Sept 17, 2026 Morning Briefing: KOSPI Closes Up at 6,717 as Foreign Net Selling Continues
KOSPI gained 1.37% in the prior session to close at 6,717.97, but foreign investors have recorded cumulative net selling of ~11.47T KRW over the past 5 sessions. On September 16, institutions turned net buyers with +1.23T KRW, while retail investors sold 1.21T KRW. KOSDAQ rose 0.44%, while in the US markets, NASDAQ and S&P 500 were slightly lower, Philadelphia Semiconductor rose 0.63%, and VIX ticked up to 17.71.
Benchmark Index Performance (Close as of 2026-09-16)
Domestic equities rebounded led by large-cap names, with both KOSPI and KOSDAQ closing higher. Global markets saw modest consolidation in the NASDAQ and S&P 500, while semiconductor shares sustained positive momentum.
| Index | Close | Change | % Change | Notes |
|---|---|---|---|---|
| KOSPI | 6,717.97 | +90.71 | +1.37% | Regained 6,700 level |
| KOSDAQ | 815.98 | +3.57 | +0.44% | Modest rebound |
| NASDAQ | 25,978.42 | -3.15 | -0.01% | Flat close |
| S&P 500 | 7,551.81 | -33.92 | -0.45% | Mild decline |
| Philadelphia Semiconductor | 11,246.10 | +70.56 | +0.63% | Semiconductor outperformance |
| CBOE VIX | 17.71 | +0.51 | +2.97% | Slight volatility uptick |
Source: Toss Securities public WTS snapshot (collected 2026-09-17 07:08 KST)
KOSPI Investor Flow Trends
Over the recent 5 trading sessions (09/10 to 09/16), foreign investors were net sellers each day in the KOSPI market, accumulating approximately 11.47T KRW in net outflows. On September 16, institutions shifted to net buyers with 1.23T KRW, supporting the market rebound as retail investors turned net sellers (-1.21T KRW).
| Date | Retail (100M KRW) | Foreign (100M KRW) | Institutions (100M KRW) | Flow Characteristics |
|---|---|---|---|---|
| 2026-09-10 | +3,802 | -26,217 | +5,744 | Heavy foreign selling |
| 2026-09-11 | +18,675 | -22,984 | -12,184 | Dual foreign/institutional selling, retail absorption |
| 2026-09-14 | +30,351 | -33,363 | -11,869 | Intensified foreign selling (-3.3T KRW) |
| 2026-09-15 | +8,596 | -15,458 | -9,585 | Continued foreign outflow |
| 2026-09-16 | -12,061 | -16,726 | +12,251 | Institutional buying (+1.2T KRW), retail selling |
KOSDAQ Investor Flow Trends
In KOSDAQ, daily flow fluctuations remained tighter compared to KOSPI. Following a brief net buying day by foreign investors on September 15, foreign flows turned slightly negative (-27.2B KRW) on September 16, with all three investor categories near balance.
| Date | Retail (100M KRW) | Foreign (100M KRW) | Institutions (100M KRW) | Flow Characteristics |
|---|---|---|---|---|
| 2026-09-10 | -2,698 | -11,253 | +13,996 | Substantial institutional buying |
| 2026-09-11 | +5,120 | -3,123 | -2,159 | Retail net buying |
| 2026-09-14 | +1,029 | -923 | -238 | Muted volume |
| 2026-09-15 | -1,478 | +272 | +1,149 | Foreign & institutional net buying |
| 2026-09-16 | +62 | -272 | +222 | Narrow balance across groups |
This briefing reflects publicly available market data snapshots from Toss Securities WTS and Naver Finance as of 2026-09-17 07:08 KST. It does not reflect market movements, announcements, or global macroeconomic events occurring after the snapshot. Figures are subject to exchange revisions during daily settlement. This publication is provided solely for general informational purposes and does not constitute investment advice or a recommendation to buy or sell any security. All investment decisions and risks remain solely with the reader.