Home Options ISRGChain

ISRG

Intuitive Surgical, Inc.Close $391.18EOD only

Max Pain

$370.00

Next expiry Aug 21, 2026

Expected Move

±$11.22

2.9% from close

Price Gap

-21.18

Distance to max pain

IV Rank

Middle-high premium

P/C OI

0.86

Slightly call-heavy

Consensus

—

No reports available

Published snapshot: Aug 18, 2026 close

End-of-day snapshot

This page reflects ISRG options positioning from the latest published market-close snapshot. Intraday price and contract changes are not displayed.

Published Snapshot

Aug 18, 2026 close

ISRG Options Chain

Data as of market close Aug 18, 2026

Expiration

Compare calls and puts side by side with OI, volume, IV, and positioning context.

Control Row

Next expiry (DTE 3)

Blank greek cells usually mean usable implied volatility was unavailable for that contract in the market-close snapshot.

Open Interest by Strike

IV Skew

Volume by Strike

Calls

Strike	Last	Bid	Ask	Chg	Vol	OI	IV	Delta	Gamma	Theta	Vega	Rho
180.00	219.00	208.40	215.60	0.00	1	1	367.9%	0.994	0.0001	-0.407	0.006	0.015
190.00	168.38	198.50	205.60	0.00	4	8	347.9%	0.993	0.0002	-0.431	0.007	0.015
200.00	158.45	188.40	195.60	0.00	2	4	322.5%	0.993	0.0002	-0.409	0.007	0.016
210.00	164.38	180.00	185.50	0.00	1	1	337.2%	0.986	0.0003	-0.749	0.013	0.017
220.00	179.20	168.40	175.60	0.00	1	0	281.3%	0.991	0.0002	-0.410	0.008	0.018
230.00	108.79	158.70	165.60	0.00	1	1	269.4%	0.989	0.0003	-0.480	0.010	0.019
250.00	93.67	138.40	145.70	0.00	1	4	227.8%	0.988	0.0004	-0.435	0.011	0.020
260.00	98.00	128.40	135.70	0.00	1	10	210.4%	0.987	0.0004	-0.435	0.012	0.021
270.00	152.25	116.30	125.00	0.00	8	8	265.9%	0.952	0.0011	-1.610	0.036	0.020
275.00	148.20	111.40	120.10	0.00	4	4	257.2%	0.948	0.0012	-1.637	0.038	0.021
280.00	85.70	109.60	114.70	0.00	4	18	180.9%	0.983	0.0007	-0.480	0.015	0.022
285.00	138.62	102.70	108.40	0.00	10	10	205.2%	0.964	0.0011	-0.994	0.028	0.022
290.00	49.85	98.70	105.70	0.00	1	8	166.3%	0.980	0.0008	-0.500	0.017	0.023
300.00	92.25	88.80	95.50	0.00	2	19	148.9%	0.979	0.0010	-0.477	0.018	0.024
305.00	87.25	83.50	90.70	0.00	2	11	139.7%	0.979	0.0010	-0.454	0.018	0.024
310.00	53.88	79.00	85.60	0.00	1	21	137.5%	0.973	0.0013	-0.538	0.022	0.025
315.00	38.70	74.00	80.30	0.00	1	23	125.9%	0.975	0.0013	-0.473	0.021	0.025
320.00	78.74	68.50	74.70	-1.66	6	32	101.3%	0.987	0.0009	-0.233	0.012	0.026
325.00	31.00	63.80	69.70	0.00	1	28	99.9%	0.982	0.0013	-0.300	0.016	0.026
327.50	35.45	61.00	68.20	0.00	1	0	106.0%	0.971	0.0017	-0.448	0.023	0.026
330.00	68.66	58.80	65.30	10.06	1	49	101.1%	0.972	0.0018	-0.426	0.023	0.026
332.50	70.90	57.60	63.10	0.00	5	72	113.3%	0.949	0.0026	-0.735	0.037	0.026
335.00	43.20	54.30	59.60	0.00	1	166	91.5%	0.972	0.0020	-0.382	0.023	0.027
337.50	20.00	52.10	58.20	0.00	1	6	101.9%	0.950	0.0028	-0.655	0.036	0.026
340.00	58.52	48.50	54.70	0.00	2	39	74.9%	0.982	0.0016	-0.232	0.015	0.027
