Selling centered on Samsung Electronics and SK hynix · oil-painting illustration of a row of stone pillars in a morning field, with cracks and falling stone dust on the two thick central pillars · KOSDAQ surges as large-cap semiconductors retreat · KOSPI 6,941.39 -0.89% · KOSDAQ 919.92 +2.98%
2026.10.06
Snowshagal Daily

Selling centered on
Samsung Electronics · SK hynix

KOSPI6,941.39 -0.89%
KOSDAQ919.92 +2.98%
TODAY IN ONE LINE KOSDAQ surges as large-cap semiconductors retreat
snowshagal.com
Snowshagal owl logo
SNOWSHAGAL · DAILY
MARKET RESEARCH
2026.10.06 · TUE
KRX CLOSE 15:30
DAILY MARKET NOTE / 06 OCT 2026

KOSPI opened at its high
KOSDAQ closed at its high

KOSPI -0.89%at 6,941.39 · first decline in three sessions · KOSDAQ +2.98%at 919.92, closing at the session highOpened +0.58% on strength in U.S. AI stocks, but the opening print was also the day's high · with Micron down for a second straight session and long-term yields at their highest since 2002, foreign investors concentrated selling in Samsung Electronics and SK hynixSK hynix -3.69% · Samsung Electronics -1.45% · on the KOSDAQ, Jusung Engineering +17.51% · HLB +17.18% · EcoPro BM +11.41%Foreign KOSPI cash equities -KRW 1.751tnfor a seventh straight session of net selling · on the KOSDAQ, foreign investors +KRW 109.0bn net bought · share of advancers: KOSPI 46.3% · KOSDAQ 58.4%

U.S. AI strength carried only through the open; after that, selling in the memory heavyweights set the tone for the KOSPI.
MARKET PATH / 01

The opening print of 7,044.67 was the day's high

Where the direction changed, and where the decline stopped

IN PLAIN ENGLISHU.S. AI strength drove a higher open, but the first print was the session high · the KOSPI lost 7,000 during the morning, slipped below 6,900 around 13:50, then recovered part of the decline into the close

KOSPI · 09:00~15:307,044.67 open = high → below 7,000 after 10:15 → 6,930–6,940 range around noon → low of 6,897.38 around 13:50 → close at 6,941.39
7,000 09:00 12:00 15:30
OPEN7,044.67+0.58%
LOW6,897.38-1.52%
HIGH7,044.67+0.58%
CLOSE6,941.39-0.89%
THE READ

U.S. AI gains over the holiday were priced in at the open · within the first five minutes, the index was pushed back toward 7,010The KOSPI moved around 7,000 through the morning but failed to retake it after 10:15 · at the same time, the KOSDAQ extended its gainsThe sharpest slide came between 13:35 and 13:50 · the index recovered 44 points from the low, but still closed in the bottom third of the day's range

OPEN · MORNING

+0.58% Opened +0.58%; back near 7,010 within five minutes

Opened at 7,044.67, 40.93 points above the previous close · that was also the session highSlipped toward 6,980 around 09:15, then recovered to around 7,015 between 09:25 and 09:45Below 7,000 after 10:15 · rebounds toward 6,990 around 10:30 and 10:50 did not hold

MIDDAY · AFTERNOON

Around 6,930 near lunch; session low around 13:50

Another leg lower to around 6,940 in the 11:30 hour · traded between roughly 6,930 and 6,940 through the noon hourFell about 30 points from 13:35 to 13:50 to a low of 6,897.38 · closing reports said foreign selling intensified in the afternoonRecovered to around 6,930 at 14:05 · traded around 6,920–6,935 through the 14:00 hour

CLOSE

Recovered 44 points from the low into the close

Around 6,940 near 15:00 · slipped to around 6,930 at 15:05, then returned to 6,940 around 15:15 at 6,941.39 · 44.01 points above the session lowKOSPI turnover KRW 19.1062tn · 1.05× the average of the previous five sessions

The line traces the KOSPI's 5-minute intraday chart · horizontal position reflects actual time · only four values are exact: open, high, low and close · the open was the high · the low came around 13:50 · the dotted line marks 7,000.
WHY / 02

