# Atrium funding: rounds and investors > Atrium has raised $24M across 2 rounds since 2022. Investors include First Round Capital, CRV and Craft Ventures. Every round with its source. Source: https://millionrounds.com/company/atrium (Millionrounds; every figure on the page links to its filing or article) United States · [Seed startup](https://millionrounds.com/companies) # Who invested in *Atrium* 2 rounds we have observed, with the 6 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it. Big Data & Analytics Funding summary Updated 26 Oct 2026 **$24M** raised across 2 rounds since 2022, from 2 sources **$20M** Series A **$4.0M** Seed - **Latest round:** Seed, $4.0M Oct 2025 - **Biggest round:** $20M Series A · Jan 2022 - **Investors:** 6 See who backed them ## The funding story Each circle is a round, placed by date and sized by amount. The line above is the running total. 2022 2023 2024 2025 **$20M** Series A **$4.0M** Seed - **First round:** Series A, $20M - **Biggest round:** $20M - **Between rounds:** 3.8 years ## The rounds - **Oct 2025** Seed **$4.0M** *1 new* [Castle Island Ventures](https://millionrounds.com/fund/castle-island-ventures) Source recorded - **Jan 2022** Series A **$20M** *5 new* [First Round Capital](https://millionrounds.com/fund/first-round-capital) [CRV](https://millionrounds.com/fund/crv) [Craft Ventures](https://millionrounds.com/fund/craft-ventures) [Bonfire Ventures](https://millionrounds.com/fund/bonfire-ventures) [Bullpen Capital](https://millionrounds.com/fund/bullpen-capital) Source recorded ## 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. **Series A** 2022 **Seed** 2025 [First Round Capital](https://millionrounds.com/fund/first-round-capital) [CRV](https://millionrounds.com/fund/crv) [Craft Ventures](https://millionrounds.com/fund/craft-ventures) [Bonfire Ventures](https://millionrounds.com/fund/bonfire-ventures) [Bullpen Capital](https://millionrounds.com/fund/bullpen-capital) [Castle Island Ventures](https://millionrounds.com/fund/castle-island-ventures) ## Everyone who backed them [First Round Capital](https://millionrounds.com/fund/first-round-capital) VC firm **1** round [CRV](https://millionrounds.com/fund/crv) VC firm **1** round [Craft Ventures](https://millionrounds.com/fund/craft-ventures) VC firm **1** round [Bonfire Ventures](https://millionrounds.com/fund/bonfire-ventures) VC firm **1** round [Bullpen Capital](https://millionrounds.com/fund/bullpen-capital) VC firm **1** round [Castle Island Ventures](https://millionrounds.com/fund/castle-island-ventures) VC firm **1** round Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=atrium). ## 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. [Electric Capital](https://millionrounds.com/fund/electric-capital) VC firm Per its own site ## Quick answers about Atrium ### Who invested in Atrium? Atrium's investors include First Round Capital, CRV, Craft Ventures, Bonfire Ventures and Bullpen Capital, and 1 more on record. ### 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. ## Companies like Atrium In the same sector, and raised in the last eighteen months. [**SpaceX** $42B · Oct 2026](https://millionrounds.com/company/spacex)[**STRIVE** $1.3B · Oct 2026](https://millionrounds.com/company/strive)[**Xona** $512M · Oct 2026](https://millionrounds.com/company/xona)[**DrizzleX** $9.1M · Oct 2026](https://millionrounds.com/company/drizzlex)[**Prism Data** $25M · Oct 2026](https://millionrounds.com/company/prism-data)[**Homa** $5.0M · Oct 2026](https://millionrounds.com/company/homa) ## Find investors like these Search every investor by what they have actually funded, then narrow to your stage and market. Free. Open the investor searchOr these rounds in the app