"Passing 4100 next time"... Roller-coaster KOSPI closes at 4086.89

KOSPI on the 30th surpassed the 4100 level for the first time ever, but after a volatile session it gave back some of its gains and closed the day.

On the day, KOSPI closed at 4086.89, up 0.14% from the previous session. KOSPI opened at 4105.95, up 0.61%, and at one point rose to 4146.72, setting a record high. Afterwards, profit-taking poured in, narrowing gains, and it repeatedly went through a 'roller-coaster' session of falling and rising again.

Hyundai Motor, which had surged the previous day after Korea-U.S. tariff negotiations were concluded, closed at 265,000 won, up 2.71%. Hyundai Motor, which had risen by nearly 14% in the after-market the previous day, posted double-digit gains in the early session and renewed its 52-week high, but the momentum was halted by the impact of the earnings released that day.

Hyundai Motor said its third-quarter sales were 46.7214 trillion won. It was the highest third-quarter sales on record. However, operating profit fell by nearly 30% due to the fallout from U.S. tariffs, which affected the stock price.

Kia's stock was the same. It rose to 126,200 won at the open but narrowed gains and closed at 116,200 won, up 0.35% from the previous session.

Samsung Electronics rose intraday to 105,800 won, marking a 52-week high. The stock was pushed up by the announced strong third-quarter results and news that its high-bandwidth memory (HBM) allocation had sold out. The fact that a meeting between Samsung Electronics Chairman Lee Jae-yong and Jensen Huang, CEO of NVIDIA, was scheduled also served as a positive for the stock. On the day, Samsung Electronics closed at 104,100 won, up 3.58% from the previous session.

Reporter Yang Ji-yoon yang@hankyung.com