COST Options History — December 2025

In December 2025, COST traded between $849.17 and $922.79. ATM implied volatility averaged 21.5%, placing in the 16.8% IV rank vs the trailing year. The 30-day expected move averaged 6.2%. IV traded above realized volatility by 2.1% (HV 20d: 19.4%). Max pain ranged from $870.00 to $920.00. Net GEX was positive for 7 of 22 trading days. Term structure was in contango for 10 of 22 days. Put/call ratio averaged 1.53.

Notable Days

2025-12-12: Highest Volume — 136,398 contracts
2025-12-12: Largest IV drop — 20.4% change
2025-12-04: Highest IV Rank — 35.2%
2025-12-03: Largest Expected Move — 8.8%

Monthly Statistics

Metric	Avg	Min	Max	Open	Close
Price	$877.52	$849.17	$922.79	$912.85	$862.08
Max Pain	$895.23	$870.00	$920.00	$920.00	$870.00
ATM IV	21.5%	17.4%	26.4%	25.4%	18.2%
Expected Move	6.2%	5.0%	8.8%	8.4%	5.0%
HV 20d	19.4%	16.8%	21.3%	17.8%	18.8%
HV 60d	18.5%	18.0%	19.0%	18.1%	18.6%
IV Rank	16.8%	1.8%	35.2%	31.2%	3.2%
IV Percentile	33.4%	0.8%	79.0%	66.3%	2.8%
Term Structure	0.0%	-1.2%	1.7%	-0.6%	0.7%
VWIV	22.4%	17.8%	30.8%	29.6%	19.1%
Skew 25d	0.7%	-1.5%	2.1%	1.1%	0.6%
Skew 10d	1.7%	-0.9%	7.2%	2.7%	1.5%
Call IV 25d	21.4%	17.2%	26.2%	24.5%	17.4%
Put IV 25d	22.1%	18.0%	27.4%	25.6%	18.0%
Bid-Ask Spread %	60.76	37.11	69.64	42.37	67.91
Gamma HHI	0.05	0.03	0.10	0.03	0.04
Net GEX	-26.5M	-188.2M	206.7M	16.7M	-48.0M
Net DEX	83.2M	-2.02B	2.06B	-1.12B	-2.2M
Net VEX	-27.3M	-29.0M	-25.5M	-28.9M	-25.7M
Div Yield	0.0%	0.0%	0.0%	0.0%	0.0%
P/C Ratio	1.53	0.62	3.46	0.86	2.80
Total Volume	62,186.864	23,616	136,398	34,720	43,742
Total OI	307,984	278,130	351,960	278,130	292,812

