United States · 
Who invested in Proof?
Proof's investors include Andreessen Horowitz, SV Angel, Polaris Partners, True Ventures and NAP, and 8 more on record.
20172019202120232025
$2.0MSeed$50MSeries A$16MVenture
United States · Venture startup
Who invested in Proof
Funding summaryUpdated 26 Oct 2026
$68Mraised across 3 rounds since 2017, from 3 sources
$2.0MSeed$50MSeries A$16MVenture
- Latest round
- Venture, $16MNov 2025
- Biggest round
- $50MSeries A · Aug 2022
- Investors
- 13
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Seed, $2.0M Jan 2017
- Biggest round
- $50M Series A · Aug 2022
- Usual gap between rounds
- 5.5 years the median of 2
The rounds
- Nov 2025Venture$16M6 new
Source recordedSEC filing: $20M sold, first sale Aug 2025
- Aug 2022
- Jan 2017
Founders and team
From Proof's own website: 1 founder, 7 on the team.
John BackusCo-Founder
- Maggie VaronaChief Financial Officer
- Bryan CiambellaGeneral Partner
- Ha DaoAssociate
- Jennifer SchretterGeneral Partner - Secondaries
- Melanie NessController
- Michael ZarlengaGeneral Counsel
- Prince Khaled Bin AlwaleedGeneral Partner - International
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.
Everyone who backed them
High West Venture Partnersno record of our own yet1round
The Scibetta Fundno record of our own yet1round
Vaulting Venturesno record of our own yet1round
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 11 firms list Proof 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 Proof
How much has Proof raised?
Proof has raised $68M across 3 rounds since 2017.
When did Proof last raise?
Proof's most recent round was a Venture of $16M in Nov 2025.
What was Proof's biggest round?
Proof's largest round on record is $50M (Series A), in Aug 2022.
Who backed Proof first?
Proof's first round on record, in Jan 2017, was backed by High West Venture Partners, The Scibetta Fund and Vaulting Ventures.
What stage is Proof at?
Proof's latest named round is a Venture, in Nov 2025.
Where is Proof based?
Proof is based in the United States.
Companies like Proof
In the same sector, and raised in the last eighteen months.
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