This Week: Q1 '26 Earnings - AT&T, Comcast, and Charter and the Rise of Fiber Castles

The Q1 2026 earnings release shows AT&T’s convergence strategy delivering mixed results. Inside its expanding fiber footprint the company added roughly half‑million new subscribers, while areas without fiber saw continued churn. Analysts estimate that fiber deployment contributes a 5 % share lift and a 15 % revenue boost, a benefit that applies across incumbents and smaller ILECs alike. AT&T’s recent Connect One bundle, which pairs converged mobile and fixed services, is positioned to mitigate the structural weakness of Fixed Wireless Access (FWA) in non‑fiber markets.

Comcast and Charter painted contrasting pictures. Comcast’s net additions in residential broadband turned positive and its wireless segment posted a record quarter, lifting its overall Net Promoter Score (NPS) for cable services for the first time in years. In contrast, Charter’s cable churn accelerated and its wireless growth lagged, marking the first quarter in three years where Comcast outpaced Charter on wireless additions. Fixed Wireless Access continues to enjoy a high NPS—about 30 points above legacy cable—but its 150 Mbps sports‑streaming requirements expose performance gaps that fiber can close.

The broader market signals that fiber‑castle advantage will increasingly separate winners from laggards. Companies with limited fiber, such as AT&T, must either accelerate capital‑light fiber builds like gigapower or rely on innovative bundles to retain high‑value customers. Meanwhile, Verizon’s historically weak Q1 performance and T‑Mobile’s pending merger with Deutsche Telekom add further uncertainty to the competitive landscape. Investors should watch EBITDA trends, especially at Charter, where higher‑priced bundles are testing price elasticity, and monitor how quickly incumbents can convert FWA‑attracted churners into long‑term fiber subscribers.