Sovereign28%
of UK central government technology is classed as legacy, up from 26% a year earlier.
Investors
Invest in replacing the software organisations cannot switch off.
Retailers, manufacturers, hospitals, government departments and banks still run on software written decades ago, and replacing it is risky: when TSB’s 2018 switch to a new platform failed on the day, it ended in a £48.65 million fine. Our flagship product, Sovereign, rebuilds these systems in modern code and proves the new one gives the same results before anyone switches over.
The problem
The oldest software runs the most important work.
Everyone who owns these systems knows they must replace them. Few dare, because a failed switch lands on customers, regulators and the front page.
3 to 4×
what it costs to maintain a legacy system compared with a modern one, as HMRC’s contracts for its COBOL systems show.
£48.65m
in fines after TSB’s 2018 switch to a new banking platform failed on the day.
Sources: UK Government, State of digital government review (January 2025); FCA and Bank of England (2022).
Why Syntaxe
Sovereign is built, and it works.
You want evidence, not promises. Every claim we make comes with evidence you can check.
Proven on real code
Eight languages, proven
Sovereign rebuilds and proves COBOL, PL/I, JCL, Fortran, MUMPS, REXX, Perl and ColdFusion, each checked against its own compiler or interpreter.
Built for the hardest buyers
Runs inside the customer’s network
It installs on the customer’s own machines and needs no internet connection, so government, defence and regulated industries can use it.
Checkable
Evidence the customer can re-run
Every result comes with the inputs, both outputs and the source lines behind it, so the customer’s team can check it without us.
Recognised
Member of NVIDIA Inception
Syntaxe is part of NVIDIA Inception, NVIDIA’s programme for AI companies.
What we have built
Four products, one team.
Sovereign is our flagship. The same team builds three more products, in cybersecurity and scientific research.
Sovereign
Legacy system modernisation
Rebuilds old software in modern code and proves the new system gives the same results.
Kern
AI agent security
Shows what an AI agent can reach and blocks it from sending your data where it should not go.
Anneal
Vulnerability management
Finds the security weaknesses an attacker could actually use, and checks each fix worked.
Codec
Computational biology
An early-stage tool for testing if a cell’s history predicts what it will become.
How to invest
Three steps.
- 1
Email us.
Tell us about your fund and the stage you invest at.
- 2
Get the investor materials.
We send the deck, the product evidence and our plan.
- 3
Ask, then decide.
Ask us anything by email. You decide with the full picture.
What you are backing
A safer way to replace the software that cannot fail.
- A product that is already built and tested on real code.
- A problem every organisation with old critical software has to solve, and that gets more expensive every year it waits.
- Evidence at every step, so buyers can say yes without betting their reputation.
- A team that has built four products.
Email us for our investor materials.
We reply with the deck, the product evidence and answers to your questions.