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실마리 일지

Today’s close still has not arrived — late in the session KOSPI stood above the previous close — Korea Market After-Hours, Aug 31, 2026

Today’s index close had not arrived in the data by the time of this edition either — the second edition in a row.The intraday path, however, now runs to 15:32. Its last reading is KOSPI 6,820.02 and KOSDAQ 834.29.

The Silmari
A daily data newsletter on the Korean stock market — silmari, ‘a clue: the loose end that unravels the knot’
⑤ After-Hours 18:002026.08.31 Mon · No. 28Caution — late in the session KOSPI stood above its previous close and KOSDAQ below it, while after hours more names fell than rose. With today’s close absent for a second edition, the day cannot be settled into a single figure. The sentiment gauge and the flow figures both differ from the close edition, but these are places where the inputs changed, so they are not read as a change in the market.
⑤ After-Hours · published 18:00 KST · after the regular session · Note: flow figures are preliminary as published just after the close; the exchange’s confirmed figures appear in that day’s Final Edition (20:00 KST).
01 · VerdictRegular session confirmed (2-source reconciliation)

verdict at evening

Today’s close still has not arrived — late in the session KOSPI stood above the previous close

Today’s index close had not arrived in the data by the time of this edition either — the second edition in a row.The intraday path, however, now runs to 15:32. Its last reading is KOSPI 6,820.02 and KOSDAQ 834.29. The previous closes were KOSPI 6,788.88 and KOSDAQ 838.41 — so KOSPI was above that level late in the session and KOSDAQ below it.That reading is not the close. The closing level is set separately in the closing auction, and it has not arrived.In after-hours trading more names fell than rose — of 606 names covered, 238 rose and 345 fell. The heavily traded large caps, though, are on the rising side.

Key points
01The intraday path’s last reading is KOSPI 6,820.02 — taken at 15:32, above the previous close of 6,788.88. The closing level set in the closing auction differs from this, and has not arrived.
02KOSDAQ sits on the other side834.29 at the same moment, below its previous close of 838.41. The two indices were heading into the end of the session in opposite directions.
03After hours, name count and turnover point different ways345 names fell against 238 that rose, yet the two most heavily traded, SK hynix at +0.91% and Samsung Electronics at +0.97%, are higher. These are delayed figures as of 17:25.
04The flow figures have shifted since the close edition — KOSPI investment firms moved from -KRW 274.0bn to -KRW 795.9bn. The other groups moved only slightly; this one line opened up. The figures are compiled once more in the evening.
05The sentiment gauge also changed, but it means something else — from 0.443 at the close edition to -0.11. Not because the market moved that far, but because what it is measured from changed. The two editions draw on different components, and every component present carries an August 28 reference date.
02 · NXTNXT intraday — 20-minute delay · as of 17:25 KST

Evening disclosures —Short sellingSelling borrowed shares first, betting the price will fall.A rising balance means more money is betting on a decline.balance

A window on whether the regular session’s move carried into the evening alternative venue

More names fell than rose after hours — yet the two most heavily traded are higher

The Nextrade snapshot is a delayed reading as of 2026-08-31 17:25. It is not a settled figure for the day, and it is not a Korea Exchange main-session number.Of 606 names covered, 238 rose, 345 fell and 23 were unchanged, on total turnover of KRW 11,008.3 bn. By name count the declining side is larger.The turnover leaders point the other way — SK hynix +0.91% (KRW 2,754.9 bn), Samsung Electronics +0.97% (KRW 2,210.9 bn), Samsung Electro-Mechanics +2.18% (KRW 572.2 bn) and Samsung SDI +2.8% (KRW 384.8 bn) are all higher.The only decliner among the top five is Doosan Enerbility at -5.78% (KRW 231.8 bn) — the same name that fell alone and hardest within the main-session list.No settled tally exists for today yet. The most recent settled date is August 28, when the total came to KRW 11,956.2 bn at a 11.78% share.

03 · Gap risksRisk → same condition in the past → outcome distribution

Tomorrow morninggap risks 4names

A window naming in advance what could shake tomorrow’s opening price

Doosan Enerbility, alone in falling hard in the main session, is lower after hours too

ADR

Warning score total: 3

signal 2 points

Short-interest surge

Warning score total: 3

signal 0 points

Selling acceleration

Warning score total: 3

signal 1 point

Sentiment 90+

Warning score total: 3

signal 0 points

05 · Principleas of 18:09 KST on 2026-08-31

Evening Trading Principles

A window recording the trading principles to hold to on the evening of a crash day

Two editions on the same day carried different figures — not because the market moved, but because the inputs changed

Two figures differ between today’s close edition and this one. What changed matters less than why.The sentiment gauge moved from 0.443 to -0.11. But the two editions produced their readings from different components — an item present in one dropped out of the other, and an item absent before appeared. It does not mean the market moved by that much.Further, every component present — margin balances, deposit requirements, buying into falling names, volatility — carries an August 28 reference date, and the short-selling item carries August 26. Not one of them is filled with a figure from today.The crash-precursor score reads 3 today, within the alert band. The items lit are the advance-decline ratio at 2 and selling acceleration at 1 — but the first rests on a July 28 US session reading and the second on flows from August 27 and August 28. Neither was lit by data from today.Flows shifted too. KOSPI investment firms widened from -KRW 274.0bn to -KRW 795.9bn while the other four moved little. This edition’s flows come from a fallback route rather than exchange data, and they are compiled again in the evening.So the day is not summed up from this edition’s figures. Nor is it the place to pick which of the two editions’ readings is the right one.

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.