MicroStrategy is set to join the Nasdaq 100 Index on December 23, with an announcement expected on December 13. This inclusion could lead to $2.1 billion in ETF share buying, giving the company a 0.47% weight in the index, making it the 40th largest holding. While joining the S&P 500 may be more difficult due to profitability issues, changes in Bitcoin accounting rules could make it eligible by 2025. Recently, MicroStrategy purchased 21,550 BTC for $2.1 billion, raising its total holdings to 423,650 BTC, valued at approximately $42 billion.