342.50	20.40	46.50	52.70	0.00	6	18	84.0%	0.963	0.0027	-0.440	0.029	0.027
345.00	52.85	43.30	49.70	-1.15	3	61	65.1%	0.985	0.0017	-0.187	0.014	0.028
347.50	30.00	42.60	48.10	0.00	3	58	89.1%	0.935	0.0040	-0.709	0.045	0.026
350.00	41.99	38.60	44.60	0.00	2	473	61.9%	0.978	0.0024	-0.231	0.018	0.028
352.50	20.90	35.70	42.70	0.00	3	26	61.2%	0.972	0.0030	-0.272	0.023	0.028
355.00	43.35	33.40	39.60	0.00	1	146	52.5%	0.981	0.0025	-0.187	0.017	0.029
357.50	40.00	31.00	37.40	0.00	4	121	54.4%	0.968	0.0037	-0.270	0.025	0.028
360.00	31.70	29.50	34.60	0.00	7	480	57.6%	0.948	0.0052	-0.403	0.038	0.028
362.50	38.12	26.00	33.10	0.00	2	120	53.9%	0.944	0.0059	-0.399	0.040	0.028
365.00	33.24	24.10	30.90	-2.52	1	260	56.4%	0.917	0.0076	-0.546	0.054	0.027
367.50	33.27	23.20	28.30	0.00	2	15	60.7%	0.879	0.0094	-0.760	0.071	0.026
370.00	26.00	19.20	26.00	4.17	12	432	79.9%	0.791	0.0101	-1.392	0.102	0.023
372.50	26.38	16.80	21.70	0.00	12	51	60.3%	0.824	0.0121	-0.958	0.092	0.025
375.00	23.40	14.60	21.20	5.90	1	234	70.8%	0.757	0.0125	-1.342	0.111	0.023
377.50	20.90	12.10	18.70	7.90	1	1	65.2%	0.738	0.0141	-1.287	0.115	0.022
380.00	14.95	10.60	16.80	2.09	167	634	63.7%	0.704	0.0153	-1.331	0.122	0.021
382.50	16.80	7.80	15.20	0.00	0	8	63.7%	0.664	0.0162	-1.401	0.129	0.020
385.00	10.27	7.10	13.20	1.35	6	181	60.5%	0.627	0.0176	-1.381	0.134	0.019
387.50	12.00	4.20	11.10	0.00	0	3	56.2%	0.586	0.0195	-1.321	0.138	0.018
390.00	8.75	3.50	10.00	2.45	8	306	57.6%	0.536	0.0194	-1.377	0.141	0.017
392.50	8.26	3.20	7.70	2.95	7	17	51.0%	0.483	0.0220	-1.223	0.141	0.015
395.00	4.01	1.20	7.20	0.25	46	246	54.7%	0.435	0.0203	-1.292	0.140	0.013
397.50	3.46	0.30	6.70	0.56	16	148	57.9%	0.393	0.0187	-1.332	0.136	0.012
400.00	3.00	1.10	3.00	0.72	184	620	39.2%	0.274	0.0240	-0.785	0.118	0.009
402.50	3.30	0.80	2.35	1.55	6	24	39.2%	0.219	0.0212	-0.695	0.105	0.007
405.00	2.08	0.00	2.25	0.98	37	383	42.9%	0.194	0.0181	-0.705	0.097	0.006
407.50	1.11	0.00	1.15	0.16	19	40	36.9%	0.116	0.0149	-0.432	0.069	0.004
410.00	0.10	0.25	1.20	-0.56	270	237	41.1%	0.109	0.0128	-0.458	0.066	0.003
412.50	0.52	0.00	1.00	0.42	8	6	42.3%	0.088	0.0106	-0.402	0.056	0.003
415.00	0.31	0.00	0.60	0.01	11	206	39.9%	0.054	0.0078	-0.262	0.039	0.002
417.50	0.44	0.00	0.55	0.07	6	10	42.1%	0.047	0.0065	-0.245	0.035	0.001
420.00	0.20	0.05	0.35	0.06	22	570	40.9%	0.029	0.0046	-0.164	0.024	0.001
422.50	0.15	0.00	1.40	-0.37	1	8	50.6%	0.050	0.0057	-0.309	0.036	0.002
425.00	0.15	0.00	0.15	-0.26	6	216	39.8%	0.012	0.0022	-0.072	0.011	0.000
430.00	0.13	0.00	0.30	-0.02	3	171	50.0%	0.020	0.0027	-0.143	0.017	0.001
435.00	1.45	0.00	1.15	0.00	14	237	62.1%	0.032	0.0033	-0.264	0.025	0.001
440.00	0.05	0.00	1.25	0.00	1	274	68.4%	0.031	0.0029	-0.288	0.025	0.001
445.00	0.10	0.00	1.05	-0.40	1	73	71.1%	0.025	0.0023	-0.246	0.021	0.001
450.00	0.03	0.00	0.05	-0.12	5	1,550	50.0%	0.001	0.0002	-0.011	0.001	0.000
