Semiconductor duo powers the charge

The advance was attributed to a rally in Samsung Electronics and SK hynix, the two large-cap chipmakers commonly described in Korean coverage as the market's 'ssangdumacha' (twin leading horses). Memory stocks have been a key engine of the index's movement, with SK hynix's momentum tied to ongoing interest in high-bandwidth memory for AI applications.

SK hynix's disclosure pipeline in recent months has included references to its 12-layer HBM4E samples and to a share buyback-and-retirement program, reflecting continued corporate activity around the memory boom, though the sources reviewed did not directly tie these items to the 7,100 breakout.

Holiday timing shapes the market narrative

The move to 7,100 came just ahead of Chuseok, Korea's major autumn holiday, a period during which trading typically thins and investors weigh position adjustments before the market closure. The claim that the index "reclaimed" the 7,100 line suggests the level had been lost in an earlier pullback; the sources reviewed did not establish the full history of that round-trip.

The broader market context — including foreign and institutional flows into the semiconductor names — was not fully documented in the available material, leaving the durability of the rally an open question.

A final assessment finds the core claim that the KOSPI retook the 7,100 level ahead of Chuseok on a Samsung Electronics–SK hynix rally to be Partly True.