners

By Millionrounds ResearchPublished 9 October 2026

Arena, based in United States, has raised $200M in a Series B led by Lightspeed Venture Partners and Khosla Ventures, announced on 8 October 2026. 6 other investors joined. It is the 253rd largest equity round we recorded in the twelve months to that date, and the 40th largest Series B of 405. The median Series B over the same period was $50M, so this one is 4.0 times that. Its previous round on record was a Series A of $150M in January 2026, 9 months earlier.

Raised$200M3 sources reported it
StageSeries B6 earlier rounds on record
Investors82 named as lead
Where USUnited States

AI

How big is it?

Against every equity round we recorded in the twelve months to 8 October 2026. Ranks count companies, so the same raise reported twice is counted once.

#253equity round of the last twelve months
#40Series B of 405 in that time
#168round in United States, of 1,161
This round$200M
Median Series B$50M

4.0 times the median Series B of the last twelve months.

Who invested

Also in the round

Funding history

  1. October 2026Series B$200M
  2. January 2026Series A$150M
  3. April 2025Series B$30M
  4. June 2023Seed$750K
  5. January 2023Pre-seed$1.2M
  6. March 2022Series A$14M
  7. July 2021Seed$5.2M

$401M raised across the 7 rounds we hold.

Reported by

  1. Firms' own news pages
  2. Leap Ventures8 October
  3. TechStartups9 October

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

Other big rounds that week

TypeSafe AI$870M Series AOxide$445M Series DVEIR$110M Series CDeepSeek$15B Series BMManus / Butterfly Effect$500M GrowthOratomic$475M Series B
The companyArena on Millionrounds→Weekly roundupWeek of 5 October→Monthly roundupOctober 2026→