455.00	0.13	0.00	1.20	0.00	6	62	82.8%	0.024	0.0019	-0.280	0.020	0.001
460.00	0.69	0.00	0.40	0.00	3	482	73.1%	0.008	0.0009	-0.096	0.008	0.000
465.00	0.66	0.00	1.20	0.00	2	190	92.2%	0.022	0.0016	-0.282	0.018	0.001
470.00	0.06	0.00	0.35	0.00	3	380	79.7%	0.006	0.0006	-0.083	0.006	0.000
475.00	0.03	0.00	4.30	0.00	4	279	131.9%	0.059	0.0025	-0.923	0.042	0.002
480.00	0.05	0.00	1.65	-0.01	78	64	111.9%	0.025	0.0015	-0.385	0.021	0.001
485.00	0.17	0.00	4.30	-2.66	1	124	142.2%	0.055	0.0022	-0.934	0.039	0.002
490.00	0.10	0.00	4.30	0.00	1	107	147.2%	0.053	0.0021	-0.938	0.038	0.002
495.00	0.10	0.00	0.80	0.00	1	162	110.8%	0.011	0.0007	-0.191	0.010	0.000
500.00	0.05	0.00	0.05	0.00	3	1,217	82.4%	0.001	0.0001	-0.010	0.001	0.000
505.00	0.08	0.00	0.40	0.00	1	629	107.5%	0.005	0.0004	-0.094	0.005	0.000
510.00	0.05	0.00	4.30	-0.15	75	334	166.3%	0.046	0.0016	-0.955	0.034	0.001
515.00	0.15	0.00	4.30	0.00	3	34	170.8%	0.045	0.0016	-0.958	0.034	0.001
520.00	0.40	0.00	0.80	0.00	1	99	129.8%	0.009	0.0005	-0.190	0.009	0.000
525.00	0.15	0.00	4.30	0.00	1	261	179.7%	0.043	0.0014	-0.964	0.032	0.001
530.00	0.46	0.00	1.00	0.00	1	99	141.6%	0.011	0.0006	-0.238	0.010	0.000
535.00	0.19	0.00	4.30	-0.38	4	115	188.4%	0.040	0.0013	-0.969	0.031	0.001
540.00	0.19	0.00	4.30	-0.31	1	42	192.6%	0.039	0.0012	-0.971	0.030	0.001
545.00	0.07	0.00	4.30	0.00	2	40	196.8%	0.039	0.0012	-0.974	0.030	0.001
550.00	0.65	0.00	4.30	0.00	6	107	200.8%	0.038	0.0012	-0.975	0.029	0.001
560.00	0.08	0.00	0.30	0.03	85	108	138.9%	0.003	0.0002	-0.068	0.003	0.000
565.00	0.06	0.00	4.30	-0.24	2	2	212.8%	0.035	0.0010	-0.981	0.028	0.001
570.00	0.03	0.00	0.05	-0.02	2	309	121.1%	0.000	0.0000	-0.010	0.000	0.000
575.00	0.05	0.00	4.30	0.01	82	270	220.5%	0.034	0.0010	-0.985	0.027	0.001
580.00	0.09	0.00	4.30	0.00	1	47	224.3%	0.033	0.0009	-0.987	0.026	0.001
585.00	1.82	0.00	4.30	0.00	1	1	228.0%	0.033	0.0009	-0.988	0.026	0.001
590.00	3.05	0.00	1.75	0.00	1	8	197.8%	0.014	0.0005	-0.415	0.013	0.000
595.00	1.75	0.00	4.30	0.00	1	3	235.4%	0.032	0.0009	-0.990	0.025	0.001
600.00	0.21	0.00	0.80	0.00	1	223	182.3%	0.006	0.0003	-0.188	0.006	0.000
605.00	0.24	0.00	0.80	0.05	1	2	185.3%	0.006	0.0003	-0.187	0.006	0.000
610.00	0.15	0.00	0.20	-0.80	1	11	159.8%	0.001	0.0001	-0.043	0.002	0.000
615.00	0.08	0.00	4.30	0.00	1	7	249.5%	0.030	0.0008	-0.995	0.024	0.001
620.00	3.90	0.00	4.80	0.00	0	1	258.3%	0.032	0.0008	-1.105	0.026	0.001
625.00	1.76	0.00	4.30	0.00	1	1	256.3%	0.029	0.0007	-0.997	0.023	0.001
630.00	0.07	0.00	4.30	0.00	1	25	259.7%	0.028	0.0007	-0.999	0.023	0.001
640.00	0.69	0.00	4.30	0.00	3	17	266.3%	0.028	0.0007	-1.000	0.023	0.001
650.00	0.10	0.00	4.30	0.09	1	38	272.7%	0.027	0.0006	-1.002	0.022	0.001
660.00	0.10	0.00	4.30	-0.72	1	1	279.0%	0.026	0.0006	-1.003	0.022	0.001
670.00	0.10	0.00	4.30	0.09	1	27	285.2%	0.026	0.0006	-1.004	0.021	0.001
680.00	0.09	0.00	4.30	0.00	2	19	291.3%	0.025	0.0006	-1.006	0.021	0.001

