verdict at evening
KOSPI Closes at 6,813 on Foreign Net PurchaseThe difference between the total value of shares bought and sold by a given investor group over a period; a positive number means that group bought more than it sold.The daily net buying figure for foreigners, institutions, and retail investors is the primary flow signal watched by Korean market participants to gauge directional conviction. of ₩3.72tn; Aftermarket Softer
The KOSPI closed Thursday, August 13 (2026) at 6,813.34, up 3.56%, as foreign investors posted provisional net purchases of ₩3.72tn on the main board — the dominant buying force on the day against net selling by retail investors of ₩2.60tn and institutional net selling of ₩1.07tn (all figures provisional as of 17:52 KST).The KOSDAQ closed at 861.37, up 0.29%, lagging the main board sharply — the morning call for KOSDAQ (+0.5~1.5%) overshot the actual outcome; the KOSPI call (+0.8~2.0%) undershot, with the index settling above the upper end of the projected range.
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
NXT Aftermarket Tilts to Sellers — 350 Issues Down vs. 238 Up at the 17:25 Snapshot
In NXT (the alternative exchange, separate from KRX), the 20-minute delayed snapshot as of 17:25 KST showed 350 issues declining and 238 advancing out of 608 names, with combined NXT-only turnover of ₩179.7bn — these are NXT figures only and are not final confirmed data (confirmed daily totals are registered later in the evening).Among the top five NXT names by turnover, Samsung Electronics showed a gain of 3.13% and SK hynix +4.26% in the aftermarket snapshot, both running below their KRX closing-session gains of +4.89% and +5.92% respectively, while Samsung Electro-Mechanics was indicated at +10.56% vs. its KRX close of +12.58%.
Tomorrow morninggap risks 4names
A window naming in advance what could shake tomorrow’s opening price
Crash-Precursor Score Holds at 3 of 10; Volatility Percentile Elevated at 94th
Warning score total: 3
signal 2 points
Warning score total: 3
signal 1 point
Warning score total: 3
signal 0 points
Warning score total: 3
signal 0 points
Evening Trading Principles
A window recording the trading principles to hold to on the evening of a crash day
A 3.56% Up Day with Broad Lags in KOSDAQ and Aftermarket Retreat in Semis Warrants Watching the Spread
The collapse-precursor score is 3 out of 10 today, with the ADR signal (2 points) and the short-surge flag (1 point) as the active components; the two remaining inputs — panic-buying-on-down-days and sentiment-above-90 — are not triggered.Twenty-day realized volatility stands at the 94th percentile in the current 2026 regime (expanding window), which historically has been associated with wider intraday ranges — today’s 2.19% KOSPI high-low spread is consistent with that backdrop.In the current regime (2026), on the 32 Thursdays in the sample, foreign investors have been net buyers on only 28% of occasions; today’s provisional foreign net buying of ₩3.72tn is therefore directionally atypical for the day of the week — readers may find it useful to monitor whether the provisional figures are revised when confirmed data are registered later this evening. The judgment is each reader’s own.