Jang Yong-seok

Jang Yong-seok serves as CEO of SK Inc, the holding company at the apex of SK Group — South Korea's third-largest chaebol. SK Inc holds controlling or significant stakes in the group's major operating companies: SK Hynix (the world's #2 memory chip maker and HBM leader), SK Telecom (Korea's largest mobile operator), SK Innovation (petroleum refining and EV batteries through SK On), SK E&S (natural gas and energy), and numerous other subsidiaries across biopharmaceuticals, materials, and other industries. SK Inc's most valuable holding is its stake in SK Hynix — given the company's dominant position in HBM memory for AI GPUs, this single asset represents a significant portion of SK Inc's sum-of-the-parts valuation. However, like most Korean holding companies, SK Inc trades at a substantial discount to its net asset value — the "holding company discount" reflecting governance concerns, conglomerate complexity, and limited direct cash flow from subsidiaries. SK Group has been aggressively investing in what it calls "green future" businesses: EV batteries (SK On, a joint venture partner with Ford and Hyundai), hydrogen economy, renewable energy, and biopharmaceuticals. Key stock drivers include SK Hynix share price (the dominant factor), SK Innovation/SK On battery business progress, holding company discount trajectory, SK Group capital allocation decisions, corporate governance reform expectations, and the performance of the broader SK Group portfolio.