# Firefly Bio funding: rounds and investors

> Firefly Bio has raised $94M across 1 round since 2024. Investors include Versant Ventures and Eli Lilly. Every round with its source.

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

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

# Who invested in *Firefly Bio*

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

Funding summary Updated 26 Oct 2026

**$94M** raised across 1 round since 2024, from 1 source

- **Latest round:** Series A, $94M Feb 2024
- **Investors:** 2

See who backed them

## The rounds

- **Feb 2024** Series A **$94M** [Versant Ventures](https://millionrounds.com/fund/versant-ventures) [Eli Lilly](https://millionrounds.com/fund/eli-lilly) Source recorded SEC filing: $40M sold, first sale Dec 2023

## Founders and team

From the SEC filings it signed: 3 on the team.

- **Bernhard Geierstanger** Executive Officer i
- **John Flygare** Executive Officer i
- **Scott Hirsch** Executive Officer, Director i

On the board, as filed i *Alexander Mayweg* *Jerel Davis* *Pankaj Bhargava* *Peter Colabuono* *Todd Foley*

## Everyone who backed them

[Versant Ventures](https://millionrounds.com/fund/versant-ventures) VC firm **1** round

[Eli Lilly](https://millionrounds.com/fund/eli-lilly) Corporate VC **1** round

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

## Quick answers about Firefly Bio

### Who invested in Firefly Bio?

Firefly Bio's investors include Versant Ventures and Eli Lilly.

### How much has Firefly Bio raised?

Firefly Bio has raised $94M across 1 round since 2024.

### When did Firefly Bio last raise?

Firefly Bio's most recent round was a Series A of $94M in Feb 2024.

### What was Firefly Bio's biggest round?

Its most recent round, $94M in Feb 2024, is also its largest on record.

### Who backed Firefly Bio first?

Firefly Bio's first round on record, in Feb 2024, was backed by Versant Ventures and Eli Lilly.

### What stage is Firefly Bio at?

Firefly Bio's latest named round is a Series A, in Feb 2024.

### Where is Firefly Bio based?

Firefly Bio is based in the United States.

## Companies like Firefly 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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