U.S. AI strength lasted only through the open; after that came selling in the memory heavyweights

Why the KOSPI fell while the KOSDAQ rose

IN PLAIN ENGLISHDuring the holiday, U.S. AI names such as Nvidia rose, but memory bellwether Micron fell for two straight sessions and long-term yields climbed to their highest since 2002 · the KOSPI opened higher on the AI rally, then fell as foreign investors concentrated selling in Samsung Electronics and SK hynix · the KOSDAQ rose nearly 3% as semiconductor equipment, secondary batteries and biotech advanced

01

U.S. markets were not moving in one direction · AI was strong, while Micron and rates were a drag

On Oct. 5 U.S. time, Nvidia +2.12%to a record high · Broadcom +2.12% · Nasdaq at a record closing high · Philadelphia Semiconductor Index +0.27%—a much smaller gainMicron moved the other way · Oct. 2 U.S. time -2.05% · Oct. 5 -1.02%for a second straight declineThe U.S. 10-year yield rose to 5.311%, its highest since 2002 · weak September employment reduced concern about another rate hike, but pressure on long-term yields remained from inflation risks tied to high oil prices and weakness in European sovereign bonds amid French fiscal uncertainty, according to Kiwoom SecuritiesU.S. equities were pricing AI optimism, while bonds were pricing inflation and fiscal risk · the KOSPI open reflected the former; intraday flows in memory heavyweights reflected the latter more strongly (interpretation)

-1.02%Micron · Oct. 5 U.S. time
SHOW EVIDENCE
Oct. 2 U.S. time · Nasdaq +1.19% · S&P500 +0.73% · Dow +0.49% · Philadelphia Semiconductor +2.40% · reports said rate-hike concerns eased after weak September employment data
Oct. 5 U.S. time · Nasdaq +1.05% · S&P500 +0.66% · Dow +0.18% · Philadelphia Semiconductor +0.27% · Micron $1,063.96
U.S. 10-year · Oct. 1 5.237% → Oct. 2 5.277% → Oct. 5 5.311% U.S. time (CBOE 10-Year Treasury Yield Index closes) · September ISM Services 54.9 (consensus 55.0 · prior 55.4) · Prices Index 74.0 (prior 72.6), the highest since July 2022
U.S. market reports described the gains as concentrated in GPU and AI-infrastructure names, while memory stocks lagged
02

The direct force that erased the opening gain · foreign selling concentrated in two stocks

SK hynix -3.69% · Samsung Electronics -1.45% · foreign net selling: SK hynix KRW 1.4066tn · Samsung Electronics KRW 566.7bn (reports citing KRX data)Combined, the two stocks saw about KRW 1.97tn of foreign net selling, more than the KOSPI-wide foreign net selling of KRW 1.751tn · the rest of the market was net bought on aggregate · this looked more like concentrated selling in two names than a broad exit from Korean equitiesThe buying that had been providing support also weakened · purchases by —a category that includes corporate share buybacks—were KRW 272.6bn in Samsung Electronics and KRW 706.9bn in SK hynix, below their September daily averages of roughly KRW 500bn and KRW 1tn, respectively, according to reports · Samsung Electronics' buyback was nearing completionOther overhangs · Samsung Electronics was two days away from its Q3 preliminary earnings release on Oct. 8 · SK hynix faced controversy over a potential U.S. listing of subsidiary while the company said “nothing has been finalized”This was not weakness across the semiconductor complex · KRX Semiconductor Top 15 +0.55%(11 of 15 constituents rose) · KRX AI Semiconductor +2.11% · the weakness was concentrated in the two largest names

