NIO stock has increased, with some reports indicating a 9% gain, while others suggest a range of increases, including 5%, 7%, and 9.3%. The reasons for the increase and the performance of NIO relative to other electric vehicle stocks, such as Tesla and Rivian, are unclear, with varying reports on the gains of these companies. Some outlets are focusing on NIO's recent deliveries and sales outlook, as well as the overall electric vehicle sector's performance.