Why foreigners sold 1.75 trillion won of Korean stocks — U.S. yields at a 2002 high
On October 6, 2026, foreign investors sold a net 1.75 trillion won (about $1.3 billion) of shares on the main Korean market and the KOSPI fell 0.89% to 6,941.39, slipping back below 7,000. The main trigger was the U.S. bond market. While Korea was closed for a holiday, the 10-year Treasury yield rose to about 5.35% and the 30-year to about 5.70% on October 5, both the highest since 2002, after the ISM services prices index jumped to 74.0 and markets priced in a Fed rate hike by December. When safe U.S. bonds pay over 5%, emerging-market stocks need higher expected returns. Selling focused on this year's big winners in chips, while the KOSDAQ rose 2.98% on batteries and biotech
The three lines
- Result — foreigners net sold 1.75T won; KOSPI 6,941.39 (−0.89%); SK Hynix −3.69%, Samsung Electronics −1.45%
- Cause — U.S. 10-year ~5.35%, 30-year ~5.70%, highest since 2002; services prices at 74.0 revived hike bets
- Rotation — money left chips for batteries and biotech; KOSDAQ +2.98% to 919.92; retail bought 740.6B won
Key questions
- Why did foreign investors sell KOSPI on October 6 2026
- **Mainly U.S. long-term yields, plus profit-taking in chips.** | Factor | Detail | |---|---| | U.S. 10-year | ~5.35% on Oct 5, highest since 2002 | | U.S. 30-year | ~5.70%, highest since 2002 | | Inflation signal | ISM services prices 74.0, highest since July 2022 | | Fed pricing | One 25bp hike priced by December | | Chips | Profit-taking after a huge 2026 run |
- How do higher Treasury yields affect Korean stocks
- **A higher risk-free rate raises the bar for riskier assets.** | Channel | Effect | |---|---| | Comparison | 5%+ on Treasuries lifts required returns elsewhere | | Discounting | Future profits are worth less today | | Growth stocks | Tech, with profits further out, moves first | Yet the S&P 500 hit a record the same day, so yields alone do not explain everything.
- KOSPI vs KOSDAQ October 6 2026
- **A rotation, not a retreat.** | Index or stock | Oct 6 | |---|---| | KOSPI | 6,941.39 (−0.89%) | | KOSDAQ | 919.92 (+2.98%) | | SK Hynix | 1,773,000 won (−3.69%) | | Samsung Electronics | 272,000 won (−1.45%) |
The KOSPI's fall back below 7,000 came from across the Pacific, not from inside Korea. On October 6, 2026 — the first session after Korea's National Foundation Day holiday weekend — foreign investors sold a net 1.75 trillion won of shares, and the KOSPI fell 0.89% to 6,941.39. The same day the S&P 500 hit a record. The gap is explained by U.S. Treasury yields.
1. What the bond market did while Korea was closed
| Indicator | Reading | Meaning |
|---|---|---|
| September U.S. payrolls | +29,000 (vs ~80,000+ expected) | Hiring slowed |
| Unemployment rate | 4.2% (from 4.1%) | Slightly higher |
| ISM services prices (Oct 5) | 74.0, highest since July 2022 | Services inflation back |
| U.S. 10-year yield (Oct 5) | ~5.35%, highest since April 2002 | Long borrowing costs jump |
| U.S. 30-year yield | ~5.70%, highest since 2002 | Deficit and supply worries |
| Fed pricing | One 25bp hike by December | A hiking, not cutting, cycle |
Weak jobs data usually pulls yields down. This time the services-price surge outweighed it, and worries about deficits and heavy Treasury issuance pushed long rates higher. In late September the 10-year had already hit 5.18%, then a post-2007 high; within ten days the comparison point moved back to 2002.
2. Why the money left Korean chips
If U.S. government bonds pay more than 5% with no credit risk, investors demand more from emerging-market equities. A higher required return means a lower price for the same earnings outlook — and the biggest winners of the year are trimmed first.
| Item | October 6 |
|---|---|
| KOSPI | 6,941.39 (−62.35, −0.89%) |
| Foreign investors (KOSPI) | −1.75 trillion won net |
| Individuals (KOSPI) | +740.6 billion won |
| Institutions (KOSPI) | −2 billion won |
| SK Hynix | 1,773,000 won (−3.69%) |
| Samsung Electronics | 272,000 won (−1.45%) |
| KOSDAQ | 919.92 (+26.63, +2.98%) |
SK Hynix and Samsung drove most of this year's KOSPI rally, so they carry the largest foreign holdings and absorb the most selling.
3. Why the KOSDAQ rose 3% the same day
Money moved rather than left. Part of what came out of chips went into batteries and biotech: Samsung SDI and LG Energy Solution rallied on the main board, and foreigners and institutions were both net buyers on the KOSDAQ, which regained 910 for the first time in about three months.
The U.S. market supports reading this as rotation rather than risk aversion: the S&P 500 rose 0.58% to a record 7,818.93, the Nasdaq closed at a record 27,599.79, and Nvidia gained. This looks less like doubt about the AI chip cycle than like trimming richly valued Korean large caps in a higher-rate world.
4. What remains unconfirmed
- Samsung Electronics' preliminary third-quarter results on October 8 are the first test of whether chip selling reverses.
- Whether U.S. long yields push beyond their 2002 levels depends on coming inflation data and Treasury auctions.
- The split between rate-driven selling and profit-taking cannot be measured.
- A late-October Fed hike is priced at only about 20–25%.
Sources
- Kangwon Domin Ilbo — KOSPI closes at 6941.39 as foreigners sell 1.7509 trillion won
- Money Today — KOSPI closes at 6941.39, down 62.35 points
- SmartBiz — KOSPI loses 7,000 as foreigners sell 1.7 trillion won; KOSDAQ up 3%
- CNBC — 10-year Treasury yield rises to fresh 2002 high to start the week
- Yahoo Finance — Stock Market Today (Oct. 6, 2026)
- CaixaBank Research — Financial Markets Daily Report 05 October 2026