# Sirius Therapeutics funding: rounds and investors

> Sirius Therapeutics has raised $50M across 1 round since 2025. Investors include OrbiMed. Every round with its source.

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

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

# Who invested in *Sirius Therapeutics*

One round we have observed, with the one investor 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

**$50M** raised across 1 round since 2025, from 1 source

- **Latest round:** Series B, $50M May 2025
- **Investors:** 1

See who backed them

## The rounds

- **May 2025** Series B **$50M** [OrbiMed](https://millionrounds.com/fund/orbimed) Source recorded

## Everyone who backed them

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

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

## Quick answers about Sirius Therapeutics

### Who invested in Sirius Therapeutics?

Sirius Therapeutics's investors include OrbiMed.

### How much has Sirius Therapeutics raised?

Sirius Therapeutics has raised $50M across 1 round since 2025.

### When did Sirius Therapeutics last raise?

Sirius Therapeutics's most recent round was a Series B of $50M in May 2025.

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

Its most recent round, $50M in May 2025, is also its largest on record.

### Who backed Sirius Therapeutics first?

Sirius Therapeutics's first round on record, in May 2025, was backed by OrbiMed.

### What stage is Sirius Therapeutics at?

Sirius Therapeutics's latest named round is a Series B, in May 2025.

### Where is Sirius Therapeutics based?

Sirius Therapeutics is based in the United States.

## Companies like Sirius 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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