COST Options History — April 2026

In April 2026, COST traded between $975.77 and $1033.45. ATM implied volatility averaged 21.4%, placing in the 15.2% IV rank vs the trailing year. The 30-day expected move averaged 6.1%. IV traded above realized volatility by 1.7% (HV 20d: 19.7%). Max pain ranged from $945.00 to $970.00. Net GEX was positive for 7 of 9 trading days. Term structure was in contango for 5 of 9 days. Put/call ratio averaged 1.41.

Notable Days

2026-04-02: Highest Volume — 50,198 contracts
2026-04-09: Largest IV drop — 11.9% change
2026-04-07: Highest IV Rank — 20.8%
2026-04-07: Largest Expected Move — 6.6%

Monthly Statistics

Metric	Avg	Min	Max	Open	Close
Price	$1002.23	$975.77	$1033.45	$998.83	$1004.32
Max Pain	$959.44	$945.00	$970.00	$945.00	$970.00
ATM IV	21.4%	20.2%	22.9%	22.0%	20.7%
Expected Move	6.1%	5.8%	6.6%	6.3%	5.9%
HV 20d	19.7%	14.4%	24.8%	16.5%	24.8%
HV 60d	20.2%	19.2%	21.1%	20.1%	21.1%
IV Rank	15.2%	10.6%	20.8%	17.3%	12.4%
IV Percentile	42.7%	31.0%	53.6%	47.6%	38.9%
Term Structure	0.6%	-0.5%	3.9%	0.5%	3.9%
VWIV	22.6%	20.7%	25.4%	23.2%	21.3%
Skew 25d	2.8%	2.0%	4.3%	3.5%	2.1%
Skew 10d	5.9%	2.2%	9.4%	9.4%	6.0%
Call IV 25d	20.3%	18.7%	21.8%	20.8%	20.0%
Put IV 25d	23.1%	21.4%	25.6%	24.3%	22.1%
Bid-Ask Spread %	19.36	16.53	23.07	20.65	23.07
Gamma HHI	0.04	0.03	0.11	0.03	0.03
Net GEX	111.3M	-69.1M	317.3M	135.1M	90.0M
Net DEX	-2.37B	-4.02B	-1.02B	-2.48B	-2.12B
Net VEX	-24.0M	-24.4M	-23.2M	-24.3M	-24.4M
Div Yield	0.0%	0.0%	0.0%	0.0%	0.0%
P/C Ratio	1.41	0.67	2.25	2.25	0.67
Total Volume	32,827.222	22,460	50,198	26,066	22,460
Total OI	227,163.111	201,502	268,308	203,912	230,227

Daily Data (9 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
2026-04-01	$998.83	$945.00	22.0%	6.3%	16.5%	17.3%	23.2%	3.5%	0.5%	135.1M	-2.48B	-24.3M	2.25	20.65	8,018	18,048	99,926	103,986
2026-04-02	$1009.67	$960.00	22.3%	6.4%	17.0%	18.4%	24.1%	3.0%	0.4%	283.4M	-3.08B	-24.2M	1.08	18.11	24,137	26,061	101,920	111,874
2026-04-06	$1019.16	$960.00	22.3%	6.4%	17.3%	18.5%	25.4%	4.3%	0.0%	145.8M	-3.08B	-24.3M	1.53	17.59	11,236	17,243	96,317	105,185
2026-04-07	$1013.26	$960.00	22.9%	6.6%	14.4%	20.8%	24.7%	2.9%	-0.5%	126.7M	-2.75B	-24.4M	2.04	21.56	8,947	18,290	100,350	111,793
2026-04-09	$1033.45	$960.00	20.2%	5.8%	14.6%	10.6%	20.8%	2.9%	0.0%	317.3M	-4.02B	-23.2M	0.90	16.53	19,151	17,184	106,400	131,018
2026-04-13	$979.94	$960.00	21.5%	6.2%	24.2%	15.4%	22.2%	2.2%	0.1%	-30.6M	-1.24B	-23.5M	1.24	17.18	14,982	18,544	104,788	129,192
2026-04-14	$975.77	$960.00	20.7%	5.9%	24.2%	12.5%	20.9%	2.0%	0.0%	-69.1M	-1.02B	-23.9M	1.95	17.14	14,483	28,272	107,818	135,366
2026-04-16	$985.68	$960.00	20.2%	5.8%	24.3%	10.7%	20.7%	2.1%	0.8%	3.2M	-1.58B	-24.2M	1.01	22.45	14,129	14,260	113,947	154,361
2026-04-21	$1004.32	$970.00	20.7%	5.9%	24.8%	12.4%	21.3%	2.1%	3.9%	90.0M	-2.12B	-24.4M	0.67	23.07	13,449	9,011	95,956	134,271