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US markets rose sharply overnight — for once all four strands point the same way — Korea Market Pre-Open, Aug 28, 2026

Semiconductors led the overnight session in the United States — the Philadelphia Semiconductor Index rose +2.33%, the Nasdaq +1.57%, the S&P 500 +0.72% and the Dow +0.2%.The US-listed exchange-traded fund holding Korean equities also rose +1.65%. The KOSPI close that stood as two figures into la

The Silmari
A daily data newsletter on the Korean stock market — silmari, ‘a clue: the loose end that unravels the knot’
① Pre-Open 07:302026.08.28 Fri · No. 25Caution — the overnight signals converged to the upside, yet two crash-precursor items are lit. The dates behind those two are 28 July and 21 August, not today. Market breadth has had no value for four sessions — the last confirmed reading is KOSPI 2.02 on 24 August.
① Pre-Open · published 07:30 KST · before the open
01 · VerdictRegular session confirmed 15:30 KST

Today’s Calls

US markets rose sharply overnight — for once all four strands point the same way

Semiconductors led the overnight session in the United States — the Philadelphia Semiconductor Index rose +2.33%, the Nasdaq +1.57%, the S&P 500 +0.72% and the Dow +0.2%.The US-listed exchange-traded fund holding Korean equities also rose +1.65%. The KOSPI close that stood as two figures into last evening has settled at 6,912.37, up +1.53% on the session.The KOSDAQ close settled at 837.65.

Key points
01Yesterday’s unsettled close has closed — yesterday’s pages carried KOSPI as both 6,879.87 and 6,912.37; the settled figure is 6,912.37, up +1.53%, with KOSDAQ at 837.65. The two sources now point to the same value.
02The overnight signals converged — the semiconductor index +2.33%, the Nasdaq +1.57% and the S&P 500 +0.72%. Yesterday the four strands were scattered and could not separate a direction; today is different.
03Today’s calls stake a direction — for KOSPI, the Nasdaq bucket carries an advance probability of 77% (sample 207) and the semiconductor bucket 70% (sample 334). Even the weakest strand clears 59%, so the band alone is not stated as it was yesterday.
04Market breadth has had no value for four sessions — the exchange data source is blocked. The last confirmed reading is KOSPI 2.02 on 24 August, and the stretch since is empty.
02 · Prediction2 calls · posted 07:30 KST

Today’s Calls

Where the day’s calls are placed by number — grading starts with the Early Session edition

A direction is staked today — the strongest strand puts KOSPI at 77%

KOSPI is called to the upside today, on the grounds that all four strands point the same way — in the Nasdaq +1.57% bucket, the next session rose 77% of the time across 207 cases, averaging +0.77%, with the middle half between +0.04~+1.24%.The semiconductor +2.33% bucket carries 70% across 334 cases, the VIX -4.60% bucket 60% across 275, and the WTI +1.79% bucket 59% across 345. Even the weakest strand clears 59%.KOSDAQ leans the same way but less steeply — 72% in the Nasdaq bucket, 67% in the semiconductor bucket, 58% in the VIX bucket and 55% in the WTI bucket, lower than KOSPI on every strand.

calls placed today
2 issues
posted 07:30 KST
Direction grading
from the 10:00 Early Session edition
Magnitude grading
settled in the 20:00 Final Edition
Call ① KOSPIAdvance probability 77% (based on 207 similar past days)
70% bandA range set from how much the subject has been moving in a single day recently, wide enough that the outcome falls inside it roughly seven times in ten.On days with little basis to call a direction the band alone is stated; on days when the grounds converge, a direction and a probability are given as well. -4.90~+4.90% · full session
Morning rationaleAll four strands point the same way — in the Nasdaq +1.57% bucket the next session rose 77% of the time (n=207, mean +0.77%, middle half +0.04% to +1.24%);Philadelphia Semiconductor Index (SOX)A stock index of leading semiconductor companies compiled by the Philadelphia exchange, representing the sector as a whole.KOSPI carries a heavy semiconductor weighting and has often moved the same way the day after a large move in this index — a tendency, not a rule.+2.33% bucket 70% (n=334, mean +0.47%); the VIX -4.60% bucket 60% (n=275); the WTI +1.79% bucket 59% (n=345) — even the lowest strand clears 59%
Call ② KOSDAQAdvance probability 72% (based on 207 similar past days)
70% band -3.56~+3.56% · full session
Morning rationaleKOSDAQ leans the same way but with a shallower tilt: the Nasdaq bucket rose 72% of the time (n=207), the SOX bucket 67% (n=334), the VIX bucket 58% (n=275) and the WTI bucket 55% (n=345) — every strand lower than KOSPI’s

