United States · 
Who invested in Call9?
Call9's investors include Y Combinator, Refactor Capital, Redmile/ Index and Western Technology.
United States · Series B startup
Who invested in Call9
One round we have observed, with the 4 investors named in it. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.
Y Combinator: S15
Funding summaryUpdated 26 Oct 2026
$24Mraised across 1 round since 2017, from 1 source
- Latest round
- Series B, $24MSept 2017
- Investors
- 4
The rounds
- Sept 2017
Everyone who backed them
Redmile/ Indexno record of our own yet1round
Western Technologyno record of our own yet1round
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
This firm lists Call9 as a portfolio company on their own website, but no report of a round names it. They are the firms' own claims, kept apart from the rounds above.
Quick answers about Call9
How much has Call9 raised?
Call9 has raised $24M across 1 round since 2017.
When did Call9 last raise?
Call9's most recent round was a Series B of $24M in Sept 2017.
What was Call9's biggest round?
Its most recent round, $24M in Sept 2017, is also its largest on record.
Who backed Call9 first?
Call9's first round on record, in Sept 2017, was backed by Y Combinator, Refactor Capital and Redmile/ Index and 1 others.
What stage is Call9 at?
Call9's latest named round is a Series B, in Sept 2017.
Where is Call9 based?
Call9 is based in the United States.
Companies like Call9
In the same sector, and raised in the last eighteen months.
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