# Theseus Pharmaceuticals funding: rounds and investors

> Theseus Pharmaceuticals has raised $100M across 1 round since 2021. Investors include OrbiMed, Foresite Capital and Omega Funds. Every round with its source.

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

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

# Who invested in *Theseus Pharmaceuticals*

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

Funding summary Updated 26 Oct 2026

**$100M** raised across 1 round since 2021, from 1 source

- **Latest round:** Series B, $100M Apr 2021
- **Investors:** 5

See who backed them

## The rounds

- **Apr 2021** Series B **$100M** [OrbiMed](https://millionrounds.com/fund/orbimed) [Foresite Capital](https://millionrounds.com/fund/forsite-capital) [Omega Funds](https://millionrounds.com/fund/omega-funds) [Longitude Capital](https://millionrounds.com/fund/longitude-capital) [Adage Capital Management](https://millionrounds.com/fund/adage-capital-management) Source recorded SEC filing: $22M sold, first sale Jun 2018

## Everyone who backed them

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

[Foresite Capital](https://millionrounds.com/fund/forsite-capital) Private equity **1** round

[Omega Funds](https://millionrounds.com/fund/omega-funds) VC firm **1** round

[Longitude Capital](https://millionrounds.com/fund/longitude-capital) VC firm **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=theseus-pharmaceuticals).

## Quick answers about Theseus Pharmaceuticals

### Who invested in Theseus Pharmaceuticals?

Theseus Pharmaceuticals's investors include OrbiMed, Foresite Capital, Omega Funds, Longitude Capital and Adage Capital Management.

### How much has Theseus Pharmaceuticals raised?

Theseus Pharmaceuticals has raised $100M across 1 round since 2021.

### When did Theseus Pharmaceuticals last raise?

Theseus Pharmaceuticals's most recent round was a Series B of $100M in Apr 2021.

### What was Theseus Pharmaceuticals's biggest round?

Its most recent round, $100M in Apr 2021, is also its largest on record.

### Who backed Theseus Pharmaceuticals first?

Theseus Pharmaceuticals's first round on record, in Apr 2021, was backed by OrbiMed, Foresite Capital and Omega Funds and 2 others.

### What stage is Theseus Pharmaceuticals at?

Theseus Pharmaceuticals's latest named round is a Series B, in Apr 2021.

## Companies like Theseus Pharmaceuticals

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

[**Cloverleaf Bio** $33M · Sept 2026](https://millionrounds.com/company/cloverleaf-bio)[**Cheiron** $8.0M · Jul 2026](https://millionrounds.com/company/cheiron)[**Tavo Biotherapeutics** $17M · Jun 2026](https://millionrounds.com/company/tavo-biotherapeutics)[**Countable Labs** $26M · May 2026](https://millionrounds.com/company/countable-labs)[**Oricell Therapeutics** $180M · Apr 2026](https://millionrounds.com/company/oricell-therapeutics)[**Immunofoco** $29M · Mar 2026](https://millionrounds.com/company/immunofoco)

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