Nio's stock has risen, with some reports indicating a 5% or 7% or 9% increase, while Tesla's stock has stalled or dropped, with reports of a 3% or 7% decline. The change in stock prices may be related to delivery updates from the companies, with Nio reporting strong delivery numbers, including a 62% increase in May deliveries. The developments have intensified the rivalry between the two electric vehicle companies, with some outlets also considering the performance of other chinese ev makers like Li Auto and Xpeng.