Daily Pulse: September 22, 2026
KOSPI +0.15% | KOSDAQ -0.23% | Foreign cash net KRW 2B (~$2M): SK Hynix absorbed KRW 406B (~$299M) in foreign selling while Samsung Electro-Mechanics drew KRW 198B (~$146M) in foreign buying
The Number That Matters
Foreign cash net of KRW 2B (~$2M) is not a number. It is a rounding error that conceals a KRW 406B (~$299M) foreign sell in SK Hynix running against KRW 198B (~$146M) in Samsung Electro-Mechanics buying. The intraday collapse from 7,171 to a close of 7,017, a 2.1% give-back, confirms the index could not hold the morning gain regardless of global tailwinds.
Where the Money Went
The composition shows a clear split. Foreign buyers concentrated in Samsung Electro-Mechanics at KRW 198B (~$146M) and Samsung Electronics at KRW 192B (~$141M), while SK Hynix absorbed KRW 406B (~$299M) in foreign selling, roughly twice the combined foreign buy in the top two names. Institutions net sold KRW 225B (~$166M): pension funds sold KRW 234B (~$172M) and investment trusts sold KRW 255B (~$188M), while financial investment added KRW 155B (~$114M) alongside program trading net buy of KRW 99B (~$73M). Retail sold KRW 1.41T (~$1.0B), delivering Samsung Electronics at KRW 758B (~$559M) and Samsung Electro-Mechanics at KRW 320B (~$236M) to foreign and institutional buyers simultaneously. Samsung Electro-Mechanics, Samsung Electronics and LG Electronics were the only names where foreign and institutional conviction overlapped.
Why the Market Moved
1. SOX rose 4.29%, providing a semiconductor tailwind; foreign buying concentrated in Samsung Electro-Mechanics and Samsung Electronics rather than SK Hynix.
2. Retail sold KRW 1.41T (~$1.0B) net, with the two semiconductor names absorbing KRW 1.19T (~$877M) of that total; foreign and institutional buyers absorbed the supply.
3. The KOSPI opened near 7,160 and closed at 7,017, a 2.1% intraday reversal that erased the morning gain regardless of global tailwinds.
The Uncomfortable Question
Foreign and institutional buyers bought Samsung Electro-Mechanics and Samsung Electronics in size while simultaneously distributing SK Hynix at KRW 406B (~$299M). Foreign cash net was KRW 2B (~$2M), with foreign buying in the top two names representing roughly half of what SK Hynix alone absorbed in foreign selling. Whether this stock-by-stock divergence persists or resolves into either broad re-entry or broad exit cannot be answered from one session of near-zero net foreign cash.
Key Disclosures Today
KT&G filed a treasury share acquisition decision on DART; no KRW amount was disclosed in the filing summary.
KoreaAlpha Take
The prior session established a watchpoint: foreign net cash in Samsung Electronics above KRW 500B (~$364M). Today it came in at KRW 192B (~$141M). The watchpoint was not met. The SK Hynix divergence is the more uncomfortable data point: on a day when SOX rose 4.29%, the single largest foreign sell was KRW 406B (~$299M) in SK Hynix, not a rotation catalyst. The unresolved question is whether SK Hynix is being exited structurally while Samsung Electro-Mechanics and Samsung Electronics absorb selective re-entry, or whether today's split simply reflects one session of position adjustment before a broader move in either direction. 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 1.63 trillion (~$1.2B) net bought on this session, sits with other corporations and other foreign investors, categories this report does not collect.
