South Korea's major mobile carrier KT Corp. reported a 6.1% year-on-year decline in operating profit for the July–September 2026 quarter, as costs related to a significant data breach and rising investments in artificial intelligence (AI) infrastructure weighed on its bottom line. The results, disclosed in a regulatory filing on Tuesday, 10 November, underscore the dual pressures facing the Seoul-headquartered telecom giant.

Key Financial Results

KT Corp. posted an operating profit of 505.3 billion won (approximately US$375.9 million) for the third quarter. Revenue slipped 1.8% on-year to 6.99 trillion won, while net income fell a steeper 17.5% year-on-year to 367.3 billion won. The net income decline was notably sharper than the operating profit drop, reflecting one-off compensation and legal costs tied to the data breach episode.

Data Breach Fallout Still Weighing on Earnings

KT Corp. acknowledged that its third-quarter performance was materially affected by customer compensation programmes launched in the wake of a data breach first reported in September last year. That incident led to a series of unauthorised micropayments affecting customers. South Korea's privacy regulator subsequently fined KT Corp. 53.9 billion won (approximately US$37.4 million) over the breach, which reportedly affected more than 16,000 users. The compensation outflows and the regulatory penalty together have created a sustained earnings drag across multiple quarters.

Core Mobile Business Shows Recovery Signs

Despite the headline profit decline, KT Corp. pointed to encouraging signals in its core mobile segment. The company said its premium mobile plans have driven a recovery in the mobile business since July, offering some offset to breach-related costs. This recovery in the subscriber base and average revenue per user is being watched closely by analysts tracking the carrier's ability to restore pre-breach momentum.

AI and B2B Division Gains Traction

KT Corp.'s business-to-business (B2B) and AI transformation division, which services AI-related infrastructure, recorded a 20% rise in cumulative orders compared to the same period last year. The company anticipates that its AI infrastructure business will begin generating revenue from the fourth quarter of 2026. It plans to launch operations at six newly constructed data centres in phases during 2027, and has set a target of expanding its AI data centre capacity to over 1 gigawatt by 2031. This positions KT Corp. alongside regional peers racing to capture enterprise AI demand across Asia.

Shareholder Returns and Dividend

As part of its capital return programme, KT Corp. completed a 250 billion won stock buyback in September. The company also announced a cash dividend of 600 won per share, payable on Thursday. These moves signal management's intent to maintain investor confidence even as short-term profitability remains under pressure from extraordinary costs.

With the data breach compensation cycle expected to gradually wind down and AI-driven revenue set to materialise from the fourth quarter onward, KT Corp.'s trajectory into 2027 will hinge on how quickly its new growth engines can offset legacy liabilities.