COST Options History — August 2023

In August 2023, COST traded between $531.60 and $562.83. ATM implied volatility averaged 18.3%, placing in the 22.0% IV rank vs the trailing year. The 30-day expected move averaged 5.0%. IV traded above realized volatility by 5.6% (HV 20d: 12.7%). Max pain ranged from $535.00 to $550.00. Net GEX was positive for 14 of 23 trading days. Term structure was in contango for 14 of 23 days. Put/call ratio averaged 1.01.

Notable Days

2023-08-21: Highest Volume — 32,310 contracts
2023-08-17: Largest IV spike — 10.2% change
2023-08-17: Highest IV Rank — 29.2%
2023-08-17: Largest Expected Move — 5.7%

Monthly Statistics

Metric	Avg	Min	Max	Open	Close
Price	$549.85	$531.60	$562.83	$555.26	$550.33
Max Pain	$540.00	$535.00	$550.00	$550.00	$535.00
ATM IV	18.3%	16.8%	19.9%	16.8%	19.1%
Expected Move	5.0%	4.1%	5.7%	4.8%	4.1%
HV 20d	12.7%	9.7%	15.1%	14.1%	15.1%
HV 60d	14.6%	13.2%	15.5%	14.9%	13.9%
IV Rank	22.0%	14.8%	29.2%	14.8%	25.6%
IV Percentile	19.7%	14.7%	27.0%	14.7%	23.0%
Term Structure	0.7%	-0.5%	3.5%	-0.2%	-0.0%
VWIV	18.0%	15.0%	20.2%	17.0%	15.0%
Skew 25d	3.3%	2.9%	3.7%	3.3%	3.2%
Skew 10d	6.8%	5.6%	8.2%	7.2%	6.1%
Call IV 25d	17.0%	15.4%	18.5%	15.4%	17.6%
Put IV 25d	20.3%	18.7%	22.0%	18.8%	20.9%
Bid-Ask Spread %	8.28	4.20	12.01	5.70	4.21
Gamma HHI	0.06	0.04	0.30	0.04	0.07
Net GEX	13.0M	-130.5M	116.3M	20.9M	116.3M
Net DEX	-1.01B	-1.79B	125.8M	-1.24B	-1.48B
Net VEX	-11.8M	-12.4M	-11.2M	-12.0M	-11.7M
Div Yield	0.0%	0.0%	0.0%	0.0%	0.0%
P/C Ratio	1.01	0.60	1.63	1.08	0.87
Total Volume	21,975.348	12,995	32,310	15,551	32,232
Total OI	205,842.652	188,346	217,904	199,142	217,904

