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

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NUVEEN MUNICIPAL OPPORTUNITY FUND, Inc. (NYSE: NIO) Delayed: 4.50 -0.04 (0.88%)
Previous Close $4.54    52 Week High $14.86 
Open $4.47    52 Week Low $13.31 
Day High $4.52    P/E N/A 
Day Low $4.45    EPS $0.00 
Volume 21,657,886