Amendment to Current Report (Form 8-K/A)

Anterix and Public Utility District No. 1 of Benton County Bring Private Wireless to the Pacific Northwest

Agreement to deploy 900 MHz network marks a defining moment for the Public Utility District market

WOODLAND PARK, NJ, APRIL 21, 2026 - Anterix (NASDAQ: ATEX), the leader in mission-critical private wireless broadband spectrum for utilities, today announced that it has entered into an agreement with Public Utility District No. 1 of Benton County ("Benton PUD") of Kennewick, WA, to sell a 10 MHz 900 MHz spectrum license - establishing the first private wireless broadband deployment among publicly owned utilities in the Pacific Northwest.

Benton PUD's 900 MHz network will be utility-owned, utility-controlled, and purpose-built for the operational demands of its 927-square-mile service territory in Benton County, Washington - serving more than 58,000 customers across the communities of Kennewick, Richland, Prosser, Benton City, and Finley. The network will enable advanced grid automation, field workforce connectivity, enhanced outage detection and restoration, and the resilience required to meet Washington's Clean Energy Transformation Act obligations head on.

This agreement underscores a broader shift in the utility sector. Public Utility Districts (PUDs), both community-owned and locally accountable, are now joining investor-owned utilities in advancing private wireless adoption. What began as early innovation is quickly becoming standard practice, as utilities across ownership models recognize purpose-built connectivity as a strategic necessity.

"Our agreement with Benton PUD reflects the accelerating adoption of private wireless across the utility sector," said Anterix President & CEO Scott Lang. "PUDs are among the most mission-driven utilities in the country, directly accountable to the communities they serve. When a PUD invests in private wireless, it's because the case is undeniable."

Benton PUD General Manager Rick Dunn said, "We see private wireless broadband as foundational infrastructure for the next generation of the grid. By deploying a 900 MHz private network, we're strengthening operations, enhancing safety and service, and building a more resilient system for the communities we serve. Through Anterix and its ecosystem, we're translating this investment into measurable outcomes across our service territory."

Anterix delivers more than spectrum. The company offers a full private wireless platform that enables utilities like Benton PUD to move from agreement to operational network with speed and confidence. Additional offerings include:

• TowerX™ - nationwide tower access and site optimization, reducing the time and cost of network buildout

• CatalyX® - a turnkey connectivity management solution for device provisioning and lifecycle management across private and public networks

• Anterix Active Ecosystem - a network of more than 150 technology and infrastructure partners purpose-built for utility deployment

Together, these capabilities compress the path from spectrum acquisition to operational connectivity - a critical advantage for PUDs and other utilities building for the first time.

Anterix Shareholder Contact

Natasha Vecchiarelli

Vice President, Investor Relations & Corporate Communications

Anterix

973-531-4397

[email protected]

Anterix Media Contact

Paul Gaige

Vice President

Burson

504-957-1434

[email protected]

About Anterix

Anterix is transforming how critical infrastructure stays connected. As the nation's leading connectivity partner for utilities, Anterix delivers more secure, private 900 MHz licensed spectrum and advanced intelligent infrastructure solutions that enhance efficiency, strengthen resilience, and accelerate digital transformation. Backed by a growing ecosystem of industry-leading partners, Anterix provides the connectivity foundation that powers a more resourceful and resilient future. Learn more at www.anterix.com.