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Both indices fell hard — KOSPI is climbing back, while KOSDAQ’s open was its high — Korea Market Midday, Aug 31, 2026

As of 11:45, KOSPI stood at -1.93% and KOSDAQ at -3.01%. Both are sharply lower on the day.The shape of the morning differs, though — KOSPI opened at 6,613.58, fell to a low of 6,547.76 and has climbed back to around 6,657.96, above its opening level.KOSDAQ’s open of 821.67 was also its high for the

The Silmari
A daily data newsletter on the Korean stock market — silmari, ‘a clue: the loose end that unravels the knot’
③ Midday 12:002026.08.31 Mon · No. 28Caution — both indices are sharply lower and Japan closed its morning session at -1.16%. KOSPI has climbed back from its morning low while KOSDAQ has not. The sentiment gauge reads 0.344, within the neutral band. These are intraday figures, not settled.
③ Midday · published 12:00 KST · session in progress
01 · VerdictRegular session confirmed 15:30 KST

12:00verdict at this hour

Both indices fell hard — KOSPI is climbing back, while KOSDAQ’s open was its high

As of 11:45, KOSPI stood at -1.93% and KOSDAQ at -3.01%. Both are sharply lower on the day.The shape of the morning differs, though — KOSPI opened at 6,613.58, fell to a low of 6,547.76 and has climbed back to around 6,657.96, above its opening level.KOSDAQ’s open of 821.67 was also its high for the day; it set a low of 805.14 and sits near 813.19. The moment it opened was its highest.These are intraday figures, not settled, and the two sources differ slightly.

Key points
01KOSPI has climbed back from its morning low — open 6,613.58, low 6,547.76, high 6,712.25 and 6,657.96 as of 11:45. The current level sits above the open.
02KOSDAQ’s open was its high — the open of 821.67 and the high of 821.67 are the same figure, against a low of 805.14. Unlike KOSPI it has not recovered ground since opening.
03The large caps set their lows early in the 9 a.m. hour — SK hynix reached a low of -4.6% at 09:06, Samsung Electronics -4.28% at the same time and Samsung Electro-Mechanics -6.33%. All three now sit above those levels.
04Some names are sharply higher while the indices fall — on KOSPI, Kumho Electric at +17.6% and SK Innovation at +7.7%; on KOSDAQ, Onconic Therapeutics at +17.81% and JW Shinyak at +13.57%.
05Institutions lead the selling — on KOSPI, institutions sold a net -KRW 701.0bn, investment firms -KRW 627.9bn and foreign investors -KRW 557.0bn, while retail bought +KRW 549.7bn. These come from the 11:46 compilation via the fallback route.
02 · SnapshotUntil 12:00 · Korea Investment & Securities Index 5-min (High/Low based on 5-min close)(May vary slightly from exchange official figures)

12:00Snapshot

A window that records the market at that hour, like a photograph

KOSPI -1.93%, KOSDAQ -3.01% — a morning that split at the early low

KOSPI at 12:00Open6,613.58· High6,701.04(09:30) · Low6,562.67(09:00) · as of 12:006,685.61
KOSDAQ at 12:00Open821.67· High820.47(09:30) · Low806.04(09:00) · as of 12:00818.39
03 · Top 10 checkpointsKorea Investment & Securities 5-min bar · Until 12:00

Top by trading value10— snapshot

A window on how the top trading-value names have moved up to this hour

SK hynix at KRW 2,321.1 bn and Samsung Electronics at KRW 1,811.7 bn lead the morning’s turnover

As of 11:45, the largest KOSPI turnover was SK hynix at KRW 2,321.1 bn, followed by Samsung Electronics at KRW 1,811.7 bn, Samsung Electro-Mechanics (KRW 339.3 bn), Samsung SDI (KRW 231.7 bn) and Kumho Electric (KRW 213.1 bn).On KOSDAQ, Alteogen traded the most at KRW 113.5 bn, ahead of JW Shinyak (KRW 65.7 bn), Onconic Therapeutics (KRW 57.2 bn) and Jusung Engineering (KRW 55.8 bn).That the two names carrying the heaviest turnover are both lower, with sharply higher names mixed in behind them, is the shape of this morning.

