Korea Market Close: Chip Rally Lifts KOSPI 3.76%
Foreign buying, a semiconductor rebound and a firmer won reinforced risk appetite, though futures positioning remained less supportive.
1. Closing view
Foreign buying in large-cap semiconductors, program inflows, won strength and broad participation all pointed to a forceful rebound. Foreign selling in index futures and wide intraday ranges nevertheless argue against declaring positioning fully stabilized.
2. Key takeaways
- The KOSPI closed at 6,598.26 (+3.76%) and the KOSDAQ at 799.59 (+2.42%) on Aug. 5.
- The KOSPI 200 gained 3.86% and the September KOSPI 200 futures contract rose 4.21%, confirming the large-cap rebound.
- Foreign investors bought a net KRW 1.4463tn of KOSPI cash equities, while KOSPI program trading posted a KRW 702.7bn net inflow.
- Advancers totaled 675 on the KOSPI and 1,346 on the KOSDAQ, aligning market breadth with index direction.
- Samsung Electronics rose 2.50%, SK hynix 5.77% and Samsung Electro-Mechanics 14.43%.
- Day-session USD/KRW fell KRW 8.0 to 1,424.5 per dollar, consistent with foreign cash-equity inflows.
- The prior U.S. SOX gain of 6.55%, lower oil and broad Asian gains formed a supportive external backdrop.
3. Indexes and market breadth
- Open
- 6,603.48
- High
- 6,674.66
- Low
- 6,540.27
- Volume
- 335,164k shares
- Turnover
- KRW 25,212,870mn
- Status
- Closed
Aug. 5, 2026, 15:30 KST; index points, thousand shares and KRW mn; KRX data via Npay, close marked final; source; checked 16:43 KST.
- Open
- 794.93
- High
- 803.49
- Low
- 783.32
- Volume
- 582,881k shares
- Turnover
- KRW 6,341,798mn
- Status
- Closed
Aug. 5, 2026, 15:30 KST; index points, thousand shares and KRW mn; KRX data via Npay, close marked final; source; checked 16:43 KST.
- Open
- 1,042.40
- High
- 1,053.19
- Low
- 1,029.11
- Volume
- 147,022k shares
- Turnover
- KRW 22,261,709mn
- Status
- Closed
Aug. 5, 2026, 15:30 KST; index points, thousand shares and KRW mn; KRX data via Npay, close marked final; source; checked 16:43 KST.
- Open
- 1,054.70
- High
- 1,055.40
- Low
- 1,031.75
- Volume
- 111,509 contracts
- Value
- KRW 29,144,936mn
- Status
- 20-min delay
Aug. 5, 2026 close; points, contracts and KRW mn; KRX data via Npay with a 20-minute delay; source; checked 16:43 KST.
| Market | Up | Unchanged | Down | Limit up | Limit down | Reading |
|---|---|---|---|---|---|---|
| KOSPI | 675 | 43 | 197 | 0 | 0 | Advancers outnumbered decliners 3.4 to 1 |
| KOSDAQ | 1,346 | 78 | 301 | 11 | 0 | Broad participation confirmed the index gain |
Common basis: Aug. 5, 2026, 15:30 KST; stock counts; KRX data via Npay KOSPI and KOSDAQ; checked 16:43 KST. Limit-up names are included in advancers and limit-down names in decliners.
KOSPI 200 breadth was also positive at 140 gainers, six unchanged and 53 decliners, showing that participation extended beyond a handful of chip names.
4. Intraday timeline and turning points
- Gap higher after the U.S. AI and semiconductor rallyThe KOSPI opened at 6,603.48 and the KOSDAQ at 794.93, roughly 3.85% and 1.82% above their prior closes.
- Upside reached 6,674.66 on the KOSPI and 803.49 on the KOSDAQSemiconductors and electronic components led. No minute-level high was assigned without a verified timestamp.
- Profit-taking coexisted with wide intraday rangesThe session lows were 6,540.27 and 783.32. Public data did not establish the exact sequence or timing of the highs and lows.
- Foreign cash and program inflows supported the marketNet foreign KOSPI buying exceeded KRW 1.4tn, while gains broadened across electronics, electrical equipment and communications equipment.
- Both benchmarks finished firmly higherThe KOSPI gained 3.76% and the KOSDAQ 2.42%. Retail demand and broad breadth kept the KOSDAQ higher despite foreign and institutional selling.
