The Nasdaq gives the green light for SpaceX to join, but the S&P 500 shuts the door? — Unveiling the mystery of index compilation methodology
According to the methodology for index compilation, the S&P 500 index undergoes quarterly adjustments on the third Friday of March, June, September, and December each year. On the designated effective date of the index adjustment, the index compilation rules trigger mechanical buy and sell orders, and passive funds tracking the index must buy or sell the companies that are newly added or removed. The measurable flow of real funds can often reach tens of billions or even hundreds of billions of dollars.