Frost Falls on Yesterday's Rally

DAILY MARKET NOTE / 20 OCT 2026

AI Doubts Persist.
Two Days of Gains Erased.

The KOSPI (-3.73%) closed at 5,552.74. Its -0.60% opening print was the day’s high. The index gave back all 213.79 points gained on Oct. 16 and 19, slipping below its Oct. 15 close. The KOSDAQ (-3.33%) closed at 781.97.The U.S. semiconductor index (+1.61%) posted its first gain in nine sessions overnight, but gave back more than half its intraday advance. Treasury yields rose again, while concerns over AI financing and the durability of chip earnings remained unresolved.Defense was the hardest-hit sector. Hyundai Rotem’s third-quarter earnings decline and a series of broker price-target cuts sent Hyundai Rotem (-13.70%) and Hanwha Systems (-13.90%) sharply lower. Every constituent of the tracked shipbuilding and battery theme indices also fell.On the Korea Exchange's 3:38 p.m. tally, institutions sold a net ₩1.005tn and foreign investors ₩530bn; retail investors bought ₩898bn and other corporations ₩636.7bn. Just 13.1% of KOSPI stocks advanced.

Even as U.S. chip stocks posted their first gain in nine sessions, Korean shares fell across the board—including the sectors that led Monday's rebound. More than eight in ten KOSPI stocks declined.

MARKET PATH / 01

-0.60% at the open proved the day's high. The close fell below Oct. 15.

Where the selling accelerated—and where it stopped

The KOSPI opened at 5,733.57 (-0.60%), also its intraday high. Losses deepened around 9:40 a.m.; the index reached roughly 5,550 by 10 a.m. and its low of 5,493.24 (-4.76%) around 10:15. It recovered toward 5,630 by about 11:15, then weakened again after noon. From 1 p.m. it traded largely between 5,520 and 5,540, before closing at 5,552.74—1.48 points below the Oct. 15 close of 5,554.22.

KOSPI · 09:00~15:30Opened at 5,733.57 (day's high) → low around 10:15 a.m. → near 5,630 around 11:15 a.m. → 5,520–5,540 after 1 p.m. → closed at 5,552.74

OPEN5,733.57-0.60%

HIGH5,733.57-0.60%

LOW5,493.24-4.76%

CLOSE5,552.74-3.73%

THE READ

The mirror image of Oct. 19, when the opening print was the low and the close the high. The U.S. chip rebound had no staying power even at the Korean open; most of the day's decline took shape within roughly the first hour (interpretation).Both rebound attempts stalled near 5,630. The afternoon did not revisit the session low, but buying was too weak to generate much recovery. Closing roughly where the two-day advance began describes the outcome; it does not establish support.The KOSDAQ followed a similar pattern, with its high near the open. Fewer than one in five stocks advanced in either market.

OPEN · MORNING

-0.60%Opening selloff; session low around 10:15 a.m.

Opened at 5,733.57, the day's high. Near 5,650 around 9:05 a.m., then broadly 5,620–5,645 through about 9:35.Selling resumed around 9:40 a.m., taking the index to roughly 5,550 by 10 a.m. and 5,493.24 (-4.76%) around 10:15.

MIDDAY

Rebounded toward 5,630 around 11:15 a.m., then turned lower

The index pared its losses from about 10:20 a.m., reaching the 5,610 area around 10:50. After slipping toward 5,580 around 11:05, it reached roughly 5,630 around 11:15.A second test of the 5,630 area around 11:55 failed. Selling resumed after noon, taking the index toward 5,560 around 12:50 p.m.

AFTERNOON

Mostly 5,520–5,540 after 1 p.m.; closed near the Oct. 15 level

Near 5,530 around 1:05 p.m., slipping into the 5,510s around 3:10, then recovering slightly into the close at 5,552.74.The KOSDAQ opened at 805.37 (-0.44%), peaked at 807.22, touched 773.32 and closed at 781.97. KOSPI turnover was ₩15.9997tn, 93% of Oct. 19's level and 0.72 times the previous five-session average.

The line traces the KOSPI's five-minute intraday chart, with horizontal spacing reflecting actual time. Only the open, high, low and close are exact confirmed prices; other intervals are approximate levels. The low's timing is shown to the nearest five-minute bar. The upper dashed line marks the previous close (5,768.01); the lower one marks the Oct. 15 close (5,554.22).

WHY / 02

AI Funding Doubts, Exporter Earnings and a Solidigm Listing Dispute Overwhelmed the U.S. Chip Rebound

Why Korea fell while U.S. semiconductors rose

IN PLAIN ENGLISHU.S. chip stocks finally rose after eight consecutive declines, but gave back more than half their intraday gain. Questions about the cost of AI investment and the sustainability of semiconductor profits persisted as Treasury yields climbed. In Korea, the won was at its strongest in two years, while earnings expectations for exporters—including defense, shipbuilding and autos—had been marked down. SK hynix also faced uncertainty over a potential U.S. listing of its subsidiary.

