NIO (NIO) Allows Customers to 'Lock In' ES7 Orders

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NUVEEN MUNICIPAL OPPORTUNITY FUND, Inc. (NYSE: NIO) Delayed: 3.21 -0.11 (3.31%)
Previous Close $3.32    52 Week High $14.86 
Open $3.26    52 Week Low $13.31 
Day High $3.27    P/E N/A 
Day Low $3.16    EPS $0.00 
Volume 34,872,466