In brief
The KOSPI slipped 3 percent to 5,831.34 points, reversing gains that had lifted the index earlier in the session. Samsung Electronics posted a record 107.44 trillion won operating profit and 75.13 trillion won net profit, yet shares fell 6.6 percent after analysts said the results underperformed expectations. Market reactions included a 9.8‑percent slide in LG Energy and sharp losses in construction firms tied to nuclear project talks.
The South Korean benchmark index, the KOSPI, fell 3.01 percent—181.1 points—to 5,831.34 as of 11:20 a.m., reversing gains that had lifted the market earlier in the session. The decline followed the release of Samsung Electronics's third‑quarter earnings, which, despite a record operating profit of 107.44 trillion won (up 783.1 percent year‑on‑year) and revenue of 195.25 trillion won (up 126.9 percent), missed the consensus estimate of analysts.
Earlier that morning, the Fed had held its benchmark interest rate steady at 3.75‑4.00 percent, which had buoyed international markets and had prompted the KOSPI to touch a high of 6,100.11 points before the earnings news caused a sharp reversal.
Samsung’s Earnings and the AI‑Chip Boom
For Samsung Electronics, the third‑quarter net profit rose to 75.13 trillion won—more than six times the 12.22 trillion won reported a year earlier—making the jump a 514.6 percent increase. This surge was driven almost entirely by the company’s memory business, which accounted for 99.1 percent of total operating profit. In particular, sales of sixth‑generation high‑bandwidth memory, or HBM4 chips, expanded in response to robust demand from artificial‑intelligence server sites, and the revenue generated by HBM4 chips more than tripled compared with the prior quarter.
During the earnings call, Samsung Electronics officials noted:
It appears that our goal of securing an HBM market share equivalent to our overall DRAM market share in the second half of this year was already achieved in the third quarter.
They added that the company expected demand for memory chips to continue to grow in the fourth quarter, buoyed by sustained investment in AI infrastructure, and that Samsung Electronics would focus on profitability by expanding sales of premium products during the year‑end peak shopping season.
While the record operational results signaled a strong second‑half return for the memory business, analysts suggested that the earnings still fell short of consensus guidance, which led to the sharp sell‑off in Samsung Electronics shares, which dropped 6.61 percent.
Market Wider Reactions
The drop in Samsung shares was mirrored, albeit weaker, by other chip players; SK hynix gained 0.4 percent. The battery sector saw a sharp decline, with LG Energy Solution falling 9.76 percent after its parent unit, LG Chem, announced plans to sell 2.5 trillion won of shares in the subsidiary as a shareholder‑value initiative.
Other corporate stocks with less direct exposure to the semiconductor sector moved lower as well. Shares of construction companies part of a consortium led by the state‑run nuclear operator Korea Hydro & Nuclear Power, which had recently concluded contract negotiations over a Czech Republic nuclear project, slumped after the operator signaled that it had ended negotiations over key terms. Doosan Enerbility dipped 12.21 percent, while Daewoo Engineering & Construction tumbled 21.79 percent.
On the currency front, the Korean won was trading at 1,333.5 per U.S. dollar at 11:20 a.m., a modest increase of 8.5 won from the previous close, reflecting a small appreciation amid the market’s late‑morning retreat.
The day’s tightly correlated movements underscore the sensitivity of Korean equities to earnings surprises amid an environment marked by lingering global inflationary pressures and a rigorous AI investment cycle. Even record quarterly earnings can prompt a short‑term correction if they underperform market forecasts, illustrating the high expectations placed on the semiconductor sector by investors.
Looking ahead, Samsung Electronics appears confident that memory demand will remain robust into 2027, a view bolstered by its role as the world’s largest memory chip producer and its early start in mass production of advanced HBM4 chips. However, some industry observers express caution over the long‑term profitability of the AI market. For the time being, the Korean market is reflecting a blend of optimistic sector performance and investor caution in the face of competing economic variables.
In summary, the KOSPI’s 3.01‑percent slide after the release of Samsung Electronics' third‑quarter earnings reflects a market that is acutely responsive to earnings forecasts, even when a company records new highs in operating performance. The data point reinforces that equity markets reward not just absolute performance, but relative performance against the collective expectations of analysts and investors.
