When most people think about defence spending, they picture tanks, ships and fighter jets. Increasingly, though, a bigger part of the story sits in software, cyber tools, autonomous systems and the data infrastructure that helps militaries make decisions faster.
That matters for investors because it changes which businesses may benefit when governments open the wallet. Instead of only watching traditional weapons manufacturers, investors are now looking at exposures such as the Global X Defence Tech ETF (ASX:DTEC) and companies like Palantir Technologies Inc. (NASDAQ:PLTR), which sits closer to the software-and-data end of the spectrum.
Some research suggests global defence spending could climb above US$3.4 trillion by 2030. If that plays out, the bigger shift may not just be the size of the spend, but where the money goes: artificial intelligence, cybersecurity, drones and digital command systems.
Why investors are paying attention
Recent conflicts and broader geopolitical tension have pushed national security back to the top of the agenda. That has helped support a long-running rise in military budgets, but the more interesting part for investors is the changing shape of procurement.
Older defence cycles were often centred on replacing physical hardware and maintaining ammunition stockpiles. That still matters. But modern defence planning increasingly leans on software, autonomous systems, real-time data analysis and resilient digital infrastructure.
In other words, the defence story is no longer just about who builds the biggest equipment. It is also about who helps militaries see faster, decide faster and operate more efficiently.
Software may be one of the quiet winners
One of the more underappreciated parts of this theme is defence software. Even if software still represents a relatively small slice of total military spending, it can have an outsized effect on operations, logistics, surveillance and coordination.
That is part of why investors keep an eye on businesses such as Palantir. Its government-facing contracts show how data platforms and AI tools are becoming more deeply embedded in defence planning and execution. Whether any one stock belongs in a portfolio is a separate question, but the broader trend is clear: defence is becoming more digital.
For investors, that can widen the opportunity set beyond traditional primes. It can include businesses involved in analytics, cyber defence, mission software, cloud infrastructure, sensors and communications systems.
Drones are changing the economics of warfare
Drones are not just a futuristic headline. They may also be changing the economics of conflict in a very practical way. Lower-cost systems can sometimes threaten or disable much more expensive equipment, which means military effectiveness is not always tied to the biggest budget.
That matters because it lowers the barrier to impact. A relatively cheap autonomous system can force a much larger investment in defence or interception. For investors, that changes how the value chain looks. It is no longer only about the company that builds the final platform. It may also be about the chipmakers, software providers, component suppliers and infrastructure businesses behind the scenes.
How an ETF can fit into the picture
For investors who want exposure to the theme without trying to pick a single winner, an ETF can be a simpler starting point. DTEC gives exposure to a basket of companies connected to defence innovation, which can help reduce single-company risk compared with buying one stock.
That does not make the theme low risk. Defence tech is still a thematic investment, and thematic investing can be volatile. Valuations can run hot, narratives can move quickly and market enthusiasm can fade just as fast as it arrives.
But if the thesis is that defence budgets are becoming more technology-heavy over time, a diversified ETF can be one way to access that shift without making the entire bet on one name.
What to watch before investing
If you are researching defence tech, a few questions matter. Is spending growth broad-based or concentrated in one market? Are companies winning recurring contracts or one-off deals? Are profit margins improving as demand rises? And are investors paying a sensible price for future growth?
It is also worth separating a powerful narrative from a strong investment case. Geopolitical tension can support the theme, but markets often move before the story feels obvious. By the time everyone agrees a sector looks exciting, a lot of optimism may already be reflected in prices.
The bottom line
Defence technology sits at the intersection of innovation, policy and national security. That makes it complex, but it also makes it increasingly relevant for investors trying to understand where capital may flow next.
The big idea is simple: the future of defence is not only heavier hardware. It is also smarter software, autonomous systems and the infrastructure that ties it all together. That shift could keep defence tech on investors’ watchlists for years to come.
Further reading from Global X
Defence Technology: Shield of Innovation
