Electro Optic Systems Holdings Ltd (ASX: EOS) shares have returned from a trading halt and are sharply lower in early trade on Tuesday.
In morning trade, the ASX defence stock was down as much as 16% to $5.05 before staging a recovery of sorts.
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Why are EOS shares crashing?
Investors have been selling the defence technology company's shares this morning after it issued a lengthy response to allegations made by US-based short seller Grizzly Research.
Last week, Grizzly Research published a report alleging various issues at EOS. However, Grizzly has disclosed that it holds a short position in EOS shares, meaning it stands to benefit financially if the share price falls.
In response, EOS requested a trading halt and has now released a detailed statement rejecting what it describes as the report's "misleading, manipulatory and pejorative" conclusions. The company also revealed it has instructed legal advisers in Australia and Germany to consider potential legal action.
Even so, the mere presence of a high-profile short seller report is often enough to rattle markets, particularly after a strong run in a company's share price.
The EOS response
The company's response was long, but the main points can be boiled down into a few key themes.
Firstly, EOS strongly disputes the suggestion that recent share price gains were artificial or unsupported. It points to a surge in global defence spending, increased demand for counter-drone technology, and a sharp rise in its unconditional order book, which grew from $136 million at the end of 2024 to $459 million at the end of 2025. It said:
EOS is strongly of the view that the increased intake of unconditional orders over the course of 2025 is one of the key drivers of the share price appreciation recently observed.
South Korean order
Second, EOS addressed concerns around a conditional Korean high-energy laser contract worth US$80 million. The company stressed that the contract was clearly disclosed as conditional, it was not included in the $459 million secured order book, and EOS has not incurred significant costs while conditions remain unmet.
EOS said it continues to work with its Korean partner, Goldrone, but reiterated that the contract may or may not ultimately become unconditional. It is possible that some investors were treating this contract win as a certainty, but these comments have created significant uncertainty with the contract which could be weighing on EOS shares today.
MARSS acquisition
The company also defended its acquisition of MARSS, which is a counter-drone software business.
EOS rejected claims that MARSS had minimal revenue, saying Grizzly's analysis ignored revenue generated outside the UK. According to EOS, MARSS generated approximately 243 million euros of revenue between 2020 and 2025 across multiple jurisdictions.
Finally, EOS pushed back on claims relating to its balance sheet. It said the sale of its EM Solutions business was part of a strategic refocus, not a forced move to pay down debt, and highlighted that it currently holds over $100 million in cash with no drawn debt.
Despite today's and recent weakness, EOS shares are up approximately 300% since this time last year.
