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Weekly wrap · Week of Oct 6 – Oct 8, 2026 · 3 trading days

KOSPI falls 5.4% in three sessions as foreign selling hits chipmakers; defense slides, batteries rise

KOSPI−5.4%KOSDAQ−0.1%KOSPI 200−5.8%

KOSPI fell 5.4% to 6,625.93 over the three sessions. Samsung Electronics' preliminary Q3 results showed revenue of 195 trillion won and operating profit of 107.4 trillion won, its first quarter above 100 trillion won and above consensus. Even so, foreign and institutional investors sold, and Samsung Electronics ended the week down 5.1% and SK hynix down 8.7%. Sources cited oil prices, higher US yields and foreign outflows; one broker said Samsung's share buyback was nearing its end, shrinking net buying by other corporations.

Defense and space shares dropped on profit-taking after a strong run. Hanwha Aerospace fell 16.9%, LIG Defense & Aerospace 19.2% and Poongsan 17.8%. The pullback extended to shipbuilders such as Hanwha Engine (-15.5%) and HD Korea Shipbuilding & Offshore Engineering (-10.6%). Elsewhere, Peptron fell 29.3% after its Eli Lilly platform evaluation ended without a follow-on commercial deal, while LG Energy Solution (+8.1%) and Samsung SDI (+7.6%) rose against the market.

Why the market moved

Foreign selling of large chip stocks, higher oil and US yields, and AI-spending concerns weighed on KOSPI despite Samsung's record Q3 profit.12345

Top themes

EV batteries

LG Energy Solution preliminary earnings1

Semiconductor equipment

Memory capex expansion by Samsung, SK hynix1

The big stories

Samsung posts record Q3 profit, but KOSPI sinks 5.4% on foreign selling

Samsung Electronics' preliminary Q3 results showed record revenue of 195 trillion won and operating profit of 107.4 trillion won, its first quarter above 100 trillion won, yet foreign and institutional investors sold heavily. KOSPI closed down 5.40% and KOSDAQ 0.12%, with Samsung Electronics down 5.08% and SK hynix down 8.69%.12345678910

Directly affected

Next in line

Further out

Defense and space stocks drop after rally; Hanwha Aerospace down 16.9%

Defense and space shares fell as investors took profits after a strong run, with the space and defense theme index down 3.74% in a session. Hanwha Aerospace closed down 16.88%, LIG Defense & Aerospace fell 19.16%, and Korea Aerospace-linked names also weakened.1234567

Directly affected

Next in line

Peptron plunges 29% after Lilly deal ends without commercialization

Peptron closed down 29.34% after its long-acting drug delivery platform technology evaluation with Eli Lilly ended without a follow-on commercial deal. Hanmi Pharmaceutical, which had just won approval for a domestic GLP-1 obesity drug, also fell on profit-taking.1234

Directly affected

Next in line

LG Energy Solution and Samsung SDI rally against the market

LG Energy Solution released preliminary consolidated earnings and closed up 8.09%, while Samsung SDI rose 7.57%. Battery stocks outperformed as the broader market fell sharply.12

Directly affected

Further out

Hyundai Motor falls 6.4% as earnings slump outlook weighs

Hyundai Motor closed down 6.35% after brokers said the depth of its earnings slump would determine the pace of any rebound. Heungkuk Securities argued the bad news had passed and better deliveries were ahead.12

Directly affected

Further out

The market

KOSPI fell 5.4% to 6,625.93 and KOSPI 200 fell 5.8% to 1,044.52. KOSDAQ was down 0.1% at 892.27. Decliners numbered 1,656 against 871 advancers, with 239 unchanged. Trading value was about ₩32.4 trillion against an average of about ₩29.2 trillion. Foreign investors net sold ₩6.5 trillion on KOSPI and ₩48.8 billion on KOSDAQ. The won strengthened 1.5% to 1,339.2 per dollar. The KTB 3-year yield was 3.983%, up 4.6 bp, and the US 10-year was 5.22%, down 9.0 bp. Brent rose 3.9% to $104.28. The S&P 500 slipped 0.1%, the Nasdaq 100 ETF fell 1.1% and the US chip ETF (SOXX) fell 4.4%. The Nikkei 225 fell 1.3%.

KOSPIDaily closes · shaded: this wrap6,625.93
6,0007,0008,000
Jun 29Jul 31Sep 2Oct 8
KOSDAQDaily closes · shaded: this wrap892.27
700800900
Jun 29Jul 31Sep 2Oct 8

871 stocks rose, 1,656 fell · trading value ₩32T

USD/KRW1,339.2−1.5%
KTB 3y3.98+5bp
UST 10y5.22-9bp
S&P 5007,765.36−0.1%
Nasdaq 100 (QQQ ETF)−1.1%
US chips (SOXX ETF)−4.4%
Nikkei 22569,042.11−1.3%
Brent oil104.28+3.9%
Gold4,1570.0%
Copper (CPER ETF)−1.0%

Themes investors follow

K-defense fell 10.0% and space and aerospace 10.1%, led by LIG Defense & Aerospace, Poongsan and Hanwha Aerospace. Shipbuilding fell 7.1%. Power grid and cables fell 5.5%, with Taihan Cable & Solution down 10.8% and Gaon Cable down 10.2%. Robotics fell 4.7%, with Bigwave Robotics down 24.6%. AI power and transformers fell 2.3%; HD Hyundai Electric lost 10.6%. HBM and AI chips fell 1.6%. On the upside, EV batteries rose 2.4%, led by Shin Heung Energy & Electronics (+11.1%), LG Chem (+9.1%) and LG Energy Solution (+8.1%). Semiconductor equipment and materials rose 1.5%, with Kctech up 34.8%; sources cited memory capex expansion. Biotech rose 1.5%, with HLB-group names strong, though no clear reason was reported for those moves.

