Korea Exchange pauses KOSPI program trading for the second time in two days after a 5% drop

The prior close follows from Yonhap's figures: 5,705.42 plus the 303.39-point loss gives 6,008.81 ^[5][7]. A 5.59% opening gap from that level puts the open near 5,673 ^[8], so at 9:11 a.m. the index sat about 32 points above where the session began ^[9]. That is a thin cushion. The 5.05% decline Yonhap reported was 0.05 percentage points past the 5% line ^[10], and the line itself is drawn on KOSPI 200 futures held for a full minute ^[2], so the spot reading only approximates the test.

The obvious reading of two triggers in two days is sustained volatility ^[11], and part of it holds. Yonhap attributes the 15th to selling in semiconductor shares, Samsung Electronics and SK hynix among them, on persisting skepticism over the AI trade and renewed concerns over US inflation ^[6]. Persisting and renewed both describe drivers older than the 15th. That points to one slow-moving episode that has tripped the rule twice, or rather (the more careful version) one episode seen in detail on a single day, since the reports do not describe the size or the cause of the 13th trigger ^[11].

Our view is that the drivers are persistent and the count is thin: two sessions, one of them undescribed. Two other paths are open. The 15th could be the second leg of a slide that ends in a third trigger, or the open near 5,673 could hold and leave two gap-downs with no trend behind them ^[8]. An index that trades back above its open would count against persistence; one that sinks below it would count for it.