U.S. chips bounced, Treasury yields rose, and doubts about AI persisted

U.S. semiconductors · Oct. 19 U.S. session: The (+1.61%) closed at 11,316.34, its first gain in nine sessions. The intraday gain reached +3.71% intraday before fading into the close. Elsewhere: Nasdaq +1.11% and Dow -0.07%. AI data-center operator CoreWeave also gave back its early gains despite a Goldman Sachs rating upgrade; its return was -0.45% (reported).Korean semiconductors · Samsung Electronics -2.98%; SK hynix -4.23%. By comparison, SK hynix’s U.S.-traded posted a return of +4.67% on Oct. 19 (reported), while the Korean shares fell today.Broker commentary · Shinhan Securities strategist Noh Dong-gil noted that Samsung Electronics and SK hynix accounted for 62.9% of the MSCI Korea Index at end-September. Renewed chip concerns could therefore magnify losses in Korean equities, and he considered the recent foreign buying too modest to signal a trend reversal (reported). Daishin Securities' Lee Kyung-min argued that unresolved credit and profitability concerns around AI made a sustained rebound difficult.Rates and oil · The U.S. 10-year Treasury yield climbed to 5.15%, up 6bp from Oct. 16's 5.09% (U.S. Treasury). French 10-year yields reached 4.9%, up 12bp amid protests and fiscal uncertainty. After Houthi attacks on Saudi oil facilities, WTI stood at $103.66 (+2.22%). Mirae Asset Securities strategist Seo Sang-young cited French political and fiscal instability and Middle East geopolitical risk as factors behind bond and oil-market volatility (reported). The rise in U.S. yields cannot reliably be assigned to any single catalyst.How to read it · A rebound in chip shares does not mean AI-financing concerns have eased. Yields rose, and CoreWeave could not hold its advance even on a day of higher semiconductor stocks—leaving the cost of financing AI investment an open concern (interpretation).

-4.23%SK hynix · In contrast to a 4.67% gain in its U.S.-traded depositary receipts

SHOW SUPPORTING EVIDENCE

Philadelphia Semiconductor Index · Oct. 19 U.S. session: open 11,466.12; high 11,550.92; low 11,293.45; close 11,316.34 (Snowshagal-collected data). It had fallen 15.7% over the preceding eight sessions, its longest consecutive decline since October 2008 (NewsPim).

U.S. stocks · S&P 500 +0.41%; Intel +2.36% (JPMorgan rating upgrade); Amazon +4.98%; VIX 18.43 (-7.80%) (NewsPim).

Trump's investment account · News1 reported at 9:50 a.m. KST on Oct. 20 that an Office of Government Ethics filing showed an account held in President Trump's name sold Micron and AMD in August and bought as much as $25m of Meta stock. Lee Kyung-min cited the report as a possible drag on AI-related investor sentiment.

200-day average · Kiwoom Securities strategist Han Ji-young put the KOSPI's 200-day moving average near 6,410, about 11% above its Oct. 19 close. MoneyToday suggested rebounds could draw selling from investors seeking to exit at breakeven. Kiwoom data put the KOSPI's forward 12-month P/E at 4.4x (MoneyToday).

Noh Dong-gil also suggested that more detailed shareholder-return plans from Samsung Electronics and SK hynix in late October could be a turning point (Special Times).

The won's strongest level in two years puts pressure on exporter earnings expectations

Foreign exchange · USD/KRW was ₩1,328.1 per dollar at 3:30 p.m., down ₩2.2. This was its lowest level since Oct. 2, 2024, and a third consecutive session setting a year-to-date low (reported). Despite roughly ₩500bn in net foreign equity selling, sustained dollar selling by exporters supported the won (reported).Exporters · Lee Kyung-min argued that USD/KRW’s slide into the ₩1,330 range had raised concern over exporters’ earnings, weighing on the group broadly (reported). Shipbuilding Top 10 -6.89%; Hyundai Motor -4.91%; Kia -3.10%. Defense · Expectations for third-quarter earnings were lowered because of the stronger won and delayed revenue recognition on export shipments, compounded by delays in new orders (Korea Economic Daily). Four major defense stocks suffered some of the session's deepest losses following Hyundai Rotem's results (see Section 06).What is established · The extent to which the exchange rate caused individual exporter losses remains a matter of broker interpretation. Food, real estate and high-dividend stocks, which are generally less directly exposed to exports, held up better on the same day.

₩1,328.1USD/KRW at 3:30 p.m. · Lowest since October 2024

SHOW SUPPORTING EVIDENCE

USD/KRW reached an intraday low of ₩1,325.4. Its Oct. 2, 2024 close was ₩1,319.3 (E Today).

