Woofun AI reports that the South Korea KOSPI index surged over 5% to reach 6,848.81 points, driven by aggressive capital return plans from SK Hynix and Samsung Electronics. The volatility triggered the South Korean Exchange to activate its Sidecar mechanism, suspending programmed buying orders for the index. In Hong Kong stock markets, leveraged derivatives mirrored the momentum, with the Southern Two Times Long Stock Strategy for Samsung Electronics gaining over 8% and Southern Dongying's SK Hynix Daily Leverage strategy (2x) rising nearly 4%.

The immediate catalyst for this risk-on sentiment stemmed from structural changes in U.S. Treasury market policies. Bessent, the U.S. Treasury Secretary, announced a doubling of buyback sizes for 10-to-30-year Treasury bonds from $2 billion to at least $4 billion to curb yields. Consequently, the yield on 30-year Treasury bonds dropped to 5.18%, while major U.S. indexes closed higher. Matt Maley, chief market strategist at Miller Tabak, noted this intervention signal "could push up the prices of risk assets in the short term." By 10 a.m., foreign investors purchased a net 682.341 billion won, and institutional investors bought 750.326 billion won, offsetting individual investor sales of 1,445.809 billion won.

SK Hynix detailed a substantial shareholder return plan on August 19, committing to buy back and cancel approximately 24.07 million shares over three months. This initiative totals 40 trillion won (about $28.6 billion), representing 3.3% of outstanding shares. The company raised its shareholder return target for 2025 to 2027 to over 50% of cumulative free cash flow, with dividend specifics pending its third-quarter earnings report. SK Hynix cited undervaluation as the rationale, backed by 69 trillion won in net cash held at the end of the second quarter. Park Jun-young of Hanwha Investment & Securities predicted this would drive continuous share reduction, boosting per-share value.

Samsung Electronics simultaneously advanced its pricing and capital allocation strategies amid surging demand. The semiconductor giant reportedly increased prices for new advanced chip manufacturing service orders by up to 15%, extending hikes from memory chips to fabrication services. Samsung indicated it would 'soon' disclose details on its shareholder return policy for the current year and beyond. A board meeting scheduled within August aims to finalize a shareholder return plan worth 100 trillion won (about $71.9 billion), marking the largest such commitment in South Korean corporate history.

The KOSPI index has exhibited extreme volatility this year, characterized by an 'AI memory super cycle' and reforms under the 'Value Enhancement Plan.' The index hit a record high of 9,100 points in June, reflecting gains of over 100% in half a year.

However, concerns over AI capital expenditures and profit-taking triggered a sharp decline from the end of June, with the index dropping over 30% from its peak at the end of July. Despite this correction, the KOSPI maintains an annual gain of over 57%, positioning it among the top-performing global major indexes.

Herald van der Linde, head of equity strategy for HSBC's Asia-Pacific region, argued that the recent correction eliminated excess leverage. He noted that while volatility in South Korean stocks remains high, it has declined from peak levels. HSBC upgraded its rating for South Korean stocks from neutral to overweight, asserting that strong domestic demand should mitigate mechanical selling by foreign investors. This strategic shift reflects confidence in the underlying economic fundamentals despite short-term price fluctuations.

Credit rating agencies and industry analysts reinforce the bullish outlook on SK Hynix. S&P raised SK Hynix's credit rating to 'A-' due to strong business performance driven by artificial intelligence. Chey Tae-won, chairman of the SK Group, warned of 'the worst memory chip shortage' next year, as new production capacity struggles to meet surging demand. TrendForce projects the global HBM market size will grow by 120% year-on-year in 2026, with a supply gap estimated between 15% to 20%.

Woofun AI data shows that memory chip price increases are accelerating across multiple segments. Bank of America surveys indicate NAND spot prices rose by up to 10% in a single week, while 1Tb wafer prices soared by over 500% year-on-year. DRAM spot prices have recorded increases for 18 consecutive weeks, signaling sustained upward pressure. These metrics highlight the intensity of the current supply-demand imbalance in the semiconductor sector.

Paul Mix, head of technology research at Freedom Capital Markets, emphasized that AI-driven demand and long-term customer agreements continue to support industry fundamentals.

However, he cautioned that high valuations and concerns regarding the potential peak of memory chip price cycles are exacerbating short-term volatility. The interplay between robust long-term growth prospects and immediate valuation pressures creates a complex trading environment for investors.

Market participants warn of potential profit-taking pressure following the sharp rally. Third-quarter earnings results, the trajectory of U.S. interest rates, and external disruptions remain key variables that could increase market volatility. This marks a critical juncture where fundamental strength must outweigh macroeconomic uncertainties to sustain the upward trend.