Big round · 18 August 2026

W

Wispr raises $280M Series B led by Menlo Ventures

By Millionrounds ResearchPublished 16 September 2026

Wispr, based in United States, has raised $280M in a Series B led by Menlo Ventures, announced on 18 August 2026. 23 other investors joined. It is the 192nd largest equity round we recorded in the twelve months to that date, and the 25th largest Series B of 387. The median Series B over the same period was $50M, so this one is 5.6 times that. Its previous round on record was a Series A of $25M in November 2025, 9 months earlier.

Raised$280M3 sources reported it
StageSeries B1 earlier round on record
Investors241 named as lead
Where USUnited States

AISoftware

How big is it?

Against every equity round we recorded in the twelve months to 18 August 2026. Ranks count companies, so the same raise reported twice is counted once.

#192equity round of the last twelve months
#25Series B of 387 in that time
#134round in United States, of 1,098
This round$280M
Median Series B$50M

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

Who invested

Also in the round

Funding history

  1. August 2026Series B$280M
  2. November 2025Series A$25M

$305M raised across the 2 rounds we hold.

Reported by

  1. TechCrunch17 August
  2. TechStartups17 August
  3. Ventureburn18 August

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

Other big rounds that week

Starcloud$250M Series ACastelion$800M Series CMuon Space$250M Series CCallosum$100M SeedGroq$350M Series AAlso$150M Series D
The companyWispr on Millionrounds→Weekly roundupWeek of 17 August→Monthly roundupAugust 2026→