Daily Pulse: September 30, 2026
KOSPI -0.48% | KOSDAQ +0.72% | Foreign cash and futures sold in the same direction: Samsung Electronics and SK Hynix absorbed KRW 1.48 trillion (~$1.1B), 69% of total foreign net selling, while the KOSPI opened at 6,943, touched 6,965, and closed at 6,838, a 1.83% give-back from the session high
The Number That Matters
The KOSPI opened at 6,943, touched 6,965, and closed at 6,838. The 1.83% give-back from the session high is the story, not the headline decline. Foreign investors sold KRW 2.14 trillion (~$1.6B) net in cash while simultaneously selling 4,800 futures contracts, both legs moving in the same direction. Samsung Electronics and SK Hynix accounted for 69% of that foreign cash selling.
Where the Money Went
Foreign sellers concentrated in Samsung Electronics at KRW 866B (~$639M) and SK Hynix at KRW 611B (~$450M), with Samsung Electronics preferred shares adding KRW 206B (~$152M). Against that, foreign buying in SK Square, Jusung Engineering and HD Hyundai Heavy Industries totalled KRW 69B (~$51M), roughly 4% of foreign selling in the top three names. Among institutions, financial investment sold KRW 821B (~$605M) and was the dominant component; investment trusts bought KRW 188B (~$138M) while pension funds sold KRW 7B (~$5M). Non-arbitrage program trading sold KRW 1.30 trillion (~$961M) net, the largest single institutional flow on the session. Retail bought KRW 1.23 trillion (~$907M) net, with Samsung Electronics at KRW 688B (~$507M) and Samsung Electronics preferred shares at KRW 250B (~$184M) the two largest entries. Jusung Engineering and Hanwha Solutions were the only names where foreign and institutional conviction overlapped, with retail selling into both.
Why the Market Moved
1. Foreign cash and futures moved in the same direction; Samsung Electronics and SK Hynix absorbed 69% of foreign net cash selling at KRW 1.48 trillion (~$1.1B) combined.
2. Non-arbitrage program trading sold KRW 1.30 trillion (~$961M) net, the dominant institutional flow on the session; financial investment led institutional selling at KRW 821B (~$605M).
3. SOX gained 1.32% overnight, making the two-stock foreign sell concentration the defining divergence of the session.
The Uncomfortable Question
SOX rose 1.32% and foreign investors sold KRW 866B (~$639M) of Samsung Electronics and KRW 611B (~$450M) of SK Hynix in the same session. Retail absorbed KRW 688B (~$507M) of Samsung Electronics alone. The watchpoint from the prior session was whether foreign net cash in SK Hynix would turn positive. It came in at negative KRW 611B (~$450M). Whether retail is accumulating at a durable entry or absorbing a foreign exit with no near-term reversal catalyst cannot be answered from this session's data.
KoreaAlpha Take
Sell-side desks will note that SOX rose and retail stepped in. Neither observation addresses the problem. The two semiconductor names have drawn concentrated foreign selling across consecutive sessions, and the buyers on each occasion have been retail investors. The unresolved question is who absorbs this foreign selling once the price-insensitive corporate buyers complete their scheduled acquisition programs, both of which have end dates before 22 November 2026. The trade is simple: watch whether foreign net cash in SK Hynix turns positive in the next session.
Data sources: Korea Exchange, DART, Bloomberg
Research only. Not investment advice. KoreaAlpha does not provide personalised recommendations.
Flow figures are KRX investor-type trading value across all listed boards (KOSPI, KOSDAQ, KONEX), common stock only, excluding ETF, ETN and ELW; institutions = the KRX institutional total investor type. Foreign, institutional and retail do not sum to zero: the balance, KRW 1.66 trillion (~$1.2B) net bought on this session, sits with other corporations and other foreign investors, categories this report does not collect.
