Who invested in Circleback

2 rounds we have observed, with the 8 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.

Funding summaryUpdated 26 Oct 2026

$15Mraised across 2 rounds since 2015, from 2 sources

$12MVenture$2.5MSeed

Latest round: Seed, $2.5MNov 2024
Biggest round: $12MVenture · Jul 2015
Investors: 8

See who backed them

The funding story

Each circle is a round, placed by date and sized by amount. The line above is the running total.

20152017201920212023

$12MVenture$2.5MSeed

First round: Venture, $12M
Biggest round: $12M
Between rounds: 9.3 years

The rounds

Nov 2024
Seed$2.5M4 new
Source recorded
Jul 2015
Venture$12M4 new
From a historical funding record

Who was in which round

The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.

Venture2015Seed2024

Y Combinator

Pioneer Fund

Rebel Fund

Grotech VenturesTranspose Platform Management

TDF VenturesSyncom Venture Partners

Clark Enterprises

Everyone who backed them

Y CombinatorAccelerator1round

Pioneer FundPrivate equity1round

Rebel FundVC firm1round

Grotech VenturesVC firm1round

Transpose Platform ManagementVC firm1round

TDF VenturesVC firm1round

Syncom Venture PartnersVC firm1round

Clark EnterprisesPrivate equity1round

Missing a round, or an investor who was in one? Tell us.

Also claim to have backed them

These 2 firms list Circleback 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.