# Proton Bio funding: rounds and investors

> Proton Bio has raised $76M across 1 round since 2022. Investors include Hill House Capital and China Merchants Capital. Every round with its source.

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

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

# Who invested in *Proton 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.

Pharma

Funding summary Updated 26 Oct 2026

**$76M** raised across 1 round since 2022, from 1 source

- **Latest round:** Series B, $76M Aug 2022
- **Investors:** 2

See who backed them

## The rounds

- **Aug 2022** Series B **$76M** [Hill House Capital](https://millionrounds.com/fund/hill-house-capital) [China Merchants Capital](https://millionrounds.com/fund/china-merchants-capital) Source recorded

## Everyone who backed them

[Hill House Capital](https://millionrounds.com/fund/hill-house-capital) Family office **1** round

[China Merchants Capital](https://millionrounds.com/fund/china-merchants-capital) VC firm **1** round

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

## Quick answers about Proton Bio

### Who invested in Proton Bio?

Proton Bio's investors include Hill House Capital and China Merchants Capital.

### How much has Proton Bio raised?

Proton Bio has raised $76M across 1 round since 2022.

### When did Proton Bio last raise?

Proton Bio's most recent round was a Series B of $76M in Aug 2022.

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

Its most recent round, $76M in Aug 2022, is also its largest on record.

### Who backed Proton Bio first?

Proton Bio's first round on record, in Aug 2022, was backed by Hill House Capital and China Merchants Capital.

### What stage is Proton Bio at?

Proton Bio's latest named round is a Series B, in Aug 2022.

## Companies like Proton Bio

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

[**Cheiron** $8.0M · Jul 2026](https://millionrounds.com/company/cheiron)[**Celloid** $6.1M · Mar 2026](https://millionrounds.com/company/celloid)[**CSR Biotech** Mar 2026](https://millionrounds.com/company/csr-biotech)[**Validfor** $1.2M · Feb 2026](https://millionrounds.com/company/validfor)[**Huixin Bio** $14M · Feb 2026](https://millionrounds.com/company/huixin-bio)[**Alioth** $14M · Jan 2026](https://millionrounds.com/company/alioth)

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