As of September 13, 2022, Nvidia is not officially the world’s most valuable company. The rankings are quite dynamic and fluctuate based on changes in the stock market. As of my current knowledge, Apple Inc. is still one of the highest in terms of market capitalization. However, Nvidia is indeed a rapidly growing tech company, especially considering their pioneering work in graphics processing units (GPUs) and artificial intelligence (AI) technology. Please refer to reliable financial news sources or the companies’ market capitalization for real-time and accurate data.