[Edaily Reporter PARK MIN ] Buoyed by SK hynix’s record-breaking earnings and shareholder return momentum, the KOSPI rose more than 6% during the session, breaking through the 6,000-point mark for the first time in 10 trading days. An explosive rally continues across the market, with the “buy-side sidecar”—which suspends the effectiveness of intraday program buy orders—triggered for the second consecutive day following the previous day.

According to MP Doctor on the 28th, as of 1:19 p.m., the KOSPI index was trading at 6,000.87, up 362.53 points (6.43%) from the previous trading day. This marks the first time in 10 trading days—since October 14—that the KOSPI has surpassed the 6,000 mark during the session; the index surged past the 6,000 level in one fell swoop, reaching an intraday high of 6,022.

At 9:54 a.m. today, the buy-side sidecar was triggered, suspending the effectiveness of buy orders in program trading for five minutes. This marks the second consecutive day the buy-side sidecar has been triggered, following the previous day; the total number of sidecar activations on the stock market this year now stands at 54, comprising 27 buy-side and 27 sell-side triggers.

In terms of supply and demand, foreign and institutional investors are driving the index’s surge with large-scale net buying. As of this writing, foreign investors have net bought 752.6 billion won and institutional investors 1.0153 trillion won, recording a combined net buying position exceeding 1.76 trillion won. In contrast, retail investors are flooding the market with profit-taking and stop-loss orders, resulting in a net selling position of 1.7733 trillion won on their own.

Among the top-market-cap stocks on the KOSPI, record-breaking gains are unfolding, led by large-cap semiconductor stocks. SamsungElectronics(005930)is trading at 241,250 won, up 8.67% (19,250 won) from the previous trading day, while SamsungElectronics(1P)(005935)has surged 10.52% to 189,100 won, posting a double-digit percentage gain.

SK hynix(000660), which today announced its first-ever quarterly revenue of 100 trillion won, operating profit in the 83 trillion won range, and an additional 60 trillion won shareholder return plan—all driven by surging demand for HBM (High Bandwidth Memory)—also soared 9.99% (134,000 won) to 1,475,000 won, approaching the 1.5 million won mark. Holding company SKSQUARE(402340)(up 10.75%), along with Samsung Life Insurance(032830)(up 9.22%) and SamsungElectroMechanics(009150)(up 9.24%), are also maintaining gains of around double digits.

At the same time, the KOSDAQ index is also trading at 768.17, up 24.34 points (3.27%) from the previous trading day. In the KOSDAQ market, institutional investors are net buyers of 121.7 billion won, while retail investors are net buyers of 23.2 billion won; foreign investors are net sellers of 137.8 billion won. The number of rising stocks reached 1,031, including five that hit their daily upper price limit, overwhelming the number of falling stocks (627).

All of the top-ranked KOSDAQ stocks by market capitalization are also showing strength. The leading robotics stock, Rainbow Robotics(277810), is trading at 399,500 won after surging 13.66% (48,000 won) and is attempting to break through the 400,000-won mark during the session.

Buoyed by SK hynix’s strong earnings and shareholder return momentum, semiconductor materials, parts, and equipment stocks are also gaining strong momentum. SIMMTECH Co., Ltd.(222800)(7.42%), WONIK IPS Co.,Ltd. (5.65%), JUSUNG ENGINEERING Co.,Ltd.(036930)(4.81%), EO Technics Co., Ltd.(039030)(4.56%), and LEENO Industrial Inc(058470)(2.61%) are all surging sharply, while leading biotech and secondary battery stocks such as Alteogen Inc.(196170)(2.52%), ECOPRO CO., LTD(086520)(1.75%), ECOPRO BM CO., LTD.(247540)(1.06%), and HLB INC.(028300)(0.88%) are also continuing their upward trend.

Kang Jin-hyuk, an analyst at Shinhan Investment Securities, explained, “Investor sentiment toward AI has improved as Anthropic, following SpaceX—which announced a return to profitability alongside expanded capital expenditures last week—has also demonstrated profitability.” He added, “On the KOSDAQ, capital inflows were seen across large-cap stocks, including secondary batteries, biotech, and robotics, led by materials, parts, and equipment.”