Pony AI Inc. shares rose for a third day in Hong Kong trading, arresting a steep decline since listing three weeks ago, after the robotaxi firm said its Guangzhou operations had broken even on a per-car basis in an early indication its business model is sustainable. The stock rose as much as 6.7% in early trading Wednesday, and were trading at HK$99.85 at 11:20 a.m. local time. Still, the shares are trading well below the HK$139 they fetched in this month’s listing as it vies with rival WeRide ...