Lidar maker Hesai (HSAI), a BYD supplier, surged after landing an exclusive $40M US robotaxi deal through 2026 and jumping 7.7% in its HK$4.2B Hong Kong debut. Retail chatter spiked, citing the 170x oversubscribed listing and Hesai's 61% global lidar market share. US shares have already doubled YTD, though delisting risks linger. Sentiment on Stocktwits stayed 'bullish' with heavy volume.