ISRG Options Open Interest by Strike, Oct 21 Settlement

ISRG open interest settled 2026-10-21 vs 2026-10-20.

Source: SquawkFlow's archive of settled open interest. Counts are contracts, not trades; they do not identify which side opened or closed a position.

Computed from the Oct 21 settlement. Next update after the Oct 22 settlement, after 5:30 a.m. PT (8:30 a.m. ET) on Friday, Oct 23, 2026.

All archived unexpired expiration/strike/type keys, including unchanged counts. Series sharing that key are combined; roots and deliverables are not retained. Zero-OI keys omitted by the archive are not reconstructed.

This page shows the 6 nearest of 16 expirations, with the 40 strikes nearest the archived reference price (2026-10-21) for each, plus the largest changes across the whole book. The complete book, 1,502 expiration/strike/type keys, is in the Markdown table.

Strike bucket on the horizontal axis, settled open contracts per bucket on the vertical axis. Calls in the accent color; puts in orange. Totals across the 6 nearest expirations, strikes from 342 to 513. Source: SquawkFlow's archive of settled open interest. Counts are contracts, not trades; they do not identify which side opened or closed a position.

ISRG: largest changes in the full book, settled 2026-10-21 vs 2026-10-20

Strike	Expiry	Type	Prior OI	Settled OI	Change
440	10/23	call	233	433	+200
460	10/23	call	535	677	+142
270	01/19	put	5	135	+130
455	10/23	call	155	281	+126
430	11/06	call	16	137	+121
470	10/23	call	356	238	-118
440	11/06	call	11	119	+108
395	10/23	put	280	385	+105
430	03/19	put	38	139	+101
435	10/23	call	615	517	-98
470	10/30	call	129	43	-86
435	11/13	call	16	102	+86
415	10/23	put	581	502	-79
425	10/23	put	222	299	+77
440	09/17	put	32	101	+69

Expiration 2026-10-23

ISRG open interest, settled 2026-10-21, expiration 2026-10-23, strikes 377.5 to 475

Strike	Expiry	Type	Prior OI	Settled OI	Change
377.5	10/23	call	1	1	0
377.5	10/23	put	113	78	-35
380	10/23	call	12	9	-3
380	10/23	put	235	187	-48
382.5	10/23	put	54	53	-1
385	10/23	call	19	18	-1
385	10/23	put	213	238	+25
387.5	10/23	call	19	19	0
387.5	10/23	put	69	59	-10
390	10/23	call	48	48	0
390	10/23	put	671	735	+64
392.5	10/23	call	1	1	0
392.5	10/23	put	92	83	-9
395	10/23	call	28	28	0
395	10/23	put	280	385	+105
397.5	10/23	put	40	45	+5
400	10/23	call	88	89	+1
400	10/23	put	816	801	-15
402.5	10/23	call	7	7	0
402.5	10/23	put	203	212	+9
405	10/23	call	12	33	+21
405	10/23	put	497	462	-35
407.5	10/23	call	5	5	0
407.5	10/23	put	22	40	+18
410	10/23	call	52	51	-1
410	10/23	put	240	221	-19
412.5	10/23	call	11	10	-1
412.5	10/23	put	132	80	-52
415	10/23	call	117	117	0
415	10/23	put	581	502	-79
417.5	10/23	call	25	24	-1
417.5	10/23	put	53	46	-7
420	10/23	call	96	95	-1
420	10/23	put	258	222	-36
422.5	10/23	call	35	62	+27
422.5	10/23	put	137	160	+23
425	10/23	call	513	516	+3
425	10/23	put	222	299	+77
427.5	10/23	call	35	41	+6
427.5	10/23	put	85	97	+12
430	10/23	call	128	184	+56
430	10/23	put	305	325	+20
432.5	10/23	call	93	133	+40
432.5	10/23	put	87	82	-5
435	10/23	call	615	517	-98
435	10/23	put	305	285	-20
437.5	10/23	call	174	163	-11
437.5	10/23	put	157	152	-5
440	10/23	call	233	433	+200
440	10/23	put	78	84	+6
442.5	10/23	call	33	58	+25
445	10/23	call	111	114	+3
445	10/23	put	2	6	+4
447.5	10/23	call	36	49	+13
447.5	10/23	put	1	1	0
450	10/23	call	679	708	+29
450	10/23	put	4	6	+2
452.5	10/23	call	16	22	+6
455	10/23	call	155	281	+126
457.5	10/23	call	37	37	0
457.5	10/23	put	2	2	0
460	10/23	call	535	677	+142
462.5	10/23	call	37	36	-1
465	10/23	call	218	200	-18
465	10/23	put	1	0	-1
467.5	10/23	call	18	14	-4
470	10/23	call	356	238	-118
472.5	10/23	call	28	21	-7
475	10/23	call	1,219	1,164	-55

