Zynga (ZNGA): An investor bought 10,000 May 9 calls for $1.15 and sold 10,000 contracts each in the May 8 puts for $0.45 and the May 11 calls for $0.40. The position cost $0.30 and will earn more than 500 percent if the stock closes at or above $11 on expiration. ZNGA rose 0.33 percent to $9.14.
Credit Suisse (CS): About 6,700 June 27 calls were bought for $0.35 as investors positioned for upside in the stock. CS fell 3.26 percent to $24.37.
Humana (HUM): Some 6,400 May 90 calls were bought for $1 to $1.35 against open interest of 2,761 contracts. HUM fell 0.42 percent to $88.36.
Chesapeake Energy (CHK): More than 7,000 May 17 puts changed hands in the natural-gas stock, but volume was below open interest. CHK fell 0.11 percent to $18.11.


