[DigitalToday reporter Sang-yeop Oh] The KOSPI, which plunged nearly 9 percent a day earlier, rose more than 6 percent on foreign buying and a rebound in semiconductor shares. The rally was strong enough to trigger a buy sidecar in both the KOSPI and KOSDAQ markets.

On July 15, the KOSPI ended up 427.58 points, or 6.24 percent, at 7,284.41. It opened at 7,082.91, up 226.08 points, or 3.30 percent, from the previous session and climbed to the 7,400 level during the session.

In the main board market, foreigners were net buyers of 2.3227 trillion won and institutions bought a net 182.7 billion won. Retail investors were net sellers of 2.4681 trillion won, following net selling in the 4 trillion won range a day earlier, extending selling for a second straight session as foreigners and institutions absorbed the supply.

The Korea Exchange triggered a buy sidecar in the main board market at 9:06:41 a.m. on Tuesday, temporarily halting the effect of program buy orders.

A buy sidecar was also triggered in the KOSDAQ market as the index jumped early in the session. The effect of program buy orders in the KOSDAQ market was also suspended for 5 minutes.

Most large-cap stocks by market value rose. Samsung Electronics closed up 16,500 won, or 6.27 percent, at 279,500 won.

SK Hynix gained 169,000 won, or 8.83 percent, to 2,082,000 won, reclaiming the 2 million won level. Its American depositary receipts surged more than 27 percent in the U.S. market overnight, which is seen as having lifted investor sentiment toward the local shares.

SK Square jumped 16.13 percent and Samsung Electro-Mechanics surged 12.14 percent. Hyundai Motor rose 2.24 percent, LG Energy Solution added 4.04 percent, Samsung Life gained 6.47 percent, Samsung Biologics rose 1.10 percent and KB Financial Group added 0.89 percent.

The KOSDAQ closed up 45.45 points, or 5.80 percent, at 829.43. The index, which had fallen below the 800 level a day earlier, regained the 820 level in a single day.

The won-dollar exchange rate stood at 1,487.10 won, down 3.90 won, or 0.26 percent, from the previous session. Foreigners' net buying of local stocks and a recovery in risk appetite are seen as having led to won strength.

In the U.S. market overnight, memory chip stocks such as Micron and SanDisk rose, and the U.S. June consumer price index came in below market expectations, easing inflation concerns.

Han Ji-young (한지영), an analyst at Kiwoom Securities, said SK Hynix ADR gains, strength in U.S. semiconductor stocks and relief over inflation influenced the rebound in the local stock market. She said supply-demand volatility could persist, but investors should consider the market path as leaning toward recovery rather than further adjustment and look at AI infrastructure-related stocks such as semiconductors that fell sharply.