Unit Corporation drew upside option activity late Friday ahead of energy drilling company's earnings release in two weeks.

detected activity concentrated at the March 45 contracts, where some 4,000 calls were bought for $2.45. The trades, which included a single print of 2,829, was more than nine times the open interest of 440 contracts and dwarfed the strike's average call volume of just 26 a day for the last month.