COST Options History — March 2021

In March 2021, COST traded between $311.69 and $356.87. ATM implied volatility averaged 22.0%, placing in the 9.0% IV rank vs the trailing year. The 30-day expected move averaged 6.4%. IV traded above realized volatility by 2.4% (HV 20d: 19.7%). Max pain ranged from $330.00 to $355.00. Net GEX was positive for 16 of 23 trading days. Term structure was in contango for 19 of 23 days. Put/call ratio averaged 0.55.

Notable Days

2021-03-05: Highest Volume — 112,463 contracts
2021-03-22: Largest IV drop — 9.8% change
2021-03-03: Highest IV Rank — 17.9%
2021-03-03: Largest Expected Move — 9.4%

Monthly Statistics

Metric	Avg	Min	Max	Open	Close
Price	$332.57	$311.69	$356.87	$332.43	$353.43
Max Pain	$338.04	$330.00	$355.00	$355.00	$335.00
ATM IV	22.0%	18.6%	28.1%	26.3%	19.7%
Expected Move	6.4%	5.3%	9.4%	7.6%	5.3%
HV 20d	19.7%	13.9%	24.6%	14.6%	23.8%
HV 60d	17.8%	15.7%	20.2%	16.0%	20.2%
IV Rank	9.0%	2.8%	17.9%	14.9%	9.1%
IV Percentile	28.1%	1.6%	68.7%	63.1%	8.7%
Term Structure	0.4%	-1.5%	2.5%	0.3%	0.5%
VWIV	23.3%	19.4%	33.2%	27.3%	19.4%
Skew 25d	1.1%	-0.1%	2.7%	1.7%	1.2%
Skew 10d	1.7%	-0.2%	5.1%	4.1%	2.1%
Call IV 25d	22.0%	19.4%	27.8%	26.8%	19.4%
Put IV 25d	23.2%	19.9%	30.5%	28.4%	20.6%
Bid-Ask Spread %	56.90	35.27	70.75	57.73	36.89
Gamma HHI	0.07	0.04	0.21	0.05	0.08
Net GEX	29.4M	-109.3M	115.5M	-27.7M	105.1M
Net DEX	66.4M	-1.85B	1.81B	884.9M	-1.63B
Net VEX	-11.6M	-12.5M	-9.9M	-10.3M	-12.2M
Div Yield	0.0%	0.0%	0.0%	0.0%	0.0%
P/C Ratio	0.55	0.34	0.87	0.55	0.45
Total Volume	44,983.13	22,950	112,463	36,367	23,166
Total OI	322,335.217	278,301	359,418	285,935	304,689