Expiration 2026-10-30

ISRG open interest, settled 2026-10-21, expiration 2026-10-30, strikes 370 to 480

Strike	Expiry	Type	Prior OI	Settled OI	Change
370	10/30	call	51	51	0
370	10/30	put	53	52	-1
375	10/30	call	59	59	0
375	10/30	put	67	67	0
380	10/30	call	13	13	0
380	10/30	put	60	78	+18
382.5	10/30	put	0	6	+6
385	10/30	call	19	19	0
385	10/30	put	40	41	+1
390	10/30	call	12	16	+4
390	10/30	put	53	75	+22
392.5	10/30	call	1	3	+2
392.5	10/30	put	8	8	0
395	10/30	call	39	38	-1
395	10/30	put	40	42	+2
397.5	10/30	call	1	2	+1
397.5	10/30	put	101	111	+10
400	10/30	call	30	30	0
400	10/30	put	58	81	+23
402.5	10/30	call	6	6	0
402.5	10/30	put	0	1	+1
405	10/30	call	31	32	+1
405	10/30	put	50	51	+1
407.5	10/30	call	0	1	+1
407.5	10/30	put	29	30	+1
410	10/30	call	43	38	-5
410	10/30	put	74	93	+19
412.5	10/30	call	1	2	+1
412.5	10/30	put	0	20	+20
415	10/30	call	29	27	-2
415	10/30	put	16	14	-2
417.5	10/30	call	2	3	+1
417.5	10/30	put	51	51	0
420	10/30	call	67	68	+1
420	10/30	put	12	15	+3
422.5	10/30	call	10	11	+1
422.5	10/30	put	0	6	+6
425	10/30	call	32	43	+11
425	10/30	put	31	35	+4
427.5	10/30	call	7	11	+4
427.5	10/30	put	0	4	+4
430	10/30	call	53	64	+11
430	10/30	put	24	32	+8
432.5	10/30	call	8	32	+24
432.5	10/30	put	10	11	+1
435	10/30	call	34	38	+4
435	10/30	put	32	30	-2
437.5	10/30	call	25	23	-2
437.5	10/30	put	10	11	+1
440	10/30	call	73	127	+54
440	10/30	put	5	5	0
442.5	10/30	call	3	3	0
442.5	10/30	put	5	5	0
445	10/30	call	48	50	+2
447.5	10/30	call	14	12	-2
450	10/30	call	132	180	+48
450	10/30	put	7	6	-1
452.5	10/30	call	1	1	0
452.5	10/30	put	0	3	+3
455	10/30	call	98	101	+3
457.5	10/30	call	1	1	0
460	10/30	call	122	121	-1
465	10/30	call	24	25	+1
467.5	10/30	call	0	1	+1
470	10/30	call	129	43	-86
472.5	10/30	call	2	4	+2
475	10/30	call	17	20	+3
480	10/30	call	86	82	-4

Expiration 2026-11-06

ISRG open interest, settled 2026-10-21, expiration 2026-11-06, strikes 345 to 505

