Key Highlights

● AT&T reports third-quarter results before the market opens on October 21.

● Lumen fiber locations were about 25% penetrated, against about 40% in AT&T markets.

● Second-quarter revenue was $31.81 billion, with service revenue up 2.7%.

● Jennifer Biry becomes CFO on January 1, 2027.

AT&T (NYSE:T) reports third-quarter results before the market opens on Wednesday, October 21, 2026, and one metric may draw more attention than most: how many customers it has added in the roughly 4.5 million fiber locations bought from Lumen Technologies (NYSE:LUMN). CFO Pascal Desroches said on September 10 that those locations were about 25% penetrated, against about 40% in AT&T's own markets. Closing that gap could shape fiber growth, though the company has not set a formal target or timeline for it.

Latest Company Context

AT&T completed the Lumen consumer fiber acquisition in February. Desroches did not provide a current penetration rate in September. As an illustration rather than company guidance, lifting the footprint to 40% would mean roughly 675,000 additional fiber customers. Second-quarter 2026 revenue was $31.81 billion, with service revenue up 2.7% year on year and adjusted EPS up about 20%. Management's reiterated 2026 guidance includes adjusted EPS of $2.25 to $2.35, free cash flow of at least $18 billion and capital expenditure of $23 billion to $24 billion. Desroches is due to retire on December 31, 2026, with Jennifer Biry becoming CFO on January 1, 2027.

Key Business Drivers

AT&T is a member of the S&P 500, so changes in its share price and earnings may matter to index-tracking portfolios as well as active holders. The Lumen footprint is a clear driver because penetration gains typically depend on network upgrades, marketing and bundling with wireless. Executive Jenifer Robertson said it would take "several quarters to get the network efforts going at scale" and that no time frame had been set. AT&T has also said it may accept some fiber ARPU dilution to build household value, and its convergence target is 50% of internet customers also taking wireless. Analyst consensus points to third-quarter adjusted EPS near $0.60 and revenue near $31.7 billion.

What Investors Should Watch

Investors may look for any disclosure of Lumen-market penetration, fiber net additions and whether early conversion is ahead of or behind the 25% starting point. Fiber ARPU, convergence rates and copper retirement savings could indicate whether growth is coming at the expense of margin. Management's commentary on the Corning (NYSE:GLW) fiber supply agreement, reported at more than $3 billion on September 29, and its capital spending plan may show how quickly the build can move. Capital returns also remain relevant, given the reported $10 billion buyback target, and so does the leverage path toward a stated 2.5x goal in roughly three years. The CFO handover may also prompt questions on continuity.

A Measurable Test of AT&T's Lumen Fiber Strategy

The Lumen penetration gap offers a measurable test of whether AT&T's fiber strategy is translating into customer growth. A 40% level is an illustration, not a commitment, and results could differ from consensus. October 21 may provide the first fresh evidence since the September update.