Popular themes

Best themes

Worst themes

  • Space & aerospace−10.1%Nara Space Technology −17.0% · Hanwha Aerospace −16.9% · Satrec Initiative −16.1%
  • K-defense−10.0%LIG Defense&Aerospace −19.2% · Poongsan −17.8% · Hanwha Aerospace −16.9%
  • Shipbuilding−7.1%Hanwha Engine −15.5% · HD-Hyundai Marine Engine −12.8% · HD Korea Shipbuilding & Offshore Engineering −10.6%
  • Self-driving−5.9%Hyundai Mobis −6.4% · HL Mando −5.7% · Nextchip −5.7%
  • Crypto & digital assets−5.8%Parataxis Ethereum −9.2% · GalaxiaMoneytree −6.6% · Satoshi Holdings −1.7%
  • Power grid & cables−5.5%Taihan Cable & Solution −10.8% · Gaon Cable −10.2% · Dawon Cable −6.0%

The biggest companies

Samsung Electronics fell 5.1% (market value about ₩1,531.7 trillion) and SK hynix fell 8.7% (about ₩1,228.0 trillion). SK Square fell 9.5% and Samsung Electro-Mechanics 2.2%. LG Energy Solution rose 8.1% after preliminary earnings. Hyundai Motor fell 6.4%; brokers said the depth of its earnings slump would determine the pace of a rebound. KB Financial fell 2.7%, Samsung Biologics 10.0%, Samsung Life Insurance 6.9%, Samsung C&T 8.2%, Doosan Enerbility 3.8%, Shinhan Financial 5.1%, Hanwha Aerospace 16.9% and Celltrion 1.7%. Samsung SDI rose 7.6%.

Who was buying and selling

Foreign investors were heavy net sellers of SK hynix (about ₩3.65 trillion), Samsung Electronics (about ₩945.3 billion) and SK Square (about ₩423.5 billion). They bought Jusung Engineering (about ₩176.8 billion, +12.9%), Isupetasys, Samsung SDI (+7.6%) and LG Energy Solution. Institutions sold Samsung Electronics (about ₩1.35 trillion) and SK hynix, and bought SK Square, Samsung SDI and SK Innovation. Retail investors bought SK hynix (about ₩2.04 trillion) and Samsung Electronics (about ₩1.99 trillion), plus Hyosung Heavy Industries and Hanwha Aerospace, and sold Samsung SDI and LG Energy Solution.

Foreign investors

Net bought

  1. 1Jusung Engineering+₩177B+12.9%
  2. 2Isupetasys+₩100B+3.5%
  3. 3Samsung SDI+₩93B+7.6%
  4. 4DB HiTek+₩64B−1.4%
  5. 5EO Technics+₩60B−1.5%
  6. 6LG Energy Solution+₩58B+8.1%
  7. 7Simmtech+₩52B+3.4%
  8. 8HD Korea Shipbuilding & Offshore Engineering+₩51B−10.6%
  9. 9Koh Young Technology+₩44B+10.0%
  10. 10APR+₩38B+1.5%
  11. 11Korean Air Lines+₩36B+0.3%
  12. 12Hana Micron+₩35B−0.6%
  13. 13Wonik IPS+₩30B−3.3%
  14. 14Samsung C&T+₩28B−8.2%
  15. 15HD Hyundai Heavy Industries+₩27B−9.9%

Net sold

  1. 1SK hynix−₩3.7T−8.7%
  2. 2Samsung Electronics−₩945B−5.1%
  3. 3SK Square−₩423B−9.5%
  4. 4Hyosung Heavy Industries−₩250B−10.4%
  5. 5LG Electronics−₩168B−7.2%
  6. 6Doosan Enerbility−₩156B−3.8%
  7. 7LIG Defense&Aerospace−₩125B−19.2%
  8. 8Hyundai Motor−₩98B−6.4%
  9. 9Samsung Biologics−₩95B−10.0%
  10. 10Hanwha Aerospace−₩94B−16.9%
  11. 11NAVER−₩93B−4.4%
  12. 12Taihan Cable & Solution−₩79B−10.8%
  13. 13Leeno Industrial−₩78B+4.3%
  14. 14HD Hyundai Electric−₩71B−10.6%
  15. 15Hanwha Systems−₩69B−7.6%

