Group 1 - The core distinction between "主买" (active buying) and "被买" (passive buying) lies in the initiative of the funds, with "主买" indicating a strong buying intent and "被买" reflecting a defensive accumulation strategy [1][2] - "主买" involves funds actively placing buy orders at or above the seller's price, leading to an immediate upward pressure on stock prices, while "被买" involves funds waiting at the buy price to absorb selling pressure without pushing prices higher [2] - "主买" is considered a positive market signal, indicating that the main funds are optimistic about the stock [3] Group 2 - "被买" may suggest that the main funds are accumulating shares at lower price levels, anticipating future price increases [4]