The world’s top EV battery maker pulled off 2025’s biggest IPO. Here’s what to know Rest of World By: Viola Zhou 20 May 2025 at 05:00 China’s CATL, the world’s biggest electric battery maker, starts trading in Hong Kong this week, after a $4.6 billion IPO, the biggest so far this year. CATL has about 38%... © Qilai Shen/Bloomberg via Getty ImagesA launch event for the CATL Bedrock chassis in Shanghai, China, Dec. 24, 2024.