KRW/JPY · ₩840.20 per ¥100 at 3:30 p.m.; an intraday level of ₩835.86 per ¥100 was the lowest since January 2008 (Sankyung Today).

Hanwha Aerospace · DS Investment & Securities projected third-quarter operating profit of ₩980.5bn, about 17% below consensus. Citing delays in recognizing revenue from export deliveries and the stronger won, it cut its price target from ₩1.83m to ₩1.65m (Financial News).

SK hynix faces a fresh dispute over a potential Solidigm listing

What happened · At an Oct. 19 National Assembly audit, Financial Supervisory Service Governor Lee Chan-jin said both the Financial Services Commission and the FSS considered the proposed listing of SK hynix’s U.S. subsidiary Solidigm to be in conflict with restrictions on . Whether the proposed offering would require a Korean securities filing was awaiting an FSC interpretation (E Today). No listing date has been confirmed.Investor concern · A separately listed subsidiary could, critics argue, lead investors to discount the value attributable to existing SK hynix shareholders. That risk was cited as a drag on SK Group shares (reported). SK Square, SK hynix’s largest shareholder, -5.00%; SK Inc., the group’s holding company, -6.45%What is established · This concerns listing structure and shareholder value—not memory demand or chip earnings. The Invest Chosun report did not definitively identify it as the cause of the selloff. SK hynix rose 0.39% in Korea on Oct. 19, when the remarks were made. How much the debate contributed to today's decline is difficult to isolate.

-5.00%SK Square · Largest shareholder in SK hynix

MONEY / 03

Institutions and Foreign Investors Sold;
Retail and Other Corporations Bought

Who was behind today's index moves

Institutions and foreign investors were both net sellers in the KRX cash market. Institutions swung from net buying on Oct. 19 to net selling of ₩1.005tn. Retail investors bought ₩898bn net, while other corporations bought ₩636.7bn, according to press reports. Foreign investors bought Samsung Electronics but sold SK hynix; institutions sold both. Retail, foreign and institutional investors were all net sellers of SK hynix.

INSTITUTIONS · KOSPI CASH · KRX DATA AT 3:38 P.M.

-₩1.005tn

From net buying of ₩575bn on Oct. 19 to net selling today. MoneyToday's 9:35 a.m. article had already shown institutions down ₩164.8bn net on the 9:12 a.m. tally.By stock · Institutions' largest net sales: Samsung Electronics ₩589bn, SK hynix ₩155.2bn, SK Square ₩57bn. Largest net purchases: Daeduck Electronics ₩29.2bn, Celltrion ₩28.6bn (Snowshagal-collected regular-session stock data, 3:51 p.m.).Foreign investors · Net flow -₩530bn. Samsung Electronics was their largest net purchase at ₩386.5bn. Their top four net sales were SK hynix ₩396.4bn, Samsung Electronics preferred shares ₩77.2bn, Samsung Electro-Mechanics ₩73.4bn and Daeduck Electronics ₩56.6bn. Their Samsung Electronics positioning contrasted with institutional selling (3:51 p.m. data). · +₩636.7bn in net purchases (MoneyToday, 3:40 p.m.), following ₩549.4bn on Oct. 19. Purchases by individual corporations were not available, so the overlap with share buybacks cannot be established.Retail investors · Net buying of ₩898bn, reversing Oct. 19's ₩1.086tn net selling. Samsung Electronics was their largest net purchase at ₩189.4bn.Futures and program trading · Foreign investors sold index futures worth ₩351bn net; institutions bought ₩215bn. Program trades showed net sales of ₩277.5bn in and net purchases of ₩47.8bn in .

