Ultra Microcomputer (SMCI.US) performance explosion sparks Korean stocks: KOSPI rebounds 2.21% and semiconductors lead the way

According to Woofun AI, the strong financial report issued by US AI server giant SMCI.US (Super Micro Computer) became a key variable in reversing the decline in the Korean stock market, directly driving the Korea Composite Index (KOSPI) to achieve a significant rebound of more than 2% during the opening phase.

This chain reaction, triggered by favorable fundamentals, quickly ignited investment enthusiasm in the semiconductor sector. Block Media reporter Wu Xiuhuan pointed out that the combination of low price absorption due to market panic and sector rotation effects compounded the index to establish a strong upward trend in early trading.

Judging from the real-time trading data disclosed by the Korea Exchange at 9:07 a.m. on the 21st, the Korea Composite Index rose sharply by 122.91 points from the previous trading day, or 2.21%. The current point is 5675.65 points. Looking back at the early trading trend, the index opened at 5666.34 points, then moved rapidly higher, hitting an intraday high of 5675.65 points, while the lowest point fell to 5630.14 points, showing the dominance of the bulls. In terms of capital flow structure, investor behavior showed clear differentiation: individual investors showed a strong desire to go bottom, with a net purchase amount of 51.8 billion won; in contrast, institutional investors and foreign investors remained cautious or profitably settled, with net sales of 47.7 billion won and 232 billion won, respectively.

This kind of buying behavior led by retail investors hedged the pressure on the outflow of institutional capital to a certain extent and provided liquidity support for the steady recovery of the index.

The collective strengthening of weighted stocks is the core engine of the index's rebound. The stock price of Samsung Electronics rose 2.84% to close at 217,500 won; SK Hynix's performance was even more impressive, with an increase of 4.01%, and the transaction price rose to 1272,000 won.

Furthermore, Samsung Square's stock price rose 3.38%, and Samsung Electric rose 2.97%. Although the increase was small, Hyundai Motor also recorded a 0.08% increase to 31,250 won. The direct catalyst for this round of markets came from overnight US stock performance. Although the Dow Jones index rose 1.02% and the Nasdaq index fell slightly by 0.02%, showing a volatile pattern, the quarterly results announced by Ultra Micro completely changed market expectations. Ultra Micro's first-quarter revenue reached $19 billion, far exceeding previous guidance of $145 billion to $15.5 billion. This performance that exceeded expectations drove its share price to soar 15.6% after the market.

According to data compiled by Woofun AI, the performance of ultra-micro companies as key suppliers of AI infrastructure not only validates the continued high level of global AI capital expenditure, but also directly boosted the valuation logic of upstream semiconductor manufacturers through transmission effects through the industrial chain.

Kium Securities researcher Han Zhiying pointed out in this analysis that the excellent performance of ultra-micro companies had significant spillover effects. Semiconductor companies such as Micron (MU.US) and SNDK.US (SNDK.US) all rose by more than 2% in post-market trading. It is expected that the Korean stock market will take this opportunity to gradually repair the previous day's decline.

Notably, there was a subtle shift in foreign investment behavior: from September 28 to October 15, foreign investors net sold Samsung Electronics shares for 12 consecutive trading days, but since October 16, they have switched to net purchases for 3 consecutive trading days.

This reversal in capital flow indicates that foreign investment's selling pressure on large semiconductor stocks is substantially weakening, and market sentiment is shifting from pessimism to cautious optimism. Meanwhile, the Korean tech stock index also followed the market's rise of 11.51 points to 793.48 points, or 1.47%. Within this sector, individual investors made net purchases of KRW 171 billion, institutional investors made net purchases of KRW 10.3 billion, while foreign investors still made net sales of KRW 25.6 billion. In terms of individual stocks, AlteoGen shares rose 4.11% to 24,500 won, EcoProBM rose 3.99% to 109400 won, and Ecopro and LVMC Holdings also rose; in contrast, HLB shares fell 0.58% to 42,750 won, indicating structural differentiation within technology stocks.

In terms of the foreign exchange market, the Seoul foreign exchange market shows that the exchange rate of the won against the US dollar fell by 3.0 won from the closing price of the previous trading day. The current exchange rate is 1325.0 won per dollar. The slight depreciation of the won reflects an adjustment in capital flows. Investors can follow Block Media on Google News or get instant updates on their Telegram channel. The BM data briefing is distributed every morning at 7 a.m., covering Bitcoin, BM20, Fear and Greed Index, ETF fund flows, kimchi premiums, and CLM cryptocurrency analysis, providing market participants with faster and more accurate data interpretation than news.