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Unusually active option classes on open December 20th

Unusual total active option classes on open include: Patterson-UTI (PTEN), Century Aluminum (CENX), Canaan Inc (CAN), Costamare (CMRE), Nordic American Tankers (NAT), General Mills (GIS), Blink Charging (BLNK), HIVE Blockchain (HIVE), Marvell (MRVL), and MBIA (MBI).

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