-KRW 1.9733tnCombined foreign net selling in the two stocks · reported aggregate
SHOW EVIDENCE
Calculation · SK hynix KRW 1.4066tn + Samsung Electronics KRW 566.7bn = KRW 1.9733tn · the roughly KRW 222bn gap versus total KOSPI foreign net selling of KRW 1.751tn implies aggregate net buying in the rest of the market · all figures from KRX-based tallies
Cross-check · KRX investor-by-stock data collected at 16:50, which can include some post-close trades, also showed roughly KRW 1.4tn of foreign net selling in SK hynix and around KRW 570bn in Samsung Electronics · in the same dataset, combined selling in the two names was still larger than foreign net selling across all stocks
By sector, foreign net selling in the KOSPI electrical & electronics sector—which includes Samsung Electronics and SK hynix—was KRW 1.5402tn · because that was smaller than the combined selling in the two stocks, foreigners were net buyers of other names in the sector such as Samsung Electro-Mechanics, LG Electronics and LG Innotek
The “other corporations” category includes buybacks, but not all buying by other corporations is a share buyback
Closing reports described the session as sector while large-cap semiconductors paused (Shinhan Securities)
Solidigm · intraday reports said controversy over a possible U.S. listing weighed on sentiment · the company said, “We are reviewing various options to strengthen Solidigm's competitiveness, but nothing has been finalized.”
03

Semiconductor equipment, secondary batteries and biotech lifted the KOSDAQ

Daishin Securities said semiconductor materials, components and equipment, secondary batteries, pharmaceuticals and biotech led KOSDAQ strength while large-cap semiconductors pausedJusung Engineering +17.51% · expectations for higher capex at Samsung Electronics and SK hynix were cited as a catalyst; the company made no disclosure that dayHLB +17.18% · U.S. subsidiary Elevar Therapeutics said on the morning of Oct. 6 that an FDA inspection of the finished-drug manufacturing site for liver-cancer drug rivoceranib had resulted in a “Voluntary Action Indicated (VAI)” classification on Oct. 3 · the company is preparing to resubmit the new-drug application

+2.98%KOSDAQ · closed at the session high
SHOW EVIDENCE
VAI · the inspection found issues, but the FDA classified them as not warranting official administrative or regulatory action · this was an inspection closeout classification, not a drug-approval decision
HLB said it is finalizing resubmission materials with Hengrui Pharma · no resubmission date has been disclosed
Source cited for Jusung Engineering · Shinhan Securities raised its 2026 capex estimates for Samsung Electronics and SK hynix on Oct. 1

The part of the market that erased the opening gain was the very top of the market-cap ladder. -1.19%versus KOSPI -0.89%· the share of advancers was also below half at 46.3%, but the decline was heavier at the top end of the market

MONEY / 03

Cash equities, futures and non-arbitrage program trading all leaned toward selling

Who moved the index today

IN PLAIN ENGLISHForeign investors sold more than KRW 1.7tn of KOSPI cash equities and flipped to net selling in index futures · non-arbitrage program selling also returned above KRW 1tn · the three flow measures pointed in the same direction, but they are not the same pool of money and should not be added together · foreigners bought Samsung Electro-Mechanics, Jusung Engineering and Samsung SDI, while retail investors did the opposite and bought the large-cap semiconductor names

FOREIGN · KOSPI CASH
-KRW 1.751tn

included in the foreign total · seventh straight session of net selling since Sep. 23 · widened again from -KRW 144.0bnin the previous sessionFlows pointing the same way · foreigners flipped to net selling in index futures while program selling expanded · these are separate datasets and are not added togetherRetail investors +KRW 741.0bn · institutions -KRW 2.0bn—essentially flat · other corporations +KRW 1.0122tn(based on closing reports)Stock-level rankings · top 3 foreign net buys: Samsung Electro-Mechanics, Jusung Engineering, Samsung SDI · top 3 institutional net buys: Samsung SDI, Samsung Electro-Mechanics, LG Energy Solution · retail: top 2 net buys SK hynix, Samsung Electronics; top 2 net sells Samsung Electro-Mechanics, Samsung SDI