Institutions

Net bought

  1. 1SK Square+₩240B−9.5%
  2. 2Samsung SDI+₩137B+7.6%
  3. 3SK Innovation+₩111B+4.5%
  4. 4LG Energy Solution+₩84B+8.1%
  5. 5Leeno Industrial+₩71B+4.3%
  6. 6LG Innotek+₩68B−0.3%
  7. 7Doosan+₩57B+0.1%
  8. 8LG Chem+₩40B+9.1%
  9. 9Hanwha Systems+₩35B−7.6%
  10. 10S-Oil+₩32B+1.5%
  11. 11LG Electronics+₩30B−7.2%
  12. 12Daeduck Electronics+₩30B+6.7%
  13. 13Kctech+₩27B+34.8%
  14. 14Lotte Energy Materials+₩27B+8.7%
  15. 15OliX Pharmaceuticals+₩27B+0.4%

Net sold

  1. 1Samsung Electronics−₩1.4T−5.1%
  2. 2SK hynix−₩493B−8.7%
  3. 3Samsung Electro-Mechanics−₩165B−2.2%
  4. 4Hanwha Aerospace−₩127B−16.9%
  5. 5Hyundai Motor−₩91B−6.4%
  6. 6Isupetasys−₩79B+3.5%
  7. 7DB HiTek−₩78B−1.4%
  8. 8Samsung Electronics Pref.−₩78B−3.5%
  9. 9HD Hyundai Heavy Industries−₩76B−9.9%
  10. 10KIA−₩75B−5.4%
  11. 11HD Korea Shipbuilding & Offshore Engineering−₩71B−10.6%
  12. 12Wonik IPS−₩65B−3.3%
  13. 13Hyosung Heavy Industries−₩57B−10.4%
  14. 14Simmtech−₩56B+3.4%
  15. 15LS−₩53B−10.4%

Retail investors

Net bought

  1. 1SK hynix+₩2T−8.7%
  2. 2Samsung Electronics+₩2T−5.1%
  3. 3Hyosung Heavy Industries+₩305B−10.4%
  4. 4Hanwha Aerospace+₩219B−16.9%
  5. 5SK Square+₩188B−9.5%
  6. 6Hyundai Motor+₩185B−6.4%
  7. 7Samsung Electro-Mechanics+₩159B−2.2%
  8. 8Doosan Enerbility+₩146B−3.8%
  9. 9LG Electronics+₩131B−7.2%
  10. 10LIG Defense&Aerospace+₩127B−19.2%
  11. 11NAVER+₩125B−4.4%
  12. 12Samsung Electronics Pref.+₩117B−3.5%
  13. 13Samsung Biologics+₩110B−10.0%
  14. 14HD Hyundai Electric+₩107B−10.6%
  15. 15Taihan Cable & Solution+₩87B−10.8%

Net sold

  1. 1Samsung SDI−₩231B+7.6%
  2. 2LG Energy Solution−₩138B+8.1%
  3. 3Jusung Engineering−₩120B+12.9%
  4. 4SK Innovation−₩99B+4.5%
  5. 5APR−₩49B+1.5%
  6. 6LG Chem−₩40B+9.1%
  7. 7Kctech−₩35B+34.8%
  8. 8LG Innotek−₩34B−0.3%
  9. 9Koh Young Technology−₩33B+10.0%
  10. 10Hanwha Solutions−₩32B−0.3%
  11. 11Daeduck Electronics−₩28B+6.7%
  12. 12Ecopro−₩26B+3.4%
  13. 13HYBE−₩22B+5.5%
  14. 14Isupetasys−₩20B+3.5%
  15. 15Sama Aluminium−₩18B+19.5%

ETFs

Battery ETFs led: KODEX Solid-State Battery ESS TOP2 Plus rose 7.6%, SOL All-Solid-State Battery & Silicon Anode 7.1% and TIGER Secondary Battery TOP 10 6.6%. KODEX US AI Optical Communication Network rose 5.8% and SOL US Nuclear SMR 5.2%. Defense ETFs were weakest: KODEX Defense TOP10 fell 13.1%, SOL K Defense 12.6% and TIGER K Defense & Space 12.6%. Shipbuilding ETFs fell about 8%, and AI power equipment and nuclear ETFs fell 7% to 8%. Money moved toward batteries and away from defense, shipbuilding and power.

Best ETFs

Worst ETFs

Leveraged and inverse ETFs are left out; moves are the daily moves compounded.

How our signals did

No Squeeze! setups were active this week. Of 40 technical events, 11 worked. Almac's 200-day moving average reclaim returned 39.9% and SK Gas's golden cross 5.2%. Kctech's 52-week high signal returned -25.5%, Ecopro's breakout -19.1% and Jntc's golden cross -26.0%. No pair trades were stretched. Short squeeze scores were 60 for Meritz Financial Group, Hanssem and ISU Specialty Chemical, 58 for SM Entertainment and KMW.

Notable technical signals

40 notable signals: 11 moved the way they pointed so far.

Highest short squeeze scores

Signals describe past prices. Results run from the signal to the latest close; they are not recommendations.

Written by AI from JONBUR's data and checked against those figures. Index and stock moves are the daily moves compounded over the period. Reasons come only from the linked daily wraps, news, filings and broker reports; when none gives a reason, we say so. Not financial advice.

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