沪指逼近3800点，液冷概念退潮，多只牛股跌停

Market Overview - A-shares experienced a significant rise on August 21, with the Shanghai Composite Index nearing 3800 points, although it later turned negative with over 3400 stocks declining and a trading volume of 2.12 trillion yuan [1][3] - The trading volume in the Shanghai and Shenzhen markets has surpassed 2 trillion yuan for seven consecutive trading days, marking only the second occurrence in the last decade [5] Sector Performance - Digital currency stocks surged, with several stocks hitting the daily limit, while oil and gas stocks also showed strength [3] - The liquid cooling server concept stocks faced a sharp decline, with multiple stocks hitting the daily limit down, indicating a market correction [7][10] - The rare earth permanent magnet sector also began to retreat, with significant declines in stocks like Jintian Co. and Beikong Technology [10][11] Foreign Investment Trends - Foreign capital is increasingly entering the Chinese market, with 663 companies disclosing their mid-year reports, and 139 companies seeing significant QFII investments [16] - South Korean investors have increased their holdings in Chinese stocks, with a notable rise in investments in tech and emerging industry leaders such as Xiaomi and Tencent [17][18] Banking Sector - The banking sector showed resilience, with the banking index rising by 0.59% and an overall increase of over 16% year-to-date [13][14] - Regulatory changes are expected to broaden the scope of merger loans, which may further support the banking sector [14]