Top 10 by Trading Value — Prior Close · Open · Gap · Values as of 12:00 (may differ slightly from exchange official figures)
StockPrior closeOpenGapHigh (time)12:00 Current PriceChangeLow (time)
SK hynix1,653,0001,596,000−3.45%1,635,000 (09:32)1,621,000 (12:00)−1.94%1,577,000 (09:06)
Samsung Electronics257,000249,000−3.11%253,000 (09:32)252,500 (12:00)−1.75%246,000 (09:06)
Samsung Electro-Mechanics1,421,0001,370,000−3.59%1,413,000 (09:42)1,392,000 (12:00)−2.04%1,331,000 (09:06)
Samsung SDI571,000568,000−0.53%592,000 (09:21)573,000 (12:00)+0.35%557,000 (09:02)
Samsung Electronics (Pref.)186,800180,900−3.16%184,100 (09:33)183,600 (12:00)−1.71%179,200 (09:08)
Kumho Electric10,68011,090+3.84%13,180 (09:49)12,640 (12:00)+18.35%10,770 (09:03)
SK Square1,028,000993,000−3.40%1,021,000 (12:00)1,018,000 (12:00)−0.97%975,000 (09:06)
Kumho E&C17,02017,060+0.24%18,100 (09:49)17,060 (12:00)+0.24%16,610 (09:03)
Doosan Enerbility88,20086,400−2.04%85,200 (09:01)82,600 (12:00)−6.35%81,700 (10:58)
SK Innovation116,900119,300+2.05%126,400 (11:44)125,400 (12:00)+7.27%116,700 (09:03)

The timing divides the paths — the KOSPI large caps set their lows around 09:06 and their highs around 09:32. SK hynix ran from a low of -4.6% to a high of -1.09%, Samsung Electronics from -4.28% to -1.56%.The sharply higher names peaked later — Kumho Electric at 09:49, Onconic Therapeutics at 10:46, JW Shinyak at 10:13 and SK Innovation at 11:44.Doosan Enerbility’s open of -2.04% was also its high, and it set a low of -7.37% at 10:58 — alone in the list in falling through the whole morning.KOSDAQ investor flows were not received today either — the fallback route covers KOSPI only.

04 · Up · DownReason labels: [News] confirmed · [Pattern] inferred

Gainers5· Decliners5— snapshot

A window on the biggest gainers and decliners, and the reasons behind them

From Kumho Electric at +17.6% to Doosan Enerbility at -6.58% within the turnover list

The large semiconductor names sit lower together at the top of the KOSPI turnover list — SK hynix -2.3%, Samsung Electronics -2.33%, Samsung Electro-Mechanics -2.39% and Samsung Electronics preferred -2.09%.At the other end are Kumho Electric at +17.6% and SK Innovation at +7.7%. Kumho Electric opened at +3.84% and reached a high of +23.41% at 09:49, while SK Innovation set its high of +8.13% at 11:44, climbing into late morning.The largest decline is Doosan Enerbility at -6.58%, which set its low of -7.37% at 10:58 — a floor made late in the morning rather than at the open.On KOSDAQ, Onconic Therapeutics +17.81%, JW Shinyak +13.57% and KBI Metal +2.96% rose, while Alteogen -6.41%, Taihan Fiberoptics -4.19% and HPSP -3.33% fell.Why these names moved as they did could not be confirmed from the data available today — the unconfirmed-catalyst marker remains in place, and no cause is invented to fill it.

Gainers —12:00as measured at this hour
Sunny Electronics+25.45%· turnover ₩29.4bn
MNC Solution+23.30%· turnover ₩17.0bn
Onconic Therapeutics (KOSDAQ)+21.67%· turnover ₩67.5bn
Kumho Electric+17.13%· turnover ₩218.7bn
Wonik (KOSDAQ)+15.97%· turnover ₩41.4bn
Losers —12:00as measured at this hour
HanAll Biopharma−8.82%· turnover ₩15.5bn
Wooree Investment (KOSDAQ)−8.63%· turnover ₩14.9bn
Seegene (KOSDAQ)−8.42%· turnover ₩13.7bn
Sphere * (KOSDAQ)−8.09%· turnover ₩10.0bn
Daewoo E&C−7.57%· turnover ₩66.4bn
Historical contextSelection: turnover of ₩10bn or more · machine ranking by percentage change.
Sources: Korea Exchange · NXT · own measurements · regular session confirmed 15:30 KST · The Silmari editorial desk.
This edition organises and explains publicly available market data. It is not investment advice. Predictions and their scores are preserved without revision — the judgement is yours.