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
2023-08-01	$555.26	$550.00	16.8%	4.8%	14.1%	14.8%	17.0%	3.3%	-0.2%	20.9M	-1.24B	-12.0M	1.08	5.70	7,493	8,058	88,451	110,691
2023-08-02	$551.68	$550.00	18.3%	5.3%	14.3%	22.0%	19.9%	3.1%	-0.5%	4.6M	-1.00B	-12.4M	0.82	9.10	12,600	10,346	90,050	112,458
2023-08-03	$558.19	$540.00	17.6%	5.1%	14.6%	18.6%	18.0%	3.0%	-0.3%	69.3M	-1.52B	-12.2M	0.72	11.72	12,184	8,796	95,740	114,018
2023-08-04	$552.75	$540.00	17.8%	5.1%	12.3%	19.8%	18.5%	3.0%	-0.1%	-1.1M	-1.14B	-12.1M	0.90	11.17	11,154	10,047	97,826	115,280
2023-08-07	$557.80	$540.00	17.3%	5.0%	12.5%	17.0%	18.8%	3.2%	0.3%	49.7M	-1.47B	-12.0M	0.60	8.90	10,714	6,416	87,577	108,300
2023-08-08	$557.04	$540.00	17.8%	5.2%	12.6%	19.7%	18.8%	3.3%	0.3%	47.4M	-1.40B	-12.0M	0.84	12.01	7,053	5,942	90,756	110,625
2023-08-09	$559.90	$540.00	17.6%	5.1%	11.4%	18.5%	18.4%	3.5%	0.3%	68.6M	-1.63B	-12.1M	0.92	11.60	8,980	8,236	92,383	112,234
2023-08-10	$561.07	$540.00	17.9%	5.2%	11.4%	20.1%	18.4%	3.5%	0.2%	79.1M	-1.68B	-12.1M	0.87	10.99	13,862	12,106	94,699	113,061
2023-08-11	$562.83	$540.00	16.9%	4.9%	10.7%	15.3%	18.0%	3.1%	0.3%	78.6M	-1.79B	-11.7M	0.93	9.63	12,098	11,231	96,589	115,602
2023-08-14	$561.88	$540.00	17.5%	5.0%	9.7%	18.1%	18.3%	3.3%	0.0%	58.9M	-1.61B	-11.7M	0.99	6.88	9,170	9,077	89,779	109,718
2023-08-15	$559.04	$540.00	18.2%	5.2%	9.9%	21.3%	19.8%	3.5%	-0.0%	38.0M	-1.42B	-12.0M	1.63	9.17	6,241	10,195	92,398	113,174
2023-08-16	$559.40	$540.00	18.0%	5.2%	9.9%	20.6%	18.7%	3.3%	0.0%	35.1M	-1.45B	-11.9M	0.95	9.72	8,575	8,130	93,581	115,964
2023-08-17	$546.67	$540.00	19.9%	5.7%	12.8%	29.2%	20.2%	3.6%	-0.1%	-54.3M	-498.9M	-12.0M	0.79	10.43	17,969	14,227	95,405	118,036
2023-08-18	$544.97	$540.00	19.1%	5.5%	12.6%	25.7%	19.3%	3.5%	0.1%	-130.5M	-474.9M	-12.0M	1.01	9.86	15,165	15,322	98,398	118,386
2023-08-21	$544.83	$540.00	18.6%	5.3%	12.1%	23.3%	19.0%	3.2%	2.9%	-8.1M	-576.5M	-11.7M	0.87	8.41	17,236	15,074	84,626	103,720
2023-08-22	$538.09	$540.00	19.2%	5.5%	12.5%	25.9%	19.2%	3.7%	2.8%	-35.8M	-270.4M	-11.7M	1.10	4.20	9,794	10,795	89,642	107,915
2023-08-23	$540.67	$540.00	18.1%	5.1%	12.7%	20.8%	17.9%	3.4%	3.0%	-32.9M	-403.2M	-11.9M	0.73	5.25	9,273	6,776	91,893	111,445
2023-08-24	$531.60	$540.00	19.5%	5.3%	13.6%	27.6%	18.3%	3.5%	2.8%	-80.0M	125.8M	-11.7M	1.20	7.49	10,405	12,439	93,567	113,734
2023-08-25	$533.40	$540.00	18.0%	4.8%	13.6%	20.4%	15.1%	2.9%	3.5%	-63.0M	-105.8M	-11.3M	1.50	8.34	11,519	17,291	95,839	114,575
2023-08-28	$535.05	$535.00	19.3%	4.6%	13.7%	26.7%	16.0%	3.4%	0.1%	-17.0M	-422.2M	-11.2M	1.07	4.52	8,858	9,436	90,635	108,334
2023-08-29	$542.48	$535.00	19.2%	4.3%	14.6%	26.1%	15.4%	3.3%	-0.0%	26.9M	-873.9M	-11.5M	1.53	5.85	9,682	14,802	93,837	112,861
2023-08-30	$541.63	$535.00	19.5%	4.2%	14.5%	27.7%	15.4%	3.2%	-0.2%	28.3M	-835.7M	-11.4M	1.20	5.19	8,385	10,049	96,319	116,356
2023-08-31	$550.33	$535.00	19.1%	4.1%	15.1%	25.6%	15.0%	3.2%	-0.0%	116.3M	-1.48B	-11.7M	0.87	4.21	17,257	14,975	98,876	119,028