Daily Pulse: September 21, 2026
KOSPI +1.65% | KOSDAQ +1.11% | Foreign cash sold KRW 82B (~$60M): Samsung Electronics absorbed KRW 1.12T (~$813M) in foreign buying while SK Hynix drew KRW 671B (~$489M) in foreign selling
The Number That Matters
The KOSPI opened at 6,938, reached 7,028, and closed at 7,008, holding nearly all of the session gain. Foreign net cash selling of KRW 82B (~$60M) was the smallest outflow in eight sessions. The headline masks the structure: foreign investors bought KRW 1.12T (~$813M) of Samsung Electronics and sold KRW 671B (~$489M) of SK Hynix, a deliberate two-stock split that produced an almost flat net.
Where the Money Went
Foreign net cash of negative KRW 82B (~$60M) conceals a KRW 1.12T (~$813M) gross buy in Samsung Electronics, with SK Square at KRW 122B (~$89M) and Samsung Electronics preferred shares at KRW 120B (~$87M) completing the foreign top three. Against that, SK Hynix absorbed KRW 671B (~$489M) in foreign selling, making the net negligible but the composition striking. Institutions bought KRW 1.49T (~$1.1B) net; financial investment contributed KRW 1.25T (~$910M) of that total, against program trading net selling of KRW 415B (~$302M). Among the four institutional sub-categories this report tracks, pension funds sold KRW 64B (~$46M). Retail sold KRW 3.04T (~$2.2B), with Samsung Electronics at KRW 2.76T (~$2.0B) the single largest exit. Foreign and institutional conviction overlap covered Samsung Electronics, Samsung Electronics preferred shares and SK Square simultaneously, with retail delivering the volume to both.
Why the Market Moved
1. SOX rose 2.78% Friday, providing a semiconductor tailwind; foreign buying concentrated in Samsung Electronics rather than SK Hynix.
2. Institutions bought KRW 1.49T (~$1.1B) net, absorbing retail selling of KRW 3.04T (~$2.2B) across the semiconductor complex.
3. Foreign futures bought 4,251 contracts today, with cash and futures moving in opposite directions.
The Uncomfortable Question
Foreign investors bought KRW 1.12T (~$813M) of Samsung Electronics and sold KRW 671B (~$489M) of SK Hynix in the same session. That is not a return to Korean equities; that is a rotation within the semiconductor complex. Whether the Samsung Electronics gross buy represents the start of a sustained position rebuild, or whether the SK Hynix exit simply migrated into a different chip name, cannot be answered from one session of near-zero net foreign cash.
Key Disclosures Today
KOAS filed four amended material reports covering convertible bond and bond-with-warrant transactions on DART; no KRW amounts were disclosed in the filing summaries.
KoreaAlpha Take
Sell-side desks will call today's near-zero foreign net cash the inflection. Foreign investors sold KRW 671B (~$489M) of SK Hynix and bought KRW 1.12T (~$813M) of Samsung Electronics, producing a KRW 82B (~$60M) headline that tells almost nothing. The question today's data raises but cannot answer is whether foreign buying in Samsung Electronics will consolidate into a sustained position or whether tomorrow's session restores the one-sided semiconductor selling that defined the prior week. Foreign futures bought 4,251 contracts today; that is the only structural continuity point in this data. The trade is simple: watch whether foreign net cash in Samsung Electronics remains above KRW 500B (~$364M) 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 1.64 trillion (~$1.2B) net bought on this session, sits with other corporations and other foreign investors, categories this report does not collect.
