United Kingdom · 
Who invested in ProtonDx?
ProtonDx's investors include Innovate UK, Tim Draper and True Capital Management.
202320242025
$3.4MRound$1.6MRound$3.7MVenture$1.0MSeed
United Kingdom · Seed startup
Who invested in ProtonDx
Funding summaryUpdated 26 Oct 2026
$9.7Mraised across 4 rounds since 2023, from 5 sources
$3.4MRound$1.6MRound$3.7MVenture$1.0MSeed
- Latest round
- Seed, $1.0MDec 2025
- Biggest round
- $3.7MVenture · Nov 2023
- Investors
- 3
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Round, $3.4M Jan 2023
- Biggest round
- $3.7M Venture · Nov 2023
- Usual gap between rounds
- 7 months the median of 3
The rounds
- Dec 2025
- Nov 2023Venture$3.7M2 new
Shares issued, filed with Companies House (SH01); no report of this raise yet and 1 other
- Aug 2023Round$1.6M
No investor was named in the report.
Shares issued, filed with Companies House (SH01); no report of this raise yet
- Jan 2023Round$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$2.5MUK share allotment
- Nov 2023$3.7MUK share allotment
- Aug 2023$1.6MUK share allotment
- Jan 2023$3.1MUK share allotment
- Jan 2023$248KUK 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.
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Quick answers about ProtonDx
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.
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