United States · 
Who invested in Atrium?
Atrium's investors include First Round Capital, CRV, Craft Ventures, Bonfire Ventures and Bullpen Capital, and 1 more on record.
2022202320242025
$20MSeries A$4.0MSeed
United States · Seed startup
Who invested in Atrium
Funding summaryUpdated 26 Oct 2026
$24Mraised across 2 rounds since 2022, from 2 sources
$20MSeries A$4.0MSeed
- Latest round
- Seed, $4.0MOct 2025
- Biggest round
- $20MSeries A · Jan 2022
- Investors
- 6
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Series A, $20M Jan 2022
- Biggest round
- $20M Series A · Jan 2022
- Between rounds
- 3.8 years from the last two
The rounds
- Oct 2025
- Jan 2022
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
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
This firm lists Atrium 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 Atrium
How much has Atrium raised?
Atrium has raised $24M across 2 rounds since 2022.
When did Atrium last raise?
Atrium's most recent round was a Seed of $4.0M in Oct 2025.
What was Atrium's biggest round?
Atrium's largest round on record is $20M (Series A), in Jan 2022.
Who backed Atrium first?
Atrium's first round on record, in Jan 2022, was backed by First Round Capital, CRV and Craft Ventures and 2 others.
What stage is Atrium at?
Atrium's latest named round is a Seed, in Oct 2025.
Where is Atrium based?
Atrium is based in the United States.
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