# Ansa Biotechnologies funding: rounds and investors

> Ansa Biotechnologies has raised $45M across 1 round since 2025. Investors include Y Combinator, National Science Foundation and RA Capital Management.

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

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

# Who invested in *Ansa Biotechnologies*

One round we have observed, with the 4 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

Funding summary Updated 26 Oct 2026

**$45M** raised across 1 round since 2025, from 1 source

- **Latest round:** Series B, $45M Oct 2025
- **Investors:** 4

See who backed them

## The rounds

- **Oct 2025** Series B **$45M** [Y Combinator](https://millionrounds.com/fund/y-combinator) [National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) [RA Capital Management](https://millionrounds.com/fund/ra-capital-management) [Fifty Years](https://millionrounds.com/fund/fifty-years-industries-llc) Source recorded SEC filing: $45M sold, first sale Jun 2024

## Everyone who backed them

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

[National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) Government **1** round

[RA Capital Management](https://millionrounds.com/fund/ra-capital-management) Private equity **1** round

[Fifty Years](https://millionrounds.com/fund/fifty-years-industries-llc) VC firm **1** round

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

## Also claim to have backed them

This firm lists Ansa Biotechnologies 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.

[Carbon Silicon Ventures](https://millionrounds.com/fund/carbon-silicon-ventures) VC firm Per its own site

## Quick answers about Ansa Biotechnologies

### Who invested in Ansa Biotechnologies?

Ansa Biotechnologies's investors include Y Combinator, National Science Foundation, RA Capital Management and Fifty Years.

### How much has Ansa Biotechnologies raised?

Ansa Biotechnologies has raised $45M across 1 round since 2025.

### When did Ansa Biotechnologies last raise?

Ansa Biotechnologies's most recent round was a Series B of $45M in Oct 2025.

### What was Ansa Biotechnologies's biggest round?

Its most recent round, $45M in Oct 2025, is also its largest on record.

### Who backed Ansa Biotechnologies first?

Ansa Biotechnologies's first round on record, in Oct 2025, was backed by Y Combinator, National Science Foundation and RA Capital Management and 1 others.

### What stage is Ansa Biotechnologies at?

Ansa Biotechnologies's latest named round is a Series B, in Oct 2025.

### Where is Ansa Biotechnologies based?

Ansa Biotechnologies is based in the United States.

## Companies like Ansa Biotechnologies

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)

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