Investing.com - A rare convergence of three simultaneous market events on Thursday, October 8 is set to expose Samsung Electronics to an unusual burst of near-term volatility, Goldman Sachs analyst Heather Oh warned in a note to clients.
"The combination of 3Q prelim report + potential mechanical selling from semiconductor ETF rebals + options expiry + buyback roll-off could induce increased volatility in Samsung Elec in the near-term, particularly on Oct 8," she wrote.
Samsung Electronics is the direct focal point of all three events simultaneously, making it the primary instrument through which investors in Korean semiconductors will feel Thursday's volatility.
Traders seeking a hedge or expression of the rebalancing flow should note that Goldman also flags mechanical buying pressure building in SK Hynix, SK Square, and equipment names including Isu Petasys, Wonik IPS, and Hanmi Semi as a counterpart to Samsung's expected mechanical selling.
On the earnings side, Goldman Sachs estimates Samsung's 3Q26 operating profit at W106 trillion, in line with street consensus of W105.5 trillion, according to Oh's note — though that figure represents a 5% cut from Goldman's prior estimate of W112 trillion.
The bank attributed the revision primarily to Korean won strength, with the average USD/KRW rate tracking around 1,418 versus Goldman's prior assumption of 1,460. Street consensus has itself declined from an August peak of roughly W114 trillion for the same reason.
Despite the estimate cut, Goldman maintained a constructive view on the operating fundamentals underpinning the result. "GIR believes W100tn+ OP is backed by solid DRAM/NAND fundamentals, with HBM growth the standout," Oh said.
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Goldman expects Samsung's HBM bit shipments to grow close to 50% quarter-on-quarter in 3Q26, driven by the ramp of HBM4 shipments.
Conventional DRAM bit growth, by contrast, is described as "largely flattish given the limited level of inventory" because incremental capacity is being reallocated toward HBM production.
The ETF rebalancing layer adds a mechanical dimension that is largely independent of earnings quality. Seven semiconductor ETFs with combined assets under management of roughly W19 trillion (approximately $14 billion), according to Goldman, are scheduled to rebalance on October 8.
Local media and the street anticipate Samsung will face outflows due to a weighting cap in those vehicles, while SK Hynix and semiconductor equipment makers absorb the offsetting inflows.
Samsung's W15 trillion repurchase program was expected to be completed this week, eliminating a reliable source of daily buying support at a moment when selling pressure from multiple directions is elevated.
That selling pressure was already visible in the days leading into the event. Foreign investors were net sellers of Samsung for five consecutive days ahead of October 8, totaling net outflows of approximately $2.6 billion, according to Goldman's note.
The firm's own trading desk reported a sell-skewed flow pattern through September, with hedge funds more sell-biased than long-only accounts, and Oh noted the desk remained better sell-skewed on October 8 itself.
Looking beyond Thursday's event cluster, Goldman's watch list is straightforward. "Whether foreign inflows return back and company keeps the strong earnings momentum/guidance would be a key to watch," Oh wrote.
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