A large investor apparently believes that gains will be limited in General Growth Properties.
optionMONSTER systems show that 4,741 April 22 calls were bought for $0.45 against previous open interest of 6,329. At the same time, 4,741 May 23 calls were sold for $0.25 in volume far above that strike’s open interest of just 516 contracts in what is clearly a new position.
The trader is rolling the short-call position forward by a month as the April contracts face expiration at the end of next week. This is very likely tied to long shares in covered-call strategy.
— Option Monster