NIO Inc. (NIO) option implied volatility near low end of range

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NUVEEN MUNICIPAL OPPORTUNITY FUND, Inc. (NYSE: NIO) Delayed: 5.23 --5.23 (-0%)
Previous Close $0.00    52 Week High $14.86 
Open $5.23    52 Week Low $13.31 
Day High $5.23    P/E N/A 
Day Low $5.23    EPS $0.00 
Volume 720,222