Yesterday the strongest strand reached only 61%, which could not separate a direction, so a band was stated and no direction staked. Today it reaches 77%.Even so, 77% means that in the same setup the outcome went the other way two or three times in ten. The sample is 207 cases, and that figure does not settle today.All five of yesterday’s calls landed inside their bands — on a day when no direction was staked, the scoring can say only that nothing was got wrong.

03 · OvernightOvernight, confirmed — previous U.S. session

The world overnight — how the US session ended

A window on what happened in the US market overnight

A night led by semiconductors — the Philadelphia index rose +2.33%

Nasdaq26541.35 (+1.57%· as of 2026-08-27)
S&P5007730.99 (+0.72%· as of 2026-08-27)
SOX semiconductors11882.17 (+2.33%· as of 2026-08-27)
Dow53569.44 (+0.20%· as of 2026-08-27)
Korea equity exchange-traded fund (EWY)A US-listed exchange-traded fund tracking Korean equities.It trades while the Korean market is closed, so it is read as an indirect view of how foreign investors are seeing this market.(Korea ETF)182.14 (+1.65%· as of 2026-08-27)
Dollar index99.13 (−0.04%· as of 2026-08-27)
U.S. 10-year Treasury4.67 (+0.17%· as of 2026-08-27)
Nikkei 225 (prior session)66262.16 (+0.62%· as of 2026-08-26)
USD/KRW (prior Seoul session)1382.0 (−0.29%· as of 2026-08-27)

US markets moved higher overnight — the Philadelphia Semiconductor Index +2.33%, the Nasdaq +1.57%, the S&P 500 +0.72% and the Dow +0.2%, all as of 27 August.That semiconductors outpaced the broad indices is the detail that matters most for the Korean session — KOSPI carries a heavy semiconductor weighting and has often moved with that index.The US-listed fund holding Korean equities rose +1.65%, a figure read as the temperature at which foreign investors are viewing this market.

04 · Cross-followingMeasured in 2026

Korea–U.S. mutual following — overnight grading

A window on which market followed which

With the US moving sharply overnight, today counts as a following day

Following is measured by whether the overnight semiconductor index and that day’s KOSPI moved the same way. With the index up +2.33% overnight, today clears that threshold.Yesterday the US barely moved and the session fell outside the threshold — two consecutive nights of quite different character.

Following is a record counted after the fact, not a rule that governs today.That the two have often moved together and that they will do so today are different statements.

Days Korea followed the U.S.39 days
Days the U.S. followed Korea30 days
Both ways46 days
Sample139 days

Overnight SOX ↔ same-day KOSPI in the same direction (|SOX| ≥ 0.5%) = Korea following · same-day KOSPI ↔ that night’s SOX in the same direction (|KOSPI| ≥ 0.5%) = the U.S. following

05 · Night windowOvernight indicators

Night window —EWYofficial indicator

A window on what overnight futures foreshadow for the next day’s open

US futures are slightly higher this morning — S&P 500 +0.19%, Nasdaq 100 +0.46%

Nasdaq26541.35 (+1.57%· as of 2026-08-27)
S&P5007730.99 (+0.72%· as of 2026-08-27)
SOX semiconductors11882.17 (+2.33%· as of 2026-08-27)

This morning US futures stood at +0.19% for the S&P 500 and +0.46% for the Nasdaq 100, with Nikkei futures at -0.02%.The reference is the 08-28 05:00 bar against 08-27 15:00. This is movement after the cash session closed and does not set the direction of the open.

06 · Pre-openPre-open check

Pre-open08:00~09:00single-price auction (open/close)The single-price auction window (before the open and just before the close), where orders are pooled and matched at once.When large volume crowds into this window, a gap is created.forecast

A window on where the pre-open auction is pulling the opening price

The pre-open reading equals yesterday’s close — there is no move for today yet

As of 07:10 before the open, the live reading was KOSPI 6,912.37 and KOSDAQ 837.65, the same as yesterday’s settled close.A table showing 0.0% does not mean the market has not moved; it means the session has not opened.Both sources are giving the same value — the entry that diverged all through yesterday is currently in agreement.

