Petroleo Brasileiro (PBR, news, chart, volatility) calls are seeing an uptick in activity. Recent trades include a multi-exchange sweep of 4,200 Jan 25 calls on the offer for $1.30. 5,000 have traded total and call volume is outpacing put activity by a ratio of four-to-1. Shares are up 58 cents to $24.31 after crude oil gained $3.00 to $42.03.