Three AI-fueled stocks, Nvidia, Microsoft, and Apple, are on the brink of reaching $4 trillion in market value. Nvidia's rapid growth is fueled by the AI arms race, with strong financial results in recent quarters. Microsoft's bet on OpenAI and Azure cloud services positions it well in the AI market. Apple's integration of AI features into its devices, especially the upcoming iPhone models, could drive a significant upgrade cycle. While all three companies have strong potential, Microsoft stands out as a likely frontrunner due to its dominance in enterprise software and AI services. However, Nvidia and Apple could surpass expectations in the near term, with Apple having a good chance of reaching $4 trillion first. Despite long-term challenges for Nvidia, all three companies offer strong investment opportunities, with Apple being more stable and Microsoft having a solid platform for growth.