United States · 
Who invested in RIOS?
RIOS's investors include Alumni Ventures and Main Sequence Ventures.
United States · Series B startup
Who invested in RIOS
One round we have observed, with the 2 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.
Funding summaryUpdated 26 Oct 2026
$13Mraised across 1 round since 2024, from 1 source
- Latest round
- Series B, $13MMar 2024
- Investors
- 2
The rounds
- Mar 2024
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 2 firms list RIOS 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 RIOS
How much has RIOS raised?
RIOS has raised $13M across 1 round since 2024.
When did RIOS last raise?
RIOS's most recent round was a Series B of $13M in Mar 2024.
What was RIOS's biggest round?
Its most recent round, $13M in Mar 2024, is also its largest on record.
Who backed RIOS first?
RIOS's first round on record, in Mar 2024, was backed by Alumni Ventures and Main Sequence Ventures.
What stage is RIOS at?
RIOS's latest named round is a Series B, in Mar 2024.
Where is RIOS based?
RIOS is based in the United States.
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