United States · 
Who invested in Quantum SI?
Quantum SI's investors include Redmile Group, Foresite Capital and Eldridge.
United States · Funded startup
Who invested in Quantum SI
Funding summaryUpdated 26 Oct 2026
$50Mraised across 1 round since 2025, from 1 source
- Latest round
- Round, $50MJul 2025
- Investors
- 3
The rounds
- Jul 2025
Founders and team
From Quantum SI's own website: 3 on the team.
- Jeff HawkinsPresident and Chief Executive Officer
- Jeff KeyesChief Financial Officer
- Lindsay ThompsonChief Human Resources Officer
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
This firm lists Quantum SI 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 Quantum SI
How much has Quantum SI raised?
Quantum SI has raised $50M across 1 round since 2025.
When did Quantum SI last raise?
Quantum SI's most recent round was an Undisclosed round of $50M in Jul 2025.
What was Quantum SI's biggest round?
Its most recent round, $50M in Jul 2025, is also its largest on record.
Who backed Quantum SI first?
Quantum SI's first round on record, in Jul 2025, was backed by Redmile Group, Foresite Capital and Eldridge.
What stage is Quantum SI at?
Quantum SI's latest named round is an Undisclosed round, in Jul 2025.
Where is Quantum SI based?
Quantum SI is based in the United States.
Companies like Quantum SI
In the same sector, and raised in the last eighteen months.
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