SK Innovation's stock surged 11.23% on Sept. 9, closing at 153,500 won per share. Intraday, it peaked at 153,600 won—a 52-week high. On Sept. 10, it closed at 153,100 won, down 0.26% from the prior day, as the stock steadied after the jump.
Market cap stands at KRW 25.88 trillion with a P/B ratio of 1.18x. Yet its trailing P/E registers at -7.27x—negative. Here's why.
The Divergence Within the Sector
Over the past three months, moves within the refining and chemical sector have been starkly divided. Lotte Chemical -18.7%, LG Chem -23.7%, SKC -36.3%. The three chemical makers fell in tandem, with a sector median of -21.2%. Refining told a different story: SK Innovation +36.1%, S-Oil +35.8%. The two refiners posted nearly identical gains. This is not a sector-wide move but rather crude-price momentum lifting refining while chemical fundamentals weakened independently.
SK Innovation three-year stock performance
What Triggered the Sept. 9 Surge?
Crude oil prices strengthened on Middle East tensions, reviving refining-margin expectations. Simultaneously, SK On—SK Innovation's battery subsidiary—announced U.S. energy-storage market expansion. The stock drifted through morning trading before afternoon investor flows sparked consecutive new highs.
The battery announcement: SK On signed an Aug. 27 supply deal with U.S.-based Neobolt Power for 9 gigawatt-hours of lithium iron phosphate (LFP) pouch battery cells, valued at roughly KRW 1.5 trillion, with deliveries from next year through 2031. SK On is also pursuing an additional 9-GWh commitment with the same partner by year-end, which would bring total contracted volume to 18 GWh—approaching half of SK On's full-year 20-GWh order target.
But Have Earnings Actually Improved?
Full-year 2025: revenue of KRW 80.3 trillion, operating profit of KRW 448.7 billion—up 42.2% from 2024's KRW 315.5 billion. But Q4 inflicted a major hit. As SK Innovation restructured its Ford joint venture (BlueOval SK), it wrote down SK On's asset value by KRW 4.2 trillion. This drove Q4 pre-tax loss to KRW 4.36 trillion and full-year 2025 pre-tax loss to KRW 5.82 trillion.
That explains the negative P/E: trailing earnings per share sit at -21,056 won, still overshadowed by that write-down.
SK On's Seosan facility
Yet 2026 has shifted dramatically. Q1 operating profit hit KRW 2.16 trillion—a 632% sequential jump, lifted by crude-driven inventory revaluation gains and the lagging-cost recovery effect from prior-year low oil prices. Q2 accelerated further: KRW 3.49 trillion in operating profit, with lubrication subsidiary SK Enmotion contributing KRW 691.9 billion and battery subsidiary SK On contributing KRW 821.8 billion—SK On's first profitable quarter.
By the numbers: full-year 2025 operating profit was KRW 448.7 billion. Q1 and Q2 2026 combined reached KRW 5.65 trillion—over twelve times the prior year's annual total. While net-income metrics still bear the Q4 2025 charge, the underlying operating pace has fundamentally reoriented.
The Lingering Concerns
SK On's debt load remains substantial. As of end-2025, SK Innovation's group net debt stands at KRW 22.51 trillion, with SK On accounting for KRW 15.39 trillion—over two-thirds. Current obligations—current portion of long-term debt and short-term borrowings—total KRW 8.27 trillion due within one year. SK Innovation has approved a merger of SK On with lubrication subsidiary SK Enmotion, but combining a loss-making subsidiary with profitable refining and lubrication operations during a commodity boom has triggered shareholder concerns.
Valuation is not stretched: a P/B of 1.18x sits unremarkable within the refining and chemical peer set. However, rallies anchored to crude prices tend to reverse when oil momentum fades, a dynamic worth remembering.
SK Geocentric's Ulsan facility
What Analysts Say
BNK Investment Securities maintained a KRW 170,000 price target on July 31, forecasting 2026 operating profit above KRW 9 trillion. iM Securities held a KRW 190,000 target as of Sept. 1. Analyst Yu-jin Jeon assessed the ESS contract as "falling short of offsetting SKIET merger concerns, but an event that does ease some of the disappointment." Both targets sit above Sept. 10's close of 153,100 won.
SK On battery facility in the U.S.
The Bottom Line
While chemical peers retreated, SK Innovation seized a unique combination: refining margin upside and SK On's battery profitability inflection—capturing a 52-week high. Last year's Q4 charge still haunts net-income measures, but operating direction has clearly shifted.
Two developments will clarify whether this high proves durable or a one-off event: whether SK On closes its additional 9-GWh Neobolt commitment by year-end, and whether Q3 results (expected late October) sustain Q2 profit momentum. Crude-price weakness would rewrite the story entirely—since the rally rests on oil strength, a correction in crude markets would likely pull the stock lower.
This article is for informational purposes based on public filings and market data and does not constitute investment advice or a recommendation to buy or sell any security.
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