NET BUYERS · KOSPIRetail · Other corporations

NET SELLERS · KOSPIInstitutions · Foreign investors

DETAILED FLOW DATA

Three investor groups · Institutions -₩1.005tn; foreigners -₩530bn; retail +₩898bn (Snowshagal's KRX KOSPI cash-market capture at 3:38 p.m., in ₩1bn increments; foreign category includes other foreign investors). Reported figures rounded to ₩100m: institutions -₩1.0048tn; foreigners -₩530bn; retail +₩898.1bn; other corporations +₩636.7bn (MoneyToday, 3:40 p.m.).
Other published tallies · Opinion News (3:49 p.m.): institutions -₩1.0052tn; foreigners -₩530.3bn; retail +₩898.9bn. Special Times (4:29 p.m.): -₩998bn; -₩542bn; +₩901bn. NewsPim (3:58 p.m.): -₩1.3143tn; -₩830.3bn; +₩1.5231tn, respectively. The direction is consistent across reports, but the amounts differ. Because reporting cutoffs and market coverage were not specified, the discrepancies cannot be definitively explained.
Cross-check · Summing Snowshagal's 3:51 p.m. stock-level data across all KOSPI and KOSDAQ names gives foreigners -₩728.3bn, institutions -₩1.109tn and retail +₩1.1952tn. These are close to the combined 3:38 p.m. market-level figures: foreigners -₩714bn, institutions -₩1.116tn and retail +₩1.192tn.
Early session · A 9:12 a.m. tally showed foreigners -₩56.3bn, institutions -₩164.8bn and retail +₩193.6bn (MoneyToday, 9:35 a.m.). These are cumulative snapshots at two different times; they do not reveal when or how much each group traded in between.
SK hynix · Retail sold ₩59.4bn net, foreigners ₩396.4bn and institutions ₩155.2bn: ₩611bn in combined net selling. That implies offsetting net purchases by other corporations and remaining investor categories, but their individual amounts are not confirmed (Snowshagal calculation). The three groups also sold ₩604.9bn combined on Oct. 19. The disclosed SK hynix buyback window runs through Nov. 19. Shares fell 4.23%; short-selling turnover of ₩100.2bn was the highest on the KOSPI.
Stock-level flows · Snowshagal's regular-session KRX investor-by-stock data at 3:51 p.m. Foreigners' second- and third-largest net purchases: SK Square ₩43.2bn and S-Oil ₩26.8bn; fifth- and sixth-largest net sales: Samsung SDI ₩40.3bn and Hanwha Systems ₩31.1bn. Institutions' third- and fourth-largest net purchases: Samsung Electronics preferred ₩20bn and KB Financial ₩18.7bn; fourth- and fifth-largest net sales: Alice ₩35.4bn and S-Oil ₩30.1bn.

ALL PROGRAM TRADES-₩229.7bn

ARBITRAGE PROGRAM TRADES+₩47.8bn

KOSPI 200 FUTURES · INSTITUTIONS+₩215bn

KOSPI 200 FUTURES · RETAIL+₩130bn

Program trading, regular-session closing figures (3:32 p.m.): arbitrage +₩47.78092bn; non-arbitrage -₩277.45570bn; total -₩229.67479bn. KOSPI 200 futures: KRX tally at 3:49 p.m., reported in ₩1bn increments.
Five-session total (Oct. 14–20) · KOSPI cash: foreign investors -₩5.031tn; institutions +₩1.388tn; retail +₩302bn. Foreign investors' KOSPI 200 futures position: +₩657bn (KRX figures, ₩1bn increments).
KOSDAQ · Institutions -₩111bn; foreign investors -₩184bn; retail +₩294bn (Snowshagal's KRX capture at 3:38 p.m.).
Short selling · Turnover in short sales of KOSPI-listed stocks totaled ₩1.1186tn, up from ₩898.7bn on Oct. 19, combining the KRX regular market and Nextrade's main market (KRX tally). Largest: SK hynix ₩100.2bn; Samsung Electronics ₩88.7bn; LG Energy Solution ₩57.2bn (28.0% of that stock's total trading value).

SECTOR / 04

Who Held Up Better—and Who Fell Hardest

A map of relative strength, not a simple ranking

IN PLAIN ENGLISHBarely more than one in ten KOSPI stocks rose, and all 24 KOSPI industry groups declined. Defense was hit hardest; every constituent in the tracked shipbuilding, battery and AI power-infrastructure theme indices also fell. Food, property and high-dividend shares—generally less exposed to exports—declined less. Semiconductor heavyweights fell roughly in line with the wider market.

