The Silmari

A daily data newsletter on the Korean stock market — silmari, ‘a clue: the loose end that unravels the knot’

⑤ After-Hours 18:002026.08.07 Fri · No. 5Anxiety — sentiment score 1.22; 20-day volatility at 97th-percentile and leveraged-fund share at 97th-percentile (2026 expanding baseline); three gauge inputs unavailable today.

⑤ After-Hours · published 18:00 KST · after the regular session

① Pre-Open07:30 ② Early Session10:00 ③ Midday12:00 ④ Closing16:00 ⑤ After-Hours18:00 ⑥ Final20:00

01 · VerdictRegular session confirmed 15:30 KST

verdict at evening

KOSPI Ends Down 0.6% in Wide-Range Friday Whipsaw

The KOSPI closed at 6,258.77 on Friday, August 7 (2026), down 0.60% on a session that swung 256.87 points — a high-to-low range of 4.17% — before settling into a narrow band above 6,250 through the close.The KOSDAQ finished at 798.81, off 0.36%, having also traced a 4.92% intraday range before recovering from a morning trough near 776.6; foreigners were net sellers on both boards while retail investors absorbed the flow.

Key points

01KOSPI printed a 4.17% intraday range (high 6,415.6 at 09:09, low 6,158.73 at 10:40) yet the day’s close of 6,258.77 was only 0.60% below Thursday’s settle — the bulk of the volatility resolved intraday rather than in the close.

02Foreigners were net sellers of ₩865.1bn on KOSPI and ₩252.2bn on KOSDAQ today (provisional); over the past week the combined foreign net sale on KOSPI reached ₩5,901.6bn, while retail investors bought ₩7,890.8bn net on KOSPI across the same five sessions.

03Sector rotation was sharp: energy & chemicals rose 7.65% and defense & aerospace 4.12%, while semiconductors fell 1.60% — SK hynix shed 4.88% and NAVER dropped 7.08%, the two heaviest drags by market cap weight among the day’s most-traded names.

04The sentiment gauge stands at 1.22 (“Anxiety” stage): 20-day volatility is at the 97th expanding percentile and the leveraged-fund share is also at the 97th percentile — two of the four collected inputs are elevated; three other inputs (credit balance, margin balance, short-surge) were not available today.

02 · NXTNXT after-hours reference time — not yet set

Evening disclosures —Short sellingShort 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

Day’s Closes — KOSPI 6,258.77 (−0.60%), KOSDAQ 798.81 (−0.36%) — Now Carry Into Overnight EWYiShares MSCI South Korea ETFA US-listed exchange-traded fund that tracks a broad index of Korean equities, traded in New York after Seoul’s market closes.EWY’s after-hours move is the most widely cited real-time proxy for overnight foreign sentiment on Korean stocks. Reference at 164.12

NXT after-hours commentary — data could not be collected

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

Morning Gap Reached 256.87 pts KOSPI Range Before Index Clawed Back Above 6,250

ADRAmerican Depositary ReceiptA US-traded certificate representing shares of a foreign company, priced in dollars on American exchanges.The overnight ADR change for SK hynix is used as a leading indicator for the following morning’s KOSPI open.

Warning score total: 3

signal 2 points

Short-interest surge

Warning score total: 3

signal 1 point

Selling acceleration

Warning score total: 3

signal 0 points

Sentiment 90+

Warning score total: 3

signal 0 points

05 · PrincipleEvening Trading Principles reference time — not yet set

Evening Trading Principles

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

Friday 2026-Regime Up-Rate 57% vs Average Move +0.57%; Today Closed −0.60% — Call Missed on Direction

Evening trading principles commentary — data could not be collected