Options Skew Analytics

CASY option chain

Strikes around the forward, as they were quoted at the close

Data as of 22 September 2026 (end of day)

2026-10-16(24 days)ATM 30.97%±46.67skew -1.54
CallsStrikePuts
VolumeOpen intBidAskIV IVBidAskOpen intVolume
01$103.40$112.00—$480.00—————
33$84.80$92.10—$500.00—————
22$67.10$72.90—$520.00—————
02$56.60$64.20—$530.00—————
—————$540.0033.14%$3.30$4.704664
511$40.90$47.50—$550.0031.15%$4.30$6.004012
11$33.00$38.00—$560.00—————
58$27.00$32.60—$570.0032.00%$10.40$12.302914
325$20.80$25.70—$580.0030.73%$12.90$16.503014
1818$16.20$18.8030.97%$590.00—$18.00$21.50353
2049$11.90$14.7031.01%$600.00—$24.00$28.30493
1336$10.40$11.3032.78%$610.00—$30.00$35.80190
36173$7.60$8.4032.68%$620.00—$38.10$43.001391
1467$4.90$6.4032.32%$630.00—$44.40$51.201541
7130$3.50$5.1033.11%$640.00—$53.70$60.60270
29161$2.80$3.6033.68%$650.00—$62.00$70.10211
—————$660.00—$71.40$78.80500
—————$670.00—$80.90$87.00202
—————$680.00—$90.60$96.801710
—————$690.00—$100.50$106.80160
—————$700.00—$110.30$118.50359

Forward $587.74. The 25-delta put carries -1.54 volatility points over the 25-delta call.

2026-11-20(59 days)ATM 34.30%±81.27skew +0.37
CallsStrikePuts
VolumeOpen intBidAskIV IVBidAskOpen intVolume
01$98.60$106.00—$490.00—————
03$90.70$97.40—$500.0033.97%$3.10$5.1012121
—————$520.0033.07%$5.60$8.00241
01$58.70$65.20—$540.0033.65%$11.00$12.702111
47$51.20$57.90—$550.0033.74%$14.20$15.70563
08$44.80$51.40—$560.0033.19%$16.60$19.40300
11$40.80$42.90—$570.0033.25%$20.80$23.30666
15$35.60$37.50—$580.0033.46%$25.00$28.50642
2027$31.30$32.5034.35%$590.00—$32.10$33.104323
41107$26.90$27.8034.21%$600.00—$37.00$38.7010523
1221$22.40$24.0033.99%$610.00—$41.20$45.101501
791$19.00$20.4033.99%$620.00—$46.60$51.50522
258$16.20$17.2034.07%$630.00—$53.80$60.50641
316$12.60$14.6033.55%$640.00—$60.30$68.70381
532$10.00$12.2033.28%$650.00—$69.20$76.00390
—————$660.00—$76.40$83.30260
—————$670.00—$84.50$93.504480
017$5.00$6.8032.90%$680.00—$93.10$102.203920
—————$690.00—$102.50$111.10120
—————$700.00—$113.50$120.10160
—————$710.00—$121.40$128.70130

Forward $589.30. The 25-delta put carries +0.37 volatility points over the 25-delta call.

2027-02-19(150 days)ATM 38.09%±145.10skew +0.89
CallsStrikePuts
VolumeOpen intBidAskIV IVBidAskOpen intVolume
—————$470.0036.32%$9.00$10.806827
01$123.20$130.40—$480.0035.50%$9.10$13.20260
—————$490.0037.64%$13.00$17.70441
010$108.50$114.80—$500.0036.42%$14.30$19.003200
—————$510.0036.68%$17.60$21.8030
31$94.00$100.50—$520.0036.92%$21.90$24.204182
04$87.50$94.30—$530.0037.18%$25.60$27.90120
05$81.80$87.90—$540.0036.93%$27.60$32.6081
22$74.90$80.00—$550.0036.74%$31.10$36.50142
01$70.00$75.20—$560.0036.50%$35.10$40.30692
10$65.40$70.40—$570.0036.54%$39.80$44.80198
45$59.10$64.40—$580.0036.53%$44.20$50.0092
112$53.90$59.70—$590.0036.86%$51.10$54.3021
340$49.90$54.6036.78%$600.00—$56.10$59.105712
5311$48.00$52.6038.25%$610.00—$62.50$65.401551
792$41.40$46.6036.64%$620.00—$66.10$70.90211
115$36.40$42.5036.02%$630.00—$71.70$77.30100
119$34.80$38.4036.38%$640.00—$77.80$83.90120
230$27.30$32.5035.93%$660.00—$91.20$98.30260
922$23.10$26.5035.97%$680.00—$106.30$113.0090
32145$18.70$22.3036.03%$700.00—$122.80$128.30290

Forward $594.17. The 25-delta put carries +0.89 volatility points over the 25-delta call.

How to read this

Calls on the left, puts on the right, the strike between them — the layout every chain uses. Each block is one expiration, and the heading carries its days to expiry, the at-the-money implied volatility, and the one-standard-deviation move that volatility implies over that time.

Only the 21 strikes nearest the forward are stored, which is the part of the board that carries the volume. The shaded side is in the money: below the forward for calls, above it for puts.

Implied volatility is shown on the out-of-the-money side only. An in-the-money option is nearly all intrinsic value quoted on a wide market, so a volatility solved from it would look authoritative and mean very little. The price is still shown, because the price is real; the blank is deliberate.