# Definium Therapeutics funding: rounds and investors

> Definium Therapeutics has raised $805M across 1 round since 2026. Investors include Janus Henderson Investors and CIBC. Every round with its source.

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

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

# Who invested in *Definium Therapeutics*

One round we have observed, with the 2 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 5 months ago

Funding summary Updated 26 Oct 2026

**$805M** raised across 1 round since 2026, from 1 source

- **Latest round:** Round, $805M Jun 2026
- **Investors:** 2

See who backed them

## The rounds

- **Jun 2026** Round **$805M** [Janus Henderson Investors](https://millionrounds.com/fund/janus-henderson-investors) [CIBC](https://millionrounds.com/fund/cibc) Source recorded

## Founders and team

From Definium Therapeutics's own website: 2 on the team.

- **Robert Barrow** Chief Executive Officer and Board Director
- **Matt Wiley** Chief Commercial Officer

## Everyone who backed them

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

[CIBC](https://millionrounds.com/fund/cibc) VC firm **1** round

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

## Quick answers about Definium Therapeutics

### Who invested in Definium Therapeutics?

Definium Therapeutics's investors include Janus Henderson Investors and CIBC.

### How much has Definium Therapeutics raised?

Definium Therapeutics has raised $805M across 1 round since 2026.

### When did Definium Therapeutics last raise?

Definium Therapeutics's most recent round was an Undisclosed round of $805M in Jun 2026.

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

Its most recent round, $805M in Jun 2026, is also its largest on record.

### Who backed Definium Therapeutics first?

Definium Therapeutics's first round on record, in Jun 2026, was backed by Janus Henderson Investors and CIBC.

### What stage is Definium Therapeutics at?

Definium Therapeutics's latest named round is an Undisclosed round, in Jun 2026.

### Where is Definium Therapeutics based?

Definium Therapeutics is based in the United States.

## Companies like Definium 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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