Nio delivered more than 20,000 EVs for the third month in a row.American depositary shares of Chinese electric-vehicle (EV) maker Nio (NIO -8.56%) plunged Thursday after the company announced its July monthly delivery results. Those results weren't bad, but investors wanted more.Nio delivered about 20,500 EVs last month, marking the third straight month the company has surpassed the 20,000 unit delivery threshold. But it was still only about 2% higher than the year-ago period. Nio closed today's trading ses ...