COST Options History — May 2025

In May 2025, COST traded between $992.82 and $1048.04. ATM implied volatility averaged 27.0%, placing in the 38.4% IV rank vs the trailing year. The 30-day expected move averaged 7.5%. IV traded above realized volatility by 4.5% (HV 20d: 22.5%). Max pain ranged from $920.00 to $960.00. Net GEX was positive for 20 of 21 trading days. Term structure was in contango for 1 of 21 days. Put/call ratio averaged 0.64.

Notable Days

2025-05-30: Highest Volume — 145,891 contracts
2025-05-30: Largest IV drop — 17.5% change
2025-05-01: Highest IV Rank — 50.0%
2025-05-21: Largest Expected Move — 7.9%

Monthly Statistics

Metric	Avg	Min	Max	Open	Close
Price	$1015.62	$992.82	$1048.04	$1002.43	$1048.04
Max Pain	$936.67	$920.00	$960.00	$955.00	$945.00
ATM IV	27.0%	21.1%	30.2%	30.2%	21.1%
Expected Move	7.5%	5.9%	7.9%	7.7%	5.9%
HV 20d	22.5%	11.9%	37.5%	37.5%	18.4%
HV 60d	30.5%	30.2%	31.2%	31.0%	31.2%
IV Rank	38.4%	17.1%	50.0%	50.0%	17.1%
IV Percentile	78.6%	31.7%	96.8%	96.8%	31.7%
Term Structure	-0.6%	-1.9%	0.9%	-0.9%	0.9%
VWIV	27.3%	21.7%	29.9%	27.2%	21.7%
Skew 25d	4.1%	3.0%	5.7%	5.7%	4.5%
Skew 10d	8.8%	5.2%	12.7%	10.6%	12.7%
Call IV 25d	25.2%	19.4%	28.0%	28.0%	19.4%
Put IV 25d	29.3%	24.0%	33.7%	33.7%	24.0%
Bid-Ask Spread %	59.36	54.91	62.01	54.91	62.01
Gamma HHI	0.05	0.02	0.12	0.05	0.10
Net GEX	146.7M	-22.2M	387.5M	226.8M	275.7M
Net DEX	-3.41B	-5.07B	-2.45B	-3.39B	-5.07B
Net VEX	-27.7M	-29.9M	-25.0M	-29.9M	-25.0M
Div Yield	0.0%	0.0%	0.0%	0.0%	0.0%
P/C Ratio	0.64	0.18	1.10	0.18	0.51
Total Volume	43,493.762	13,464	145,891	76,242	145,891
Total OI	274,494.667	249,477	301,197	280,551	290,041

Daily Data (21 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
2025-05-01	$1002.43	$955.00	30.2%	7.7%	37.5%	50.0%	27.2%	5.7%	-0.9%	226.8M	-3.39B	-29.9M	0.18	54.91	64,488	11,754	127,243	153,308
2025-05-02	$1010.05	$960.00	27.5%	7.0%	37.5%	40.0%	24.2%	5.2%	-0.5%	321.2M	-3.77B	-28.9M	0.37	59.63	44,329	16,267	129,527	156,371
2025-05-05	$1015.66	$920.00	27.8%	7.7%	34.0%	41.2%	28.9%	4.7%	-0.1%	144.6M	-3.61B	-28.4M	1.02	58.69	12,124	12,379	116,343	144,175
2025-05-06	$1011.76	$925.00	28.7%	7.9%	32.4%	44.6%	29.9%	4.8%	-0.5%	130.7M	-3.34B	-29.3M	1.04	56.63	8,382	8,757	119,306	149,292
2025-05-07	$1011.10	$925.00	28.9%	7.8%	32.2%	45.4%	29.5%	5.2%	-0.9%	129.8M	-3.29B	-29.1M	0.65	59.91	9,760	6,388	120,849	153,137
2025-05-08	$1009.32	$925.00	27.9%	7.6%	25.7%	41.6%	28.2%	4.8%	-1.1%	131.1M	-3.27B	-28.7M	0.46	55.35	25,382	11,680	122,442	155,461
2025-05-09	$1008.33	$925.00	27.1%	7.5%	25.7%	38.7%	27.5%	5.1%	-1.3%	136.3M	-3.26B	-28.5M	0.46	59.25	20,885	9,514	125,224	156,728
2025-05-12	$1011.40	$925.00	26.1%	7.2%	25.7%	35.1%	26.9%	3.8%	-0.7%	118.3M	-3.37B	-26.9M	0.69	61.71	20,960	14,540	114,416	145,988
2025-05-13	$1001.99	$925.00	28.0%	7.8%	25.2%	41.8%	27.5%	3.8%	-0.9%	78.6M	-2.83B	-27.8M	0.25	59.60	67,525	17,063	118,467	150,924
2025-05-14	$992.82	$930.00	28.4%	7.7%	25.2%	43.4%	27.7%	4.1%	-1.0%	60.4M	-2.45B	-28.6M	0.42	61.84	21,940	9,126	134,671	156,404
2025-05-15	$1005.99	$930.00	27.0%	7.5%	25.1%	38.4%	26.8%	3.2%	-1.2%	170.3M	-3.31B	-28.1M	0.46	61.24	31,033	14,370	138,076	160,137
2025-05-16	$1026.93	$935.00	26.4%	7.3%	23.0%	36.0%	26.3%	3.0%	-1.9%	387.5M	-4.74B	-27.2M	0.30	61.33	64,779	19,575	138,820	162,377
2025-05-19	$1033.45	$935.00	26.4%	7.5%	14.5%	36.2%	27.5%	3.1%	-0.4%	193.2M	-3.98B	-27.4M	0.33	59.56	34,577	11,468	121,612	140,445
2025-05-20	$1036.08	$940.00	27.4%	7.8%	11.9%	39.8%	28.3%	3.6%	-0.2%	211.9M	-4.14B	-27.4M	0.73	60.90	13,493	9,882	124,249	144,064
2025-05-21	$1028.15	$945.00	27.6%	7.9%	12.1%	40.4%	27.8%	3.4%	-0.3%	161.1M	-3.65B	-27.3M	0.91	59.75	14,488	13,155	124,500	147,733
2025-05-22	$1019.34	$945.00	27.1%	7.8%	12.8%	38.8%	28.0%	3.1%	-0.1%	86.9M	-3.17B	-27.6M	0.84	57.88	9,320	7,831	124,925	149,589
2025-05-23	$1010.52	$945.00	27.2%	7.8%	13.4%	39.1%	28.6%	3.8%	-0.1%	-22.2M	-2.55B	-27.7M	0.95	59.20	14,604	13,852	125,885	150,936
2025-05-27	$1018.26	$945.00	25.0%	7.4%	13.5%	31.2%	26.8%	3.8%	-0.1%	59.7M	-3.00B	-26.0M	0.95	58.17	10,084	9,602	109,665	139,812
2025-05-28	$1016.88	$945.00	25.9%	7.6%	13.0%	34.1%	27.6%	4.2%	-0.5%	47.8M	-2.90B	-26.4M	0.87	59.77	7,184	6,280	113,458	144,887
2025-05-29	$1009.48	$945.00	25.6%	7.4%	13.4%	33.3%	27.3%	3.7%	-0.5%	30.6M	-2.56B	-26.1M	1.10	59.13	23,133	25,525	115,461	147,440
2025-05-30	$1048.04	$945.00	21.1%	5.9%	18.4%	17.1%	21.7%	4.5%	0.9%	275.7M	-5.07B	-25.0M	0.51	62.01	96,752	49,139	128,485	161,556