Sandgrain
4 known investors
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SandGrain develops CyberRock, a post-quantum-resilient authentication platform designed for aerospace and defense applications in Europe and NATO member states.
Founders & leadership

Investors · 4
How we know: the company's own site · funding news · sandgrain.com · the VCSheet dataset · Not right? Tell us
How we know: the company's own site · funding news · the VCSheet dataset · Not right? Tell us
How we know: the company's own site · funding news · Not right? Tell us
How we know: BOM's portfolio page · funding news · Not right? Tell us
Funding
SEC filings, press & company announcements- Undisclosed amountSeries ADec 2025Source ↗
- Undisclosed amountextended seed fundingMar 2024 · 2 sourcesSource ↗
- Undisclosed amountseed investment roundApr 2023Source ↗
Source: company announcements and press reports — follow each round's link for the claim.
In the news
Frequently asked questions
- What does Sandgrain do?
- SandGrain develops CyberRock, a post-quantum-resilient authentication platform designed for aerospace and defense applications in Europe and NATO member states.
- Who founded Sandgrain?
- Sandgrain was founded by Jeroen Doumen.
- Who are Sandgrain's investors?
- Sandgrain's investors include DeepTechXL, Innovation Industries, Invest-NL, BOM.




