Source: Sisa Journal · 경제

What happened

According to Sisa Journal, the KOSPI surged at the open on Tuesday, August 18, powered by more than 1 trillion won in foreign net buying, and briefly cleared the 7200 level intraday. By 9:56 a.m., the benchmark stood at 7163.71, up 185.77 points (2.66 percent) from the prior session. It had opened at 7127.77 and touched 7216.62 during the morning — a sharp rebound that put the 7000 handle back in play.

The move tracked overnight strength in U.S. semiconductor names even as broader American indices slipped. Samsung Electronics and SK hynix led the domestic tape at the same timestamp.

The breakdown

On the main board, foreign investors net bought 1.631 trillion won by mid-morning. Institutions added 759 billion won. Retail investors net sold 1.994 trillion won — foreigners chasing chip-led rallies while domestic individuals took profits into the spike.

Overnight, all three major U.S. indices fell on rising international oil prices and a jump in U.S. Treasury yields, Sisa Journal reports. Semiconductor stocks were the exception. Sandisk rose 8.88 percent, Micron 4.13 percent, and SK hynix’s U.S. depositary receipt 3.04 percent. The Philadelphia Semiconductor Index gained 1.64 percent.

That chip tailwind carried into Seoul. At 9:56 a.m., Samsung Electronics was up 2.91 percent at 282,500 won and SK hynix jumped 7.48 percent to 1,768,000 won. SK Square, Samsung Life, and other Samsung-group names also rose; LG Energy Solution and Samsung Biologics slipped.

KOSDAQ rose 0.18 percent to 866.22 on a different flow map — retail net buying 982 billion won while foreigners and institutions net sold 98 billion and 869 billion won respectively.

Why it matters outside Korea

Anyone with Korea equity exposure, chip supply-chain contracts, or won-linked remittances should read Tuesday morning as a foreign-flow day, not a calm new equilibrium. 1.631 trillion won of foreign net buying in a few hours can move index levels and FX sentiment even when U.S. headline indices closed lower overnight.

Chip-specific momentum can decouple the KOSPI from a broader U.S. risk-off night — at least for a session. Retail selling into the foreign bid also matters: that distribution pattern often sets up sharper reversals if overseas buyers pause.

What travelers and expats should watch

• Do not treat 7200 as a stable floor: the index touched 7216.62 intraday but the 9:56 a.m. print was 7163.71 — morning spikes can fade; size any same-day trading or FX conversion for volatility, not the intraday high alone.
• Remittance and won timing: foreign buying of this scale can nudge the won intraday; if you are moving a large dollar→won transfer, re-check the live rate before locking — a chip-led KOSPI day is not automatically a won-strength day, but flows can shift quickly.
• No personalized buy/sell call: this is a market-structure brief, not investment advice.

Context

Read this as a foreign-led semiconductor rebound that reclaimed 7000+ quickly, not as proof that broader U.S. rate-and-oil pressure has stopped mattering for Korea. Sisa Journal’s operational stack is +2.66% at 9:56 / intraday 7216.62 / foreign net buy 1.631T won / retail net sell 1.994T won / SK hynix +7.48% / Samsung +2.91%. The non-wire insight: when Philadelphia chip names rally despite a red U.S. index night, Seoul can open as a one-way foreign bid into Samsung and SK hynix while Korean retail uses the pop to exit — a flow split that matters more for next-session risk than the headline “7200” tag.

Source

Sisa Journal: 외국인 1조원 순매수에 코스피 ‘껑충’…장중 7200선 돌파 — Korean original; paraphrased for briefing; read the original for full detail.