Defense Tech VC: Bubble or Structural Shift?

Venture capital poured $19.8 billion into defense tech in the first quarter of 2026. That is more than the sector raised in all of 2022 — in three months.

The number comes from PitchBook: 262 deals, Q1 alone, a record that makes the previous peak of $17.9 billion (Q2 2025) look like a warm-up. Q1 2024, just two years ago, stood at $5.7 billion.

The obvious question — one that even the company's own CEO raised unprompted at Fortune's Brainstorm Tech conference in June — is whether this is a structural reallocation of venture capital toward a permanently larger defense technology sector, or a bubble that will leave a trail of overvalued startups when the geopolitical cycle turns.

Anduril is the emblematic case on both sides of that argument. It is simultaneously the strongest evidence for the structural thesis — $2.2 billion in revenue, doubled year over year — and for the bubble thesis: a $61 billion valuation on a company that is still projecting a $1.2 billion operating loss for 2026.

The arc: from $4.7 billion to $19.8 billion

Between 2022 and 2023, quarterly defense tech investment ranged from $4.7 billion to $9.5 billion. Capital arrived in bursts — a big Anduril round here, a Shield AI close there — but the pattern was episodic. No one treated defense as a core allocation.

2024 began to change that. Q1: $5.7 billion. Q4: $8.9 billion. The progression was steady, not spike-driven, and it reflected a shift in how institutional investors thought about the sector. Autonomy was no longer a research project. Ukraine had made it a procurement priority.

Then came 2025.

Q2 hit $17.9 billion in a single quarter — more than any full year before 2024. The rest of 2025 stayed elevated: $11.3 billion in Q3, $14.2 billion in Q4. By year-end, total defense tech VC had reached $29 billion, nearly triple the 2020 figure. The number of deals had grown too — from 414 in 2020 to a peak of 629 in 2024 — but the real story was in check sizes, not counts.

2026 accelerated the same pattern. Through May alone, defense tech startups raised $14.6 billion, already surpassing 2025's full-year record before summer began.

The bubble case

Fortune ran the argument on July 2 under a headline that did not hedge: "The defense tech boom has become a bubble — or it will be soon."

The data supporting the bear case is not hard to find. Early-stage defense startups are raising millions at multiples of 17x to 50x revenue. Anduril — valued at $61 billion — trades at roughly 28x its 2025 revenue of $2.2 billion. For context, Palantir — a public company with similar government exposure and actual program-of-record revenue — trades at around 18x.

Its CEO Brian Schimpf, asked directly whether the market is overheating, answered with a qualified yes: "When there are successful companies, you have lots of other companies and investors chasing that, and there can be very risky behavior. We've been very careful at every stage to manage this, but it's easy to chase those valuations if you're not being careful."

Trae Stephens, its co-founder and Founders Fund partner, framed the problem in supply-side terms: "All of these funds are competing with one another to win deals, and the best lever they have to win deals is price. They keep chasing, chasing, and chasing."

The structural worry is that venture capital is the wrong instrument for defense hardware. Traditional software companies start with low operating expenditure and scale through sales and marketing spend. Defense tech requires significant capital expenditure upfront — for factories, certification, supply chains — and faces procurement timelines measured in years, not quarters. The "valley of death" between a working prototype and a program-of-record contract has killed companies with stronger technology and weaker balance sheets.

The structural case

PitchBook published its own framing in June: "The Iron Bubble: Why defense tech might not be overhyped." The thesis is that what looks like valuation excess is actually a catch-up repricing after decades of systematic underinvestment.

The numbers on the other side are equally compelling. U.S. VC investment in defense tech reached $21.4 billion in 2025, nearly triple the $7.7 billion invested just two years earlier. But the Pentagon's procurement budget tells a different story: the NatSec100 — the top 100 venture-backed defense startups — capture only 0.5% of Department of Defense contract obligations. The remaining 99.5% still flows to traditional primes like Lockheed Martin, Northrop Grumman, and RTX.

This is not a sign of a saturated market. It is a sign of a market that has barely begun to penetrate its addressable customer.

The DoD's own actions support the structural view. The Pentagon's proposed $54 billion for the Defense Autonomous Warfare Group in fiscal 2027 provides a clear demand signal. The Defense Innovation Unit has reduced the time from problem identification to field deployment to two years or less. Its takeover of the Army's $22 billion IVAS program from Microsoft would have been unthinkable five years ago.

European defense spending is projected to grow 3.4 times over the next six years, making defense the continent's fastest-growing sector. Dual-use models — where the same technology serves commercial and government customers — are creating larger addressable markets and diversifying revenue risk in ways that pure-play defense contractors never could.

Capital concentration at scale

What unites the two narratives is the sheer scale of capital flowing into a small number of companies. Anduril raised $5 billion in a Series H led by Andreessen Horowitz and Thrive Capital, bringing total funding to $6.26 billion since founding. Shield AI raised $2 billion in a Series G led by Advent International and JPMorgan Chase. Saronic raised $1.75 billion in a Series D led by Kleiner Perkins for autonomous naval vessels.

These three companies alone accounted for $8.75 billion — more than the entire defense tech sector raised in any full year before 2024.

The concentration is extreme by design. Defense is not a market that rewards fragmentation. The barriers to entry — security clearances, manufacturing scale, program-of-record certification, congressional relationships — create natural oligopolies. The venture thesis is not that dozens of defense startups will succeed; it is that two or three will become the next generation of primes.

The question is whether current valuations already price that outcome — or whether the market is paying software multiples for hardware businesses with hardware timelines and hardware risks.

Development scenarios

What to watch

The debate between bubble and structural shift will resolve around one concrete signal: whether the companies raising capital at 2026 valuations can convert their money into programs of record before their burn rates force down rounds.

As we wrote in July, the defence robotics market is navigating its own version of this transition — from prototype funding to production scale. The same question applies across the entire defense tech stack.

For now, the data supports both readings. That is exactly what makes the moment interesting.