On August 19, A-share benchmarks closed sharply lower across the board, with losses widespread throughout the market. The Shanghai Composite Index settled at 3894.42 points, down 2.40%; the Shenzhen Component Index fell 5.01%; the ChiNext Index dropped 6.26%; and the STAR 50 Index tumbled 6.89%. More than 5,000 stocks declined, with only a handful of defensive sectors managing to stay in positive territory. Turnover remained above 2.4 trillion yuan, indicating significant rotation despite the panic-driven session.

Today's sharp decline was the result of both external and internal factors converging. The primary external trigger was the surge in 30-year U.S. Treasury yields to 5.33%, a nearly 19-year high, which directly pressured the valuation foundation of high-priced global technology assets. Meanwhile, escalating Middle East tensions, with the collapse of talks following the expiration of the U.S.-Iran ceasefire agreement, fueled concerns over shipping risks in the Strait of Hormuz, pushing oil prices higher and intensifying global inflation expectations, further souring risk appetite. Domestically, the AI computing power and semiconductor sectors, which had seen significant gains earlier, accumulated substantial profits that were cashed out in concentrated fashion under the external shock. Additionally, programmatic selling triggered by quantitative strategies after key technical levels were breached amplified the downward volatility.

Despite the severe short-term blow to market sentiment, the medium-to-long-term positive factors remain unchanged. Domestic monetary policy continues to be accommodative, with ample liquidity providing underlying support to the market. This adjustment is more of a technical correction triggered by external macro-pricing disturbances and internal capital structure rotation, rather than a deterioration in fundamentals. As panic sentiment gradually subsides, the market is expected to complete the handover of chips amid volatility. Investors can focus on dividend-paying resource sectors that have demonstrated defensive value during the correction, while closely monitoring the recovery opportunities in the tech sector as valuations return to reasonable levels, maintaining patience and awaiting signs of market stabilization.