STRONG

Food, Beverages & TobaccoKOSPI INDUSTRY-0.20%

REITs & InfrastructureKRX THEME INDEX-0.38%

Gaming Top 10KRX THEME INDEX-0.46%

Financial High Dividend Top 10KOSPI 200 INDEX-1.14%

Samsung Electro-MechanicsINDIVIDUAL STOCK-1.28%

WEAK

K-AI Defense Top 5+KRX THEME INDEX-9.88%

Shipbuilding Top 10KRX THEME INDEX-6.89%

Transportation Equipment & PartsKOSPI INDUSTRY-6.61%

K-AI Secondary BatteriesKRX THEME INDEX-6.19%

AI Power InfrastructureKRX THEME INDEX-5.94%

Only 13.1% of KOSPI shares advanced, down from 74.0% on Oct. 19. On the KOSDAQ, 18.1% rose.Market breadth · KOSPI: 120 gainers (including two limit-up names), 773 decliners and 24 unchanged. KOSDAQ: 315 gainers (including five limit-up), 1,350 decliners (including two limit-down) and 75 unchanged. Of 22 KOSDAQ industries, only Publishing & Media Reproduction—a group of just two stocks—rose.Defense and shipbuilding · K-AI Defense Top 5+ and Shipbuilding Top 10 each saw all ten constituents decline. Hanwha Ocean -8.26%; HD Hyundai Heavy Industries -7.96%; HD Korea Shipbuilding & Offshore Engineering -6.26%; Korea Aerospace Industries -6.26%. Only nine of the 62 traded KOSPI transportation-equipment and parts stocks advanced.Batteries · Secondary Battery Top 10 -5.50%, erasing roughly 71% of the index points (+304.12) gained on Oct. 19. LG Chem -8.35%; POSCO Future M -6.36%; Samsung SDI -6.08%; LG Energy Solution -4.17%; and on the KOSDAQ, EcoPro BM -9.15% and EcoPro -7.74%. The one-day reversal does not, by itself, establish whether Oct. 19 reports of a Chinese ESS supplier’s U.S. withdrawal were accurate.Biotech and pharmaceuticals · Biotech Top 10 -2.02% (versus +4.59% on Oct. 19); the KOSPI Pharmaceutical index -1.71% (versus +5.77% on Oct. 19); and Samsung Biologics -2.52% (after +9.94% on Oct. 19). Unlike batteries, these stocks gave back only part of Monday’s advance.Semiconductors · All 20 AI Semiconductor index constituents and all 15 Semiconductor Top 15 constituents fell. Hanmi Semiconductor -5.71%; KOSDAQ equipment maker Jusung Engineering -5.44%; Wonik IPS -4.88%; and Samsung Electro-Mechanics, which held up somewhat better, -1.28%.Market-cap losses · Samsung Electronics, its preferred shares and SK hynix together represent roughly half of KOSPI market capitalization. Their share of today's estimated market-cap decline was slightly below half (Snowshagal calculation). This was not just a selloff in chip heavyweights; the wider market fell by a comparable amount (interpretation).

Industry figures refer to KOSPI/KOSDAQ sector indices; themes to KRX thematic indices; and stock figures to individual closing-price returns. The methodologies differ, so they should not be combined into a single ranking. Today's STRONG category denotes relative resilience, not positive returns.

SECTOR DATA AND METHODOLOGY

Estimated share of market-cap losses · Samsung Electronics, Samsung Electronics preferred and SK hynix lost about ₩81tn in aggregate market value (SK hynix about ₩39.5tn; Samsung Electronics ₩38.0tn; preferred shares ₩4.0tn). Estimated KOSPI-wide loss: roughly ₩178tn, calculated by applying the index's 3.73% decline to Oct. 19 market capitalization of about ₩4,762tn. That implies approximately 46%; the three stocks accounted for about 49% of capitalization at the Oct. 19 close. This is an approximate market-cap calculation, not an official index-contribution figure.
Semiconductors · KRX AI Semiconductor -4.60% (all 20 down); Semiconductor Top 15 -4.06% (all 15 down); K-AI Semiconductor Top 2+ -3.26% (one gainer among ten); KOSPI Electrical & Electronics -3.67% (six gainers among 80); KOSDAQ Electrical & Electronics -4.20%; KOSDAQ Machinery & Equipment -4.16%.
More resilient groups · KOSPI Food, Beverages & Tobacco -0.20% (nine gainers among 45); Real Estate -0.62%; KRX Prime Office REITs -0.57%; KOSPI High Dividend 50 -1.41%. Individual stocks: Woori Financial Group +0.47%; KB Financial -1.11%; Celltrion -0.40%; KOSDAQ-listed HLB +0.12%.
KOSPI industries · Food, Beverages & Tobacco -0.20%; Real Estate -0.62%; Telecommunications -1.30%; Paper & Wood -1.53%; Entertainment & Culture -1.56%; Pharmaceuticals -1.71%; Non-metals -1.99%; Insurance -2.02%; IT Services -2.43%; Electricity & Gas -2.67%; General Services -2.76%; Financials -2.98%; Textiles & Apparel -3.00%; Distribution -3.07%; Transportation & Warehousing -3.08%; Securities -3.56% (all 29 stocks down); Electrical & Electronics -3.67%; Construction -3.75%; Manufacturing -4.00%; Machinery & Equipment -5.09%; Metals -5.96%; Chemicals -6.14%; Medical & Precision Equipment -6.43% (all eight down); Transportation Equipment & Parts -6.61%.
KOSDAQ industries · Publishing & Media Reproduction +10.56% (two stocks); Other Manufacturing -0.40%; Entertainment & Culture -0.94%; IT Services -1.21%; Food, Beverages & Tobacco -1.30%; Transportation & Warehousing -1.41%; Pharmaceuticals -1.79%; Telecommunications -2.11%; Paper & Wood -2.13%; General Services -2.47%; Distribution -2.54%; Transportation Equipment & Parts -2.59%; Textiles & Apparel -2.63%; Metals -3.43%; Manufacturing -3.62%; Chemicals -3.71%; Medical & Precision Equipment -4.10%; Machinery & Equipment -4.16%; Electrical & Electronics -4.20%; Construction -4.34%; Non-metals -4.53%; Financials -5.66%.
KRX themes · REITs & Infrastructure -0.38%; Gaming Top 10 -0.46%; Financial High Dividend Top 10 -1.14%; Biotech Top 10 -2.02%; BBIG -2.76%; KOSPI Preferred Shares -2.84%; K-AI Semiconductor Top 2+ -3.26%; Semiconductor Top 15 -4.06%; AI Semiconductor -4.60%; Electric Vehicles Top 15 -5.48% (all 15 down); Secondary Battery Top 10 -5.50% (all ten down); AI Power Infrastructure -5.94% (all 15 down); K-AI Secondary Batteries -6.19% (all ten down); Climate Change Solutions -6.43% (all 27 down); Shipbuilding Top 10 -6.89%; K-AI Defense Top 5+ -9.88%.
KOSPI top-ten stocks by market value · Samsung Electronics -2.98% (₩211,500); SK hynix -4.23% (₩1,223,000); Samsung Electronics preferred -2.93%; SK Square -5.00%; LG Energy Solution -4.17% (₩414,000); Samsung Electro-Mechanics -1.28%; Samsung Biologics -2.52%; Hyundai Motor -4.91% (₩310,000); KB Financial -1.11%; Samsung Life Insurance -3.07%.
Gainers and decliners · KOSPI: two limit-up; 118 other gainers; 24 unchanged; 773 decliners; none limit-down. KOSDAQ: five limit-up; 310 other gainers; 75 unchanged; 1,348 other decliners; two limit-down.
Share of stocks advancing · KOSPI 13.1% (120/917); KOSDAQ 18.1% (315/1,740). The numerator combines ordinary gainers and limit-up stocks. The denominator includes all advancing, unchanged and declining stocks, including price-limit moves.
KOSDAQ turnover · ₩4.9952tn, or 0.84 times the previous five-session average.
Constituent counts refer to stocks traded that day. Industry returns reflect market-cap-weighted indices, not net fund inflows by industry.

