COST Options History — October 2018

In October 2018, COST traded between $217.80 and $236.23. ATM implied volatility averaged 20.6%, placing in the 34.5% IV rank vs the trailing year. The 30-day expected move averaged 6.2%. IV traded below realized volatility by 5.4% (HV 20d: 26.0%). Max pain ranged from $220.00 to $230.00. Net GEX was positive for 21 of 23 trading days. Term structure was in contango for 8 of 23 days. Put/call ratio averaged 0.93.

Notable Days

2018-10-05: Highest Volume — 86,386 contracts
2018-10-26: Largest IV spike — 21.7% change
2018-10-29: Highest IV Rank — 64.0%
2018-10-29: Largest Expected Move — 8.0%

Monthly Statistics

Metric	Avg	Min	Max	Open	Close
Price	$226.89	$217.80	$236.23	$234.52	$229.07
Max Pain	$226.74	$220.00	$230.00	$220.00	$225.00
ATM IV	20.6%	18.2%	25.9%	19.5%	21.4%
Expected Move	6.2%	5.2%	8.0%	6.2%	6.6%
HV 20d	26.0%	15.5%	33.4%	15.6%	33.2%
HV 60d	19.0%	13.6%	22.5%	13.6%	22.5%
IV Rank	34.5%	21.3%	64.0%	28.7%	38.8%
IV Percentile	66.9%	46.4%	96.4%	59.5%	77.4%
Term Structure	-0.2%	-2.1%	1.1%	-0.2%	0.6%
VWIV	21.9%	19.3%	28.7%	21.5%	25.7%
Skew 25d	3.0%	2.3%	4.6%	2.5%	3.6%
Skew 10d	6.4%	4.4%	9.0%	4.9%	7.5%
Call IV 25d	19.7%	17.7%	24.9%	18.2%	20.4%
Put IV 25d	22.7%	20.3%	28.7%	20.7%	24.0%
Bid-Ask Spread %	15.23	4.78	49.51	6.85	8.59
Gamma HHI	0.21	0.09	0.85	0.15	0.11
Net GEX	42.3M	-10.9M	318.6M	27.2M	38.2M
Net DEX	-526.2M	-943.4M	431.9M	-830.1M	-663.2M
Net VEX	-3.3M	-3.9M	-2.9M	-2.9M	-3.6M
Div Yield	0.0%	0.0%	0.0%	0.0%	0.0%
P/C Ratio	0.93	0.45	1.64	0.84	1.40
Total Volume	25,794.348	13,010	86,386	17,043	18,437
Total OI	196,175.13	149,370	232,790	179,881	185,097

