# Ambros Therapeutics funding: rounds and investors

> Ambros Therapeutics has raised $125M across 1 round since 2025. Investors include RA Capital Management, Janus Henderson Investors and Adage Capital Management.

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

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

# Who invested in *Ambros Therapeutics*

One round we have observed, with the 3 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 11 months ago

Funding summary Updated 26 Oct 2026

**$125M** raised across 1 round since 2025, from 1 source

- **Latest round:** Series A, $125M Dec 2025
- **Investors:** 3

See who backed them

## The rounds

- **Dec 2025** Series A **$125M** [RA Capital Management](https://millionrounds.com/fund/ra-capital-management) [Janus Henderson Investors](https://millionrounds.com/fund/janus-henderson-investors) [Adage Capital Management](https://millionrounds.com/fund/adage-capital-management) Source recorded

## Founders and team

From Ambros Therapeutics's own website: 4 on the team.

- **Jay Hagan** Ambros Therapeutics Chief Executive Officer
- **Cris Calsada** Chief Financial Officer
- **Christopher Aker** General Counsel
- **Keith Katkin** Chairman of Ambros Therapeutics

## Everyone who backed them

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

[Janus Henderson Investors](https://millionrounds.com/fund/janus-henderson-investors) Private equity **1** round

[Adage Capital Management](https://millionrounds.com/fund/adage-capital-management) Asset manager **1** round

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

## Quick answers about Ambros Therapeutics

### Who invested in Ambros Therapeutics?

Ambros Therapeutics's investors include RA Capital Management, Janus Henderson Investors and Adage Capital Management.

### How much has Ambros Therapeutics raised?

Ambros Therapeutics has raised $125M across 1 round since 2025.

### When did Ambros Therapeutics last raise?

Ambros Therapeutics's most recent round was a Series A of $125M in Dec 2025.

### What was Ambros Therapeutics's biggest round?

Its most recent round, $125M in Dec 2025, is also its largest on record.

### Who backed Ambros Therapeutics first?

Ambros Therapeutics's first round on record, in Dec 2025, was backed by RA Capital Management, Janus Henderson Investors and Adage Capital Management.

### What stage is Ambros Therapeutics at?

Ambros Therapeutics's latest named round is a Series A, in Dec 2025.

### Where is Ambros Therapeutics based?

Ambros Therapeutics is based in the United States.

## Companies like Ambros Therapeutics

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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