CHANGE / 05

Yesterday's Questions, Today's Answers

Checking the conditions set on Oct. 19

YESTERDAY → TODAY

01 U.S. semiconductor stocks closed higher for the first time in nine sessions, meeting our first test. But the index finished 42.92 points below the 11,359.26 threshold, failing the second. 02 The Secondary Battery Top 10 index finished -5.50% to 3,697.12, ending its rebound after one session. 03 Institutions sold ₩1.005tn of KOSPI shares net, so Monday's net buying did not extend into a second day.Only one condition—the rebound in U.S. chips—was met. Korean shares did not follow. Both the battery rally and institutional buying that helped lift the market on Oct. 19 reversed (interpretation).

PHILADELPHIA SEMICONDUCTOR INDEX · Closed higher?

-3.83%

→

+1.61%

SECONDARY BATTERY TOP 10 · Closed above 3,912.12?

3,912.12

→

3,697.12

INSTITUTIONAL KOSPI CASH FLOWS (KRX) · Still net buying?

+₩575bn

→

-₩1.005tn

01: The SOX moved from 11,137.29 on Oct. 16 to 11,316.34 on Oct. 19. The second-stage threshold of 11,359.26 represented a recovery of half the 443.93-point drop on Oct. 16. 02: All ten battery index constituents declined. 03: KRX figures captured at 3:38 p.m. Foreign investors also sold net, so the second-stage condition was not met either.

CATALYST / 06

Hyundai Rotem Misses Estimates as Defense Stocks Slide

One company event the market repriced today

HYUNDAI ROTEM · Q3 RESULTS RELEASED OCT. 19

-13.70%

Hyundai Rotem's Third-Quarter Operating Profit Falls 11% to ₩247.1bn

WHAT · THE REPORTED NUMBERS

Consolidated revenue was ₩1.6207tn (+0.1%), with operating profit of ₩247.1bn (-11%). The Defense, Robotics & Hydrogen division, which generates most of the company's profit, reported revenue of ₩841.2bn (-10.1%) and operating profit of ₩236bn (-10.5%). Rail revenue rose to ₩656.1bn (+21.4%). The stood at ₩29.142tn, down ₩1.2626tn from the end of Q2 (Aju Economy).

EXPECTATIONS · THE CONSENSUS COMPARISON

Operating profit missed market forecasts by 10.5%. Samsung Securities cut its share-price target from ₩250,000 to ₩156,000 to reflect delayed export orders and currency moves (Financial News). Shinhan Securities (₩230,000 → ₩150,000), iM Securities, SK Securities and Kiwoom Securities also cut their targets, citing delays in new overseas defense orders and lower earnings forecasts for 2027 (NewsTNT).

