Capital followed threat in the first half of 2025. Governments opened treasuries in response to an unprecedented rise in military expenditure, and private capital responded by repricing a cluster of defence-focused startups and by crowding into dual-use deep tech. The result is a market that looks less like a steady reversion to prime-contractor dominance and more like a bifurcated ecosystem: well-capitalized platform neo-primes on one side and a crowded field of specialist scaleups on the other.

The macro baseline matters. Independent estimates put world military spending in 2024 at roughly $2.7 trillion, the largest year-on-year jump in decades and the tenth consecutive annual increase. That spending surge was concentrated in Europe and the Middle East, with the United States, China and Russia still accounting for the largest absolute shares. Those budget increases created a wide and persistent procurement tail that private investors were quick to price into valuations.

On the public markets and in corporate boardrooms, that tail has produced outsized sector performance. European defence equities outperformed regional indices in early 2025 as orders and guidance season confirmed backlog expansion and ammunition and munitions programs moved from planning to paid production. At the same time, an acceleration of M&A and private equity interest into aerospace and defence supply chains reflected both strategic onshoring and investors chasing recurring aftermarket cash flows.

Private capital has been even more dramatic. Venture and strategic rounds flowed into autonomy, counter-UAS, resilient communications and manufacturing automation. Large strategic rounds re-priced market leaders: one high-profile autonomy platform secured a multibillion dollar extension that more than doubled its private valuation in mid-2025. At the same time, European deep-tech and defence-resilience funding reached record levels, helped by newly active public initiatives and by funds explicitly targeting defence and resilience. The combined effect is materially more risk capital available to scale manufacturing capacity and to underwrite large, programmatic R&D.

What changed in investors’ calculus is important. Whereas before 2022 investors feared long procurement timelines and narrow government buyer sets, they now see repeatable productized lines that can be sold to multiple allied customers and sometimes under commercially structured models. That structural change increased both willing buyers and willing sellers among institutional allocators. Some strategic investors also stepped in as anchor customers in late-stage rounds to accelerate international market access and to secure supply relationships. The effect has been to shorten the perceived ‘‘valley of death’’ for certain categories of defence scaleups.

But the boom has limits and pathologies. First, valuations are stretched in several subsectors. Where revenues are still early and integration risk remains high, late-stage pricing now assumes smooth transitions into production, reliable logistics and few regulatory surprises. Those are strong assumptions, and when tests or operational deployments expose engineering or reliability issues, corrections can be severe. Second, the buyer set is still concentrated. Governments and a handful of large primes remain the dominant customers for high-ticket systems. Private capital cannot substitute for sustained program-of-record orders. Third, supply chain friction is real. Ammunition, specialty semiconductor and turbine supply are constrained by factory lead times, raw materials and certification bottlenecks; more money does not instantly create capacity. These risks mean the market is likely to reallocate capital aggressively in the next 12 to 24 months as program performance data and delivery records accumulate.

Case snapshots illustrate the dynamics. Anduril’s mid-2025 raise at roughly $30.5 billion valuation reflected both strong topline growth and the market discounting prime-like behaviour from a software-hardware integrator. Public reporting around that round also tied the valuation re-rate to near-term revenue expansion and contract wins. Conversely, several smaller drone and sensor startups that had strong early demonstrations faced tougher fundraising conversations once defence buyers demanded sustainable manufacturing and in-theatre support commitments. The capital is available, but at a higher bar of evidence.

Strategic implications for incumbents and investors

  • Incumbents should accelerate platform-based M&A. Legacy primes that acquire software-first integrators or that secure OEM supply relationships gain more than product lines; they buy adoption velocity and access to new pricing models. Expect more megadeals focused on software stacks, autonomy middleware and edge compute for weapons systems. Some of those deals have already begun to appear in private equity pipelines.

  • Investors should segment risk by business model. Subscription or recurring software revenue tied to deployed hardware materially reduces execution risk relative to one-off hardware sales. Where startups can demonstrate contracted recurring revenue with allied customers, their risk profile converges toward that of a systems integrator. Where revenue depends on single-country procurement, discount rates must stay higher.

  • Policymakers and procurers must square speed with sustainment. Rapid procurement of novel platforms without an industrial plan to scale ammunition, spares and maintenance creates brittle force structures. Public spending that prioritizes near-term capability without parallel investment in industrial base resilience will produce capability pockets that are expensive to sustain. SIPRI-style spending surges highlight this structural tension.

Short horizon forecasts (12 to 24 months)

  • Continued capital inflows into autonomy, counter-UAS and resilient communications, but with rising selectivity. Investors will prefer winners with production footprints and anchor contracts.

  • Accelerating consolidation. Expect more late-stage acquisitions by primes and private equity buyers as both seek to secure critical components and to internalize higher-margin software. This will mean fewer independent pure-play hardware vendors at scale.

  • A market correction window is possible if operational trials reveal systemic integration problems. When procurement programs move from prototype to fielded capability, performance issues will be penalized quickly in valuations. Buyers will demand stronger evidence of reliability and sustainment.

Conclusion

The post-2025 boom is not a single phenomenon but a rebalancing: more sovereign defence spending plus easier private capital access equals faster growth in selected categories and earlier market discipline for others. For investors that can combine domain expertise with manufacturing patience, the market offers attractive returns. For policymakers, the choice is to convert this inflow of private capital into durable, sovereign-ready industrial capacity rather than a short burst of capability that leaves logistics and sustainment gaps. The coming 18 months will answer whether this cycle matures into a sustainable national security innovation economy or collapses into a familiar boom-and-bust pattern seen in other defence-adjacent industries.