Retail investors funneled $11 million into MicroStrategy shares on Monday, nearly three times their average daily inflows this year, following the company's addition to the Nasdaq-100 index. MicroStrategy's stock has surged 550% this year, significantly outperforming Nvidia's roughly 160% gain.  As the largest corporate holder of bitcoin, MicroStrategy has become a "poster child" for tracking bitcoin's price. Bitcoin's recent milestone above $100,000 and Michael Saylor's bullish advocacy have fueled the company’s popularity. Short interest in the stock declined significantly since the start of the year.