Strike	Expiry	Type	Prior OI	Settled OI	Change
345	11/06	put	2	2	0
350	11/06	put	19	18	-1
355	11/06	put	15	15	0
360	11/06	put	14	14	0
365	11/06	call	1	1	0
365	11/06	put	13	16	+3
370	11/06	put	24	27	+3
375	11/06	put	10	11	+1
380	11/06	call	1	1	0
380	11/06	put	10	12	+2
385	11/06	put	8	10	+2
390	11/06	call	5	5	0
390	11/06	put	56	58	+2
395	11/06	call	8	8	0
395	11/06	put	9	10	+1
400	11/06	call	25	22	-3
400	11/06	put	65	77	+12
405	11/06	call	4	4	0
405	11/06	put	43	43	0
407.5	11/06	put	20	20	0
410	11/06	call	40	30	-10
410	11/06	put	4	7	+3
415	11/06	call	7	7	0
415	11/06	put	6	8	+2
420	11/06	call	35	35	0
420	11/06	put	9	11	+2
422.5	11/06	call	8	9	+1
425	11/06	call	5	10	+5
425	11/06	put	15	14	-1
427.5	11/06	call	0	23	+23
427.5	11/06	put	0	21	+21
430	11/06	call	16	137	+121
430	11/06	put	6	8	+2
432.5	11/06	call	0	10	+10
432.5	11/06	put	1	1	0
435	11/06	call	15	26	+11
435	11/06	put	2	2	0
437.5	11/06	call	1	30	+29
437.5	11/06	put	21	11	-10
440	11/06	call	11	119	+108
440	11/06	put	4	7	+3
442.5	11/06	call	5	4	-1
445	11/06	call	29	27	-2
447.5	11/06	call	0	1	+1
450	11/06	call	48	48	0
450	11/06	put	64	64	0
452.5	11/06	call	1	1	0
455	11/06	call	54	56	+2
460	11/06	call	16	25	+9
465	11/06	call	5	5	0
470	11/06	call	7	6	-1
475	11/06	call	4	4	0
475	11/06	put	1	0	-1
480	11/06	call	7	8	+1
485	11/06	call	4	4	0
490	11/06	call	16	16	0
500	11/06	call	2	4	+2
505	11/06	call	27	27	0

Expiration 2026-11-13

ISRG open interest, settled 2026-10-21, expiration 2026-11-13, strikes 320 to 530

Strike	Expiry	Type	Prior OI	Settled OI	Change
320	11/13	put	3	3	0
325	11/13	put	14	14	0
330	11/13	put	8	8	0
335	11/13	put	58	58	0
340	11/13	put	25	25	0
345	11/13	put	4	4	0
350	11/13	put	2	2	0
355	11/13	put	4	4	0
360	11/13	put	1	1	0
365	11/13	put	6	6	0
370	11/13	call	1	1	0
370	11/13	put	22	22	0
375	11/13	put	16	16	0
380	11/13	put	10	11	+1
385	11/13	put	15	40	+25
390	11/13	put	17	19	+2
395	11/13	call	2	2	0
395	11/13	put	12	10	-2
400	11/13	call	16	17	+1
400	11/13	put	34	26	-8
405	11/13	put	4	12	+8
410	11/13	call	26	26	0
410	11/13	put	16	17	+1
415	11/13	call	2	2	0
415	11/13	put	4	4	0
420	11/13	call	11	11	0
420	11/13	put	68	76	+8
425	11/13	call	9	25	+16
425	11/13	put	10	20	+10
430	11/13	call	10	62	+52
430	11/13	put	12	25	+13
435	11/13	call	16	102	+86
435	11/13	put	5	54	+49
440	11/13	call	9	62	+53
440	11/13	put	2	2	0
445	11/13	call	6	5	-1
450	11/13	call	8	8	0
450	11/13	put	1	0	-1
455	11/13	call	6	6	0
460	11/13	call	6	8	+2
465	11/13	call	7	9	+2
470	11/13	call	4	4	0
475	11/13	call	47	47	0
480	11/13	call	22	18	-4
485	11/13	call	43	44	+1
490	11/13	call	8	8	0
495	11/13	call	2	2	0
500	11/13	call	1	10	+9
505	11/13	call	1	1	0
520	11/13	call	5	5	0
530	11/13	call	5	5	0

Expiration 2026-11-20

ISRG open interest, settled 2026-10-21, expiration 2026-11-20, strikes 355 to 500