Daily Data (22 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
2025-12-01	$912.85	$920.00	25.4%	8.4%	17.8%	31.2%	29.6%	1.1%	-0.6%	16.7M	-1.12B	-28.9M	0.86	42.37	18,691	16,029	148,496	129,634
2025-12-02	$920.42	$920.00	25.5%	8.6%	17.5%	31.6%	30.3%	2.1%	1.7%	113.3M	-1.79B	-29.0M	0.62	37.11	17,928	11,163	157,791	133,387
2025-12-03	$922.79	$920.00	25.8%	8.8%	16.8%	32.8%	30.8%	0.7%	-0.4%	152.4M	-2.02B	-28.5M	1.06	49.29	15,586	16,475	160,261	134,839
2025-12-04	$894.05	$910.00	26.4%	7.2%	20.0%	35.2%	25.1%	0.9%	-0.8%	-161.4M	389.0M	-28.1M	0.79	53.85	41,017	32,548	166,108	139,241
2025-12-05	$895.60	$910.00	25.2%	6.9%	19.2%	30.7%	24.5%	0.5%	-0.8%	-132.9M	-18.6M	-29.0M	0.80	62.89	25,065	20,019	176,862	147,474
2025-12-08	$886.75	$910.00	25.9%	7.2%	19.3%	33.0%	25.9%	0.7%	-0.5%	-49.6M	393.1M	-28.4M	0.96	52.05	17,953	17,215	160,122	133,251
2025-12-09	$887.03	$910.00	25.2%	7.1%	19.2%	30.6%	25.2%	0.3%	-0.3%	-49.6M	322.6M	-28.3M	1.16	56.84	10,937	12,679	167,086	139,542
2025-12-10	$874.75	$910.00	25.5%	7.2%	19.7%	31.8%	25.3%	1.2%	-0.6%	-107.7M	1.23B	-27.5M	0.86	61.56	18,337	15,848	170,151	144,042
2025-12-11	$883.72	$910.00	25.3%	7.0%	20.1%	30.8%	24.8%	0.1%	-1.2%	-68.4M	485.0M	-28.1M	0.83	58.16	40,222	33,511	175,636	148,986
2025-12-12	$883.15	$910.00	20.1%	5.7%	19.6%	11.8%	20.7%	0.7%	-0.1%	-104.1M	679.5M	-27.5M	0.84	61.28	74,322	62,076	192,038	159,922
2025-12-15	$860.30	$910.00	19.7%	5.7%	21.3%	10.3%	20.9%	0.3%	-0.1%	-188.2M	2.06B	-26.4M	0.90	62.54	54,518	48,933	166,895	142,376
2025-12-16	$862.03	$895.00	19.8%	5.7%	20.9%	10.5%	19.8%	0.7%	0.0%	-30.2M	890.0M	-27.3M	1.46	63.62	39,874	58,152	188,545	143,172
2025-12-17	$862.75	$885.00	20.0%	5.7%	20.4%	11.3%	19.9%	1.2%	-0.6%	-35.1M	626.7M	-27.5M	2.49	66.62	15,444	38,450	189,879	144,406
2025-12-18	$857.96	$885.00	18.9%	5.4%	20.3%	7.2%	19.1%	1.1%	0.8%	-86.8M	1.12B	-26.7M	3.46	65.20	18,295	63,236	191,564	145,120
2025-12-19	$855.75	$885.00	17.8%	5.1%	19.8%	3.3%	17.8%	0.8%	0.4%	-123.0M	951.3M	-25.8M	1.69	68.28	30,174	50,903	193,932	143,692
2025-12-22	$849.17	$880.00	17.9%	5.2%	19.7%	3.6%	18.5%	1.0%	-0.0%	-83.5M	1.12B	-25.5M	2.68	65.47	21,722	58,186	156,166	124,225
2025-12-23	$853.24	$875.00	17.4%	5.0%	18.8%	1.8%	18.5%	0.6%	0.5%	15.3M	530.5M	-25.9M	1.17	68.46	19,951	23,375	165,625	127,640
2025-12-24	$874.46	$870.00	17.6%	5.0%	20.4%	2.5%	18.3%	1.3%	0.8%	206.7M	-1.71B	-27.2M	2.18	67.78	33,797	73,564	169,838	131,262
2025-12-26	$872.54	$870.00	18.1%	5.2%	19.4%	4.6%	20.1%	0.4%	0.4%	173.1M	-1.54B	-26.8M	1.14	67.40	28,473	32,356	173,260	131,939
2025-12-29	$867.38	$870.00	18.8%	5.3%	19.3%	6.9%	20.2%	0.9%	0.9%	14.7M	-433.9M	-26.2M	2.26	68.30	15,183	34,287	157,898	121,635
2025-12-30	$866.68	$870.00	18.4%	5.1%	19.3%	5.7%	18.6%	-1.5%	0.5%	-5.6M	-337.5M	-26.1M	2.71	69.64	12,910	34,965	161,208	127,690
2025-12-31	$862.08	$870.00	18.2%	5.0%	18.8%	3.2%	19.1%	0.6%	0.7%	-48.0M	-2.2M	-25.7M	2.80	67.91	11,503	32,239	162,758	130,054