In the after-hours market that opened on November 5, 2026, after the KOSPI plunged more than 5%, large-cap stock prices are moving at nearly the same levels as the regular session.

A comparison of 30 stocks that ranked in the top 100 by trading value on both the Korea Exchange (KRX) and Nextrade (NXT) showed that 9 stocks traded higher in the NXT after-hours market than in the regular session, while 6 traded lower. The remaining 15 stocks were at the same price as the regular session, and even the largest price difference was only 0.33%.

The KOSPI ended the regular session at 5,383.80, down 300.00 points (5.28%) from the previous trading day, while the KOSDAQ fell 36.54 points (5.11%) to 678.41. The KOSPI 200 dropped 5.79%, with large caps falling more steeply. On the KOSPI, foreigners net sold 3.4031 trillion won, while individuals and institutions net bought 2.2773 trillion won and 848.5 billion won, respectively. Declining stocks numbered 537 on the KOSPI and 1,292 on the KOSDAQ, far outnumbering advancing stocks (344 on the KOSPI, 380 on the KOSDAQ). The direct cause of the plunge could not be confirmed from this market data.

Trading after the regular session continues in the KRX after-hours market (4 p.m. to 8 p.m.) and the NXT after-hours market (3:40 p.m. to 8 p.m.).

Looking at NXT prices around 5:20 p.m., stocks trading higher than the regular session are concentrated in biotech and semiconductors.

Samsung Biologics traded at 1,507,000 won, 5,000 won (0.33%) above its regular-session close of 1,502,000 won, the largest gain among the compared stocks. Alteogen rose 0.24%, from 211,500 won to 212,000 won.

Large-cap semiconductor stocks rebounded slightly after the regular-session plunge. Samsung Electronics rose 500 won (0.25%) to 203,500 won from 203,000 won, narrowing its daily decline from 6.88% in the regular session to 6.65%. SK Hynix was 0.08% higher at 1,275,000 won from 1,274,000 won. PCB maker Simmtech rose 0.10% to 102,800 won from 102,700 won, but remains down more than 16% from the previous day. Samsung Electro-Mechanics and Hanmi Semiconductor stayed at their regular-session prices.

Secondary battery and power equipment stocks were mixed. LG Energy Solution rose 0.14% to 346,500 won from 346,000 won, Doosan Enerbility rose 0.10% to 49,250 won from 49,200 won, and LS ELECTRIC rose 0.08% to 130,900 won from 130,800 won. On the other hand, Hyosung Heavy Industries fell 0.06% to 1,803,000 won from 1,804,000 won, and POSCO Future M fell 0.06% to 175,500 won from 175,600 won. Samsung SDI and EcoPro showed no change.

Stocks trading below their regular-session prices were clustered in autos, public enterprises, and shipbuilding. Korea Electric Power fell 0.16% to 31,100 won from 31,150 won, the largest decline. Hyundai Mobis was 0.14% lower at 360,000 won from 360,500 won, Kia was 0.10% lower at 100,000 won from 100,100 won, and Hanwha Ocean was 0.10% lower at 49,150 won from 49,200 won. Hyundai Motor, in the same auto sector, held at 292,000 won, the same as the regular session.

While current price differences were small, intraday price ranges differed considerably between the two markets. Hyosung Heavy Industries' NXT high of 2,018,000 won was 58,000 won above its regular-session high of 1,960,000 won. LG Energy Solution (NXT 369,000 won vs. regular session 357,500 won), LS ELECTRIC (150,700 won vs. 145,600 won), Doosan (871,000 won vs. 842,000 won), and Korea Circuit (79,000 won vs. 73,500 won) also saw higher NXT intraday highs than in the regular session. SK Hynix's NXT high of 1,381,000 won was 61,000 won above its regular-session high of 1,320,000 won. Semiconductor and power equipment stocks that fell sharply appear to have started at relatively less-depressed prices on NXT.

Conversely, biotech stocks that rose in the regular session saw lower NXT intraday lows. Hanmi Pharmaceutical's NXT low of 427,000 won was 13,000 won below its regular-session low of 440,000 won. SK Biopharmaceuticals (81,200 won vs. 83,900 won), Alteogen (204,500 won vs. 209,500 won), and Celltrion (201,000 won vs. 206,000 won) showed the same pattern. These stocks appear to have started weakly and expanded gains during the regular session. Minute-by-minute data would be needed to confirm when the highs and lows occurred.

Combining trading value from both markets to calculate NXT's share showed large differences by stock. OCI Holdings (54.1%) and Hanjin Kal (53.8%) had higher NXT trading value than KRX. Korea Circuit (49.8%), Alteogen (48.8%), EcoPro (48.3%), Doosan Enerbility (47.3%), and Samsung SDI (46.1%) were also near half. In contrast, LG Energy Solution (24.3%), SK Square (25.1%), Kia (25.1%), and Hyundai Mobis (25.6%) had NXT shares of only about a quarter. Samsung Electronics and SK Hynix, the top two by market capitalization, stood at 34.5% and 35.4%, respectively.

As the after-hours market operates until 8 p.m., current prices may change before the close. Three factors to watch are: whether the slight rebound in large-cap semiconductor stocks holds until the after-hours close; whether Samsung Electronics and SK Hynix open above their regular-session prices in the next day's 8 a.m. NXT pre-market; and whether the large-scale net selling by foreigners continues on the next trading day.

[PSK Holdings and Gaon Cable Recover Small Part of Losses After Market Close; Hanwha Systems and Woori Financial Group Lag Regular Session]

Some semiconductor equipment and cable stocks that plunged in the regular session on November 5, 2026, are rebounding slightly in the NXT after-hours market. Meanwhile, some financial, defense, and construction stocks are trading below their regular-session prices. This is based on a comparison of 10 stocks among those ranking in the top 100 by trading value on both KRX and NXT whose after-hours prices differed from the regular session.

The regular session ended with the KOSPI down 5.28% and the KOSDAQ down 5.11%. On the KOSPI, foreigners sold 3.4031 trillion won worth of shares, while individuals and institutions bought.

The stock with the largest gain over the regular session was PSK Holdings, which rose 500 won (0.36%) to 138,300 won on NXT from 137,800 won in the regular session. Its daily decline narrowed from 19.08% to 18.79%, but its one-day drop remains close to 20%. Its NXT intraday high of 169,100 won was 8,000 won above the regular-session high of 161,100 won. Rino Industrial, another semiconductor parts stock, also rose 0.20% to 51,100 won from 51,000 won, with its NXT high of 56,100 won exceeding the regular-session high of 54,300 won. In contrast, foundry company DB HiTek fell 0.12% to 85,200 won from 85,300 won, widening its daily decline from 11.70% to 11.80%. Even within the semiconductor sector, directions diverged after the market close.

Cable maker Gaon Cable rose 0.24% to 208,500 won from 208,000 won, narrowing its daily decline from 14.23% to 14.02%. Combining trading value from both markets, its NXT share was 44.7%, the highest among the compared stocks.

Secondary battery materials stocks varied. L&F rose 0.12% to 84,000 won from 83,900 won, with a high NXT share of 41.0%. LG Chem fell 0.20% to 244,000 won from 244,500 won. Its regular-session decline of 1.01% was modest, but widened to 1.21% in the after-hours market.

[The after-hours market operates until 8 p.m., so current prices may change before the close. AI assisted with parts of this report.]