National Security Strategic Investment Fund
London, United KingdomFounded 2018
The National Security Strategic Investment Fund (NSSIF) is the UK Government's deep tech venture capital fund for National Security and Defence. It backs pioneering start-ups developing dual-use technologies with strategic relevance, as well as investing indirectly in venture capital funds.
37% of their portfolio is in Defense & Space. Deal activity decreased year-over-year (2 deals in the last 12 months vs 3 prior). Average disclosed round size is $74.0M (across 8 rounds with reported amounts).
Portfolio
14
Fund Size
$253M
Top Stage
Series A
Last 12 Mo
2
Team
HL
Hugh Liddell
Senior Investment Partner
LJ
Laura Jaques
Acting Head of Investments
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
19 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Mutable Tactics | Pre-Seed | $2.1M | Mar 2026 |
 Optalysys | Series A | — | Jan 2026 |
 Optera | Unknown | — | Jan 2026 |
 Space Forge | Series A | — | May 2025 |
 Tekever | Growth | — | May 2025 |
| Tekever | Series B | — | Nov 2024 |
 Riverlane | Series C | $75M | Aug 2024 |
 Greenjets | Series A | $40M | Jan 2024 |
 Quantum Motion | Series C | $50.5M | Feb 2023 |
| Riverlane | Series B | — | Jan 2023 |
| Quantum Motion | Series B | $42M | Jan 2023 |
| Quantum Motion | Series A | — | May 2020 |
 Open Cosmos | Series A | $7M | Apr 2018 |
 Oxford Space Systems | Growth | — | — |
| Riverlane | Series A | — | — |
| PPhotonic Inc. | Unknown | $200M | — |
 Sofant Technologies Ltd | Unknown | — | — |
| DDelta g Ltd | Seed | — | — |
| KKraken Technology Group | Series B | $175M | — |
Top Co-Investors
British Business Bank5 shared
Amadeus Capital Partners4 shared
Octopus Ventures3 shared
Parkwalk Advisors3 shared
British Patient Capital3 shared
GG13 shared
INKEF Capital3 shared
Cambridge Innovation Capital3 shared
AltaIR Capital3 shared
Innovation Nest3 shared
Oxford Science Enterprises2 shared
IP Group plc2 shared
Porsche Automobil Holding SE2 shared
Porsche AG2 shared
ETF Partners2 shared
Crescent Cove2 shared
Baillie Gifford2 shared
Entrepreneurs First2 shared
Seraphim Space2 shared
Last updated: 7 October 2026