# Third Harmonic Bio funding: rounds and investors

> Third Harmonic Bio has raised $3.9M across 1 round since 2025. Investors include OrbiMed, RA Capital Management and General Atlantic.

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

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

# Who invested in *Third Harmonic Bio*

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

**$3.9M** raised across 1 round since 2025, from 1 source

- **Latest round:** Round, $3.9M Jan 2025
- **Investors:** 4

See who backed them

## The rounds

- **Jan 2025** Round **$3.9M** [OrbiMed](https://millionrounds.com/fund/orbimed) [RA Capital Management](https://millionrounds.com/fund/ra-capital-management) [General Atlantic](https://millionrounds.com/fund/general-atlantic) [RTW Investments LLC](https://millionrounds.com/fund/rtw-investments-lp) Source recorded

## Everyone who backed them

[OrbiMed](https://millionrounds.com/fund/orbimed) Private equity **1** round

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

[General Atlantic](https://millionrounds.com/fund/general-atlantic) Private equity **1** round

[RTW Investments LLC](https://millionrounds.com/fund/rtw-investments-lp) Growth equity **1** round

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

## Also claim to have backed them

This firm lists Third Harmonic Bio 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.

[Atlas Venture](https://millionrounds.com/fund/atlas-venture) VC firm Per its own site

## Quick answers about Third Harmonic Bio

### Who invested in Third Harmonic Bio?

Third Harmonic Bio's investors include OrbiMed, RA Capital Management, General Atlantic and RTW Investments LLC.

### How much has Third Harmonic Bio raised?

Third Harmonic Bio has raised $3.9M across 1 round since 2025.

### When did Third Harmonic Bio last raise?

Third Harmonic Bio's most recent round was an Undisclosed round of $3.9M in Jan 2025.

### What was Third Harmonic Bio's biggest round?

Its most recent round, $3.9M in Jan 2025, is also its largest on record.

### Who backed Third Harmonic Bio first?

Third Harmonic Bio's first round on record, in Jan 2025, was backed by OrbiMed, RA Capital Management and General Atlantic and 1 others.

### What stage is Third Harmonic Bio at?

Third Harmonic Bio's latest named round is an Undisclosed round, in Jan 2025.

### Where is Third Harmonic Bio based?

Third Harmonic Bio is based in the United States.

## Companies like Third Harmonic Bio

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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