Join Capital Targets €235M for Fund III to Back Europe’s Defense Tech and Dual-Use Deep Tech Leaders
TL;DR
Join Capital has secured a €50 million commitment from the European Investment Fund — anchored by the InvestEU Defence Equity Facility — as the first major institutional close for its €235 million Fund III. The Berlin-based firm, which operates across London and Milan as well, is explicitly building a pan-European VC franchise around the intersection of defense technology, dual-use deep tech, and strategic autonomy. With NATO Innovation Fund, KfW Capital, and Italy's Cassa Depositi e Prestiti already on board as LPs, Fund III's capital base reads like a who's-who of European institutional defense investors.
Key Takeaways
EIF's InvestEU Defence Equity Facility is becoming a serious force multiplier. This is not the first time the EIF has used its new defence mandate to anchor a European VC fund — it is part of a deliberate European strategy to channel institutional capital into defense and dual-use technology. When the EIF puts €50M into Join Capital's Fund III specifically through the Defence Equity Facility, it is signaling that Join Capital is considered a tier-one European partner in this category. That has downstream effects on LP recruitment and deal flow credibility.
The LP syndicate is strategically composed, not just financially motivated. Join Capital's Fund III LPs include NATO Innovation Fund, KfW Capital, Cassa Depositi e Prestiti, and Isomer Capital. This is a coalition of LPs with policy and strategic objectives aligned with Join Capital's investment thesis — which means the firm can source deal flow through government and institutional channels that purely commercial VCs cannot access.
Thirty-six portfolio companies and five exits is a meaningful track record. At Fund III, Join Capital is not making its first argument for a defense and dual-use thesis. It is scaling one that has already produced exits and a substantial active portfolio. The companies named publicly — Optics11, Quadsat, Kreios Space, Quantum Optics Jena, and 2D Photonics — span five European countries, evidencing a genuinely pan-European franchise.
Geopolitics is creating a structural tailwind that did not exist three years ago. European defense spending is at multi-decade highs and rising. The combination of NATO member commitments, the Ukraine conflict, and the EU's push for strategic technology autonomy has created a policy environment where defense tech startups can now access public procurement, EU grants, and institutional VC simultaneously.
Why This Fund Matters
European defense technology VC is not a new category — but it is a newly serious one. For most of the past two decades, defense and dual-use technology sat in an awkward gap for European VC: too sensitive for generalist investors, too commercial for pure government programs, and too early for defense primes who preferred to acquire rather than invest. Join Capital identified this gap early and built a franchise around it, developing the LP relationships, deal flow infrastructure, and technical expertise needed to operate credibly in a sector that punishes generalists.
Fund III's €235 million target represents a substantial scaling of that franchise. The EIF commitment through the InvestEU Defence Equity Facility is the most important validation signal: the EIF does not use its defence mandate lightly, and an anchor commitment of this size is an implicit endorsement of Join Capital's approach to European defense-tech investing. When you layer in NATO Innovation Fund, KfW Capital, and CDP, you are looking at a fund that has assembled a coalition of LPs with aligned strategic interests — not just financial ones.
The portfolio geography is telling. Optics11 (Netherlands), Quadsat (Denmark), Kreios Space (Spain), Quantum Optics Jena (Germany), and 2D Photonics (Italy) span five European countries. That is evidence of a genuine pan-European deal flow network that most Berlin-based VCs do not have. Offices in London and Milan in addition to Berlin give Join Capital institutional relationships across three of Europe's four largest economies — critical in a category where government procurement decisions are as important to portfolio company outcomes as commercial revenue.
The timing could not be better. European defense spending is at historic highs and the political will to fund defense-adjacent technology at the venture stage — through mechanisms like the EIF Defence Equity Facility — is translating into a capital environment that simply did not exist in 2020. Join Capital is raising Fund III into a tailwind, not a headwind.
The Team
Jan Borgstädt is Join Capital's Founding Partner and the architect of the firm's defense and dual-use thesis. Borgstädt has spent more than a decade building Join Capital's position as a pan-European investor in technologies that strengthen strategic autonomy — before that thesis became commercially fashionable. The firm's three-office structure reflects Borgstädt's belief that defense-tech investing in Europe requires genuine local presence and government relationships in multiple national markets, not just a headquarters and a network of advisors. The 36-company portfolio and 5 exits validate that the strategy is producing investment outcomes as well as policy impact.
