Highlights

• Etherstack's US Subsidiary has agreed to a US$1.8 million expansion with its primary Tier 1 US telecommunications carrier, extending a project first disclosed in August 2025.

• The uplift covers new feature requests and additional professional services, including further end-customer interconnects with public safety agencies.

• Revenue from the expansion is expected to be recognised predominantly within the next 90 days, contributing to both FY26 and FY27 results.

• Management noted that projects of this nature typically carry scope for further functional, durational, and revenue growth beyond the current expansion.

Etherstack plc (ASX:ESK), a wireless technology company specialising in mission-critical radio technologies and listed on the Australian Securities Exchange under the ticker ESK, announced a material expansion of its primary project with a Tier 1 US telecommunications carrier. The agreement, reached through Etherstack's US subsidiary, Etherstack Inc., adds US$1.8 million to the existing contract value and covers both new feature requests and additional professional services linked to deployments and further end-customer interconnects with public safety agencies. The development represents continued commercial momentum in the company's MCX Business unit and extends an engagement that was first disclosed to the market in August 2025. For a company whose business model is built around licensing and deploying its wireless interoperability technology to large network operators and equipment manufacturers, sustained contract growth of this kind reflects the depth and stickiness of the customer relationship and the ongoing relevance of the underlying product to the carrier's operational requirements.

Background to the US Carrier Relationship

The origins of the relationship date to the previously announced project with the Tier 1 US carrier, which involves Etherstack's 3GPP LMR-IWF product — a technology platform that enables interoperability between traditional land mobile radio systems and modern mission-critical cellular networks, commonly referred to as MCX. The LMR-IWF standard is an internationally recognised telecommunications protocol designed to allow first responders, utilities, and other critical infrastructure operators to communicate seamlessly across both legacy radio systems and next-generation cellular infrastructure. As public safety agencies in the United States and globally continue to migrate toward broadband-enabled communications, the Demand for interworking functionality of this kind is expected to remain a persistent requirement for large carriers serving emergency services networks. The expansion specifically includes additional end-customer interconnects with public safety agencies, which suggests the carrier is continuing to onboard new agency customers onto its platform, each of which may require custom integration work and ongoing technical support from Etherstack.

Scope of the Expansion and Product Context

The revenue from the expanded scope is expected to be recognised predominantly over the next 90 days from the date of announcement, with contributions flowing across both the FY26 financial year ending 31 December 2026 and into the FY27 period. Management's accompanying commentary noted that projects of this scale and complexity often retain the capacity for further growth, whether through expanded functionality, extended durations, or additional revenue milestones, a characterisation consistent with the evolutionary nature of large carrier deployments where requirements typically develop over time as the platform matures and new agencies are added. Etherstack maintains offices and Research and Development facilities across Reading in the United Kingdom, Sydney in Australia, New York, Annapolis, and Yokohama, reflecting the global scale of its technical and commercial operations. The continued expansion of the US carrier project underscores the commercial Maturity of the company's LMR-IWF platform and its capacity to generate recurring and growing revenue streams from large enterprise and government customers in one of the world's most significant telecommunications markets.

Revenue Recognition and Forward Outlook

The US$1.8 million expansion of Etherstack's primary US carrier project is a meaningful commercial development that speaks to both the quality of the company's technology and the depth of the customer relationship it has cultivated over successive project milestones. For investors monitoring the company's MCX business unit, the near-term revenue contribution and management's indication of further growth potential are notable signals. The fact that this expansion followed an initial project announcement by just over a year illustrates the typical trajectory of mission-critical telecommunications projects, which often begin with a defined scope and evolve materially as the customer's deployment matures. With a global footprint and a technology platform designed for the demanding requirements of public safety and defence communications, Etherstack is well-placed to continue building on this foundation in the United States and potentially in other markets served by carriers deploying similar public safety network infrastructure. The consistent pattern of contract expansion also supports the broader Investment case for Etherstack's business model, which relies on deep integration with large carrier customers whose switching costs are significant once a technology platform has been deployed into their production network. For investors, the combination of near-term revenue contribution and management's indication of further growth potential within the same project represents a constructive update. Each additional end-customer interconnect with a public safety agency represents not just incremental revenue in the short term, but also a deepening of Etherstack's presence within the broader network architecture of the carrier — a form of technical entrenchment that can be difficult and costly for the carrier to reverse. As public safety agencies around the world continue to accelerate their transition from legacy radio-only networks toward integrated broadband and radio systems, the demand for LMR interworking functionality of the kind Etherstack provides is likely to remain a persistent and growing requirement for carriers serving this segment.

Key Insights

The US$1.8 million expansion of Etherstack's primary US carrier project is a meaningful commercial development that speaks to both the quality of the company's technology and the depth of the customer relationship it has cultivated over successive project milestones. For investors monitoring the company's MCX business unit, the near-term revenue contribution and management's indication of further growth potential are notable signals. The fact that this expansion followed an initial project announcement by just over a year illustrates the typical trajectory of mission-critical telecommunications projects, which often begin with a defined scope and evolve materially as the customer's deployment matures. With a global footprint and a technology platform designed for the demanding requirements of public safety and defence communications, Etherstack is well-placed to continue building on this foundation in the United States and potentially in other markets served by carriers deploying similar public safety network infrastructure. The consistent pattern of contract expansion also supports the broader investment case for Etherstack's business model, which relies on deep integration with large carrier customers whose switching costs are significant once a technology platform has been deployed into their production network. For investors, the combination of near-term revenue contribution and management's indication of further growth potential within the same project represents a constructive update. Each additional end-customer interconnect with a public safety agency represents not just incremental revenue in the short term, but also a deepening of Etherstack's presence within the broader network architecture of the carrier — a form of technical entrenchment that can be difficult and costly for the carrier to reverse. As public safety agencies around the world continue to accelerate their transition from legacy radio-only networks toward integrated broadband and radio systems, the demand for LMR interworking functionality of the kind Etherstack provides is likely to remain a persistent and growing requirement for carriers serving this segment.