COST Options History — August 2017

In August 2017, COST traded between $151.72 and $161.44. ATM implied volatility averaged 17.3%, placing in the 45.2% IV rank vs the trailing year. The 30-day expected move averaged 5.0%. IV traded below realized volatility by 2.9% (HV 20d: 20.2%). Max pain ranged from $155.00 to $155.00. Net GEX was positive for 18 of 23 trading days. Term structure was in contango for 15 of 23 days. Put/call ratio averaged 0.91.

Notable Days

2017-08-24: Highest Volume — 78,949 contracts
2017-08-24: Largest IV spike — 25.2% change
2017-08-24: Highest IV Rank — 68.6%
2017-08-24: Largest Expected Move — 5.8%

Monthly Statistics

Metric	Avg	Min	Max	Open	Close
Price	$156.88	$151.72	$161.44	$159.92	$156.80
Max Pain	$155.00	$155.00	$155.00	$155.00	$155.00
ATM IV	17.3%	15.7%	20.0%	17.1%	17.1%
Expected Move	5.0%	4.4%	5.8%	5.2%	4.4%
HV 20d	20.2%	18.2%	26.2%	19.3%	21.4%
HV 60d	23.0%	22.0%	24.5%	23.6%	24.5%
IV Rank	45.2%	31.8%	68.6%	43.3%	43.4%
IV Percentile	56.6%	29.8%	86.5%	57.5%	54.4%
Term Structure	0.6%	-0.7%	3.0%	0.2%	3.0%
VWIV	17.7%	16.2%	20.5%	18.9%	16.2%
Skew 25d	1.9%	1.6%	2.9%	1.8%	1.8%
Skew 10d	3.8%	2.6%	5.4%	3.5%	3.5%
Call IV 25d	16.8%	15.3%	19.0%	16.7%	15.9%
Put IV 25d	18.7%	17.1%	21.8%	18.5%	17.7%
Bid-Ask Spread %	5.87	2.16	29.89	7.46	11.14
Gamma HHI	0.10	0.06	0.22	0.10	0.10
Net GEX	12.9M	-21.2M	46.8M	42.3M	28.1M
Net DEX	2.1M	-530.8M	402.7M	-405.5M	-109.9M
Net VEX	-5.7M	-6.2M	-5.3M	-6.1M	-5.9M
Div Yield	0.0%	0.0%	0.0%	0.0%	0.0%
P/C Ratio	0.91	0.42	2.23	0.62	0.60
Total Volume	36,704.348	17,938	78,949	41,966	48,475
Total OI	294,595.348	246,633	316,214	299,918	314,685

