Venture money is pouring into defense tech at a pace that makes the AI boom look almost restrained, and the fight now is over whether it's smart capital or a bubble waiting to pop.
Defense and security startups have raised $12.3 billion in venture funding since the start of 2026, according to Bloomberg, almost double what the sector pulled in over the same stretch last year and already ahead of the $9.95 billion raised in all of 2025. Dealroom puts the broader figure even higher, at $17.4 billion year to date. However you slice the count, the direction is the same: money that used to chase generic AI startups is rotating hard into autonomy and sensors - and drones - wearing a military label.
The clearest signal landed this week. Bloomberg reported that Expeditions, a Warsaw based venture firm backed by BAE Systems and the NATO Innovation Fund, closed a €197 million, about $225 million, second fund dedicated to European defense and deep tech startups. Limited partners include the Polish Development Fund and executives from Skype, Wise, Bolt and Snowflake, hardly a roster of defense industry lifers. That's part of the story: consumer tech money is now underwriting sovereign military hardware.
Just five days earlier, CNBC reported that Quantum Systems, a German maker of autonomous surveillance and strike drones, closed a $1.2 billion Series D at an $8 billion valuation, the largest private defense tech financing in European history. Blackstone, Airbus, Advent and Fidelity Management & Research Company all put money in. Quantum Systems, founded in 2015 by former German Air Force pilot Florian Seibel, started out selling drones to farmers for crop surveying. It says its systems flew more than 19,000 missions in Ukraine last year alone.
Zoom out and the same pattern repeats across the sector. Anduril Industries raised a $5 billion Series H in May that valued it at $30.5 billion, according to PitchBook, and some recent reporting puts the company closer to $61 billion. Shield AI closed a $2 billion Series G in March. Saronic, which builds autonomous ships, raised $1.75 billion at a $9.25 billion valuation. PitchBook counted $19.8 billion deployed into defense tech in the first quarter of 2026 alone, up from $5.7 billion in the same quarter of 2024.
Here's the thing that makes this more than a niche story for defense industry watchers: most of what's being funded isn't tanks or missiles. It's software and sensors, machine learning models wrapped around a drone or a ship. Quantum Systems sells autonomy and AI driven targeting. Anduril's Lattice platform is a software layer for battlefield sensor fusion. These are AI infrastructure companies that happen to sell to defense ministries instead of enterprise IT departments, and the capital rotation reflects that. Money that might have chased another foundation model startup is landing on a drone maker instead, because the revenue is real and the customer, a government, isn't going anywhere.
Not everyone thinks the multiples make sense. Anduril trades at roughly 28 times its 2025 revenue, Fortune reported, while legacy contractors like Lockheed Martin and RTX trade at low single digits. Anduril's own CEO, Brian Schimpf, told the Fortune Brainstorm Tech conference in June that he'd answer "yes" if asked whether the sector is in a bubble. Trae Stephens, an Anduril cofounder and Founders Fund partner, has said the real problem is too much venture supply chasing too few credible companies, which pushes early stage startups to prices of 17 to 50 times revenue before they've landed a program of record.
That distinction, program of record or not, is the one that actually separates the winners from the pretenders. A defense startup with a signed multi year Pentagon or NATO contract has revenue a bank can underwrite. One that's still working through pilots and demonstrations is betting on a sale that may never close. Shield AI, valued at $12.7 billion, still carries plenty of contracts in that earlier, uncertain category.
For founders and investors watching from outside the sector, the lesson isn't that defense tech is safe money. It's that governments have become the customer everyone wants, because unlike a consumer subscriber, a defense ministry doesn't churn. Whether that logic survives the next funding round at 30 times revenue is the question this year's bubble callers are actually asking.
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