KOSPI NET BUYERSOther corporations · retail
KOSPI NET SELLERSForeign investors · institutions roughly flat
FLOW DETAILS
Three investor groups · foreign -KRW 1.751tn · retail +KRW 741.0bn · institutions -KRW 2.0bn · KRX tally at 15:38 (KRW 1bn units) · foreign total includes “other foreign investors” · closing reports: foreign -KRW 1.7509tn · retail +KRW 740.6bn · institutions -KRW 2.0bn
Other corporations +KRW 1.0122tn · based on a 19:12 closing report · that report's foreign -KRW 1.7491tn, retail +KRW 740.5bn and institutions -KRW 1.9bn are not mixed with the three figures above because the collection times differ
Total program trading-KRW 1.2624tn
Program non-arbitrage-KRW 1.2586tn
KOSPI 200 futures · foreign-KRW 254.0bn
KOSPI 200 futures · institutions-KRW 258.0bn
Program arbitrage -KRW 3.8bn · non-arbitrage: -KRW 2.1457tn → -KRW 1.2581tn → -KRW 465.4bn → -KRW 211.2bn → -KRW 1.2586tn · sixth straight session of net selling · the three-day trend of shrinking selling stopped · KOSPI 200 futures retail +KRW 430.0bn · futures based on KRX 15:49 tally (KRW 1bn units)
Five-session total (Sep. 29–Oct. 6) · KOSPI foreign -KRW 7.398tn · institutions +KRW 67.0bn · retail -KRW 101.0bn · KOSPI 200 futures foreign -KRW 517.0bn (KRX tally · KRW 1bn units)
Versus previous session · foreign total -KRW 144.0bn → -KRW 1.751tn · institutions +KRW 381.0bn → -KRW 2.0bn · retail -KRW 1.721tn → +KRW 741.0bn · KOSDAQ foreign -KRW 173.0bn → +KRW 109.0bn · all from KRX 15:38 tally (KRW 1bn units)
KOSDAQ · foreign +KRW 109.0bn · institutions +KRW 100.0bn · retail -KRW 207.0bn (KRX 15:38 tally)
Stock-level rankings use KRX investor-by-stock flows across KOSPI and KOSDAQ · collected at 16:50, so some post-close trading may be included; rankings only, not amounts, are used · foreign net buys No. 4–5: LG Electronics, LG Innotek · foreign net sell No. 3: Leeno Industrial · institutional net buys No. 4–5: Leeno Industrial, LG Innotek
Short-selling turnover: No. 1 SK hynix KRW 377.9bn · No. 2 Samsung Electronics KRW 216.0bn · both up from KRW 261.1bn and KRW 108.3bn, respectively, in the previous session
SECTOR / 04

Where the market was strong · where it was weak

Today's distribution of strength mattered more than a league table

IN PLAIN ENGLISHSecondary batteries and electronic components were strong, with partnership and order announcements also landing at several large caps · semiconductor heavyweights, defense and shipbuilding were weak · fewer than half of KOSPI stocks rose, while nearly six in ten KOSDAQ stocks advanced

Strength in secondary batteries and electronic components; weakness in semiconductor heavyweights, defense and shipbuilding.KRX K-AI Secondary Battery +7.48%(all 10 constituents rose) · KRX Secondary Battery TOP 10 +5.75% · Samsung SDI +8.70% · EcoPro BM +11.41% · LG Energy Solution +5.12%EcoPro BM and Samsung SDI announced on the morning of Oct. 6 an MOU to jointly develop cathode materials and electrolytes for · EcoPro BM said the earliest mass-production target is 2027Electronics & components · Samsung Electro-Mechanics +5.95% · around midday on Oct. 6 disclosed a roughly KRW 290bn one-year 2027 long-term supply contract · LG Electronics +7.64% · first trading session after it announced during the holiday on Oct. 5 a long-term cooling-solutions supply agreement supporting a North American AI data-center project of more than 5GW · LG Innotek +12.20%There was no single sector-wide catalyst · order and partnership announcements at several large caps coincided with the same day's sector rotation · closing reports described the move as rotation while large-cap semiconductors pausedOf 84 stocks in the KOSPI electrical & electronics sector, 55 rose, yet the sector was -1.31% · the declines in the two largest names by market cap outweighed the breadthKRX K-AI Defense TOP5+ -2.87%(5 of 10 constituents fell) · after +4.66% in the previous session, the index reversed · KRX Shipbuilding TOP10 -1.72%(8 of 10 constituents fell) · KOSPI's worst sector was Transportation Equipment & Components -1.43%Share of advancers: KOSPI 46.3% · KOSDAQ 58.4%

