American depositary shares of Nio Inc. /zigman2/quotes/204905836/composite NIO -0.71% rallied more than 16% Thursday after the Shanghai-based electric-car maker reported second-quarter and June sales above its forecast. Nio said it delivered 3,740 vehicles in June, a 179% increase year-over-year, including 2,476 of ES6s, Nio's small SUV and its most popular vehicle. The company sold 10,331 vehicles in the second quarter, an increase of 191% from the previous-year period. As of June 30, Nio has delivered a total of 46,082 vehicles, with 14,169 delivered in 2020. A close around current levels would be Nio's highest since March 2019 and a fourth straight session of gains for the ADRs.The shares have gained 130% for the year, contrasting with losses of about 3% and 9% for the S&P 500 index /zigman2/quotes/210599714/realtime SPX +0.0091% and the Dow Jones Industrial Average /zigman2/quotes/210598065/realtime DJIA -0.10% . Earlier Thursday, Tesla Inc. /zigman2/quotes/203558040/composite TSLA +1.01% reported standout quarterly delivery and production numbers, mainly relying on the U.S. company's new Shanghai-based factory.