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
2018-10-01	$234.52	$220.00	19.5%	6.2%	15.6%	28.7%	21.5%	2.5%	-0.2%	27.2M	-830.1M	-2.9M	0.84	6.85	9,280	7,763	82,795	97,086
2018-10-02	$236.23	$220.00	19.2%	6.1%	15.5%	27.1%	21.7%	2.3%	-0.1%	33.8M	-943.4M	-2.9M	0.95	5.77	13,271	12,658	86,493	100,304
2018-10-03	$232.78	$220.00	19.8%	6.4%	16.4%	30.2%	23.5%	2.5%	-0.1%	18.1M	-738.6M	-3.0M	1.64	4.78	13,452	22,056	90,146	106,190
2018-10-04	$231.57	$230.00	21.3%	6.0%	16.3%	38.6%	20.9%	2.6%	-0.3%	3.8M	-626.2M	-3.2M	0.85	12.25	23,616	20,041	95,168	116,069
2018-10-05	$218.10	$230.00	19.7%	5.6%	24.9%	29.5%	19.9%	2.9%	0.3%	-10.9M	431.9M	-2.9M	1.19	7.36	39,483	46,903	107,512	125,278
2018-10-08	$224.40	$220.00	18.6%	5.7%	27.3%	23.6%	19.4%	2.8%	1.1%	9.5M	-433.0M	-3.1M	1.01	6.23	26,935	27,243	95,566	106,098
2018-10-09	$224.24	$220.00	18.9%	5.7%	27.2%	25.2%	19.6%	2.4%	0.9%	24.2M	-469.5M	-3.3M	0.64	9.58	12,433	7,998	102,864	110,194
2018-10-10	$221.74	$220.00	20.3%	6.0%	27.3%	32.8%	20.4%	2.3%	0.8%	17.8M	-303.5M	-3.5M	0.89	11.13	11,113	9,858	108,269	112,714
2018-10-11	$222.83	$230.00	22.4%	6.4%	27.5%	44.3%	21.6%	4.6%	0.1%	24.3M	-375.7M	-3.5M	0.69	36.94	15,212	10,570	108,854	114,053
2018-10-12	$226.91	$230.00	20.4%	5.7%	27.5%	33.5%	21.1%	3.7%	-0.7%	146.8M	-669.0M	-3.4M	0.62	22.00	13,795	8,565	109,943	114,283
2018-10-15	$224.70	$230.00	20.9%	6.0%	27.2%	36.3%	20.6%	3.4%	-2.1%	15.5M	-441.1M	-3.2M	0.77	49.51	7,789	5,978	92,773	108,610
2018-10-16	$227.66	$230.00	18.2%	5.2%	27.3%	21.3%	19.3%	2.7%	-0.5%	40.0M	-648.1M	-3.0M	0.82	6.53	10,745	8,776	95,882	109,398
2018-10-17	$228.22	$230.00	18.4%	5.3%	27.3%	22.5%	19.6%	2.8%	-0.7%	57.6M	-678.3M	-3.1M	0.86	10.05	6,988	6,022	98,975	112,166
2018-10-18	$228.74	$230.00	19.6%	5.6%	27.3%	28.9%	20.2%	3.1%	-0.3%	73.1M	-709.5M	-3.1M	0.91	10.76	10,580	9,638	100,791	112,977
2018-10-19	$230.17	$230.00	18.9%	5.5%	27.3%	25.1%	20.1%	3.0%	-1.0%	318.6M	-902.8M	-3.1M	0.78	9.24	11,709	9,102	102,893	115,668
2018-10-22	$229.46	$230.00	19.1%	5.6%	27.2%	26.2%	20.1%	2.9%	-0.1%	16.5M	-539.8M	-3.2M	0.45	34.46	16,183	7,213	63,381	85,989
2018-10-23	$228.63	$230.00	19.7%	6.0%	27.2%	29.5%	20.7%	2.6%	0.2%	28.0M	-585.6M	-3.6M	0.76	22.32	11,792	9,004	74,597	87,829
2018-10-24	$226.28	$230.00	21.2%	6.5%	27.3%	37.8%	22.7%	2.9%	-0.3%	21.9M	-491.8M	-3.7M	0.81	29.46	9,162	7,447	79,104	90,139
2018-10-25	$226.96	$230.00	21.1%	6.4%	27.3%	37.4%	22.8%	2.6%	0.2%	29.6M	-524.5M	-3.6M	0.73	14.17	8,633	6,271	84,198	91,056
2018-10-26	$217.80	$230.00	25.7%	8.0%	30.6%	62.7%	28.4%	3.7%	-0.5%	-743.4K	-130.1M	-3.6M	1.48	14.08	10,757	15,957	84,837	92,382
2018-10-29	$220.10	$225.00	25.9%	8.0%	31.0%	64.0%	28.7%	3.9%	-0.2%	9.3M	-253.9M	-3.9M	1.12	11.65	8,164	9,152	81,692	92,545
2018-10-30	$227.47	$225.00	23.3%	7.3%	33.4%	49.4%	26.1%	3.5%	-0.4%	30.0M	-577.8M	-3.7M	1.22	6.62	6,981	8,545	83,347	95,823
2018-10-31	$229.07	$225.00	21.4%	6.6%	33.2%	38.8%	25.7%	3.6%	0.6%	38.2M	-663.2M	-3.6M	1.40	8.59	7,686	10,751	84,612	100,485