(Adds background, share movement) BEIJING, Sept 1 (Reuters) - Chinese electric vehicle (EV) maker Nio Inc on Wednesday cut its delivery forecast for the third quarter this year due to uncertain and volatile semiconductor supplies. Nio cut its delivery forecast for the third quarter to around 22,500 to 23,500 vehicles from a previous 23,000-25,000 vehicles. It delivered 5,880 electric sports-utility vehicles last month, up 48% from a year earlier. Li Auto Inc, which sells extended-range electric vehicles, said it sold 9,433 vehicles last month, up 248% from a year earlier.