# Small Door funding: rounds and investors

> Small Door has raised $35M across 1 round since 2025. Investors include Alumni Ventures, Lerer Hippeau and Ring Capital. Every round with its source.

Source: https://millionrounds.com/company/small-door (Millionrounds; every figure on the page links to its filing or article)

United States · [Series C startup](https://millionrounds.com/companies)

# Who invested in *Small Door*

One round we have observed, with the 8 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.

Healthcare

Funding summary Updated 26 Oct 2026

**$35M** raised across 1 round since 2025, from 1 source

- **Latest round:** Series C, $35M Jul 2025
- **Investors:** 8

See who backed them

## The rounds

- **Jul 2025** Series C **$35M** [Alumni Ventures](https://millionrounds.com/fund/us-strategic-tech-fund-an-alumni-ventures-fund) [Lerer Hippeau](https://millionrounds.com/fund/lerer-hippeau) [Ring Capital](https://millionrounds.com/fund/ring) [Primary Venture Partners](https://millionrounds.com/fund/primary-venture-partners) [Declaration Partners](https://millionrounds.com/fund/declaration-partners) [Brand Foundry Ventures](https://millionrounds.com/fund/brand-foundry-ventures) [Toba Capital](https://millionrounds.com/fund/toba-capital) [Valspring Capital](https://millionrounds.com/fund/valspring-capital) Reported by AlleyWatch

## Everyone who backed them

[Alumni Ventures](https://millionrounds.com/fund/us-strategic-tech-fund-an-alumni-ventures-fund) VC firm **1** round

[Lerer Hippeau](https://millionrounds.com/fund/lerer-hippeau) VC firm **1** round

[Ring Capital](https://millionrounds.com/fund/ring) VC firm **1** round

[Primary Venture Partners](https://millionrounds.com/fund/primary-venture-partners) VC firm **1** round

[Declaration Partners](https://millionrounds.com/fund/declaration-partners) Family office **1** round

[Brand Foundry Ventures](https://millionrounds.com/fund/brand-foundry-ventures) VC firm **1** round

[Toba Capital](https://millionrounds.com/fund/toba-capital) VC firm **1** round

[Valspring Capital](https://millionrounds.com/fund/valspring-capital) VC firm **1** round

Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=small-door).

## Also claim to have backed them

These 2 firms list Small Door 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.

[Sugar Capital](https://millionrounds.com/fund/sugar-capital) VC firm Per its own site

[Westway Capital](https://millionrounds.com/fund/westway-capital-llc) VC firm Per its own site

## Quick answers about Small Door

### Who invested in Small Door?

Small Door's investors include Alumni Ventures, Lerer Hippeau, Ring Capital, Primary Venture Partners and Declaration Partners, and 3 more on record.

### How much has Small Door raised?

Small Door has raised $35M across 1 round since 2025.

### When did Small Door last raise?

Small Door's most recent round was a Series C of $35M in Jul 2025.

### What was Small Door's biggest round?

Its most recent round, $35M in Jul 2025, is also its largest on record.

### Who backed Small Door first?

Small Door's first round on record, in Jul 2025, was backed by Alumni Ventures, Lerer Hippeau and Ring Capital and 5 others.

### What stage is Small Door at?

Small Door's latest named round is a Series C, in Jul 2025.

### Where is Small Door based?

Small Door is based in the United States.

## Companies like Small Door

In the same sector, and raised in the last eighteen months.

[**Star Therapeutics** $325M · Oct 2026](https://millionrounds.com/company/star-therapeutics)[**Promaxo** $106M · Oct 2026](https://millionrounds.com/company/promaxo)[**AI** $18M · Oct 2026](https://millionrounds.com/company/ai)[**Baba** $40M · Oct 2026](https://millionrounds.com/company/baba)[**Rejuvenate Bio** $13M · Oct 2026](https://millionrounds.com/company/rejuvenate-bio)[**Clinical Ink** $24M · Oct 2026](https://millionrounds.com/company/clinical-ink)

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