# Lassen Therapeutics funding: rounds and investors

> Lassen Therapeutics has raised $85M across 1 round since 2023. Investors include Catalio Capital Management, Longitude Capital and Longwood Fund.

Source: https://millionrounds.com/company/lassen-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 *Lassen 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

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Funding summary Updated 27 Oct 2026

**$85M** raised across 1 round since 2023, from 1 source

- **Latest round:** Series B, $85M Dec 2023
- **Investors:** 3

See who backed them

## The rounds

- **Dec 2023** Series B **$85M** [Catalio Capital Management](https://millionrounds.com/fund/catalio-capital-management) [Longitude Capital](https://millionrounds.com/fund/longitude-capital) [Longwood Fund](https://millionrounds.com/fund/longwood-fund) Source recorded

## Everyone who backed them

[Catalio Capital Management](https://millionrounds.com/fund/catalio-capital-management) VC firm **1** round

[Longitude Capital](https://millionrounds.com/fund/longitude-capital) VC firm **1** round

[Longwood Fund](https://millionrounds.com/fund/longwood-fund) VC firm **1** round

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

## Also claim to have backed them

This firm lists Lassen Therapeutics 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.

[Alta Partners](https://millionrounds.com/fund/alta-partners) VC firm Per its own site

## Quick answers about Lassen Therapeutics

### Who invested in Lassen Therapeutics?

Lassen Therapeutics's investors include Catalio Capital Management, Longitude Capital and Longwood Fund.

### How much has Lassen Therapeutics raised?

Lassen Therapeutics has raised $85M across 1 round since 2023.

### When did Lassen Therapeutics last raise?

Lassen Therapeutics's most recent round was a Series B of $85M in Dec 2023.

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

Its most recent round, $85M in Dec 2023, is also its largest on record.

### Who backed Lassen Therapeutics first?

Lassen Therapeutics's first round on record, in Dec 2023, was backed by Catalio Capital Management, Longitude Capital and Longwood Fund.

### What stage is Lassen Therapeutics at?

Lassen Therapeutics's latest named round is a Series B, in Dec 2023.

### Where is Lassen Therapeutics based?

Lassen Therapeutics is based in the United States.

## Companies like Lassen 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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