COST Options History — January 2026

In January 2026, COST traded between $852.96 and $985.87. ATM implied volatility averaged 20.4%, placing in the 11.2% IV rank vs the trailing year. The 30-day expected move averaged 5.8%. IV traded below realized volatility by 2.0% (HV 20d: 22.3%). Max pain ranged from $870.00 to $930.00. Net GEX was positive for 17 of 20 trading days. Term structure was in contango for 12 of 20 days. Put/call ratio averaged 0.89.

Notable Days

2026-01-08: Highest Volume — 116,069 contracts
2026-01-15: Largest IV drop — 9.1% change
2026-01-30: Highest IV Rank — 17.8%
2026-01-20: Largest Expected Move — 6.1%

Monthly Statistics

Metric	Avg	Min	Max	Open	Close
Price	$940.52	$852.96	$985.87	$852.96	$941.00
Max Pain	$901.00	$870.00	$930.00	$870.00	$930.00
ATM IV	20.4%	18.6%	22.1%	18.6%	22.1%
Expected Move	5.8%	5.2%	6.1%	5.2%	5.9%
HV 20d	22.3%	18.9%	24.7%	18.9%	23.6%
HV 60d	20.1%	18.7%	20.9%	18.7%	20.5%
IV Rank	11.2%	4.7%	17.8%	4.7%	17.8%
IV Percentile	31.7%	5.6%	49.6%	5.6%	49.6%
Term Structure	0.9%	-1.1%	4.3%	0.8%	3.4%
VWIV	20.6%	19.5%	21.8%	19.7%	21.1%
Skew 25d	1.1%	0.3%	2.0%	0.9%	1.1%
Skew 10d	2.8%	-1.2%	8.3%	1.4%	3.0%
Call IV 25d	19.9%	18.3%	21.3%	18.3%	20.1%
Put IV 25d	21.0%	19.2%	22.9%	19.2%	21.2%
Bid-Ask Spread %	57.60	44.15	69.07	69.07	62.57
Gamma HHI	0.07	0.03	0.22	0.09	0.19
Net GEX	164.4M	-192.6M	418.2M	-166.0M	-192.6M
Net DEX	-3.69B	-5.94B	700.3M	700.3M	-1.35B
Net VEX	-26.9M	-27.7M	-24.8M	-24.8M	-27.6M
Div Yield	0.0%	0.0%	0.0%	0.0%	0.0%
P/C Ratio	0.89	0.18	1.49	1.38	1.15
Total Volume	48,499.75	26,326	116,069	56,982	37,887
Total OI	274,087.3	218,346	329,557	295,535	243,149

Daily Data (20 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
2026-01-02	$852.96	$870.00	18.6%	5.2%	18.9%	4.7%	19.7%	0.9%	0.8%	-166.0M	700.3M	-24.8M	1.38	69.07	23,976	33,006	164,594	130,941
2026-01-05	$878.07	$875.00	19.8%	5.6%	19.4%	8.9%	20.1%	1.6%	-0.5%	54.9M	-1.12B	-25.6M	1.36	55.16	22,761	30,855	155,105	125,064
2026-01-06	$892.34	$875.00	20.4%	5.8%	20.3%	11.2%	20.6%	1.8%	-0.3%	127.7M	-2.13B	-26.0M	1.05	53.35	28,892	30,289	159,837	127,583
2026-01-07	$882.55	$870.00	21.0%	6.0%	20.3%	13.6%	21.8%	0.3%	0.2%	120.6M	-1.61B	-26.6M	1.49	58.48	17,267	25,696	168,110	131,624
2026-01-08	$916.74	$875.00	21.0%	5.9%	24.5%	13.7%	21.1%	0.6%	-0.2%	312.0M	-4.44B	-27.0M	0.58	54.15	73,628	42,441	173,801	138,306
2026-01-09	$925.08	$880.00	20.2%	5.7%	23.9%	10.6%	20.6%	0.5%	-0.5%	239.9M	-4.80B	-26.8M	0.58	61.22	41,348	24,009	177,668	142,595
2026-01-12	$943.94	$880.00	20.6%	5.9%	24.5%	12.2%	21.1%	1.5%	0.0%	270.5M	-5.01B	-26.7M	0.77	59.03	28,882	22,328	163,128	131,542
2026-01-13	$938.92	$890.00	20.6%	5.9%	24.7%	12.0%	20.8%	0.8%	0.2%	248.7M	-4.50B	-27.3M	0.77	59.72	18,665	14,278	167,713	140,050
2026-01-14	$952.07	$895.00	21.7%	6.0%	22.4%	16.2%	21.4%	2.0%	-1.1%	326.7M	-5.43B	-27.3M	0.79	61.70	27,450	21,668	171,046	144,672
2026-01-15	$956.42	$900.00	19.7%	5.5%	22.4%	8.7%	19.6%	1.6%	-0.4%	331.6M	-5.68B	-27.3M	1.06	60.19	20,737	21,942	173,039	151,207
2026-01-16	$959.78	$905.00	19.9%	5.6%	22.3%	9.4%	19.9%	0.7%	-0.6%	418.2M	-5.94B	-27.5M	0.81	59.92	23,436	19,089	175,360	154,197
2026-01-20	$964.56	$910.00	21.4%	6.1%	21.9%	15.2%	21.8%	1.5%	-0.3%	188.1M	-4.09B	-27.3M	0.79	58.74	24,997	19,698	118,545	99,801
2026-01-21	$985.87	$915.00	20.3%	5.8%	22.4%	11.1%	20.9%	1.3%	0.6%	270.6M	-5.34B	-26.8M	0.92	53.76	25,765	23,815	124,359	105,822
2026-01-22	$976.34	$920.00	19.8%	5.7%	22.6%	9.0%	20.2%	1.1%	0.3%	235.5M	-4.63B	-27.3M	0.87	58.28	14,095	12,231	127,123	111,091
2026-01-23	$983.54	$920.00	19.6%	5.6%	22.6%	8.2%	20.1%	1.0%	0.2%	286.5M	-5.11B	-26.8M	0.58	56.45	28,843	16,844	129,774	113,826
2026-01-26	$979.69	$925.00	19.4%	5.5%	21.9%	7.8%	19.9%	0.4%	3.5%	157.2M	-4.24B	-26.9M	0.78	48.88	15,497	12,129	121,303	102,194
2026-01-27	$969.66	$925.00	19.5%	5.5%	22.5%	8.1%	19.5%	0.9%	4.3%	100.7M	-3.64B	-27.2M	0.89	44.15	18,221	16,155	124,747	107,423
2026-01-28	$960.09	$930.00	20.1%	5.8%	22.8%	10.3%	20.8%	0.8%	3.8%	20.8M	-3.00B	-27.0M	0.97	65.82	13,964	13,585	127,492	112,534
2026-01-29	$950.83	$930.00	21.6%	5.9%	23.3%	15.7%	20.8%	0.8%	3.9%	-64.0M	-2.41B	-27.7M	0.18	51.32	54,123	9,503	129,668	115,713
2026-01-30	$941.00	$930.00	22.1%	5.9%	23.6%	17.8%	21.1%	1.1%	3.4%	-192.6M	-1.35B	-27.6M	1.15	62.57	17,604	20,283	127,212	115,937