The Invesco QQQ Trust (QQQ) closed on December 20th at $518.66, up 0.87%, as the Nasdaq-100 index experienced significant inflows due to its quarterly rebalancing. The reconstitution of the Nasdaq-100, which included the addition of companies like Palantir Technologies and MicroStrategy, drove substantial trading activity, with the QQQ seeing a volume surge to 207.38% of its average. This reshuffling, which aligns with the index's methodology of including the largest non-financial Nasdaq-listed companies, has a pronounced impact due to the $400 billion in assets pegged to the Nasdaq-100. The anticipation of these changes, coupled with the Federal Reserve's recent rate cut to 4.25-4.5%, has fueled optimism in the tech-heavy index.