# H1.co funding: rounds and investors

> H1.co has raised across 1 round since 2026. Investors include Y Combinator, Menlo Ventures and Lux Capital. Every round with its source.

Source: https://millionrounds.com/company/h1-co (Millionrounds; every figure on the page links to its filing or article)

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

# Who invested in *H1.co*

One round we have observed, with the 5 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.

Biotech

Raised 6 months ago Valuation: $773M, Oct 2024 Y Combinator: W20

Funding summary Updated 26 Oct 2026

**Undisclosed** raised across 1 round since 2026, from 1 source

- **Latest round:** Venture May 2026
- **Investors:** 5

See who backed them

## The rounds

- **May 2026** Venture **Amount undisclosed** [Y Combinator](https://millionrounds.com/fund/y-combinator) [Menlo Ventures](https://millionrounds.com/fund/menlo-ventures) [Lux Capital](https://millionrounds.com/fund/lux-capital) [IVP](https://millionrounds.com/fund/ivp) [Flex Capital](https://millionrounds.com/fund/flex-capital) Source recorded

## Founders and team

From H1.co's own website: 2 founders, 2 on the team.

**Ariel Katz** Co-Founder & CEO

**Ian Sax** Co-Founder & President

- **Karen Walker** Board Member Eli Lilly and Company
- **Somesh Dash** General Partner IVP

## Everyone who backed them

[Y Combinator](https://millionrounds.com/fund/y-combinator) Accelerator **1** round

[Menlo Ventures](https://millionrounds.com/fund/menlo-ventures) VC firm **1** round

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

[IVP](https://millionrounds.com/fund/ivp) VC firm **1** round

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

Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=h1-co).

## Quick answers about H1.co

### Who invested in H1.co?

H1.co's investors include Y Combinator, Menlo Ventures, Lux Capital, IVP and Flex Capital.

### How much has H1.co raised?

H1.co has raised 1 round since 2026, none with a disclosed amount.

### When did H1.co last raise?

H1.co's most recent round was a Venture in May 2026.

### Who backed H1.co first?

H1.co's first round on record, in May 2026, was backed by Y Combinator, Menlo Ventures and Lux Capital and 2 others.

### What stage is H1.co at?

H1.co's latest named round is a Venture, in May 2026.

### Where is H1.co based?

H1.co is based in the United States.

## Companies like H1.co

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)[**Prolific Machines** $105M · Oct 2026](https://millionrounds.com/company/prolific-machines)[**IMIO** $19M · Oct 2026](https://millionrounds.com/company/imio)[**Clinical Ink** $24M · Oct 2026](https://millionrounds.com/company/clinical-ink)[**Rejuvenate Bio** $13M · Oct 2026](https://millionrounds.com/company/rejuvenate-bio)

## Find investors like these

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