STRONG

K-AI Secondary BatteryKRX theme index+7.48%
KOSDAQ TOP 10KRX theme index+7.21%
Samsung Electro-MechanicsStock+5.95%
Samsung SDIStock+8.70%

WEAK

K-AI Defense TOP5+KRX theme index-2.87%
Shipbuilding TOP10KRX theme index-1.72%
Transportation Equipment & ComponentsKOSPI sector-1.43%
SK hynixStock-3.69%

Sector figures use KOSPI/KOSDAQ industry indices · theme figures use KRX theme indices · stock figures are individual closing-price changes · methodologies differ, so they are not ranked on one common scale

SECTOR EVIDENCE
Versus previous session · K-AI Secondary Battery +3.38% → +7.48% · K-AI Defense TOP5+ +4.66% → -2.87% · Semiconductor Top 15 -0.81% → +0.55% · K-AI Biotech KOSDAQ -3.04% → +3.06% · KOSPI Chemicals +3.32% → +1.59%
KOSPI sectors · Medical & Precision Instruments +6.53% (5 of 8 constituents rose) · Chemicals +1.59% · Machinery & Equipment +0.82% · Electrical & Electronics -1.31% · Manufacturing -1.09% · Pharmaceuticals -1.09% · Transportation Equipment & Components -1.43%
KOSDAQ sectors · Pharmaceuticals +4.62% · Financials +4.49% · Machinery & Equipment +3.90% · Electrical & Electronics +3.28% · Publishing & Media Reproduction -1.38% · Textiles & Apparel -0.75%
Themes · KOSDAQ 150 Governance +6.08% · KRX Electric Vehicle Top 15 +3.94% · KRX Technology Transfer Bio +2.26% · KRX Game TOP 10 -2.61% · KRX Blue Chip 25 -1.78%
Top 10 by market cap · Samsung Electronics -1.45% (KRW 272,000) · SK hynix -3.69% (KRW 1,773,000) · Samsung Electronics preferred -1.39% · SK Square +0.09% · Samsung Electro-Mechanics +5.95% · LG Energy Solution +5.12% · Hyundai Motor +0.43% · Samsung Biologics -3.25% · KB Financial -0.30% · Samsung Life -1.38%
Advancers/decliners · KOSPI limit-up 0 · up 425 · unchanged 32 · down 461 · limit-down 0 · KOSDAQ limit-up 6 · up 1,012 · unchanged 81 · down 645 · limit-down 0
Share of advancers · KOSPI 46.3% (425/918) · KOSDAQ 58.4% (1,018/1,744) · numerator = advancers + limit-up stocks; denominator = limit-up + up + unchanged + down + limit-down
KOSDAQ turnover KRW 8.6627tn · 1.16× the average of the previous five sessions
Sector returns are market-cap-weighted index changes, not net inflow amounts · a single day's move is not enough to conclude that money rotated into or out of a sector
CHANGE / 05

Answers to the questions from the previous session

Checking yesterday's conditions against today's close

IN PLAIN ENGLISHThe KOSPI closed below 7,000 · the two refiners diverged, with S-OIL down and SK Innovation up · foreign cash-equity net selling actually increased

LAST SESSION → TODAY

The KOSPI opened above 7,000 but closed below it · foreign cash selling extended to a seventh session and widened again

01
KOSPI close · above 7,000
7,003.74
→
6,941.39
02
S-OIL · SK Innovation closing returns
+11.69% · +10.32%
→
-0.54% · +2.60%
03
Foreign KOSPI cash net buying/selling
-KRW 144.0bn
→
-KRW 1.751tn
NEXT / 06

What to watch next session

Three checks to score at the Oct. 7 close
Does foreign net selling in KOSPI cash equities extend to an eighth session?

Today: -KRW 1.751tn · score by the sign of total foreign cash flow, including “other foreign investors”

Does the concentrated foreign selling in Samsung Electronics and SK hynix ease?

Today the two stocks saw about KRW 1.97tn of combined foreign net selling · score whether the KRX stock-level total for the two falls below that amount

Can the KOSDAQ rise for a second straight session?

