NIO Inc. (NIO) call put ratio 3.1 calls to 1 put

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NUVEEN MUNICIPAL OPPORTUNITY FUND, Inc. (NYSE: NIO) Delayed: 3.86 --0 (-0%)
Previous Close $3.86    52 Week High $14.86 
Open $3.79    52 Week Low $13.31 
Day High $3.90    P/E N/A 
Day Low $3.71    EPS $0.00 
Volume 63,010,634