Theodosian is a UK cybersecurity startup building a “second-layer” defence that embeds encryption and granular, per-file permissions directly into documents. Its platform attaches a persistent data-protection layer that travels with each file, performing 20–30 compliance-aligned checks and continuously verifying access rights. The technology is designed to help organisations meet multiple regulatory frameworks, including upcoming UK Defence Cyber Certification (DCC) and US Cybersecurity Maturity Model Certification (CMMC) standards. Founded by practitioners with more than a decade of experience in defence, intelligence, banking and healthcare, Theodosian aims to ensure sensitive data remains protected regardless of where it is stored or shared. Recent funding is earmarked to complete version 1 of the product and begin commercial scaling. No operating metrics such as revenue or user numbers were disclosed in the article.

Total raised

$1M

Funding rounds

1

Latest round

Seed

Latest activity

Oct 2025