Korean stocks rebounded Tuesday, led by gains in the country’s semiconductor heavyweights, as news of U.S. artificial intelligence (AI) company Anthropic’s planned blockbuster initial public offering (IPO) revived investor appetite after a recent pullback. The benchmark KOSPI opened at 5,658.65, up 3.46 percent from the previous close, according to the Korea Exchange. A buy-sidecar was triggered early in the session at 10:13 a.m., temporarily suspending program buy orders for five minutes after the market’s surge breached the volatility threshold. The index remained in positive territory throughout the session, closing at 5,638.34, up 3.09 percent. Foreign investors and institutions were net buyers of 835.9 billion won ($631.05 million) and 418.5 billion won, respectively, while retail investors sold a net 1. 4 trillion won. The rebound followed reports that Anthropic, the developer behind the Claude AI chatbot, had filed a registration statement with the U.S. Securities and Exchange Commission for a proposed IPO. The AI giant is seeking to raise as much as $100 billion, which woul