Osney Capital Closes £60M Debut, the UK's First Dedicated Cyber Seed Fund
TL;DR
London-based Osney Capital has held the final close of its debut fund at a £60 million hard cap, oversubscribed against an original £50 million target, making it the UK's first venture firm dedicated exclusively to early-stage cybersecurity. The British Business Bank anchored the vehicle with roughly £36 million, with Imperial College London's endowment and Planet First Partners joining at final close. The fund writes pre-seed and seed cheques of £250k to £2.5 million and has already deployed into seven companies. In a market where generalist seed funds increasingly wave a "cyber thesis" slide, Osney is making the harder bet: that sector specialisation, not breadth, is the edge in security.
Key Takeaways
The UK finally has a pure-play cyber seed fund. Britain has world-class security research, GCHQ and NCSC talent spillover, and a steady stream of academic spinouts, yet founders have long had to pitch generalists who treat cyber as one vertical among ten. Osney removes that translation layer by underwriting only security companies.
The British Business Bank wrote the cheque that mattered. A roughly £36 million cornerstone from the state-backed BBB is more than half the fund and a strong signal that cyber is now treated as strategic national infrastructure, not a niche. It also de-risks the LP base for a first-time manager, which is usually the hardest part of a debut raise.
Specialisation is the thesis, and the moat. Osney's pitch is that deep knowledge of buyers, threat models, and procurement cycles lets it pick and help better than a generalist. In security, where the customer is a CISO with a specific budget line and a long sales cycle, that domain fluency is genuinely differentiating.
National-security accreditation is a real edge. The fund is accredited under the National Security Strategic Investment Fund, which gives it proximity to government-adjacent demand and sensitive-technology deal flow that most VCs simply cannot access.
Fund Overview
Fund Name: Osney Capital Fund I (debut)
Fund Size: £60 million (approx. €69M / $76M), oversubscribed against a £50M target
Stage: Pre-seed and seed; typically rounds under £5M
Check Size: £250,000 to £2.5 million
Geography: United Kingdom
Focus: Cybersecurity, exclusively
Key LPs: British Business Bank (cornerstone, ~£36M), Imperial College London Endowment, Planet First Partners, plus former cyber founders and senior national-security leaders; accredited by the National Security Strategic Investment Fund (NSSIF)
Why This Fund Matters
The UK has a structural paradox in cybersecurity. It produces some of the strongest security research and operational talent in the world, channelled through institutions like GCHQ, NCSC, and a dense academic base, but it has historically lacked patient, specialist capital to convert that talent into companies. Founders coming out of national security or infosec backgrounds have had to pitch generalist seed funds that may see only a handful of security deals a year. Osney's bet is that this gap is an opportunity, and that a fund built entirely around the sector can compound an informational and network advantage that generalists structurally cannot.
The timing is hard to argue with. Cyber budgets are among the most defensible line items in any enterprise, AI is simultaneously expanding the attack surface and rearming defenders, and regulation keeps ratcheting demand upward. A debut fund closing oversubscribed in a tight 2026 fundraising environment, where LPs are writing fewer and more concentrated cheques, says the thesis resonated with sophisticated allocators rather than just retail enthusiasm.
The British Business Bank's involvement reframes the story from "another seed fund" to "industrial policy." When a government-backed institution puts more than half the capital into a first-time cyber manager, it is signalling that domestic security capability is strategic, and that the state wants a homegrown pipeline rather than watching the best UK security startups get acquired early by US acquirers or funded by US VCs who pull them across the Atlantic.
For the broader European cyber ecosystem, Osney is a template. Specialist seed funds in defence, security, and dual-use are proliferating, and the ones with government cornerstones and credible operator benches are pulling ahead. Osney now has both.
