Who invested in Siro?
Siro's investors include SignalFire, Index Ventures, StepStone Group, Fika Ventures and 01 Advisors, and 5 more on record. SignalFire led its latest round.
Who invested in Siro
One round we have observed, with the 10 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.
Follow Siro and see its new rounds in your feed. Start following
Funding summaryUpdated 5 Nov 2026
$50Mraised across 1 round since 2025, from 3 sources
- Latest round
- Series B, $50MMay 2025
- Led by
- SignalFire
- Investors
- 10 (1 led)
The rounds
- May 2025Series B$50M
SignalFireLead
Index Ventures
StepStone Group
Fika Ventures
01 Advisors- Michael Stoppelman
Dave Salvant- Ding Zhou
- Saumil Mehta
- Songe LaRon
Reported by TechCrunch and 2 others
Everyone who backed them
Michael StoppelmanVC firm1round
Ding ZhouAngel1round
Saumil MehtaGrowth equity1round
Songe LaRonAngel1round
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 2 firms list Siro 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.
Quick answers about Siro
How much has Siro raised?
Siro has raised $50M across 1 round since 2025.
When did Siro last raise?
Siro's most recent round was a Series B of $50M in May 2025, led by SignalFire.
What was Siro's biggest round?
Its most recent round, $50M in May 2025, is also its largest on record.
Who backed Siro first?
Siro's first round on record, in May 2025, was backed by SignalFire, Index Ventures and StepStone Group and 7 others.
What stage is Siro at?
Siro's latest named round is a Series B, in May 2025.
Who led Siro's rounds?
SignalFire led the Series B in 2025.
Companies like Siro
In the same sector, and raised in the last eighteen months.
Find investors like these
Search every investor by what they have actually funded, then narrow to your stage and market. Free.