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
2017-08-01	$159.92	$155.00	17.1%	5.2%	19.3%	43.3%	18.9%	1.8%	0.2%	42.3M	-405.5M	-6.1M	0.62	7.46	25,981	15,985	142,675	157,243
2017-08-02	$161.44	$155.00	17.2%	5.1%	19.5%	44.4%	18.9%	1.8%	-0.3%	46.8M	-530.8M	-6.2M	0.60	6.65	34,653	20,697	144,151	159,160
2017-08-03	$157.84	$155.00	16.9%	4.7%	21.1%	41.6%	17.4%	1.9%	-0.1%	26.6M	-114.1M	-6.0M	0.67	4.76	37,363	24,985	147,659	164,325
2017-08-04	$156.54	$155.00	16.3%	4.8%	20.2%	36.2%	16.6%	1.7%	-0.2%	9.0M	66.9M	-6.0M	0.76	3.88	19,513	14,798	149,345	166,869
2017-08-07	$157.19	$155.00	16.5%	4.9%	18.8%	38.4%	16.9%	1.7%	0.6%	16.0M	-16.1M	-5.8M	0.62	2.78	11,936	7,431	137,824	154,967
2017-08-08	$157.83	$155.00	17.2%	4.8%	18.8%	43.9%	17.2%	1.6%	-0.3%	25.1M	-87.0M	-6.0M	0.55	3.59	17,260	9,454	142,062	156,314
2017-08-09	$156.65	$155.00	17.6%	5.2%	19.1%	47.6%	18.2%	1.9%	0.5%	14.4M	40.2M	-5.8M	0.75	2.46	11,126	8,328	142,842	158,766
2017-08-10	$156.77	$155.00	17.9%	5.3%	18.6%	50.4%	18.5%	1.6%	0.5%	15.2M	48.0M	-5.9M	0.61	3.43	11,152	6,786	144,202	160,125
2017-08-11	$157.00	$155.00	18.0%	5.3%	18.5%	51.1%	18.5%	1.7%	0.5%	7.9M	43.0M	-6.0M	0.42	2.82	17,893	7,482	145,884	160,446
2017-08-14	$157.73	$155.00	16.4%	4.6%	18.5%	37.0%	17.0%	1.9%	0.8%	13.4M	-21.6M	-5.6M	0.76	4.51	17,751	13,498	145,013	156,608
2017-08-15	$157.00	$155.00	17.6%	5.1%	18.2%	48.0%	17.5%	2.0%	-0.7%	9.7M	28.0M	-5.6M	0.60	2.16	20,531	12,389	146,763	155,920
2017-08-16	$159.57	$155.00	15.7%	4.5%	18.9%	31.8%	16.3%	1.8%	0.0%	42.9M	-207.5M	-5.5M	0.73	2.88	25,114	18,267	143,885	157,207
2017-08-17	$158.89	$155.00	17.1%	4.9%	19.0%	43.0%	17.7%	2.1%	-0.1%	29.3M	-111.4M	-5.5M	0.94	4.27	13,132	12,355	144,384	159,510
2017-08-18	$157.43	$155.00	17.4%	5.0%	19.3%	46.0%	17.3%	2.1%	-0.2%	-8.6M	30.5M	-5.4M	1.67	2.82	15,075	25,129	145,397	160,280
2017-08-21	$157.04	$155.00	17.0%	4.9%	19.4%	42.3%	17.3%	2.1%	0.3%	3.0M	67.8M	-5.5M	2.23	3.16	8,387	18,729	114,926	131,707
2017-08-22	$158.76	$155.00	16.2%	4.6%	19.2%	35.9%	16.6%	1.8%	-0.0%	14.5M	-51.4M	-5.4M	1.98	7.50	9,473	18,717	116,620	132,584
2017-08-23	$159.25	$155.00	16.0%	4.5%	19.0%	34.1%	16.5%	1.8%	0.1%	19.9M	-74.4M	-5.5M	1.28	9.12	15,137	19,320	117,941	133,448
2017-08-24	$151.72	$155.00	20.0%	5.8%	26.1%	68.6%	20.5%	2.9%	0.2%	-18.3M	402.7M	-5.3M	1.07	29.89	38,080	40,869	126,463	134,558
2017-08-25	$152.53	$155.00	19.7%	5.6%	26.2%	65.6%	19.7%	2.1%	0.1%	-21.2M	356.9M	-5.7M	0.81	5.41	39,326	31,699	142,490	152,931
2017-08-28	$152.36	$155.00	18.5%	5.3%	22.1%	55.5%	18.9%	2.1%	2.6%	-16.1M	330.4M	-5.7M	0.82	4.08	17,376	14,267	141,193	154,610
2017-08-29	$153.78	$155.00	17.2%	5.0%	22.1%	44.5%	17.4%	1.9%	2.9%	-4.8M	204.1M	-5.8M	1.02	4.47	11,518	11,789	146,108	157,899
2017-08-30	$154.12	$155.00	17.6%	5.0%	21.8%	47.4%	17.3%	1.8%	3.0%	753.7K	160.0M	-5.9M	0.80	5.80	13,868	11,106	148,014	159,690
2017-08-31	$156.80	$155.00	17.1%	4.4%	21.4%	43.4%	16.2%	1.8%	3.0%	28.1M	-109.9M	-5.9M	0.60	11.14	30,269	18,206	152,111	162,574