SK Telecom (SKM) Stock; Ticks Up as AI Expansion Softens Impact of Cybersecurity Costs

TLDRs;

• SK Telecom earnings fell sharply in FY2025, but most losses were driven by one-off cybersecurity and customer support costs.
• 5G subscriber additions rebounded in the second half, helping stabilize the company’s core telecom business.
• The AI segment grew nearly 35%, supported by data center expansion and a major AWS partnership.
• Investors appear focused on SK Telecom’s AI-led transformation rather than near-term profit weakness.

Shares of SK Telecom Co. (NYSE: SKM) edged higher in recent trading as investors weighed a sharp earnings decline against accelerating momentum in artificial intelligence and steady 5G subscriber growth. While FY2025 results were weighed down by significant one-off cybersecurity costs, the market appeared to focus on the company’s longer-term pivot toward AI infrastructure, data centers, and next-generation digital services.

SK Telecom reported FY2025 revenue of KRW 17.1 trillion (about US$108.8 billion), representing a 4.7% year-over-year decline. Operating income fell more sharply, down 41.1% to KRW 1.07 trillion, while net income slid 73% to KRW 375.1 billion. Despite the headline weakness, investors viewed the earnings hit as largely non-recurring rather than a sign of structural deterioration in core telecom operations.

Cybersecurity Costs Hit Earnings

The biggest drag on profitability stemmed from a cybersecurity incident in 2025 that triggered extensive customer support measures. Management emphasized that the income decline was not driven by everyday operating performance, but by extraordinary expenses tied to restoring customer trust and system security.

SK Telecom Co.,Ltd, SKM

During the second quarter, SK Telecom booked roughly KRW 250 billion in one-off charges, including compensation to dealers and retail partners as well as costs related to USIM replacements. These provisions were based on a conservative assumption that all mobile customers might request replacements, significantly inflating near-term expenses.

The impact extended into the second half of the year. The company launched a Customer Appreciation Package valued at approximately KRW 500 billion, which included a 50% discount on August mobile bills. Management linked this initiative directly to weaker third-quarter results, reinforcing the view that earnings pressure was front-loaded rather than ongoing.

5G Adds Offset Subscriber Losses

Subscriber trends told a more nuanced story. SK Telecom experienced a sharp drop in mobile network operator handset subscribers between late March and June, losing roughly 750,000 users during the height of the cybersecurity fallout. However, subsequent quarters showed gradual stabilization.

In the third quarter, the company added around 240,000 5G subscribers, bringing the total to 17.26 million. That momentum continued into Q4, with another 230,000 additions, lifting the 5G base to 17.49 million by year-end. Fixed-line internet subscriptions also recorded growth, helping to offset earlier mobile churn and signaling resilience across the broader connectivity business.

AI Business Gains Momentum

The clearest bright spot in FY2025 was SK Telecom’s artificial intelligence segment. The company said its AI business expanded by nearly 35% year over year, driven by higher utilization of data centers and expansion into new facilities.

A key milestone was the development of a joint AI data center project with Amazon Web Services in Ulsan, underscoring SK Telecom’s ambition to become a major AI infrastructure provider rather than a traditional telecom operator. In January 2026, the company also advanced to Phase 2 of South Korea’s government-led Sovereign AI Foundation Model initiative, strengthening its position within the country’s national AI strategy.

Management has outlined plans to integrate AI across all telecom operations in 2026, with the goal of improving customer experience, automating processes, and ultimately lifting profitability over time.

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