10:00verdict at this hour
KOSPI Opens Down Hard, Gaps Below 6,530 as Bond Yields and Semi Selloff Converge
The KOSPI opened at 6,528.77 on Wednesday, August 19 (2026), gapping sharply lower against Tuesday’s close, as overnight pressure from U.S. Treasuries — the 30-year yield touching a 19-year high per the event calendar — and a 4.98% drop in the Philadelphia Semiconductor Index (SOX)A U.S. index tracking the equity performance of companies involved in the design, distribution, manufacture, and sale of semiconductors.Because Korean chipmakers SK hynix and Samsung Electronics move closely with SOX, an overnight SOX decline is a widely-watched leading signal for Korean semiconductor stocks at the open. semiconductor index combined with a 5.10% early-session decline in the Nikkei 225 to set the tone at the bell.By 9:52 the KOSPI had swung from an opening high of 6,528.77 to a session low of 6,400.81 at 9:17 before partially recovering to near 6,487; the KOSDAQ by contrast found footing more quickly and had climbed back above 827 by the same time, with several small-cap names in robotics and leisure posting gains against the broader tide.
10:00Snapshot
A window that records the market at that hour, like a photograph
Foreigners Net Sell ₩1.31tn on KOSPI in First Hour; Retail Steps In as Provisional Buyer
Top by trading value10— snapshot
A window on how the top trading-value names have moved up to this hour
SK hynix and Samsung Electronics Account for Over Half of KOSPI Turnover Through 9:52
Through 9:52 on Wednesday, August 19 (2026), SK hynix and Samsung Electronics together accounted for ₩14.0bn and ₩11.7bn in turnover respectively — the two names alone representing the dominant share of KOSPI activity — followed by Samsung Electro-Mechanics at ₩2.4bn and Hanwha Aerospace at ₩1.6bn.On the KOSDAQ, Ingenium Therapeutics (Reg.S) led turnover at ₩1,814bn despite closing down 1.22%, with Ananti second at ₩807bn and up 12.00%, suggesting turnover was concentrated in a pair of names moving in opposite directions.
| Stock | Prior close | Open | Opening GapThe difference between a security’s or index’s opening price on a given day and the previous session’s closing price, resulting in a price level with no trades in between.A large downward gap at the open, as seen on August 19 (2026), signals that overnight news or overseas market moves were severe enough that sellers could not wait for the open to act. | High (time) | Last at 10:00 | Change | Low (time) |
|---|---|---|---|---|---|---|---|
| SK hynix | 1,662,000 | 1,545,000 | −7.04% | 1,541,000 (09:01) | 1,535,000 (10:00) | −7.64% | 1,501,000 (09:16) |
| Samsung Electronics | 268,500 | 251,500 | −6.33% | 251,500 (09:01) | 251,500 (10:00) | −6.33% | 247,000 (09:27) |
| Samsung Electro-Mechanics | 1,440,000 | 1,357,000 | −5.76% | 1,410,000 (09:10) | 1,392,000 (10:00) | −3.33% | 1,351,000 (09:04) |
| Hanwha Aerospace | 1,146,000 | 1,255,000 | +9.51% | 1,255,000 (09:02) | 1,170,000 (10:00) | +2.09% | 1,146,000 (09:01) |
| SK Square | 1,135,000 | 1,030,000 | −9.25% | 1,020,000 (09:02) | 1,013,000 (10:00) | −10.75% | 993,000 (09:26) |
| Samsung Electronics (Pref.) | 188,300 | 176,400 | −6.32% | 176,500 (09:10) | 176,400 (10:00) | −6.32% | 172,700 (09:05) |
| SK eternix | 58,500 | 56,400 | −3.59% | 60,700 (09:10) | 58,400 (10:00) | −0.17% | 55,000 (09:16) |
| Samsung Air Conditioning | 15,110 | 15,620 | +3.38% | 16,720 (09:20) | 14,470 (10:00) | −4.24% | 14,130 (09:52) |
| Hyundai Motor | 435,000 | 416,000 | −4.37% | 417,000 (09:47) | 416,500 (10:00) | −4.25% | 406,500 (09:27) |
| Samsung SDI | 488,000 | 467,500 | −4.20% | 495,000 (10:00) | 495,000 (10:00) | +1.43% | 469,000 (09:01) |
Among KOSPI’s top names, SK hynix hit its session low of 1,501,000 won at 9:16 — some 46,000 won below the 9:00 open of 1,545,000 — before recovering; Samsung SDI, by contrast, moved in the opposite direction, posting its session high of 494,500 won at 9:31, up from a 467,500 open, illustrating the intraday dispersion within the top-turnover cohort.Hanwha Aerospace’s path was notably volatile: it opened at 1,255,000 won, immediately hit its high of 1,255,000 at the open, then slid to a low of 1,150,000 at 9:45 before recovering — a 105,000-won range within the first 45 minutes of trade.
Gainers5· Decliners5— snapshot
A window on the biggest gainers and decliners, and the reasons behind them
Semis and Financials Lead Declines; Defence and Select Small-Caps Resist
On the KOSPI, declines were broadly led by semiconductors and SK-group holdings: SK Square fell 11.28%, SK hynix 8.60%, Samsung Life 8.37%, SK 8.31%, and Samsung Electronics 7.08% (all among those with turnover above ₩100bn); in contrast, Hanwha Aerospace rose 2.53%, Hanwha Solutions 1.62%, OCI Holdings 1.47%, and Samsung SDI 1.13%.On the KOSDAQ the pattern diverged sharply: Bioneer surged 29.99%, Vivose Pharma 24.78%, Hwashin Jeonggong 16.89%, and Ananti 11.56%, while on the downside Padu fell 7.61% and Daihan Optical 4.65%; the KOSDAQ’s smaller confirmed loss of 2.04% versus KOSPI’s 6.31% reflects that smaller-cap and domestic-demand names held up relatively better, though sector-level flow data for this morning are not yet collected.