# Call9 funding: rounds and investors

> Call9 has raised $24M across 1 round since 2017. Investors include Y Combinator, Refactor Capital and Redmile/ Index. Every round with its source.

Source: https://millionrounds.com/company/call9 (Millionrounds; every figure on the page links to its filing or article)

United States · [Series B startup](https://millionrounds.com/companies)

# 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.

Biotech Healthcare

Y Combinator: S15

Funding summary Updated 26 Oct 2026

**$24M** raised across 1 round since 2017, from 1 source

- **Latest round:** Series B, $24M Sept 2017
- **Investors:** 4

See who backed them

## The rounds

- **Sept 2017** Series B **$24M** [Y Combinator](https://millionrounds.com/fund/y-combinator) [Refactor Capital](https://millionrounds.com/fund/refactor-capital) Redmile/ Index Western Technology Reported by FinSMEs

## Everyone who backed them

[Y Combinator](https://millionrounds.com/fund/y-combinator) Accelerator **1** round

[Refactor Capital](https://millionrounds.com/fund/refactor-capital) VC firm **1** round

Redmile/ Index no record of our own yet **1** round

Western Technology no record of our own yet **1** round

Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=call9).

## 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.

[Westway Capital](https://millionrounds.com/fund/westway-capital-llc) VC firm Per its own site

## Quick answers about Call9

### Who invested in Call9?

Call9's investors include Y Combinator, Refactor Capital, Redmile/ Index and Western Technology.

### 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.

[**Star Therapeutics** $325M · Oct 2026](https://millionrounds.com/company/star-therapeutics)[**Promaxo** $106M · Oct 2026](https://millionrounds.com/company/promaxo)[**Prolific Machines** $105M · Oct 2026](https://millionrounds.com/company/prolific-machines)[**AI** $18M · Oct 2026](https://millionrounds.com/company/ai)[**Baba** $40M · Oct 2026](https://millionrounds.com/company/baba)[**IMIO** $19M · Oct 2026](https://millionrounds.com/company/imio)

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