The AI boom is reshuffling the global stock market pecking order, with South Korea and Taiwan emerging as surprise contenders. These markets have surged past established Western bourses, a testament to the power of the semiconductor supply chain. Taiwan now ranks as the world's sixth-largest stock market, a remarkable rise from its 12th position in 2004. South Korea has similarly climbed to eighth place, surpassing the U.K. This rapid ascent is driven by the extraordinary concentration of capital into AI-linked firms, with TSMC and Samsung Electronics dominating their respective markets. However, this concentration also raises concerns about vulnerability to market reversals and the potential for concentration risk in Asian portfolios. The AI hardware theme is clearly the catalyst, creating a supply shortage and driving pricing power for chipmakers. Yet, this dynamic also underscores the delicate balance between market growth and stability, as evidenced by the recent fluctuations in South Korean equities. As the AI boom continues, the global stock market hierarchy will undoubtedly continue to evolve, with South Korea and Taiwan at the forefront of this transformative shift.