ASX defence shares have been among the market's strongest performers this year, and the counter-drone theme has been a dominant one.
Drones have reshaped modern conflict: detecting and defeating them has become a spending priority for governments worldwide.
Three ASX-listed companies are at the heart that supply chain, though their risk profiles could hardly be more different.
One is scaling rapidly with a record order book, another has momentum clouded by a regulatory investigation, and the third is a micro-cap that has just walked back its guidance.
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ASX defence shares in focus: Electro Optic Systems
Electro Optic Systems Holdings Ltd (ASX: EOS) delivered a blockbuster update this week.
First half 2026 revenue came in at approximately $169 million, a 284% increase on the prior year. The company's order book reached a record $846 million at 30 June, up 84% from $459 million at the end of 2025. Available cash stood at $256 million, with a further $30 million in unused debt facilities.
Management upgraded FY26 base business revenue guidance to between $280 million and $300 million, and underlying EBITDA is expected to be positive for the first half. What is worth noting is that the upgraded guidance excludes any contribution from MARSS, the European command-and-control business acquired in May, with management expecting to update that outlook during August.
Recent wins include a roughly $175 million Slinger counter-drone order from a UAE customer.
To put things into context, EOS shares have risen 140% over 12 months, against a 1% gain for the S&P/ASX 200 Index (ASX: XJO).
DroneShield
DroneShield Ltd (ASX: DRO) is the purest counter-drone exposure on the ASX.
In its latest results, first quarter 2026 revenue jumped 121% to $74.1 million. The company finished March with $222.8 million in cash and no debt.
Its sales pipeline now spans 312 projects worth roughly $2.2 billion, including one opportunity carrying a $730 million price tag.
The company's half year results are scheduled for 26 August.
However, not everything is smooth sailing for this stock. Governance is a key concern: ASIC is formally investigating the company's ASX announcements and share trading during November 2025.
Moreover, shareholders also delivered a first strike against the remuneration report at the annual general meeting, with more than half voting against it. This has the potential to trigger a board spill if repeated next year.
Ava Risk Group
Ava Risk Group Ltd (ASX: AVA) is the smallest and most speculative of the three.
What does the company actually do? Ava supplies fibre optic sensing and perimeter intrusion detection rather than counter-drone systems specifically.
That places the company adjacent to the counter-drone theme. Perhaps as a result, Ava has not been able to capture the same momentum as its counter-drone peers.
The company recently guided FY2026 revenue to approximately $29.0 million, below its previous range of $34 million to $37 million. Management attributed roughly $6.0 million of the shortfall to delayed rather than lost orders. Gross margins were maintained at 60% to 64%, and underlying EBITDA is expected to be modestly positive.
In positive news, the company also secured a place on the Department of Home Affairs Border Protection Technologies Panel, which opens access to a recurring pipeline of Commonwealth contracts.
The risks across these ASX defence shares
Defence revenue is lumpy by nature: orders slip and government budgets shift.
Ava's downgrade is a reminder of exactly that.
Valuations have also run hard across the sector, so investors looking to get fresh exposure to the sector will be paying a large price for these shares.
Foolish takeaway
The counter-drone thesis looks set to continue into the future.
Conflicts in Ukraine and the Middle East have provided a durable long-term tailwind for these companies.
But ASX defence shares are not a homogeneous group.
EOS is delivering at scale, DroneShield has momentum shadowed by governance questions, and Ava is a micro-cap working through a downgrade.
Investors should recognise company-specific risks and weigh each stock on its own merits rather than buying the theme wholesale.