Strike	Expiry	Type	Prior OI	Settled OI	Change
355	11/20	call	32	32	0
355	11/20	put	170	165	-5
360	11/20	call	532	532	0
360	11/20	put	248	232	-16
365	11/20	call	32	31	-1
365	11/20	put	429	426	-3
370	11/20	call	260	260	0
370	11/20	put	191	193	+2
375	11/20	call	76	76	0
375	11/20	put	214	234	+20
380	11/20	call	115	115	0
380	11/20	put	555	563	+8
385	11/20	call	51	51	0
385	11/20	put	116	116	0
390	11/20	call	227	227	0
390	11/20	put	533	569	+36
395	11/20	call	74	73	-1
395	11/20	put	258	263	+5
400	11/20	call	293	279	-14
400	11/20	put	315	331	+16
405	11/20	call	48	48	0
405	11/20	put	422	446	+24
407.5	11/20	put	3	32	+29
410	11/20	call	157	154	-3
410	11/20	put	450	464	+14
412.5	11/20	put	7	10	+3
415	11/20	call	139	139	0
415	11/20	put	81	87	+6
417.5	11/20	put	11	38	+27
420	11/20	call	819	817	-2
420	11/20	put	310	328	+18
422.5	11/20	call	0	4	+4
422.5	11/20	put	0	20	+20
425	11/20	call	311	310	-1
425	11/20	put	53	72	+19
427.5	11/20	call	1	1	0
427.5	11/20	put	1	17	+16
430	11/20	call	219	222	+3
430	11/20	put	55	87	+32
432.5	11/20	call	21	29	+8
432.5	11/20	put	4	3	-1
435	11/20	call	578	577	-1
435	11/20	put	65	122	+57
437.5	11/20	call	138	100	-38
437.5	11/20	put	10	9	-1
440	11/20	call	375	391	+16
440	11/20	put	26	26	0
442.5	11/20	call	2	2	0
442.5	11/20	put	2	2	0
445	11/20	call	173	182	+9
445	11/20	put	14	14	0
447.5	11/20	call	1	1	0
450	11/20	call	509	507	-2
450	11/20	put	31	34	+3
452.5	11/20	call	14	16	+2
455	11/20	call	300	298	-2
455	11/20	put	1	1	0
460	11/20	call	253	236	-17
460	11/20	put	48	48	0
465	11/20	call	183	183	0
465	11/20	put	11	11	0
470	11/20	call	385	382	-3
470	11/20	put	42	42	0
475	11/20	call	391	389	-2
480	11/20	call	340	325	-15
480	11/20	put	1	1	0
485	11/20	call	108	108	0
485	11/20	put	1	1	0
490	11/20	call	85	80	-5
495	11/20	call	15	15	0
500	11/20	call	333	331	-2

Expiration 2026-11-27

ISRG open interest, settled 2026-10-21, expiration 2026-11-27, strikes 330 to 520

Strike	Expiry	Type	Prior OI	Settled OI	Change
330	11/27	put	209	209	0
355	11/27	put	5	5	0
365	11/27	put	11	11	0
370	11/27	put	1	3	+2
375	11/27	put	5	7	+2
380	11/27	put	7	9	+2
385	11/27	put	2	12	+10
390	11/27	put	3	6	+3
395	11/27	call	5	5	0
395	11/27	put	143	146	+3
400	11/27	call	1	1	0
400	11/27	put	9	12	+3
405	11/27	call	16	16	0
405	11/27	put	5	7	+2
410	11/27	call	0	1	+1
410	11/27	put	32	32	0
415	11/27	call	13	23	+10
415	11/27	put	5	8	+3
420	11/27	call	5	7	+2
420	11/27	put	6	6	0
425	11/27	call	0	1	+1
425	11/27	put	3	3	0
430	11/27	call	1	12	+11
430	11/27	put	6	6	0
435	11/27	call	3	3	0
435	11/27	put	5	5	0
440	11/27	call	5	10	+5
440	11/27	put	1	1	0
445	11/27	call	3	3	0
445	11/27	put	1	1	0
450	11/27	call	8	11	+3
450	11/27	put	2	2	0
455	11/27	call	3	4	+1
460	11/27	call	37	39	+2
465	11/27	call	3	3	0
470	11/27	call	1	1	0
475	11/27	call	9	8	-1
480	11/27	call	7	6	-1
485	11/27	call	1	1	0
490	11/27	call	7	7	0
505	11/27	call	5	5	0
510	11/27	call	1	1	0
520	11/27	call	1	1	0

Later expirations (2026-12-18, 2027-01-15, 2027-02-19, 2027-03-19, 2027-04-16, 2027-06-17, 2027-09-17, 2028-01-21, 2028-12-15, 2029-01-19) and all other strikes are in the Markdown table.

Markdown table | Open interest changes across symbols

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