Alaska Communications Welcomes John Sims to Board of Directors

Alaska Communications Welcomes John Sims to Board of Directors

Nov. 24, 2025 – ANCHORAGE, Alaska – Alaska Communications is pleased to announce the
appointment of John Sims, President of ENSTAR Natural Gas Company, to its Board of Directors.

Born and raised in Eagle River, Sims brings deep Alaska roots and a lifelong commitment to serving the unique needs of Alaskans. His extensive leadership experience, including nearly two decades at ENSTAR, reflects a proven ability to guide organizations through growth and challenges while keeping community at the forefront. Under his leadership, ENSTAR has strengthened its role as a trusted energy provider, emphasizing collaboration and resilience, values that align closely with Alaska Communications’ vision to connect Alaskans to each other and the world.

“John’s understanding of Alaska’s communities and his track record of strategic leadership make
him an outstanding addition to our board,” said Brad Martin, Alaska Communications board chair.
“His perspective will help us continue expanding access to and delivering reliable, advanced
connectivity across the state.”

“I’m honored to join the Alaska Communications board,” said John Sims. “Reliable communication
is essential for our state’s growth and resilience, and I look forward to working with this team to
strengthen services that support our communities.”

Sims holds an MBA from the University of Alaska Anchorage and has dedicated his career to
improving infrastructure and quality of life for Alaskans. His appointment underscores Alaska
Communications’ commitment to local leadership and community-driven progress.

About Alaska Communications
Alaska Communications, an affiliate of ATN International, Inc. (NASDAQ: ATNI), is a leading provider
of mission and life-critical communications infrastructure in Alaska. The company operates a
robust and advanced statewide fiber network and a highly diverse undersea fiber optic system that
connects Alaska to the contiguous U.S. For additional information,
visit www.AlaskaCommunications.com.