Trading data from the morning session on August 21 shows the Shanghai Composite Index opened 0.32% lower at 3,891.18 points, while the Shenzhen Component Index dipped 0.27% to 13,935.64 points. The ChiNext Index edged down 0.01% to 3,495.11 points, and the STAR 50 Index slipped 0.22% to 1,649.28 points. By 9:32 AM, only 674 stocks across the two exchanges and the Beijing Stock Exchange were trading higher, with 4,771 declining and 104 remaining flat.

Leading the gains were insurance, precious metals, shipping and ports, oilfield services, natural gas, and large state-owned banks. On the downside, building materials, pharmaceuticals and biotech, agriculture and aquaculture, real estate, media, and diversified sectors led the losses.

All four major A-share indices opened lower on August 21 but with limited declines, as the Shanghai Composite slipped 0.32% and the STAR 50 fell 0.22%, while the Shenzhen Component and ChiNext posted modest drops of 0.27% and 0.01%, respectively. The market displayed a divergence pattern where indices held up relatively well while individual stocks suffered broad declines—only 674 stocks advanced versus 4,771 that fell, translating to a profit-taking ratio of just around 12%. Defensive and cyclical sectors including insurance, precious metals, shipping and ports, oilfield services, natural gas, and large state-owned banks strengthened against the trend, while pharmaceuticals, building materials, agriculture, real estate, and media led the retreat, signaling a rise in risk-averse sentiment among investors.

Overnight, U.S. equities closed lower with the Dow Jones falling 1.32% to 52,759.21 points, while the S&P 500 dropped 0.87% and the Nasdaq slipped 1.00%. The minutes from the Federal Reserve's July meeting leaned hawkish, with nine votes favoring holding rates steady and three supporting a 25-basis-point hike. International oil prices climbed, with WTI crude rising 2.33% to settle at $87.83 per barrel. In Shanghai, the "Eight Measures for Housing" policy was introduced, optimizing purchase restrictions, down payment requirements, and interest rate policies. The Loan Prime Rate (LPR) was announced on August 20, with the 1-year rate at 3.00% and the 5-year-and-above rate at 3.50%, marking the 15th consecutive month of no changes. Additionally, the State Council Information Office is scheduled to hold a briefing at 10 AM on August 21 where Vice Minister of Finance Liao Min will discuss the role of proactive fiscal policy.

In corporate developments, Hengrui Medicine received approval for its Class 1 new drug and announced plans to repurchase shares worth 1 to 2 billion yuan. CanSino Biologics obtained a registration certificate for its adsorbed tetanus vaccine. The merger cases involving CICC's share swap to absorb Dongxing Securities and Xinda Securities are scheduled for review on August 27. Several companies in the semiconductor equipment and electrolyte sectors posted significant year-on-year growth in interim net profits.

Looking at the market outlook, all three major A-share indices opened lower with limited declines, as only 674 stocks advanced against 4,771 decliners, keeping the profit-taking ratio below 20% and highlighting the "indices resilient, stocks weak" divergence. Sectors like pharmaceuticals, building materials, and agriculture led the decline, while defensive and cyclical sectors such as insurance, precious metals, shipping and ports, oilfield services, natural gas, and large state-owned banks strengthened against the trend, indicating that risk appetite is narrowing. Overnight weakness in U.S. equities, the hawkish Fed minutes, and rising oil prices are all weighing on global risk sentiment. Institutional consensus leans toward expecting short-term market consolidation, with the interim earnings reporting season likely to shift focus back to fundamentals. The technology sector is showing a pattern of separating genuine from speculative plays with internal divergence, and directional opportunities await further confirmation from incremental capital flows.