Puts

Strike	Last	Bid	Ask	Chg	Vol	OI	IV	Delta	Gamma	Theta	Vega	Rho
180.00	1.88	0.00	0.25	0.00	2	5	287.9%	-0.001	0.0000	-0.055	0.001	-0.000
190.00	0.14	0.00	0.15	-2.24	1	2	254.7%	-0.001	0.0000	-0.031	0.001	-0.000
200.00	0.20	0.00	4.30	-1.78	1	4	382.8%	-0.018	0.0003	-0.979	0.015	-0.001
210.00	0.53	0.00	4.30	0.00	0	1	358.4%	-0.019	0.0004	-0.975	0.016	-0.001
250.00	0.05	0.00	0.05	-0.20	1	17	146.9%	-0.000	0.0000	-0.010	0.000	-0.000
260.00	0.06	0.00	0.15	0.00	85	117	150.4%	-0.001	0.0001	-0.032	0.001	-0.000
270.00	0.13	0.00	1.25	0.04	1	10	183.0%	-0.010	0.0004	-0.292	0.010	-0.000
275.00	0.40	0.00	4.30	0.00	12	19	222.2%	-0.032	0.0009	-0.942	0.025	-0.001
280.00	0.44	0.00	2.00	0.00	11	106	181.9%	-0.017	0.0007	-0.460	0.015	-0.001
285.00	0.27	0.00	4.30	0.00	8	134	203.7%	-0.035	0.0011	-0.934	0.028	-0.001
290.00	0.01	0.00	2.75	0.00	2	117	176.5%	-0.025	0.0009	-0.617	0.021	-0.001
295.00	0.03	0.00	1.65	0.00	5	32	152.1%	-0.017	0.0008	-0.379	0.015	-0.001
300.00	0.01	0.00	0.60	0.00	6	236	122.0%	-0.007	0.0004	-0.140	0.007	-0.000
305.00	0.05	0.00	0.50	0.00	6	57	112.3%	-0.006	0.0004	-0.116	0.006	-0.000
310.00	0.05	0.00	0.05	0.03	1	125	80.5%	-0.001	0.0001	-0.010	0.001	-0.000
315.00	0.10	0.00	0.80	0.00	2	224	107.1%	-0.011	0.0008	-0.186	0.010	-0.000
317.50	1.42	0.00	0.85	0.00	2	4	104.8%	-0.012	0.0009	-0.197	0.011	-0.000
320.00	0.80	0.00	0.70	0.00	1	587	98.2%	-0.011	0.0008	-0.163	0.010	-0.000
322.50	0.30	0.00	1.15	0.00	1	2	103.5%	-0.018	0.0012	-0.264	0.015	-0.001
325.00	0.44	0.00	1.00	0.00	1	279	97.6%	-0.016	0.0012	-0.230	0.014	-0.001
327.50	0.51	0.00	1.40	0.00	3	24	100.3%	-0.023	0.0015	-0.317	0.019	-0.001
330.00	0.09	0.00	1.20	0.00	1	288	93.9%	-0.020	0.0015	-0.274	0.018	-0.001
332.50	0.58	0.00	1.20	0.00	1	72	90.5%	-0.021	0.0016	-0.273	0.018	-0.001
335.00	0.10	0.00	1.40	0.00	7	333	89.7%	-0.026	0.0019	-0.315	0.021	-0.001
337.50	0.44	0.00	1.40	0.00	8	78	86.2%	-0.027	0.0020	-0.313	0.022	-0.001
340.00	0.15	0.00	0.35	0.03	11	732	64.8%	-0.008	0.0009	-0.081	0.008	-0.000
342.50	0.28	0.00	0.55	-0.54	1	51	66.5%	-0.013	0.0014	-0.127	0.012	-0.000
345.00	0.33	0.00	1.90	0.22	1	170	81.0%	-0.040	0.0030	-0.409	0.030	-0.001
347.50	0.43	0.00	1.25	0.23	2	27	70.5%	-0.029	0.0027	-0.277	0.024	-0.001
350.00	0.15	0.00	0.45	-0.06	11	508	55.4%	-0.012	0.0016	-0.104	0.011	-0.000
