NIO Inc. (NIO) option implied volatility into Nio to hold ES6 launch event

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NUVEEN MUNICIPAL OPPORTUNITY FUND, Inc. (NYSE: NIO) Delayed: 5.21 -0.02 (0.38%)
Previous Close $5.23    52 Week High $14.86 
Open $5.30    52 Week Low $13.31 
Day High $5.33    P/E N/A 
Day Low $5.14    EPS $0.00 
Volume 23,476,549