5. Foreign, institutional and retail flows
| Market | Retail | Foreign | Institutions | Reading |
|---|---|---|---|---|
| KOSPI | -11,834 | +14,463 | -2,838 | Foreign investors were the main large-cap buyers |
| KOSDAQ | +3,949 | -2,980 | -1,107 | Retail absorbed foreign and institutional selling |
| KOSPI 200 | -11,108 | +14,485 | -3,541 | Foreign demand was concentrated in large caps |
Common basis: Aug. 5, 2026, 15:30 KST; KRW 100mn; KRX data via Npay KOSPI, KOSDAQ and KOSPI 200; checked 16:43 KST. Where desktop and mobile differed by KRW 100mn, the desktop display is used.
| Category | Retail/arbitrage | Foreign/non-arbitrage | Institutions/total | Reading |
|---|---|---|---|---|
| KOSPI program | +63 | +6,964 | +7,027 | Non-arbitrage buying dominated |
| KOSDAQ program | +11 | -2,618 | -2,607 | Program flows diverged from the index gain |
| KOSPI 200 futures | +431 | -3,521 | +2,415 | Foreign cash buying conflicted with futures selling |
Common basis: Aug. 5, 2026 close; KRW 100mn; KRX data via Npay KOSPI, KOSDAQ and futures; checked 16:43 KST. The three displayed futures groups exclude other participants, so they need not sum to zero.
6. Leading and lagging sectors; key stocks
| Group | Sector | Change | Up/flat/down | Reading |
|---|---|---|---|---|
| Leader | Electronic equipment and instruments | +12.63% | 90/6/10 | Samsung Electro-Mechanics and component suppliers led |
| Leader | Electrical equipment | +9.08% | 31/1/3 | Broad strength in equipment and power names |
| Leader | Communications equipment | +8.84% | 46/6/3 | AI-infrastructure expectations moved in tandem |
| Leader | Semiconductors and equipment | +4.09% | 158/5/8 | Moved with the U.S. SOX rally |
| Laggard | Game entertainment | -3.02% | 7/4/23 | Clear underperformance in a rising market |
| Laggard | Home appliances / department stores / beverages | -1.02% to -0.94% | Mixed | Lagged technology and capital-goods sectors |
Common basis: Aug. 5, 2026 close; Npay sector taxonomy; source; checked 16:43 KST. Sector moves and headlines are treated as co-movement, not verified causality.
| Market | Stocks | Close | Change | Market relevance |
|---|---|---|---|---|
| KOSPI | Samsung Electronics / SK hynix | 246,000/1,668,000 | +2.50%/+5.77% | Large-cap chips led the rebound |
| KOSPI | Samsung Electro-Mechanics / Samsung C&T | 1,356,000/347,500 | +14.43%/+7.75% | Strength broadened to components and holding companies |
| KOSDAQ | Alteogen / Rainbow Robotics | 277,000/484,000 | +3.75%/+3.64% | Biotech and robotics supported the index |
| KOSDAQ | EcoPro / EcoPro BM | 82,300/101,700 | +0.37%/-0.78% | Battery names were mixed relative to the index |
Common basis: Aug. 5, 2026, 15:30 KST; closing prices in KRW; KRX data via Npay KOSPI and KOSDAQ; checked 16:43 KST.
Turnover: Samsung Electronics showed about KRW 5.5774tn in turnover, while leveraged and inverse ETFs also attracted heavy trading. A same-basis official ranking of all individual stocks was not obtained.
7. Corporate and policy events
Tighter single-stock leveraged ETF rules took effect
From Aug. 5, the minimum deposit for retail investors in single-stock leveraged ETFs rose to KRW 30mn from KRW 10mn. New listings are also restricted until market conditions stabilize.
Reuters reportJuly FOMC held rates at 3.50%-3.75%
The Fed kept rates unchanged on July 29; three voters preferred a 25bp increase, leaving inflation and energy-shock risks in focus.
Federal Reserve releasesU.S. AI and semiconductor stocks surged
Micron gained 7.6%, Broadcom 6.6% and Nvidia 2.6%, while the SOX closed 6.55% higher.
APNo single filing established as the cause of sector gains
A priority search of DART and company IR materials did not verify a new disclosure that directly explained the day’s sharp move in Samsung Electro-Mechanics or the broader leading groups.
DART8. Overseas operations and international market reaction
| External signal | Verified value | Status | Korean exposure | Interpretation | Source |
|---|---|---|---|---|---|
| U.S. memory and AI | MU +7.6% AVGO +6.6% NVDA +2.6% | Aug. 4 close | Samsung Electronics and SK hynix; HBM, DRAM and foundry | Global AI risk appetite moved with Korean large-cap chips | AP |
| Japanese and Taiwanese chips | Nikkei +3.7% Taiwan +2.9% | Aug. 5 close | Semiconductor equipment and electronic components | Regional technology risk-on confirmed the broader move | AP |
| Hormuz reopening hopes | Brent $79.36 | Aug. 4 close | Airlines, chemicals and transport costs; refining and shipbuilding margins | Lower oil eases costs but has mixed implications for energy names | AP |
Checked: Aug. 5, 2026, 16:43 KST. These links are business-exposure and price co-movement analysis; companies did not officially identify them as the sole cause of the day’s share-price moves.