352.50	1.00	0.00	4.30	0.00	15	133	87.3%	-0.087	0.0051	-0.812	0.056	-0.003
355.00	0.10	0.00	4.30	0.00	1	161	83.0%	-0.091	0.0056	-0.802	0.058	-0.003
357.50	0.05	0.00	1.40	0.00	1	33	58.2%	-0.041	0.0043	-0.299	0.031	-0.001
360.00	0.44	0.00	1.05	0.25	2	554	51.2%	-0.034	0.0042	-0.228	0.027	-0.001
362.50	0.14	0.00	4.30	0.00	1	22	70.2%	-0.109	0.0075	-0.768	0.066	-0.004
365.00	0.10	0.00	0.55	-0.12	6	93	44.9%	-0.042	0.0056	-0.234	0.032	-0.001
367.50	0.25	0.00	0.55	0.00	1	137	41.4%	-0.045	0.0065	-0.231	0.034	-0.001
370.00	0.15	0.00	0.55	-0.31	17	550	37.9%	-0.050	0.0076	-0.228	0.036	-0.002
372.50	0.57	0.00	0.90	0.00	2	24	39.3%	-0.081	0.0107	-0.344	0.053	-0.003
375.00	0.20	0.10	1.60	-0.50	3	198	42.9%	-0.132	0.0141	-0.537	0.076	-0.004
377.50	0.80	0.00	2.10	-0.44	4	84	42.9%	-0.173	0.0168	-0.640	0.091	-0.006
380.00	1.96	0.45	3.20	0.34	33	326	46.6%	-0.237	0.0187	-0.839	0.109	-0.008
382.50	2.32	0.40	4.30	0.04	30	136	48.9%	-0.296	0.0199	-0.983	0.122	-0.010
385.00	1.35	0.15	5.50	-1.55	2	129	50.7%	-0.353	0.0206	-1.098	0.132	-0.012
387.50	2.20	0.05	5.30	-1.82	13	48	43.0%	-0.393	0.0252	-0.958	0.136	-0.013
390.00	4.00	1.85	7.10	-1.00	22	340	47.1%	-0.460	0.0238	-1.082	0.141	-0.015
392.50	2.84	3.20	8.20	-0.87	2	26	46.0%	-0.521	0.0244	-1.058	0.141	-0.017
395.00	4.00	3.50	9.70	-4.30	3	226	46.5%	-0.580	0.0237	-1.048	0.139	-0.019
397.50	4.50	6.40	11.30	-4.95	100	30	47.0%	-0.636	0.0226	-1.012	0.133	-0.021
400.00	6.00	8.20	11.40	-5.67	2	614	36.2%	-0.743	0.0251	-0.655	0.114	-0.025
402.50	7.30	9.40	15.10	-1.63	2	5	49.7%	-0.727	0.0189	-0.942	0.118	-0.025
405.00	8.48	11.40	16.10	-6.82	4	316	43.1%	-0.805	0.0180	-0.664	0.098	-0.027
410.00	12.84	15.40	20.50	-6.55	2	108	46.0%	-0.864	0.0134	-0.551	0.077	-0.029
415.00	21.00	19.50	25.40	0.00	7	50	52.3%	-0.888	0.0103	-0.547	0.068	-0.031
420.00	48.00	25.10	31.10	0.00	1	15	66.7%	-0.873	0.0088	-0.779	0.074	-0.031
425.00	33.04	31.40	36.70	0.00	1	2	79.8%	-0.865	0.0077	-0.979	0.077	-0.031
430.00	86.00	34.00	40.80	0.00	1	1	77.3%	-0.905	0.0062	-0.726	0.060	-0.032
435.00	80.90	39.00	45.20	0.00	20	14	75.9%	-0.934	0.0048	-0.530	0.046	-0.034
440.00	41.90	46.40	50.20	0.00	4	0	81.8%	-0.939	0.0042	-0.537	0.043	-0.034
445.00	94.08	49.40	56.40	0.00	25	2	103.4%	-0.907	0.0045	-0.966	0.059	-0.034
