AT&T leads U.S. Carrier Ethernet market as M&A reshapes provider rankings

The rapid ascent of Verizon and Zayo underscores how aggressive M&A is currently the primary driver for gaining retail port share in a maturing connectivity landscape. For streaming providers and content delivery networks, this consolidation simplifies the vendor ecosystem but may reduce long-term pricing leverage as fewer players control the underlying fiber infrastructure. The shift toward SD-WAN and SASE indicates that enterprise video traffic is increasingly managed through software-defined layers rather than traditional private circuits. Watch for the next leaderboard update to reflect Charter's acquisition of Cox, which will likely trigger another significant ranking shift among the top five providers.

The U.S. Carrier Ethernet market has undergone significant consolidation over the past year, with multiple acquisitions reshaping the competitive landscape. Verizon completed its $20 billion acquisition of Frontier Communications in early 2026, adding substantial fiber route miles and enterprise Ethernet ports to its existing network footprint. The deal, first announced in September 2024, gave Verizon immediate scale in markets where Frontier had built deep fiber penetration, particularly in the Midwest and Northeast. Meanwhile, Zayo Group closed its acquisition of Crown Castle's fiber business in the first half of 2026, a transaction that added approximately 16,000 route miles of fiber to Zayo's existing backbone and propelled the company into the top tier of Ethernet providers for the first time.

The transition from traditional private-line Ethernet toward SD-WAN and SASE architectures is accelerating among enterprise buyers, driven by cost pressures and the need for more flexible connectivity. Gartner projected that global SD-WAN revenue would exceed $7 billion by end of 2026, up from roughly $5.2 billion in 2024, as enterprises migrate branch-office traffic away from MPLS circuits. This shift is directly relevant to Carrier Ethernet providers because many are repositioning their Ethernet access as underlay for SD-WAN overlays rather than selling dedicated private lines. Lumen Technologies reported in its Q2 2026 earnings that its enterprise networking segment saw double-digit growth in SD-WAN and SASE attach rates, even as legacy Ethernet revenue declined year over year. The company has been aggressively bundling Ethernet access with its software-defined networking platform to retain enterprise accounts.

On the technical side, the Ethernet market is evolving toward higher-speed interfaces and more automated provisioning. The MEF (Metro Ethernet Forum) published updated MEF 3.0 standards in 2025 that define automated lifecycle management for Ethernet services, enabling carriers to offer self-service bandwidth adjustments and API-driven provisioning that compete with cloud-native connectivity models. AT&T, which holds the top position on the Vertical Systems Group leaderboard, , positioning the carrier to serve hyperscaler and content-delivery customers requiring higher-capacity handoffs. Charter Communications, which is expected to move up the leaderboard following its pending acquisition of Cox Communications, , a transaction that will combine the two companies' enterprise Ethernet and broadband footprints into a single national platform. Further integration efforts are already underway, as .