IMPACT · WHAT IT MEANS FOR THE BUSINESS (INTERPRETATION)

Total revenue was roughly flat year on year. An approximately ₩116bn increase in rail sales offset an estimated ₩95bn decrease in Defense, Robotics & Hydrogen sales and a decline in plant revenue (Snowshagal calculation from reported growth rates). Profitability is the pressure point: Defense, Robotics & Hydrogen, responsible for about 95% of operating profit, earned 10.5% less, while rail profit also declined. The smaller backlog adds uncertainty over when earnings can recover without confirmed new export orders, weighing on the near-term share-price outlook.

MARKET · HOW STOCKS RESPONDED

The results came during the Oct. 19 regular session, when Hyundai Rotem posted a return of +3.92%. On Oct. 20, after brokers cut price targets and earnings forecasts, it closed at ₩86,900 (-13.70%). The entire drop cannot be attributed solely to that one earnings release. Hanwha Systems -13.90%; Hanwha Aerospace -11.71%; LIG Defense & Aerospace -8.21%. The four companies shed about ₩10.2tn in combined market value from an Oct. 19 base of roughly ₩86.3tn, measured at the close (Snowshagal calculation). Foreign and institutional investors were net sellers of all four, while retail investors bought net (3:51 p.m. capture). U.S. defense stocks also weakened on Oct. 19 amid concern that defense-budget increases could face obstacles after the November midterm elections (Northrop Grumman -1.77%; Financial News).

SEE DIVISION-LEVEL FIGURES

Rail operating profit ₩5.9bn (-16.9%). Plant revenue ₩123.4bn (-13.6%), operating profit ₩5.2bn (-24.6%). End-Q3 order backlog: Rail ₩19.031tn; Defense, Robotics & Hydrogen ₩9.5228tn; Plant ₩588.2bn (Aju Economy).
The four companies' intraday market-cap decline was ₩10.5978tn, based on a Korea Economic Daily report at 2:57 p.m. The closing-basis estimate was calculated from that report's Oct. 19 market values and the companies' individual closing prices.
Related disclosures · On the morning of Oct. 19, Hyundai Rotem announced it would acquire Hyundai Wia's defense-related Special Business division for ₩358.386bn, with a planned completion date of March 31, 2027, to consolidate defense manufacturing and diversify operations. After the market close the same day, it approved buying 175,467 treasury shares (about ₩17bn) on the market for employee performance awards, with purchases scheduled Oct. 20–Nov. 20. Both announcements concern future business structure and potential flows; neither immediately offsets the quarterly profit decline or delayed new orders (interpretation).
Retail net purchases across four defense names · Hanwha Aerospace +₩48.7bn; Hanwha Systems +₩44.2bn; Hyundai Rotem +₩35bn; LIG Defense & Aerospace +₩5.7bn (3:51 p.m. capture).

NEXT / 07

What to Watch Next Session

Three tests for Wednesday, Oct. 21

Can Korea's semiconductor heavyweights recover?

Check the Oct. 21 regular-session closes. Stage 1: at least one of Samsung Electronics and SK hynix ends higher. Stage 2: both advance. Also compare the direction with U.S. semiconductor trading tonight.

Can the KOSPI hold today's 5,493.24 low?

Check the KOSPI's Oct. 21 intraday low. Stage 1: the low is at or above 5,493.24. Stage 2: it meets Stage 1 and closes higher.

Does institutional net selling ease?

Today's figure was -₩1.005tn (3:38 p.m. tally). Stage 1: institutional net selling on Oct. 21 is smaller in magnitude than ₩1.005tn, including a possible switch to net buying. Stage 2: institutions are net buyers. Use the 3:38 p.m. KRX tally for comparison.

MORE UPCOMING EVENTS

U.S. TIME10/20~22 · Nvidia GTC Berlin; Jensen Huang's keynote is scheduled for 6 p.m. KST on Oct. 21, with any Korean-market reaction falling on Oct. 22. Oct. 21, 6 a.m. KST: Bank of Korea preliminary September producer price index. Oct. 21 U.S. time: earnings from Meta, IBM, Lam Research and Texas Instruments; Tesla reports after the close, potentially affecting Korea on Oct. 22. Oct. 22: Bank of Korea Monetary Policy Board meeting. Oct. 22 U.S. time: Western Digital earnings. Oct. 23 U.S. time: preliminary U.S. October PMI. Oct. 26: planned Samsung Biologics union strike (subject to change; reported). 10/27~28U.S. Federal Reserve meeting; SK hynix's disclosed buyback window runs through Nov. 19.

Chip heavyweights fell broadly in line with the market; the worst damage was elsewhere. The next clues are whether Samsung Electronics and SK hynix regain ground on Oct. 21—and whether institutional selling abates.

