KOSPI Rebound of 4.39%: Is Foreign Buying a Bottom Signal?

On November 10, 2026, Korea's benchmark KOSPI closed at 5,239.13, up 220.28 points or 4.39%, according to Korea Exchange closing data reported by Asia Economy. The KOSPI rebound was the first gain in four sessions. The main trigger was a 6.86% overnight jump in the Philadelphia Semiconductor Index in the U.S. (M Economy News). Six minutes after the open, at 9:06 a.m. Korea time, a buy-side "sidecar" kicked in, and the index touched an intraday high of 5,300.92. The tech-heavy KOSDAQ rose 4.48% to 667.61. Foreign investors turned net buyers for the first time in eight sessions, and the won strengthened: the dollar-won rate closed the onshore day session at 1,337.5 won per dollar, down 9.6 won (Blockmedia).

A buy-side sidecar is a Korea Exchange mechanism that suspends program buy orders for five minutes when futures prices surge. On this day it was triggered on both the KOSPI and the KOSDAQ.

How much of the three-day loss did the KOSPI rebound recover?

The November 10 close won back 220.28 of the 664.95 points lost on November 5, 6 and 9, or about 33%. The index still sits 444.67 points (about 7.8%) below its November 4 close of 5,683.80.

Sources: Financial News (Nov 5), Yonhap (Nov 6), Asia Economy (Nov 10). The Nov 4 and Nov 9 closes, and the point changes for Nov 6 and Nov 9, are calculated from the following day's close and change.

Measured from the intraday high of 5,300.92, the index had retraced about 42% of the decline, but gains narrowed in the afternoon. Blockmedia attributed that to caution ahead of this week's U.S. consumer price index (CPI) report and earnings from AI companies. To get back to the November 4 level, the KOSPI would need to climb roughly another 8.5%.

Who bought and who sold on the KOSPI rebound day

According to Asia Economy's tally for the main board on November 10, individual investors were net sellers of about 1.3414 trillion won (roughly $1.0 billion at the day's exchange rate), while foreign investors were net buyers of about 369.6 billion won and institutions net buyers of about 488.9 billion won. Net buying means purchases exceeded sales. Preliminary figures for foreign net buying vary by outlet, from 353.2 billion to 369.6 billion won; this article uses Asia Economy's number.

Han Ji-young, a strategist at Kiwoom Securities (KOSPI: 039490), told Digital Today that the recent drop was comparable to past major crises, and that a habit of treating every bounce as a chance to sell is weighing on sentiment. Retail net selling on the 10th was larger than foreign and institutional net buying combined (about 858.5 billion won). In Gist 7's view, that selling volume, more than the fact that foreigners bought, was the defining feature of the session.

The foreign buying was also small. According to M Economy News, foreign investors sold a net 1.7929 trillion won per day on average over the seven sessions from October 30 to November 9. Over seven sessions that comes to about 12.5 trillion won (Gist 7 calculation), so the 10th's purchase was roughly 3% of it. Lee Kyung-soo of Hana Securities (unlisted; parent Hana Financial Group, KOSPI: 086790) said foreign selling has persisted for more than 10 months and become entrenched, and that a return to net foreign buying may come only "at least three months" from now (M Economy News).

The dollar-won rate jumped 14.5 won in one day to 1,356.6 won at 3:30 p.m. on November 6 (Yonhap). It then fell for two days, to 1,347.1 won on the 9th and a day-session close of 1,337.5 won on the 10th, below its level on the 5th before the spike. The shift to foreign net buying and a sharp drop in oil (WTI at $86.85 a barrel, down 4.38%, per Asia Economy) may both have played a part on the 10th. But the won also strengthened on the 9th, when foreigners were still selling, so equity flows alone do not explain the move.

How to judge whether the KOSPI has bottomed

One day of gains is not enough to tell. Gist 7 uses the four thresholds below to confirm a bottom. They are this article's interpretation, not an official market standard.

Only one of the four, the exchange rate, was met on the 10th. Until it is clear whether foreign buying lasts more than a day, the numbers fit a snapback after a sharp drop better than a confirmed bottom. The first outside test is the U.S. October CPI, due on the night of the 10th Korea time.

How far chips and batteries rose as only big biotech fell

On November 10, SK hynix (KOSPI: 000660) rose 6.69% and Samsung SDI (KOSPI: 006400) gained 9.88%, while Samsung Biologics (KOSPI: 207940) fell 2.78% and Celltrion (KOSPI: 068270) dropped 3.33% (Asia Economy, Newsis).

According to M Economy News, the Philadelphia Semiconductor Index rose 6.86% on November 9 (U.S. time). The index tracks major chip companies listed in the United States. Among individual names, Advanced Micro Devices (Nasdaq: AMD) jumped 13.26%, Broadcom (Nasdaq: AVGO) 8.78% and Micron Technology (Nasdaq: MU) 6.25%. Nvidia (Nasdaq: NVDA), by contrast, fell 4.27% (Asia Economy). Why Nvidia alone slipped is covered in our piece on the U.S. stock rebound and the Nvidia board probe. Lee Kyoung-min of Daishin Securities (KOSPI: 003540) told Global Economic that worries about an AI investment slowdown had been overdone.

Samsung SDI had closed down 11.32% at 415,000 won on the 9th (Jaekyung Ilbo) before recovering 9.88% on the 10th. Large biotech stocks moved the other way, and we found no report that directly explained why, so this article records the moves without guessing at the cause. By sector, medical and precision instruments (8.53%), machinery and equipment (7.65%), construction (7.15%) and electrical and electronics (5.73%) led the gains (Asia Economy). The previous day's sell-off is laid out in our article on the KOSPI barely holding 5,000.

Market impact map

Little direct impact: U.S. 2-year Treasury, U.S. 10-year Treasury, Dollar Index, gold, oil (WTI), bitcoin, S&P 500, Nasdaq

• Currency exchange and overseas payments: the won strengthened for a second day, making dollars slightly cheaper for Korean buyers. That could reverse if foreign selling picks up again.
• Import prices and fuel: a lower dollar-won rate tends to push down the won price of imports in Korea. How this overlaps with the oil slide (WTI at $86.85 a barrel, -4.38%, Asia Economy) is covered in our article on falling oil and Korean gasoline prices.
• Pensions and funds: Korean equity funds diverged on the same day depending on their holdings. Products heavy in Samsung Electronics (+4.74%) and SK hynix (+6.69%) rose with the index, while those weighted toward Samsung Biologics (-2.78%) and Celltrion (-3.33%) gained less. Each fund's sector mix is listed in the manager's monthly report.

Market reactions can vary with other factors, and this table is not a basis for investment decisions.

What to watch next

Dates are based on the U.S. Bureau of Labor Statistics, company announcements from CoreWeave and Nvidia, Korea Exchange KOSPI 200 options specifications (last trading day = second Thursday of the month, regular session ends at 15:20), and the Bank of Korea's monetary policy meeting calendar. Earnings call times are 5 p.m. U.S. Eastern time converted to Korea time.