Symbol	Strike	Price	Change $	Bid	Ask	Volume	Open Interest
CHK130531C00020000	20.00	1.700	+0.00	1.640	1.710	0	6
CHK130531C00020500	20.50	1.130	+0.08	1.200	1.210	73	37
CHK130531C00021000	21.00	0.7200	-0.14	0.7700	0.7900	470	243
CHK130531C00021500	21.50	0.3900	-0.09	0.4300	0.4500	1,018	256
CHK130531C00022000	22.00	0.2000	-0.04	0.2000	0.2100	429	514
CHK130531C00022500	22.50	0.0500	-0.05	0.0800	0.0900	109	262
CHK130531C00023000	23.00	0.0400	+0.00	0.0300	0.0400	84	100
CHK130531C00023500	23.50	N/A	+0.00	N/A	0.0500	0	0

PUT Options - May 31 2013

Symbol	Strike	Price	Change $	Bid	Ask	Volume	Open Interest
CHK130531P00020000	20.00	0.0500	+0.01	0.0100	0.0300	67	64
CHK130531P00020500	20.50	0.0500	-0.04	0.0400	0.0600	518	100
CHK130531P00021000	21.00	0.1300	-0.02	0.1100	0.1300	960	474
CHK130531P00021500	21.50	0.2800	-0.05	0.2700	0.2800	254	364
CHK130531P00022000	22.00	0.5800	+0.03	0.5400	0.5600	52	140
CHK130531P00022500	22.50	1.010	+0.00	0.9000	0.9400	0	51
CHK130531P00023000	23.00	N/A	+0.00	1.340	1.470	0	0
CHK130531P00023500	23.50	1.810	+0.00	1.820	1.870	0	73

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