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
2021-03-01	$332.43	$355.00	26.3%	7.6%	14.6%	14.9%	27.3%	1.7%	0.3%	-27.7M	884.9M	-10.3M	0.55	57.73	23,396	12,971	148,513	137,422
2021-03-02	$329.76	$355.00	25.6%	7.9%	14.7%	13.7%	28.1%	2.0%	-0.3%	-25.6M	997.9M	-10.3M	0.59	50.36	24,584	14,550	158,249	142,805
2021-03-03	$324.82	$355.00	28.1%	9.4%	13.9%	17.9%	33.2%	2.7%	-0.3%	-33.9M	1.20B	-10.5M	0.82	55.37	34,850	28,678	167,067	150,228
2021-03-04	$319.02	$345.00	26.9%	7.8%	14.6%	15.9%	27.8%	2.3%	-1.4%	-33.8M	1.41B	-10.8M	0.57	60.36	49,560	28,118	183,386	156,958
2021-03-05	$316.95	$345.00	24.4%	7.0%	14.5%	11.7%	25.3%	2.2%	-1.5%	-109.3M	1.81B	-9.9M	0.63	62.11	68,997	43,466	193,723	162,536
2021-03-08	$311.69	$340.00	23.5%	7.2%	14.9%	10.2%	25.7%	0.7%	2.5%	-19.2M	1.57B	-10.1M	0.34	58.93	35,071	11,872	175,093	148,981
2021-03-09	$319.16	$340.00	21.7%	6.7%	17.2%	7.1%	24.5%	2.6%	1.4%	3.7M	1.09B	-11.0M	0.40	59.08	32,667	13,152	185,622	152,339
2021-03-10	$325.42	$340.00	21.5%	6.4%	19.4%	6.8%	23.3%	2.1%	1.0%	46.1M	482.0M	-11.7M	0.44	50.15	38,270	16,833	195,959	155,395
2021-03-11	$329.59	$340.00	22.3%	6.4%	20.2%	8.0%	23.2%	0.8%	0.1%	60.1M	225.8M	-12.0M	0.43	61.10	35,544	15,313	194,601	159,576
2021-03-12	$331.29	$340.00	21.7%	6.4%	20.4%	7.1%	22.8%	2.7%	0.3%	66.2M	120.2M	-12.3M	0.40	64.63	30,454	12,218	198,507	160,911
2021-03-15	$329.08	$340.00	22.3%	6.4%	20.4%	8.0%	22.9%	0.3%	0.3%	18.8M	473.7M	-11.9M	0.63	59.43	30,071	18,977	184,743	153,475
2021-03-16	$327.04	$330.00	21.1%	6.1%	20.1%	6.1%	23.0%	0.4%	0.1%	17.7M	390.2M	-12.1M	0.51	64.27	17,878	9,185	190,854	154,817
2021-03-17	$329.63	$330.00	21.2%	6.1%	19.9%	6.3%	22.2%	0.3%	0.4%	36.1M	158.6M	-12.1M	0.76	70.75	13,064	9,886	193,861	154,095
2021-03-18	$323.63	$330.00	21.9%	6.3%	20.5%	7.5%	22.9%	0.3%	0.5%	-13.5M	614.8M	-11.9M	0.81	59.70	20,390	16,423	195,039	155,571
2021-03-19	$328.50	$330.00	20.6%	5.8%	21.7%	6.9%	21.1%	0.1%	1.0%	32.7M	195.4M	-12.0M	0.87	68.92	20,935	18,111	198,698	157,183
2021-03-22	$333.91	$330.00	18.6%	5.5%	22.5%	2.8%	19.8%	0.5%	0.9%	42.0M	-429.6M	-12.0M	0.51	53.99	26,441	13,574	150,306	127,995
2021-03-23	$340.48	$330.00	19.6%	5.6%	22.5%	5.9%	20.0%	0.1%	0.3%	68.0M	-944.9M	-12.2M	0.51	61.27	29,223	14,958	155,898	130,495
2021-03-24	$339.30	$330.00	19.1%	5.6%	22.4%	5.3%	20.2%	0.5%	0.6%	66.5M	-787.8M	-12.2M	0.43	57.32	19,704	8,526	158,476	133,853
2021-03-25	$347.32	$330.00	20.1%	5.7%	22.9%	8.5%	20.9%	0.9%	0.6%	91.4M	-1.44B	-12.5M	0.40	57.51	31,573	12,760	162,525	137,173
2021-03-26	$349.74	$335.00	19.9%	5.7%	22.8%	8.4%	20.3%	0.7%	1.0%	115.5M	-1.71B	-12.4M	0.39	35.27	30,128	11,612	164,655	139,409
2021-03-29	$356.87	$335.00	20.1%	5.6%	23.5%	9.2%	20.8%	1.3%	0.9%	92.6M	-1.85B	-12.2M	0.60	56.57	24,313	14,692	153,789	132,927
2021-03-30	$349.94	$335.00	20.2%	5.6%	24.6%	10.8%	20.9%	-0.1%	0.9%	76.7M	-1.30B	-12.2M	0.63	46.96	17,497	10,961	157,673	137,640
2021-03-31	$353.43	$335.00	19.7%	5.3%	23.8%	9.1%	19.4%	1.2%	0.5%	105.1M	-1.63B	-12.2M	0.45	36.89	15,988	7,178	163,026	141,663