Early Portfolio
Join Capital's portfolio of 36 companies includes several publicly known names illustrating the firm's cross-sector approach. Optics11 (Netherlands) develops fiber-optic sensing systems for both industrial and defense applications. Quadsat (Denmark) builds drone-based antenna testing systems for satellite communications. Kreios Space (Spain) develops satellite propulsion technology. Quantum Optics Jena (Germany) works on quantum communication and sensing systems. 2D Photonics (Italy) develops photonic integrated circuits with dual-use applications across communications, sensing, and computing. The portfolio spans five countries and multiple defense-relevant technology domains, with 5 exits to date.
What This Means for Founders
If you are building a company in defense, dual-use deep tech, security, or space infrastructure in Europe, Join Capital should be on your shortlist. The firm's LP network gives portfolio companies unusually direct access to government procurement pathways, NATO programs, and national development bank networks — advantages that are simply not available from generalist European VCs. The fact that EIF, NATO Innovation Fund, and KfW are all LPs means Join Capital can open institutional doors that most investors cannot.
Founders working on technologies with both civilian and military applications — photonics, quantum sensing, satellite systems, advanced propulsion, autonomous systems — are specifically in scope. Join Capital's willingness to engage with the complexity of dual-use regulations, export controls, and government procurement is a direct product of its decade of experience in this space, and it is a genuine differentiator for founders who need an investor that understands the sector rather than just the financials.
Fund Momentum Take
Join Capital Fund III is arriving at exactly the right moment in European defense-tech history. The macro environment — record defense budgets, EU strategic autonomy ambitions, active EIF and NATO mandates to fund dual-use innovation — is creating the best institutional tailwind this sector has seen in decades. Join Capital has spent years building the relationships, expertise, and track record needed to take full advantage of that moment, and Fund III is the vehicle through which they will do it.
The LP syndicate is the most impressive signal. EIF through InvestEU Defence Equity Facility, NATO Innovation Fund, KfW Capital, and CDP are not passive financial investors — they are strategic institutions with active interests in European defense-tech outcomes. That alignment between LP mandate and portfolio thesis is unusually strong, and it suggests Join Capital will have access to deal flow, co-investment, and portfolio company support mechanisms that purely commercially-oriented funds will not.
The risk is sector competition. Defense-tech investing in Europe is attracting more capital than ever, which means entry valuations in the category are moving. Join Capital's advantage is its decade of track record and its LP network; newer entrants to European defense VC will struggle to compete on either dimension. If the firm maintains discipline on entry valuation and focuses on genuine hard-tech companies rather than defense-narrative software businesses, Fund III should be a strong vintage.
Frequently Asked Questions
What is Join Capital's investment thesis for Fund III?
Join Capital invests in early-stage deep tech companies building technologies that strengthen European strategic autonomy and resilience — specifically in defense, dual-use, security, and space sectors. The fund operates from Berlin, London, and Milan and targets pan-European founders across these categories.
What is the InvestEU Defence Equity Facility?
The InvestEU Defence Equity Facility is a European Investment Fund program that channels institutional capital into venture and growth-stage investments in defense and dual-use technology companies, part of the EU's broader effort to strengthen European defense industrial capacity through private capital.
Who are Join Capital Fund III's LPs?
Confirmed LPs include the European Investment Fund (via InvestEU Defence Equity Facility), NATO Innovation Fund, KfW Capital (Germany), Cassa Depositi e Prestiti (Italy), and Isomer Capital, along with fund-of-funds and family offices. The LP base reflects a deliberate assembly of institutions with aligned strategic interests in European defense and dual-use technology.
How large is Join Capital's existing portfolio?
Join Capital has backed 36 companies across its previous funds, with 5 exits to date. Portfolio companies include Optics11, Quadsat, Kreios Space, Quantum Optics Jena, and 2D Photonics, spanning five European countries.
What stage does Join Capital invest at?
Join Capital focuses on early-stage deep tech companies where the technology risk is highest and the firm's domain expertise and institutional network provide the most value to founders navigating defense sector complexity.
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