COST Options History — October 2008

In October 2008, COST traded between $50.93 and $64.69. ATM implied volatility averaged 61.0%, placing in the 67.2% IV rank vs the trailing year. The 30-day expected move averaged 16.7%. IV traded above realized volatility by 1.6% (HV 20d: 59.4%). Max pain ranged from $62.50 to $67.50. Net GEX was positive for 0 of 23 trading days. Term structure was in contango for 4 of 23 days. Put/call ratio averaged 1.96.

Notable Days

2008-10-13: Highest Volume — 43,708 contracts
2008-10-07: Largest IV spike — 32.4% change
2008-10-02: Highest IV Rank — 100.0%
2008-10-24: Largest Expected Move — 20.7%

Monthly Statistics

Metric	Avg	Min	Max	Open	Close
Price	$57.00	$50.93	$64.69	$64.69	$57.01
Max Pain	$63.59	$62.50	$67.50	$67.50	$62.50
ATM IV	61.0%	44.0%	88.2%	44.0%	55.5%
Expected Move	16.7%	12.6%	20.7%	12.6%	15.9%
HV 20d	59.4%	37.7%	77.8%	37.7%	76.4%
HV 60d	45.4%	41.0%	51.0%	41.0%	50.3%
IV Rank	67.2%	44.2%	100.0%	81.9%	51.7%
IV Percentile	97.9%	93.3%	100.0%	99.2%	93.3%
Term Structure	-3.7%	-11.7%	1.4%	-5.4%	1.4%
VWIV	58.6%	42.7%	70.1%	45.4%	64.1%
Skew 25d	14.4%	6.7%	20.2%	6.7%	18.1%
Skew 10d	27.1%	10.2%	40.6%	14.4%	38.2%
Call IV 25d	51.3%	39.7%	62.4%	40.9%	49.5%
Put IV 25d	65.7%	47.6%	80.2%	47.6%	67.6%
Bid-Ask Spread %	16.83	9.16	28.07	10.41	15.69
Gamma HHI	0.15	0.10	0.36	0.11	0.11
Net GEX	-6.1M	-12.1M	-2.9M	-5.3M	-3.5M
Net DEX	331.4M	111.0M	522.4M	111.0M	230.8M
Net VEX	-2.2M	-2.7M	-1.8M	-2.5M	-2.2M
Div Yield	0.0%	0.0%	0.0%	0.0%	0.0%
P/C Ratio	1.96	0.44	5.12	1.92	5.12
Total Volume	19,651	8,331	43,708	11,216	17,805
Total OI	274,082.478	216,856	322,428	261,955	264,361

Daily Data (23 trading days)

