China's Memory-Chip Push Sinks Seoul as Goldman Beats Estimates

• Macro: China's CXMT plans late-2026 shipments of server DDR5 built on a denser DRAM design, and SK hynix fell 10.09% in Seoul. The ten-year yield fell 4.2 bps to 5.202% at 9:08 AM ET ahead of U.S. inflation data.
• Market Moves: SPY (-0.09%) and IWM (+0.05%) were flat. Memory and Korea sold off on CXMT's news, with the DRAM ETF falling 5.78% and EWY close behind. Staples and real estate offset as yields eased, with XLP rising 1.04%.
• Factors: Style factors explained 56% of stock-level variance, against a 23% one-year average. Beta fell 1.06% (z=-1.1), extending a week of high-beta selling. Semiconductors fell 0.55% (z=-0.91) as CXMT's news weighed on chip exposure.
• Micro: SK hynix's U.S. shares fell 6.57%, more than half of it company-specific as the market priced CXMT as a threat to Korean DRAM incumbents. Goldman Sachs rose 3.54% on a prime-brokerage-driven surge in equities revenue. UnitedHealth rose 4.40% after raising full-year guidance.
• Watch: Does Wednesday's September CPI print on October 14 extend the long-bond rally that lifted staples and real estate, or revive the yield climb that pushed the ten-year to a 24-year peak last week?

October 13, 2026 · 09:13 ET · pre-market

Seoul's Chipmakers Fell 10% on CXMT, and Beta Kept Sliding

CXMT President Cao Kanyu said the company has made "key progress" on 4F² DRAM, a layout that shrinks each memory cell by about a third. He said the first product will be a server DDR5 module due by the end of 2026 Bloomberg. Korea JoongAng Daily reported that SK hynix fell -10.09% in Seoul on what it called "Black Tuesday", with Samsung Electronics down -7.39%. The Kospi closed -5.46% after a five-minute halt on program trading, the paper reported. The Economic Times said Broadcom CEO Hock Tan's comparison of many AI investors to casino gamblers added to the pressure. Japan's Nikkei fell -2.6% and Taiwan's benchmark -2% Economic Times.

In New York, SK hynix's U.S. shares (SKHY) are down -6.57%, erasing $72.8B of market value. Micron (MU) is down -5.18%, erasing $55.7B, and ASML is off -2.78%. The Roundhill Memory ETF (DRAM) and the Korea ETF (EWY) are now down more than 11% over five sessions. The S&P 500 ETF is roughly flat.

Our factor model attributes most of the move to Beta, which is down -1.06% at z=-1.1. Beta alone accounts for about 41% of the differences in stock returns so far, a top-decile share for the past year. Today makes three down days in five for Beta, and the five-session loss is -5.12% (z=-2.4 on that window). Over the last 20 sessions Beta is still up +1.60%. So far the drop has given back a recent gain rather than broken a long trend. The Semiconductors factor is down -0.55% and has fallen five sessions in a row, losing -2.39% over the stretch.

20-day momentum (Medium-Term Momentum in the table) is down -0.25% as last month's winners give some back. Its exposures overlap heavily with the high-beta momentum stocks, so it reflects the same selling rather than a separate signal. The top 50 high-beta momentum names are down -2.61% while the rest of the market is up +0.40%. That is milder than their since-2020 extremes on October 8 and 12. The losses have built steadily through the pre-market rather than arriving as a single gap at the start.

Outside Korea, Memory-Chip Losses Are Mostly Beta

Micron's -5.18% breaks down into -4.04% from its style exposures and just -0.81% that is specific to the company. That is how a high-beta stock with strong 12-month gains trades when that whole group is being sold. SK hynix's U.S. shares show the opposite split: -3.47% of the -6.57% is the stock's own move. That company-specific piece is where the market is pricing CXMT as a direct threat to the Korean DRAM incumbents.

Sandisk (SNDK) is down -4.73%, but its company-specific component is slightly positive, so the factor exposures explain more than the whole drop. MaxLinear (MXL) -4.23%, Astera Labs (ALAB) -3.33% and Wolfspeed (WOLF) -3.64% show the same split. In the U.S., investors are selling exposure; they are not yet marking down American memory-chip profits on CXMT's news. SemiAnalysis cautioned that CXMT's DDR5 production costs per bit are still more than 30% above incumbents'. That leaves qualifying with server customers and reaching volume production as the hurdles CXMT still has to clear.

Hedge-fund-owned stocks are slightly ahead (+0.09%, z=+0.78) and flat on a raw basis. Neither measure points to hedge funds as the sellers. Implied index volatility (Cboe VIX) is 15.29, while implied single-stock volatility (Cboe VIXEQ) is 39.08, in the 83.6th percentile of its history. Options are pricing big moves in individual stocks under a quiet index. The open question is whether Micron's company-specific share starts to look like SK hynix's.

Goldman Is Up 3.5% on Equities Trading, Wells Fargo Down 2.9%

Goldman Sachs (GS) is up +3.54%, adding $9.2B, after equities revenue jumped 72% to $6.44B on demand for prime-brokerage financing. Fixed-income trading slipped 1% Bloomberg. Wells Fargo (WFC) is down -2.87%, erasing $7.2B, after revenue of $21.87B missed a $22.3B estimate. Its corporate and investment bank fell short of forecasts. The rest of the morning's reporters:

Prosperity Bancshares (PB) is up +10.22% without a report, almost all of it company-specific. The market is moving the stock on its own, and the driver hasn't appeared in coverage yet.

Ten-Year Yield Eases 4 bps as Staples and Real Estate Rise

The ten-year Treasury yield is 5.202%, down 4.2 bps, while the two-year is up 0.4 bps at 4.795% CNBC. Long bonds are rallying while short-dated yields hold. The ten-year is now well below last week's 24-year peak of 5.365%. BlackRock has upgraded Treasuries after six years of underweighting them FT. WTI crude is $92.59 at 8:58 AM ET, -1.23% on the day CNBC. The dollar index is 102.284 at 9:07 AM ET, -0.30%, a day after its one-year high of 102.61 CNBC.

Interest-rate-sensitive defensive stocks are taking the other side of the chip selling. The consumer staples sector is up +0.83%, led by Walmart (WMT) +1.21% and Coca-Cola (KO) +1.11%. The staples and real-estate rows in the table above have added three to four percent over the week. Dow Jones linked the Treasury rally to markets looking ahead to U.S. inflation data.

Data compiled by FactorPulse AI; edited and verified by Jeff Klein. For informational purposes only. Does not constitute financial advice, an investment recommendation, or an offer to buy or sell any securities. Always consult a qualified financial professional before making investment decisions.

For more on factor construction methodology, see www.factorpulse.com/glossary.

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