At the October 12, 2026 Korean close, foreign investors sold both SK hynix (Korea Exchange, KRX: 000660) and Samsung Electronics (KRX: 005930). That confirms foreign selling pressure in both leaders for the session. It does not establish a uniform exit from Korea’s memory sector because institutional flows moved in opposite directions, and these categories do not cover every market participant.
This article uses the Korean market close on October 12, 2026. The data comes from a public Naver feed carrying KRX session classifications, and the research snapshot was generated at 21:16 China Standard Time on October 12, after the Korean close. Closing prices below are used to convert net shares into a value proxy; the proxy is not the actual net traded value.
The data endpoints are Naver’s SK hynix classified-flow feed and Samsung Electronics classified-flow feed. Security identity is cross-checked against the SK hynix quote page, Samsung Electronics quote page, and Samsung Electronics listing information.
The two leaders show different flow structures
| Company | Code and market | Close | Volume | Foreign net shares | Foreign as % of volume | Institutional net shares | Institutional as % of volume |
|---|---|---|---|---|---|---|---|
| SK hynix | KRX: 000660 | KRW 1,605,000 | 3,063,665 shares | -618,288 shares | -20.18% | +121,438 shares | +3.96% |
| Samsung Electronics | KRX: 005930 | KRW 251,000 | 17,852,804 shares | -2,178,086 shares | -12.20% | -1,719,656 shares | -9.63% |
Foreign direction has one common feature. Both companies recorded net foreign selling, and the foreign flow was larger relative to session volume in SK hynix. The reported foreign ownership ratios were 49.52% and 46.35%. Those are stock measures of ownership, not the percentage sold during the session.
Institutional direction diverged. Institutions bought 121,438 SK hynix shares and sold 1,719,656 Samsung shares. The statement that “foreign and institutional investors were both leaving Korean memory stocks” describes Samsung’s session, not SK hynix’s.
Converting shares into a common-currency proxy
To compare the two companies without mixing share counts, this article uses net shares multiplied by the session close as a price-fixed value proxy. The formula does not reconstruct actual traded cash because transactions occurred at different prices and the classification data does not provide the price distribution of each trade.
| Company | Foreign value proxy | Institutional value proxy | Session turnover proxy |
|---|---|---|---|
| SK hynix | -KRW 992.35 billion | +KRW 194.91 billion | KRW 4.92 trillion |
| Samsung Electronics | -KRW 546.70 billion | -KRW 431.63 billion | KRW 4.48 trillion |
The proxy gives two reproducible observations. For SK hynix, foreign selling was approximately KRW 992.35 billion at the closing price, while institutional buying was approximately KRW 194.91 billion. Institutional buying therefore offset part of the foreign-selling proxy. For Samsung, both categories were negative, with the two value proxies adding to approximately negative KRW 978.33 billion. That sum still cannot be treated as the net outflow of all market participants.
What this session can answer
It answers a narrow question. On October 12, both Korean memory leaders recorded net foreign selling, so a common foreign selling signal was present in the session.
It cannot answer three larger questions. It cannot show that foreign investors sold every Korean memory stock. It cannot transfer Samsung’s institutional selling result to SK hynix. It cannot turn one session of classified flows into a forecast for the next session’s share-price direction.
The participant split is not closed as a full-market zero-sum ledger. Foreign investors, institutions, retail investors, other corporations and reporting categories must be reconciled before the market-wide flow can be described. The most defensible wording is that foreign direction was aligned across the two leaders while institutional direction was not. That is narrower than calling the session a full de-risking event for Korean memory stocks.
What to watch next
If foreign investors sell both names again and SK hynix institutions turn into net sellers, evidence for a more unified exit would strengthen. If SK hynix institutions keep buying while Samsung remains negative across both categories, the divergence would continue to point toward company-level or flow-structure differences. Both cases require the next Korean close for confirmation, and neither should be written as a price forecast.
Further reading: Samsung’s Buyback Ends: Why Missing Demand Is Not New Selling
This is public-layer data research, not investment advice or a return promise.