United States · Series C startup
7 rounds we have observed, with the 26 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.
Raised 6 months ago
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Funding summaryUpdated 5 Nov 2026
$237Mraised across 7 rounds since 2018, from 7 sources
Each circle is a round, placed by date and sized by amount. The line above is the running total.
Reported by VentureburnSEC filing: $205K sold
Source recorded
Source recordedSEC filing: $13M sold, first sale May 2022
Source recordedSEC filing: $13M sold, first sale May 2022
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
Khosla Ventures
Founders Fund
Village Global
K5 Global
SofinaL
Y Combinator
Alumni Ventures
Accel
Gaingels
Salesforce VenturesMissing a round, or an investor who was in one? Tell us.
These 13 firms list Primer as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.
Primer's investors include Khosla Ventures, Founders Fund, Village Global, K5 Global and Sofina, and 21 more on record. Sofina led its latest round.
Primer has raised $237M across 7 rounds since 2018.
Primer's most recent round was a Series C of $100M in May 2026, led by Sofina.
Its most recent round, $100M in May 2026, is also its largest on record.
Primer's first round on record, in Nov 2018, was backed by Mubadala and Lux Capital/ Section 32.
Primer's latest named round is a Series C, in May 2026.
Primer is based in the United States.
Sofina led the Series C in 2026.
In the same sector, and raised in the last eighteen months.
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United States · 
