Lumen Technologies (NYSE:LUMN) finalized the sale of its Mass Markets fiber-to-the-home business across 11 states to AT&T (NYSE: T) on Monday.
The $5.75 billion all-cash transaction marks a definitive turning point for the Denver-based company as it sheds its consumer-facing Quantum Fiber brand to emerge as a pure-play enterprise infrastructure provider for the AI economy.
The deal transfers more than 1 million fiber subscribers and 4 million enabled locations to AT&T, expanding the latter's reach into new major metros including Denver, Seattle, and Salt Lake City.
While Lumen is exiting the retail fiber space in these regions, it will retain its massive national fiber backbone and central offices—the "physical plumbing" required to support its booming business with hyperscalers and enterprise AI applications.
Financially, the divestiture provides a massive "de-risking" of Lumen’s balance sheet.
The company plans to use $4.8 billion of the proceeds to retire its highest-cost "super priority" debt.
This move is expected to slash annual interest expenses by $300 million and bring the company’s net debt-to-adjusted EBITDA ratio below 4x, a critical threshold for its long-term credit stability.
As part of the transition, Lumen’s consumer copper-based services will remain in-house for now, continuing to provide significant cash flow to fund the enterprise transformation.
The company’s management is expected to provide detailed 2026 financial guidance, reflecting the impact of the sale, during its Q4 earnings call on February 3.