COST Options History — September 2025

In September 2025, COST traded between $914.54 and $979.09. ATM implied volatility averaged 24.7%, placing in the 28.7% IV rank vs the trailing year. The 30-day expected move averaged 6.9%. IV traded above realized volatility by 6.8% (HV 20d: 17.9%). Max pain ranged from $940.00 to $960.00. Net GEX was positive for 9 of 21 trading days. Term structure was in contango for 2 of 21 days. Put/call ratio averaged 0.84.

Notable Days

  • 2025-09-26: Highest Volume — 199,880 contracts
  • 2025-09-26: Largest IV drop — 23.1% change
  • 2025-09-16: Highest IV Rank — 34.6%
  • 2025-09-24: Largest Expected Move — 7.8%

Monthly Statistics

MetricAvgMinMaxOpenClose
Price$950.39$914.54$979.09$938.22$929.13
Max Pain$955.95$940.00$960.00$955.00$940.00
ATM IV24.7%20.0%26.3%24.8%20.2%
Expected Move6.9%5.6%7.8%5.6%5.7%
HV 20d17.9%15.1%20.0%19.1%18.3%
HV 60d15.8%15.2%16.6%15.2%16.6%
IV Rank28.7%11.3%34.6%29.1%12.1%
IV Percentile61.4%24.6%75.4%59.5%27.8%
Term Structure-0.8%-1.9%0.2%-0.6%0.2%
VWIV24.6%20.2%28.2%20.3%20.5%
Skew 25d1.4%0.4%2.4%2.4%0.5%
Skew 10d0.8%-10.4%10.6%-3.6%1.7%
Call IV 25d24.3%19.7%26.3%24.0%20.0%
Put IV 25d25.6%20.4%27.1%26.4%20.6%
Bid-Ask Spread %44.1435.2055.9446.9355.94
Gamma HHI0.040.030.150.030.03
Net GEX-25.8M-500.2M263.7M-124.2M3.6M
Net DEX-777.7M-2.69B1.96B316.9M-866.3M
Net VEX-27.7M-32.0M-26.2M-26.9M-32.0M
Div Yield0.0%0.0%0.0%0.0%0.0%
P/C Ratio0.840.531.780.890.64
Total Volume47,095.85719,709199,88023,61050,605
Total OI282,241.095234,851329,621256,205317,884

Daily Data (21 trading days)

DatePriceMax PainATM IVExp MoveHV 20dIV RankVWIVSkew 25dTerm StrGEXDEXVEXP/CSpread %Call VolPut VolCall OIPut OI
2025-09-02$938.22$955.0024.8%5.6%19.1%29.1%20.3%2.4%-0.6%-124.2M316.9M-26.9M0.8946.9312,52411,086126,957129,248
2025-09-03$948.24$955.0025.2%5.7%19.2%30.7%20.2%2.1%-1.6%-50.2M-430.0M-26.7M0.5553.3915,4658,487131,289134,723
2025-09-04$954.58$955.0024.6%6.7%17.0%28.6%23.6%1.8%-1.0%104.6M-1.13B-27.0M0.8551.0119,45116,600138,824137,476
2025-09-05$963.92$955.0024.6%6.7%17.1%28.3%23.6%1.8%-0.7%263.7M-1.94B-27.1M0.6545.1530,20519,653143,711143,362
2025-09-08$969.11$960.0024.8%6.9%17.2%29.0%24.2%2.2%-0.4%130.0M-1.93B-26.2M0.8839.9713,83012,133133,163130,220
2025-09-09$979.09$960.0025.1%6.9%17.3%30.2%24.5%2.2%-0.7%223.4M-2.69B-26.6M0.6735.2016,57611,029138,879134,853
2025-09-10$955.57$960.0026.0%7.2%19.2%33.4%25.1%1.8%-1.2%-33.5M-722.8M-26.4M0.5336.5425,42613,514140,387137,564
2025-09-11$962.69$960.0025.0%7.0%19.2%29.7%25.3%1.9%-0.7%84.4M-1.33B-27.0M0.5641.0516,2849,054147,271142,068
2025-09-12$969.47$960.0025.1%7.1%19.4%30.1%25.0%2.2%-0.7%216.6M-1.97B-26.5M0.8048.0816,03112,812148,507144,133
2025-09-15$961.85$960.0025.9%7.3%19.5%33.4%26.1%1.7%-1.1%5.4M-1.21B-26.4M1.0041.9214,02514,017135,448135,693
2025-09-16$952.15$960.0026.3%7.5%19.5%34.6%26.5%1.4%-0.9%-106.6M-524.1M-27.0M0.9340.1713,45512,565141,444141,270
2025-09-17$962.41$960.0025.8%7.4%20.0%32.8%26.1%1.1%-0.7%7.3M-1.41B-27.3M0.6051.3812,3057,404145,300146,226
2025-09-18$951.11$960.0026.0%7.5%19.2%33.4%26.5%1.2%-1.4%-154.2M-517.8M-27.2M1.7836.9014,81626,336147,901147,030
2025-09-19$953.40$960.0025.7%7.5%16.8%32.3%26.5%1.0%-1.9%-192.3M-885.4M-27.3M0.8442.7728,68824,149152,294150,071
2025-09-22$942.40$960.0025.3%7.5%16.9%30.9%27.1%0.9%-0.6%-65.2M-306.3M-27.4M1.0135.5924,89825,136117,737117,114
2025-09-23$943.86$955.0026.0%7.8%15.6%33.6%27.6%0.5%-0.8%-72.4M-431.6M-29.1M0.8237.4420,63716,967129,668130,976
2025-09-24$945.00$955.0025.9%7.8%15.6%33.2%28.2%0.4%-0.7%-58.1M-614.5M-30.1M0.9939.5920,49420,197136,304137,752
2025-09-25$942.20$950.0026.0%7.8%15.1%33.4%28.2%0.7%-0.9%-86.2M-383.2M-30.0M0.9239.6544,71041,128142,734146,445
2025-09-26$919.23$950.0020.0%5.7%17.3%11.3%20.2%0.6%-0.1%-500.2M1.96B-27.8M0.9453.46102,87197,009163,233166,388
2025-09-29$914.54$945.0020.0%5.8%17.4%11.4%20.7%0.9%0.2%-137.6M681.1M-29.7M0.8754.8740,78735,654157,617137,899
2025-09-30$929.13$940.0020.2%5.7%18.3%12.1%20.5%0.5%0.2%3.6M-866.3M-32.0M0.6455.9430,81719,788168,326149,558