Defence Is Booming. Here's Who's Actually Cashing In.

The world's most reliable growth industry right now isn't AI, isn't semiconductors, and isn't pharmaceuticals. It's war—or more precisely, the infrastructure built to wage it. Global military spending crossed $2.4 trillion in 2024, the highest level since the Cold War ended. And the money is flowing somewhere entirely new.

The Old Order Is Cracking

For decades, defence was a closed shop. Lockheed Martin, Raytheon, BAE Systems—a handful of primes dominated the landscape, running decade-long procurement cycles with governments as their only real customers. It was slow, bureaucratic, and extraordinarily profitable for those already inside the gate.

Ukraine broke that model open. A $400 commercial drone took out a $3 million armoured vehicle. Starlink—a civilian broadband service—became the backbone of battlefield communications. The lesson absorbed by every defence ministry watching: legacy procurement is too slow, and the most lethal technology is now being built in Palo Alto, not Huntsville.

The institutional response has been swift. The US Department of Defense expanded direct contracting with non-traditional vendors. The UK's Defence and Security Accelerator (DASA) has funnelled hundreds of millions into startups. The EU announced its ReARM Europe plan—€150 billion in defence investment between 2025 and 2027—the largest peacetime military spending commitment in the bloc's history.

Follow the Money

Three sectors are capturing a disproportionate share of this capital.

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The first is autonomous systems. Anduril Industries, founded in 2017, reached a $14 billion valuation by 2024. Shield AI is not far behind. What they sell isn't hardware in the traditional sense—it's software-defined decision-making layered onto physical platforms. The recurring revenue logic mirrors enterprise SaaS more than it does conventional defence contracting.

The second is space and surveillance infrastructure. Commercial satellite operators Planet Labs and Maxar Technologies are now primary intelligence suppliers to Western governments. The line between civilian remote sensing and military ISR (intelligence, surveillance, reconnaissance) has effectively dissolved.

The third is data and AI. Palantir Technologies has positioned itself as the operating system of the modern military. Its stock rose more than 300% in 2024, driven by expanding government contracts across the US, UK, and NATO allies. Investors who dismissed it as a niche government contractor three years ago have been forced to reconsider.

The Uncomfortable Arithmetic

The investment thesis for defence looks compelling on a spreadsheet. Geopolitical tension is structurally elevated—NATO members are under treaty pressure to hit 2% of GDP in defence spending, and several are now targeting 3%. Demand is durable. Margins on software-intensive systems are high. Customer concentration risk is low when the customer is a sovereign government.

But the risks are less visible than the returns.

Speed creates verification gaps. Legacy procurement was slow partly for good reason—safety validation and reliability testing for systems that operate in lethal environments. Autonomous weapons updated via software patches introduce failure modes that no procurement officer fully understands yet. When an AI-driven system misidentifies a target, the liability chain is genuinely unclear.

Civilian infrastructure dependency is a strategic vulnerability. Starlink's brief service restrictions in Ukraine in 2022 demonstrated what happens when a private company controls a critical military asset. Elon Musk's decisions became, briefly, a factor in battlefield outcomes. That's a governance problem that no defence ministry has cleanly resolved.

And for investors, the volatility profile is asymmetric in ways that aren't always priced in. Defence ETFs surged 15–20% in the weeks following the October 2023 Gaza outbreak, then gave back significant gains as the narrative shifted. These are instruments that rise on human catastrophe and fall on diplomacy—a dynamic that institutional allocators are increasingly being asked to justify to their beneficiaries.