Date	Price	Max Pain	ATM IV	Exp Move	HV 20d	IV Rank	VWIV	Skew 25d	Term Str	GEX	DEX	VEX	P/C	Spread %	Call Vol	Put Vol	Call OI	Put OI
2008-10-01	$64.69	$67.50	44.0%	12.6%	37.7%	81.9%	45.4%	6.7%	-5.4%	-5.3M	111.0M	-2.5M	1.92	10.41	3,843	7,373	113,289	148,666
2008-10-02	$61.92	$67.50	56.4%	16.2%	40.2%	100.0%	58.2%	10.8%	-2.6%	-5.6M	207.3M	-2.5M	4.08	17.04	6,475	26,437	114,152	150,074
2008-10-03	$62.60	$67.50	57.3%	16.4%	40.0%	100.0%	58.6%	12.1%	-4.2%	-7.1M	218.9M	-2.7M	2.38	11.85	6,092	14,525	116,221	165,619
2008-10-06	$60.47	$65.00	66.6%	16.6%	41.1%	100.0%	60.5%	12.6%	-10.6%	-8.4M	321.1M	-2.6M	1.36	11.51	7,121	9,686	118,265	173,236
2008-10-07	$57.80	$65.00	88.2%	18.4%	43.3%	100.0%	65.8%	13.9%	-11.7%	-7.3M	387.4M	-2.5M	2.27	21.48	8,398	19,078	121,222	174,945
2008-10-08	$57.06	$65.00	60.5%	16.3%	42.6%	59.0%	57.2%	12.5%	-6.0%	-9.1M	455.6M	-2.3M	1.47	16.79	12,937	19,063	122,390	180,353
2008-10-09	$54.40	$65.00	63.9%	17.5%	43.7%	64.0%	58.5%	11.7%	-7.3%	-7.8M	492.3M	-2.1M	0.91	26.17	4,922	4,461	127,260	177,966
2008-10-10	$53.90	$62.50	68.9%	17.8%	43.7%	71.4%	59.6%	11.3%	-8.0%	-7.2M	504.8M	-2.0M	1.73	19.06	5,326	9,204	127,607	176,133
2008-10-13	$59.52	$62.50	53.3%	13.0%	59.1%	48.4%	42.7%	13.2%	-1.6%	-10.1M	382.2M	-2.3M	2.66	28.07	11,949	31,759	129,015	175,608
2008-10-14	$58.41	$62.50	56.2%	13.8%	59.2%	52.7%	45.9%	10.4%	-2.5%	-12.1M	460.2M	-2.3M	3.63	20.24	4,275	15,511	132,960	189,468
2008-10-15	$53.61	$62.50	61.0%	17.0%	63.5%	59.8%	57.5%	7.4%	-4.5%	-6.7M	522.4M	-1.9M	2.26	20.17	7,014	15,862	134,261	172,314
2008-10-16	$57.79	$62.50	59.8%	17.1%	68.0%	57.9%	59.3%	18.4%	-5.4%	-7.5M	375.0M	-2.2M	0.88	9.16	14,705	12,874	136,365	171,146
2008-10-17	$57.98	$62.50	55.2%	15.8%	67.5%	51.2%	54.0%	17.3%	-2.7%	-10.0M	369.5M	-2.2M	1.67	16.29	6,355	10,587	139,479	176,326
2008-10-20	$58.08	$62.50	50.4%	14.5%	67.1%	44.2%	47.4%	15.3%	-0.9%	-4.2M	234.3M	-2.1M	0.44	19.36	7,025	3,122	88,277	128,579
2008-10-21	$55.86	$62.50	57.4%	16.5%	68.2%	54.4%	54.0%	14.3%	0.7%	-3.8M	261.2M	-2.0M	1.66	17.94	11,619	19,242	90,992	129,731
2008-10-22	$53.55	$62.50	62.8%	18.0%	69.0%	62.4%	65.3%	16.7%	0.4%	-4.3M	335.9M	-2.0M	0.88	20.77	7,435	6,536	97,087	143,908
2008-10-23	$52.21	$62.50	68.9%	19.8%	68.4%	71.5%	65.1%	17.4%	-4.9%	-4.1M	362.9M	-1.9M	2.52	13.12	3,070	7,734	100,487	146,809
2008-10-24	$50.93	$62.50	72.1%	20.7%	68.2%	76.2%	67.5%	17.9%	-2.3%	-3.8M	362.4M	-1.8M	0.90	10.13	4,390	3,941	100,348	146,329
2008-10-27	$51.90	$62.50	71.1%	20.4%	67.9%	74.7%	68.1%	20.2%	-6.9%	-4.2M	366.8M	-1.8M	2.73	14.03	5,534	15,132	100,279	147,324
2008-10-28	$57.48	$62.50	54.2%	15.5%	77.8%	49.7%	63.5%	17.6%	0.4%	-3.2M	224.3M	-2.2M	1.25	14.54	7,138	8,935	102,927	141,110
2008-10-29	$56.88	$62.50	59.3%	17.0%	77.8%	57.2%	58.6%	16.5%	-0.1%	-3.2M	221.6M	-2.2M	0.59	16.94	9,449	5,617	105,802	147,152
2008-10-30	$56.97	$62.50	59.6%	17.1%	76.6%	57.7%	70.1%	18.9%	-0.1%	-2.9M	214.7M	-2.2M	1.66	16.36	4,671	7,746	109,900	148,155
2008-10-31	$57.01	$62.50	55.5%	15.9%	76.4%	51.7%	64.1%	18.1%	1.4%	-3.5M	230.8M	-2.2M	5.12	15.69	2,910	14,895	110,633	153,728