KOSPIClose6,912.37· same-day+1.53%
KOSDAQClose837.65· same-day+1.30%
Historical contextPre-open reading as of 07:10 · both sources agree · today’s change appears after the open
07 · ReviewConfirmed, previous session (08.27)

Previous-Day Review

A window that retraces what happened in the previous session

Yesterday’s close settled this morning — the entry that ran as two figures on the page

KOSPIClose6,912.37· same-day+1.53%
KOSDAQClose837.65· same-day+1.30%
08 · Fear gaugeStanding gauge8 components · as of the previous session (08.27) · percentile: current regime (2026)

The Silmari Fear Gauge

A window measuring market anxiety through volatility, margin lending and short selling

Two crash-precursor signals are lit — but the dates behind them are not today

Volatility percentile
86
0-100 · higher = louder warning · current-regime (2026) basis · as of 08.27 (previous trading day — today’s reading lands after the close)
Margin balance, 5-day change5.72 — Change in Leveraged Purchases — Larger increases create greater forced liquidation pressure on declines ·As of 08.26
Forced-liquidation share1.3 — Share of Forced Liquidations — Higher ratio signals greater mechanical selling pressure ·As of 08.26
Short-interest surge multiple3.3 — Short bets multiplied how many times in 5 days — Steep surge is a warning signal ·as of 08.21
Retail buying intensity on down days0.0 — Not applicable — not a declining session (1.53%)
Consecutive no-trigger down days0.0 — N/A — No-trigger declines did not continue
KOSPI 20-day realised volatility5.03 Elevated · top 14%· Recent 1-month volatility size — dashboard’s core metric

Two of the four items that build the crash-precursor score are lit — the American depositary receipt item and the short-selling surge item.The dates behind them matter — the depositary receipt item draws on -16.7% from the US session of 28 July, and the short-selling item uses a balance date of 21 August.

Exchange short-selling balances are disclosed two days later, and margin balances and the unsettled-payment share arrive a day later. They are late, not missing.So several of the sentiment inputs visible this morning are several days old, and no regime is called from a single number.

Market breadth was not received today either — the exchange data source is blocked.The last confirmed reading is KOSPI 2.02 on 24 August, and the four sessions since have no value. Nothing is said about breadth being wide or narrow — it is absent, not zero.

09 · FX windowFX window — previous close

The won — the signal is the speed of the move, not its direction

A window on the pressure the won-dollar rate puts on foreign flows

The won-dollar rate was again not received; the dollar index was -0.05%

Dollar index99.123 (-0.05%) · 08-27
Won / dollarNot received today — insufficient sample
Yen / won (per 100 yen)Not received today — insufficient sample
US 10-year yield4.672% (+0.17%) · 08-27

The won-dollar exchange rate was not collected today — the sample was insufficient to carry a value. The same applies to the yen-won rate.The dollar index stood at 99.123, down -0.05%. A weakening dollar has tended to move together with foreign money coming into this market.

10 · KOSDAQ windowKOSDAQ close 837.65 · settled yesterday · pre-open live reading is the same figure

The SilmariDecouplingWhen two markets that used to move together break apart and move separately.The wider the gap, the less any single index can tell you about the market.Gauge

A window on the pattern in the KOSPI–KOSDAQ decoupling

KOSDAQ settled at 837.65 yesterday — today’s signal is shallower than KOSPI’s

KOSPI · KOSDAQ close (08.27)6,912.37 · 837.65
Previous session change+1.53% · +1.30%
Previous-session gap (KOSPI − KOSDAQ)+0.23%p
Cumulative year to date (through 08.27)+60.39% · −11.41%
Silmari Decoupling Gauge — year-to-date gap+71.81%p
11 · WarningToday’s warning score of 3 = crash alert — thresholds: 3+ crash alert · 2 caution (small sample)

Warning

A window flagging in advance where today’s session calls for caution

On a day when the signals converge, read the sample and the probability together

Days on which all four strands point the same way are uncommon, which is precisely why the numbers should be read as they are.That the strongest strand carries an advance probability of 77% means that in the same setup the outcome went the other way two or three times in ten. The sample is 207 cases.This page does not tell anyone what to buy or sell — it records what was there and how similar situations turned out.

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.