Institutional Capital Pours Into Defence as ESG Barriers Fall and NATO Locks In 5% Spending Target

Institutional investors are accelerating defence sector allocations at a pace unseen since the Cold War, marking a structural portfolio shift driven by NATO’s new 5% GDP spending commitment by 2035 and the collapse of ESG-driven exclusions that previously constrained capital flows.

The reallocation reflects a fundamental reassessment of risk. NATO committed in June 2025 to raising defence spending to 5% of GDP annually by 2035, more than doubling the legacy 2% baseline. All 32 member states met or exceeded that 2% target in 2025 for the first time, pushing combined NATO defence expenditure past $1.4 trillion. European NATO allies and Canada alone increased defence spending by 20% year-over-year in real terms, per FlightGlobal reporting on the NATO Secretary General’s 2025 annual report.

The United States Congress approved $900.6 billion for defence spending in 2026, according to U.S. News & World Report. Global defence budgets are forecast to grow approximately 5% in 2026, with total spending potentially surpassing $3.6 trillion by 2030, data from Global X ETFs shows. This creates revenue visibility extending 5-10 years — a duration typically reserved for subscription software models, not industrial sectors.

ESG Frameworks Recalibrate as Fiduciary Duty Reframes Defence

The institutional flow into defence equities was long constrained by environmental, social, and governance exclusions that classified weapons manufacturers as sin stocks. That barrier is dissolving. Many institutional investors are now reclassifying defence as a social good under fiduciary duty frameworks, reducing ESG hesitancy, according to Business Economy. The pivot reflects a view that national security infrastructure — particularly in democracies facing authoritarian aggression — constitutes a strategic necessity rather than an ethical liability.

Capital flows confirm the shift. The Invesco Aerospace & Defense ETF held $8.2 billion in assets as of April 2026, while the SPDR S&P Aerospace & Defense ETF held $5.9 billion, per Motley Fool data. European defence stocks surged 259% between February 2022 and February 2025, with Rheinmetall alone jumping more than 170% since the start of 2025, Homaio reported.

Defence-Tech Subsector Drives Margin Expansion

The institutional thesis extends beyond geopolitical risk premiums. Defence Tech operating margins are forecast to have expanded 230+ basis points in 2025, with an additional 120 basis points expected in 2026, data from Global X ETFs shows. The margin expansion reflects integration of artificial intelligence, autonomous systems, and software platforms that replace legacy hardware models — paralleling the economics that drove the 2010s technology rally.

The counter-unmanned aircraft systems market alone is projected to grow from $6.64 billion in 2025 to $20.31 billion by 2030, representing a 25.1% compound annual growth rate, according to MarketsandMarkets research. AI-enabled sensor fusion and directed-energy systems are attracting capital previously allocated to commercial technology. AeroVironment completed a $4.1 billion all-stock acquisition of BlueHalo on 1 May 2025, expanding into directed-energy, space, and electronic warfare capabilities.

Geopolitical Risk Premium Creates Sustained Demand Visibility

The Russia-Ukraine war affected 81.4% of global defence company stocks, with UK companies showing the highest sensitivity to geopolitical risk events, research published in PLOS One found. Lockheed Martin’s backlog surpassed $170 billion in the third quarter of 2025, reflecting multi-year NATO and US modernisation visibility, per Gainify analysis.

Global defence spending reached $2.7 trillion in 2024, up 9.4% in real terms from 2023 — the steepest year-over-year rise since the end of the Cold War, BlackRock noted. The growth trajectory is no longer cyclical. Institutional investors are treating defence capex as a permanent baseline, enabled by locked-in legislative commitments and multi-year procurement contracts that insulate revenue from short-term political shifts.

Portfolio Construction Shifts Away From Tech Concentration

The capital reallocation from growth technology into defence equities reflects both valuation discipline and fundamental recognition that government-backed revenue streams offer downside protection in an environment of macro uncertainty. Defence companies now trade at multiples historically reserved for software-as-a-service businesses, enabled by predictable cash flows and margin expansion comparable to commercial technology platforms.

Matt Gertken, chief geopolitical strategist at BCA Research, told Bloomberg: “A ceasefire will create a setback — and a buying opportunity — for defense stocks.” The comment underscores institutional conviction that demand drivers extend beyond active conflict. NATO’s 5% commitment, US budget trajectories, and defence-tech margin profiles create a structural allocation case independent of near-term geopolitical headlines.

What to Watch

Monitor quarterly inflows into defence-focused ETFs as a leading indicator of institutional conviction. NATO member compliance with the 5% trajectory through 2027-2028 will validate the durability of budget commitments versus political rhetoric. Defence-tech earnings calls will reveal whether AI/autonomy integration translates to sustained margin expansion or faces integration costs that compress near-term profitability. Any ceasefire agreements in Ukraine or Middle East de-escalation could trigger short-term profit-taking, creating entry points for long-duration allocators betting on structural rather than cyclical demand. ESG policy shifts at major pension funds and sovereign wealth funds will signal whether the fiduciary reclassification of defence proves durable or faces renewed exclusionary pressure from stakeholder advocacy groups.