The Team
Osney Capital is led by three partners. Adam Cragg, a co-founder of the firm, brings an ecosystem-building background spanning startup programmes at MIT and NYU and university commercialisation, alongside prior experience founding a venture firm. Joshua Walter, also a partner, comes from senior leadership roles inside the cybersecurity sector, with earlier experience in financial services, giving the fund operator credibility with the CISOs and security buyers its portfolio must sell to. Paul Wilkes, partner, spent over fifteen years as a financial services and regulatory lawyer, including eight years as a partner leading the corporate team at offshore firm Collas Crill, which underpins the fund's structuring and compliance rigour. The bench is rounded out by a network of former cyber founders and senior national-security figures who back the fund as LPs and advisors, an unusually concentrated source of sector pattern recognition for a debut manager.
Early Portfolio
In the period since its first close, Osney has backed seven pre-seed and seed companies, including Refute, Ossprey, Aisy, Huntbase, Overmind, Ploy, and Aviel, alongside Strand Intelligence. Cheques have ranged from £250,000 to £2.5 million, consistent with a strategy of leading or co-leading the earliest institutional round and reserving capital for follow-on. The portfolio skews toward AI-enabled detection, identity, and security operations tooling, the categories where early-stage security demand is most acute.
What This Means for Founders
If you are a UK security founder raising a pre-seed or seed round under roughly £5 million, Osney should be at the top of your list, not because it is the only cheque available, but because it is the cheque that comes with sector-native help. The value-add here is concrete: buyer introductions to CISOs, an understanding of security procurement cycles that generalists lack, and credibility with government-adjacent customers via the NSSIF accreditation. For founders who would otherwise spend half of every generalist pitch explaining the threat landscape, that shared context is worth real money.
The flip side: a specialist fund is a specialist filter. If your company is only loosely a security play, or you are based outside the UK, Osney is probably not your lead. Founders should also weigh the concentration risk of taking money from a debut fund, balanced against the upside that you will likely get more partner attention than you would from a larger, more diversified firm.
Fund Momentum Take
This is one of the more strategically coherent debut closes we have seen in Europe this year. Osney is not chasing a hot narrative with a generalist fund and a cyber tagline; it has built the entire firm around a single, defensible thesis and secured the one LP, the British Business Bank, whose participation both funds the vehicle and validates the mission. Oversubscription in a difficult 2026 LP market is the tell that this resonated with people who allocate for a living.
The risk is the mirror image of the strength. Pure specialisation means Osney lives or dies on UK cyber deal flow and exit dynamics. If the best UK security companies continue to sell early to US strategics, the fund may generate solid but not spectacular returns, and a £60 million fund needs at least one genuine breakout to return capital with venture-grade multiples. The heavy reliance on a government-backed cornerstone is also double-edged: it de-risks the raise but can invite mandate creep and reporting overhead that pure commercial LPs would not impose.
Our bet: Osney is well-positioned to become the default first institutional cheque for UK cyber, and its real test will be Fund II, when it has to show DPI, not just a clean thesis. We would watch whether it can hold its discipline and stay UK-and-cyber-only as it scales, because the temptation to drift into broader "national security" and dual-use, where the cheques are bigger and the competition fiercer, will be strong.
Frequently Asked Questions
How big is Osney Capital's debut fund?
£60 million, closed at its hard cap and oversubscribed against an original £50 million target. That is the equivalent of roughly €69 million or $76 million.
What does Osney Capital invest in?
Exclusively early-stage UK cybersecurity companies at pre-seed and seed, typically in rounds under £5 million, with cheque sizes from £250,000 to £2.5 million.
Who are the main investors (LPs) in the fund?
The British Business Bank is the cornerstone with roughly £36 million. Imperial College London's endowment and Planet First Partners joined at final close, alongside former cyber founders and senior national-security leaders. The fund is accredited by the National Security Strategic Investment Fund.
Who runs Osney Capital?
The firm is led by partners Adam Cragg (co-founder), Joshua Walter, and Paul Wilkes, combining ecosystem-building, cybersecurity operating, and financial/legal structuring backgrounds.
Why is this fund significant for the UK?
It is the first UK venture fund dedicated solely to cybersecurity, and the British Business Bank's large cornerstone signals that domestic cyber capability is now treated as strategic national infrastructure rather than a niche vertical.
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