Group 1 - The core concept of stock bidding is to determine the transaction price through the submission of orders by buyers and sellers, which are matched by the exchange system according to specific rules [2][8] - The A-share bidding mechanism consists of two types: collective bidding and continuous bidding, with the former determining the opening and closing prices and the latter being the price formation method during normal trading [2][4] Group 2 - The opening collective bidding phase occurs from 9:15 to 9:25, divided into two stages: 9:15-9:20 where orders can be withdrawn, and 9:20-9:25 where orders cannot be withdrawn [4][5][14] - The core rule for determining the opening price is based on maximizing transaction volume, where the price that allows for the highest volume of transactions is selected [8][14] Group 3 - The transaction order follows the principles of price priority and time priority, meaning higher-priced buy orders and lower-priced sell orders are executed first, and among orders with the same price, the earlier submitted orders are executed first [9][14] - Continuous bidding allows for real-time pricing and immediate transactions, with stock prices fluctuating with each transaction [10] Group 4 - Key signals for new investors include observing the relationship between the opening price and the previous closing price to gauge market sentiment, monitoring transaction volume during the bidding phase to assess capital interest, and being cautious of price fluctuations during the initial bidding phase to avoid being misled by market manipulation [10][11][12]

Core Insights - The article highlights the complexities of the opening auction process in the stock market, emphasizing the strategic maneuvers of institutional investors versus retail investors during the critical 10-minute period from 9:15 to 9:25 AM [1][2]. Group 1: Auction Phases - The auction period is divided into two phases: from 9:15 to 9:20 AM, where orders can be canceled, and from 9:20 to 9:25 AM, where orders become irrevocable [1][2]. - During the first phase, a high cancellation rate of 40% is noted, indicating potential manipulation by institutional investors who may place large orders to create false price movements [1][2]. - The second phase requires that all buy orders at or above the determined opening price and sell orders at or below that price are executed, with a focus on maximizing transaction volume [2][4]. Group 2: Case Studies - A case study of Ning Shui Group illustrates how institutional investors can manipulate prices by placing large orders and then retracting them, leading to retail investors being trapped at inflated prices [5]. - Another example involves Fengxing Co., where continuous selling created panic, resulting in a higher actual transaction price than displayed, demonstrating psychological tactics in trading [5]. - The case of Huayu Mining shows how sudden large orders can signal strong institutional control, leading to significant price increases [6]. Group 3: Trading Strategies and Indicators - The article discusses the importance of observing order cancellations before 9:20 AM as a signal of potential price movements, while after 9:20 AM, the focus should shift to the changes in unmatched buy and sell orders [10]. - A 5% rule is introduced, where if the auction volume exceeds 5% of the previous day's volume, it indicates institutional involvement, while lower percentages may suggest less credible movements [9]. - The article advises caution against aggressive pricing strategies, as orders that exceed the price limits are deemed invalid, and emphasizes the need for calm decision-making during the auction phase to avoid emotional trading [12][14].

Core Viewpoint - The article emphasizes the importance of understanding the "centralized bidding" trading method in the stock market, comparing it to a bustling market where buyers and sellers interact to determine prices, particularly during the critical opening period of trading [1][3][5]. Summary by Sections Centralized Bidding Mechanism - Centralized bidding can be likened to a large market where buyers submit their highest acceptable prices and sellers their lowest, with the exchange acting as a facilitator to match these orders based on price and time priority [3][5]. - The process is characterized by fairness and transparency, as participants remain anonymous and unaware of each other's orders [3]. Price and Time Priority - Price priority means that buyers willing to pay higher prices are more likely to complete their purchases, while sellers offering lower prices can sell their goods more easily [3]. - Time priority ensures that if two buyers offer the same price, the one whose order arrives first is executed first, making the opening minutes of trading particularly dynamic and revealing of market sentiment [3][5]. Market Dynamics During Opening - The article illustrates the dynamics of centralized bidding by comparing it to a popular food stall, where high demand leads to competitive pricing, and the final transaction price often reflects a compromise between buyers and sellers [5][7]. - It highlights that the opening price established during centralized bidding may not reflect the market's direction once continuous trading begins, as external factors can lead to significant price adjustments [7]. Importance of Centralized Bidding - Understanding centralized bidding is crucial for investors, as it serves as an early indicator of market trends and can help avoid potential losses during the opening phase of trading [7].