NIO (NIO) delivers 10k units in January

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NUVEEN MUNICIPAL OPPORTUNITY FUND, Inc. (NYSE: NIO) Delayed: 4.88 +0.04 (0.83%)
Previous Close $4.84    52 Week High $14.86 
Open $4.90    52 Week Low $13.31 
Day High $4.92    P/E N/A 
Day Low $4.80    EPS $0.00 
Volume 18,169,807