# ProtonDx funding: rounds and investors

> ProtonDx has raised $9.7M across 4 rounds since 2023. Investors include Innovate UK, Tim Draper and True Capital Management. Every round with its source.

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

United Kingdom · [Seed startup](https://millionrounds.com/companies)

# Who invested in *ProtonDx*

4 rounds we have observed, with the 3 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.

AI Biotech

Raised 11 months ago

Funding summary Updated 26 Oct 2026

**$9.7M** raised across 4 rounds since 2023, from 5 sources

**$3.4M** Round **$1.6M** Round **$3.7M** Venture **$1.0M** Seed

- **Latest round:** Seed, $1.0M Dec 2025
- **Biggest round:** $3.7M Venture · Nov 2023
- **Investors:** 3

See who backed them

## The funding story

Each circle is a round, placed by date and sized by amount. The line above is the running total.

2023 2024 2025

**$3.4M** Round

**$1.6M** Round

**$3.7M** Venture

**$1.0M** Seed

- **First round:** Round, $3.4M
- **Biggest round:** $3.7M
- **Usual gap between rounds:** 7 months

## The rounds

- **Dec 2025** Seed **$1.0M** *1 new* [Innovate UK](https://millionrounds.com/fund/innovate-uk) Source recorded
- **Nov 2023** Venture **$3.7M** *2 new* [Tim Draper](https://millionrounds.com/fund/tim-draper) [True Capital Management](https://millionrounds.com/fund/true-capital-management) Shares issued, filed with Companies House (SH01); no report of this raise yet and 1 other
- **Aug 2023** Round **$1.6M** No investor was named in the report. Shares issued, filed with Companies House (SH01); no report of this raise yet
- **Jan 2023** Round **$3.4M** No investor was named in the report. Shares issued, filed with Companies House (SH01); no report of this raise yet

## Funding filed with regulators

ProtonDx filed 5 raises, $11M in all. Filings say how much was sold and to how many investors; they never name the investors.

- Feb 2026 **$2.5M** UK share allotment
- Nov 2023 **$3.7M** UK share allotment
- Aug 2023 **$1.6M** UK share allotment
- Jan 2023 **$3.1M** UK share allotment
- Jan 2023 **$248K** UK share allotment

## Who was in which round

The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.

**Round** 2023 **Round** 2023 **Venture** 2023 **Seed** 2025 [Innovate UK](https://millionrounds.com/fund/innovate-uk) [Tim Draper](https://millionrounds.com/fund/tim-draper) [True Capital Management](https://millionrounds.com/fund/true-capital-management)

## Everyone who backed them

[Innovate UK](https://millionrounds.com/fund/innovate-uk) VC firm **1** round

[Tim Draper](https://millionrounds.com/fund/tim-draper) VC firm **1** round

[True Capital Management](https://millionrounds.com/fund/true-capital-management) Family office **1** round

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

## Quick answers about ProtonDx

### Who invested in ProtonDx?

ProtonDx's investors include Innovate UK, Tim Draper and True Capital Management.

### How much has ProtonDx raised?

ProtonDx has raised $9.7M across 4 rounds since 2023.

### When did ProtonDx last raise?

ProtonDx's most recent round was a Seed of $1.0M in Dec 2025.

### What was ProtonDx's biggest round?

ProtonDx's largest round on record is $3.7M (Venture), in Nov 2023.

### Who backed ProtonDx first?

ProtonDx's first round on record, in Nov 2023, was backed by Tim Draper and True Capital Management.

### What stage is ProtonDx at?

ProtonDx's latest named round is a Seed, in Dec 2025.

### Where is ProtonDx based?

ProtonDx is based in the United Kingdom.

## Companies like ProtonDx

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

[**Cognitive Credit** $64M · Oct 2026](https://millionrounds.com/company/cognitive-credit)[**Marrow** $2.0M · Oct 2026](https://millionrounds.com/company/marrow)[**Opply** $23M · Oct 2026](https://millionrounds.com/company/opply)[**HydRegen** $12M · Oct 2026](https://millionrounds.com/company/hydregen)[**XRlabs** $8.4M · Oct 2026](https://millionrounds.com/company/xrlabs)[**Salience Labs** $169M · Oct 2026](https://millionrounds.com/company/salience-labs)

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