9. USD/KRW and JPY/KRW
| Pair | Value | Change | Basis | Source | Industry implications |
|---|---|---|---|---|---|
| USD/KRW | KRW 1,424.5 | -KRW 8.0 | Aug. 5, 2026, 15:30 KST day-session close; KRW per USD | Seoul FX close report / Npay | A firmer won helps import costs and foreign return translation but can weigh on exporters’ KRW-reported revenue |
| JPY/KRW | KRW 904.05 | -KRW 3.05 | Hana Bank reference rate at 16:26 KST; KRW per JPY 100 | Hana Bank / Npay | Won strength versus yen can pressure auto and machinery pricing; it favors outbound Japan travel, with mixed tourism and duty-free effects |
Checked: Aug. 5, 2026, 16:43 KST. JPY/KRW is a direct Hana Bank reference rate, not a 15:30 Seoul-market close. No cross-rate was calculated from mismatched timestamps.
10. U.S., Asian, futures, oil and rates linkages
| Group | Indicators | Values | Change | Data basis | Korean-market linkage |
|---|---|---|---|---|---|
| U.S. equities | Dow / S&P 500 / Nasdaq / SOX | 54,085.88 7,736.52 26,584.99 12,179.26 | +1.71% +1.79% +2.59% +6.55% | Aug. 4, 2026 local closes; index points | AI and semiconductor risk appetite can transmit to Korean large caps |
| U.S. Treasuries | 2-year / 10-year | 2-year unverified 10-year 4.62% | unverified / -8bp | Aug. 4 New York session; AP for 10-year | Lower long yields ease growth-stock discount-rate pressure |
| Federal Reserve | Fed funds target | 3.50%-3.75% | Held July 29 | July 29, 2026 FOMC decision | A hold with three hike dissents caps valuation upside |
| Commodities and dollar | WTI / Brent / DXY | $75.77 $79.36 99.73 | -$4.57 -5.3% -0.05 | Aug. 4 NYMEX/international closes | Lower oil and dollar are favorable for Korean import prices and the won |
| Asia | Nikkei / Shanghai / Hang Seng | 66,300.44 3,874.40 25,951.68 | +3.7% +1.4% +0.4% | Aug. 5, 2026 closes | Regional risk-on externally confirmed Korea’s rebound |
| U.S. futures | Dow / S&P 500 / Nasdaq 100 | Synchronized quotes unverified | Unverified | Queried Aug. 5 at 16:43 KST | Not presented as closes; retained as a next-U.S.-session watchpoint |
Source mapping and check time: Npay for the Dow, S&P 500, Nasdaq and SOX; AP for the 10-year yield, Brent and Asian indexes; Federal Reserve for the FOMC; Npay market indicators for WTI and DXY. Checked Aug. 5, 2026, 16:43 KST. Reliable same-time U.S. futures quotes were not obtained.
11. Next-session watchlist
- Foreign cash versus futures: whether KRW 1.4463tn of KOSPI cash buying and KRW 352.1bn of futures selling converge.
- Semiconductor follow-through: whether Samsung Electronics and SK hynix extend gains after the next U.S. session.
- USD/KRW in the 1,420s: whether won strength continues to accompany foreign inflows.
- Breadth: whether strength spreads beyond electronics into biotech, consumption and games.
- Leveraged ETF rules: whether the higher deposit threshold reduces turnover and cash-futures basis volatility.
- Oil and Hormuz talks: whether lower crude continues to ease airline and chemical input costs.
12. Risks and data limitations
Data not verified or excluded
- Official final confirmation was not obtained for VI events, sidecars, circuit breakers, individual trading halts, block trades, short-selling spikes, margin liquidation, leveraged-product liquidation or unusual closing-auction activity. Unverified does not mean absent.
- Exact timestamps and sequencing for intraday highs, lows and turning points were not verified, so none were invented.
- JPY/KRW is the 16:26 KST Hana Bank direct reference rate, not a 15:30 Seoul-market close.
- The U.S. 2-year Treasury yield and synchronized Dow, S&P 500 and Nasdaq 100 futures quotes at 16:43 KST were not obtained.
- DART and company IR searches did not establish a single new filing as the cause of the leading stocks’ gains.
- Some Npay desktop and mobile flow displays differed by KRW 100mn; the desktop figure is used and the difference disclosed.
13. Overall assessment
Character of the move
The rebound combined global AI and chip strength, lower oil and dollar pressure, foreign large-cap buying and position rebuilding after sharp losses. It was a global, FX and flow-driven recovery rather than a move explained by one newly confirmed earnings upgrade.
Concentration versus diffusion
Samsung Electronics, SK hynix and Samsung Electro-Mechanics provided substantial index support, but breadth and strength in electrical equipment, communications equipment, construction and machinery showed meaningful diffusion.
Signal alignment
Foreign KOSPI and program buying aligned with lower USD/KRW. Foreign futures selling and foreign and institutional KOSDAQ selling prevented full alignment across markets.
Conditions for continuation or failure
Continuation requires U.S. chip resilience, stable USD/KRW, sustained foreign cash inflows and broad participation. More futures selling, renewed oil gains, won weakness or breadth narrowing to two chip stocks would damage the rebound’s quality.