In September, the market capitalization of numerous technology companies experienced significant growth, largely driven by a Federal Reserve rate cut that generally boosts future profits and cash flows for high-growth firms, alongside sustained excitement surrounding artificial intelligence.

Tesla's (TSLA) market capitalization soared by 22.2% last month, reaching $834.4 billion by the end of September. This increase was propelled by record electric vehicle sales in China during August and the company's plans to roll out its Full Self-Driving (FSD) advanced driver assistance software in both China and Europe.

Oracle Corp's (ORCL) market capitalization rose by 21.3% to $472.2 billion at the close of last month, with the stock hitting record highs due to optimism regarding the company's forecast to exceed $100 billion in revenue by fiscal 2029, driven by AI-driven demand for cloud services.

Meta Platforms Inc's (META) market capitalization increased by approximately 10% to $1.45 trillion, as their shares also reached historic highs, spurred by the introduction of their first working prototype of augmented reality glasses, named Orion, and the launch of new AI features for their services.

Amazon.com Inc's (AMZN) market capitalization grew by 4.4% to $1.95 trillion at the end of last month, while Microsoft Corp's market capitalization saw a 3.2% increase, reaching $3.2 trillion.

Conversely, Eli Lilly and Co's market capitalization declined by 7.7% to $842 billion, and Saudi Arabian Oil Co's market capitalization fell by 3% to $1.75 trillion at the end of last month.