Market Performance - The S&P 500 index increased by 3.5% in September, marking its fifth consecutive monthly gain, compared to a 1.9% gain in August [1] Top-Performing Stocks - Warner Brothers Discovery experienced a significant surge of 68.1% in September, attributed to its brand portfolio and plans to split into two entities, alongside rumors of a potential buyout [2] - AppLovin saw a rise of 49.2% in September, with a market value of $243 billion, providing software solutions for app developers and achieving a three-year average annual gain of 233% [3] - Western Digital's stock increased by 46.6% in September, driven by the growing demand for data storage due to cloud computing and artificial intelligence, with several investment banks raising their price targets for the company [4]