NIO Inc. (NIO) 30-day option implied volatility at 91

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NUVEEN MUNICIPAL OPPORTUNITY FUND, Inc. (NYSE: NIO) Delayed: 3.80 --0 (-0%)
Previous Close $3.80    52 Week High $14.86 
Open $3.80    52 Week Low $13.31 
Day High $3.80    P/E N/A 
Day Low $3.80    EPS $0.00 
Volume 3,405,259