450.00	97.72	54.00	61.20	0.00	2	0	107.1%	-0.918	0.0040	-0.911	0.054	-0.034
455.00	105.25	59.40	66.50	0.00	8	1	116.8%	-0.915	0.0038	-1.026	0.055	-0.035
460.00	63.28	64.00	71.80	0.00	3	1	126.3%	-0.912	0.0036	-1.139	0.057	-0.035
465.00	68.25	69.40	76.70	0.00	1	1	130.9%	-0.918	0.0032	-1.116	0.054	-0.036
470.00	72.69	75.30	81.40	0.00	1	5	132.6%	-0.928	0.0029	-1.019	0.048	-0.036
475.00	102.40	79.40	85.80	0.00	11	4	129.3%	-0.945	0.0024	-0.802	0.040	-0.037
480.00	82.58	86.40	90.20	0.00	1	4	124.0%	-0.961	0.0019	-0.566	0.030	-0.038
485.00	111.31	89.40	96.00	0.00	1	0	142.7%	-0.945	0.0022	-0.888	0.040	-0.038
490.00	116.35	94.00	101.60	0.00	2	3	156.6%	-0.935	0.0023	-1.121	0.045	-0.038
495.00	121.38	99.40	106.70	0.00	1	0	163.1%	-0.935	0.0022	-1.164	0.045	-0.039
500.00	161.80	104.00	111.20	0.00	1	0	160.6%	-0.946	0.0019	-0.979	0.039	-0.039
505.00	166.77	109.40	116.50	0.00	1	0	170.1%	-0.943	0.0019	-1.099	0.041	-0.040
510.00	90.65	91.30	96.10	0.00	2	2	0.0%	-1.000	0.0000	0.060	0.000	-0.042
515.00	96.51	96.00	100.60	0.00	1	1	0.0%	-1.000	0.0000	0.061	0.000	-0.042
525.00	93.30	129.00	136.50	0.00	1	0	188.7%	-0.949	0.0016	-1.116	0.037	-0.042
545.00	202.00	149.40	156.50	0.00	2	0	206.3%	-0.953	0.0013	-1.128	0.035	-0.043
550.00	206.97	154.40	161.70	0.00	2	0	213.9%	-0.951	0.0013	-1.212	0.036	-0.044
580.00	105.00	157.20	165.30	0.00	2	0	0.0%	-1.000	0.0000	0.068	0.000	-0.048
600.00	149.75	177.20	183.60	0.00	0	0	0.0%	-1.000	0.0000	0.071	0.000	-0.049

How to Read the Chain

Use this market-close chain snapshot to compare liquidity, pricing, IV, and per-contract greeks across the active expiration.

How to scan it

Start with strike, bid/ask spread, open interest, and volume. Then use IV and greeks to decide whether a contract fits your directional, income, or volatility idea.

What matters first

Clean fills matter before a contract looks mathematically attractive. A thin market can erase the edge you think you found.

What can mislead you

Low premium, high IV, or one convenient delta do not make a trade by themselves. Check how far the strike sits from spot, expected move, and the event calendar.

Greeks are close-of-day estimates, and blank greek cells usually mean usable implied volatility was unavailable for that contract.