SOURCES · DATA DEFINITIONS

Reference date: Oct. 20, 2026. Index, industry and individual-stock closes refer to the Korea Exchange's regular session.09:00~15:30DATA BASIS
Overseas news and indicators · Only information published before 8 p.m. KST on Oct. 20 is included.
Domestic investor flows · Snowshagal-collected KRX regular-session data (investor totals captured at 3:38 p.m.; stock-level totals at 3:51 p.m.). After-hours trading excluded.
Indices · KOSPI open 5,733.57; high 5,733.57; low 5,493.24; close 5,552.74. KOSDAQ open 805.37; high 807.22; low 773.32; close 781.97. Confirmed regular-session closing data (Snowshagal collection). For the comparison with the 213.79-point two-session rebound, see Special Times (4:29 p.m.)
Intraday chart · Follows the KOSPI regular-session five-minute chart, with the horizontal axis showing actual time. Only the open, high, low and close are exact confirmed values; the remaining intervals are approximate. The low's time is specified only to the five-minute bar (around 10:15 a.m.).
Investor totals · Snowshagal's KRX KOSPI-market capture at 3:38 p.m. (foreign total includes other foreign investors). Stock-level net purchases come from a separate KRX investor-by-stock capture at 3:51 p.m. For the other-corporations figure and amounts rounded to ₩100m, see MoneyToday (3:40 p.m.). For alternative reported totals, see Opinion News⁠·⁠, Special Times⁠·⁠ and NewsPim. For early-session flows, see MoneyToday (9:35 a.m.). The offsetting purchases in remaining SK hynix investor categories are Snowshagal calculations from stock-level flows.
Futures and program trades · KOSPI 200 futures by investor: KRX 3:49 p.m. tally. Program trading: regular-session close tally at 3:32 p.m. Five-session totals based on KRX figures.
USD/KRW · The 3:30 p.m. reading of ₩1,328.1, the intraday low and the October 2024 comparison are from E Today (4:01 p.m.). For consecutive year-to-date lows, exporter dollar sales and the KRW/JPY rate, see Sankyung Today
Trading value · KOSPI ₩15.9997tn; Oct. 19 ₩17.2174tn; 0.72 times the average of ₩22.1655tn over the preceding five sessions (Oct. 13–19). KRX tally at 3:38 p.m.
Short selling · KRX regular-session and Nextrade main-market activity combined, tallied at 3:38 p.m.
Market breadth · Confirmed KRX counts of advancing, unchanged and declining stocks. Limit-up stocks are counted separately from ordinary gainers.
Sectors and themes · KRX industry and thematic index closes and constituent counts. Individual stock returns use Snowshagal-collected closing prices. The estimated market-cap-loss share is calculated from closing prices and market values of leading KOSPI constituents.
United States · Dow, S&P 500, Nasdaq and Philadelphia Semiconductor Index are Oct. 19 U.S. closes (Snowshagal collection). The U.S. 10-year Treasury yield is from the U.S. Treasury daily yield tables. For stock performance, the consecutive semiconductor decline, CoreWeave and oil prices, see NewsPim. For SK hynix's U.S.-traded depositary receipts, see Invest Chosun. For France, the Houthis and commentary by Seo Sang-young and Noh Dong-gil, see Special Times. For the report on Trump's investment account, see News1
Broker commentary · For Lee Kyung-min, see Opinion News. For Han Ji-young, the 200-day average and the forward P/E, see MoneyToday (4:22 p.m.)
Solidigm · For the FSS governor's remarks, see E Today (Oct. 19, 1:23 p.m.). For the interpretation of pressure on SK Group shares, see Invest Chosun
Hyundai Rotem · For results and division-level figures, see Aju Economy (Oct. 19, 2:46 p.m.). For the Hyundai Wia division acquisition and treasury-stock announcement, see Digital Today (acquisition)⁠·⁠ and Digital Today (treasury shares). The Oct. 19 Hyundai Rotem close of +3.92% is from Snowshagal-collected data. For broker price-target cuts, see NewsTNT. For the consensus comparison, Samsung Securities, DS Investment & Securities and U.S. defense stocks, see Financial News (11 a.m.). For the four defense companies' Oct. 19 market capitalization, intraday losses and reduced earnings expectations, see Korea Economic Daily (2:57 p.m.)
Calendar · For U.S. earnings, the BOK rate decision and purchasing managers' indices, see Financial News (weekly outlook). For Tesla and Nvidia GTC, see TokenPost. For the keynote time, see Nvidia GTC Berlin (Oct. 21, 11 a.m.–1 p.m. Central European Summer Time). For the housing-starts release date, see U.S. Census Bureau (August release calendar). For the producer-price-index release time, see Korean economic data calendar. For the Samsung Biologics union schedule, see Hankook Ilbo. SK hynix buyback dates are taken from company disclosures.