NIO Inc. stock rose in premarket trading on news of its upcoming Firefly sub-brand launch and new images of its luxury ET9 sedan. Firefly, targeting young urban consumers with premium smart EVs, launched its WeChat account, mini-program, and app. The ET9, priced at RMB 800,000, will begin deliveries in Q1 2025. Both will be showcased at Nio Day 2024.