NOV Inc (NOV) 57K contracts of May 20 calls trade

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National Oilwell Varco Inc. (NYSE: NOV) Delayed: 20.28 +0.10 (0.50%)
Previous Close $20.18    52 Week High $38.89 
Open $20.28    52 Week Low $25.74 
Day High $20.62    P/E 3.73 
Day Low $20.06    EPS $5.44 
Volume 1,890,372