Today: +2.98%, closing at the session high of 919.92 · score at the close whether strength outside semiconductors continues

Foreign selling on the KOSPI reached a seventh session · on the KOSDAQ, foreign investors and institutions were both net buyers.

Full index, FX, rates and commodities data are in MARKETThe Daily keeps only the numbers needed to explain today's session.
MARKET ↗
SOURCES · DATA BASIS
Reference date: Oct. 6, 2026 · index, sector and individual-stock closes use the KRX regular session, 09:00–15:30
Overseas news and economic indicators reflected through 20:00 KST on Oct. 6
Domestic flows · KRX regular-session tally as of 15:38 · after-market flows are excluded
Indices · KOSPI open 7,044.67 · high 7,044.67 · low 6,897.38 · close 6,941.39 · KOSDAQ open 902.16 · high 919.92 · low 901.46 · close 919.92 · final regular-session values from internal collection · KOSPI open and low match Wikitree closing report
Intraday chart · path read from the KOSPI regular-session 5-minute chart, with horizontal position representing actual time · only the four OHLC values are stated as exact numbers; intermediate levels are given as ranges · the explanation of heavier foreign selling in the afternoon is based on the Block Media closing report
Investor-group totals · KRX tally as of 15:38 · closing-report figures cite Block Media · other corporations +KRW 1.0122tn from the Korea Report closing report(19:12)
Foreign net selling in the two stocks and other-corporation buying · the note that the share buyback was nearing completion is from Newsis(citing KRX data · 15:41) · the same figures and foreign net selling in the electrical & electronics sector are from Korea Report · magnitude cross-check uses KRX investor-by-stock data collected at 16:50
Futures & program trading · KRX KOSPI 200 futures investor tally as of 15:49 · regular-session program-trading close tally · five-session totals use KRX data
Stock-level rankings · KRX investor-by-stock flows collected at 16:50 · rankings only
Turnover · KOSPI KRW 19.1062tn · 1.05× the five-session average of KRW 18.1119tn · 15:38 tally
Short selling · stock-level short-selling turnover from the regular session as of 15:38, combining KRX and Nextrade
Market breadth · KRX counts of advancing/declining issues collected at 16:05 · limit-up stocks are counted separately from ordinary advancers
Sectors & themes · KRX industry-index and theme-index closing returns and constituent advance/decline counts · S-OIL and SK Innovation closing returns from Jaekyung Ilbo · Jaekyung Ilbo · Samsung SDI, LG Innotek and LG Electronics closing returns from Block Media · Jusung Engineering, HLB and EcoPro BM closing returns, and commentary from Shinhan Securities and Daishin Securities, from the NewsPim closing report
Secondary batteries & electronic components · EcoPro BM–Samsung SDI solid-state battery MOU from MoneyToday · Samsung Electro-Mechanics MLCC long-term supply contract from Asia Business Daily(12:05) · Korea Economic Daily · LG Electronics cooling-solutions contract from LG Electronics announcement · Newsis(Oct. 5)
Semiconductors · Solidigm listing controversy and the company's response from Global Economic · background for Jusung Engineering from Namdo News
HLB · inspection result, notification date and resubmission preparations from MoneyToday · E-Today reports
Overseas · Nasdaq, S&P 500, Dow, Philadelphia Semiconductor Index and U.S. 10-year yield (CBOE 10-Year Treasury Yield Index) use Oct. 2 and Oct. 5 U.S.-time closes · record-closing-high and highest-yield-since-2002 descriptions from Dailian · Oct. 5 moves in Nvidia, Broadcom and Micron, plus the interpretation of memory-sector weakness, from TopStarNews · Micron close · Micron Oct. 2 return from Wall Street Journal · Investing.com daily prices · explanation of long-term yield pressure from the NewsPim Morning Report(Kiwoom Securities) · September ISM Services data from the ISM press release(Oct. 5, 10:00 U.S. time)
Schedule · Samsung Electronics preliminary earnings and FOMC minutes from NewsPim · Q3 operating-profit consensus and downward revision from the NewsPim Morning Report(Kiwoom Securities)
www.snowshagal.comfor previous issues.