ZS Options Open Interest by Strike, Oct 21 Settlement

ZS 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, 1,296 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 185 to 277. Source: SquawkFlow's archive of settled open interest. Counts are contracts, not trades; they do not identify which side opened or closed a position.

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

Strike	Expiry	Type	Prior OI	Settled OI	Change
235	10/23	call	225	1,032	+807
237.5	10/23	call	136	599	+463
250	10/30	call	151	565	+414
232.5	10/23	call	595	895	+300
217.5	10/30	put	173	467	+294
180	10/30	put	133	398	+265
195	10/30	put	64	323	+259
217.5	10/23	put	891	653	-238
190	11/20	put	1,648	1,428	-220
252.5	10/30	call	0	209	+209
230	10/23	call	519	683	+164
225	11/27	put	15	168	+153
255	11/20	call	11	158	+147
185	11/20	put	688	811	+123
250	11/20	call	1,579	1,699	+120

Expiration 2026-10-23

ZS open interest, settled 2026-10-21, expiration 2026-10-23, strikes 180 to 280

Strike	Expiry	Type	Prior OI	Settled OI	Change
180	10/23	call	21	21	0
180	10/23	put	232	232	0
182.5	10/23	call	2	2	0
182.5	10/23	put	98	98	0
185	10/23	call	21	19	-2
185	10/23	put	42	42	0
187.5	10/23	call	22	22	0
187.5	10/23	put	66	66	0
190	10/23	call	75	74	-1
190	10/23	put	353	363	+10
192.5	10/23	call	24	24	0
192.5	10/23	put	70	84	+14
195	10/23	call	94	94	0
195	10/23	put	200	196	-4
197.5	10/23	call	13	13	0
197.5	10/23	put	293	296	+3
200	10/23	call	126	125	-1
200	10/23	put	391	381	-10
202.5	10/23	call	21	16	-5
202.5	10/23	put	324	283	-41
205	10/23	call	328	300	-28
205	10/23	put	398	423	+25
207.5	10/23	call	25	23	-2
207.5	10/23	put	553	553	0
210	10/23	call	166	161	-5
210	10/23	put	294	277	-17
212.5	10/23	call	457	450	-7
212.5	10/23	put	259	236	-23
215	10/23	call	261	241	-20
215	10/23	put	903	917	+14
217.5	10/23	call	470	470	0
217.5	10/23	put	891	653	-238
220	10/23	call	757	697	-60
220	10/23	put	281	308	+27
222.5	10/23	call	204	182	-22
222.5	10/23	put	281	323	+42
225	10/23	call	306	264	-42
225	10/23	put	507	526	+19
227.5	10/23	call	203	250	+47
227.5	10/23	put	13	37	+24
230	10/23	call	519	683	+164
230	10/23	put	107	118	+11
232.5	10/23	call	595	895	+300
232.5	10/23	put	105	105	0
235	10/23	call	225	1,032	+807
235	10/23	put	19	20	+1
237.5	10/23	call	136	599	+463
237.5	10/23	put	8	9	+1
240	10/23	call	417	459	+42
240	10/23	put	97	97	0
242.5	10/23	call	245	335	+90
242.5	10/23	put	39	39	0
245	10/23	call	268	296	+28
245	10/23	put	1	1	0
247.5	10/23	call	19	111	+92
250	10/23	call	308	333	+25
252.5	10/23	call	3	9	+6
255	10/23	call	529	529	0
257.5	10/23	call	0	10	+10
260	10/23	call	758	838	+80
265	10/23	call	84	84	0
267.5	10/23	call	5	5	0
270	10/23	call	138	140	+2
272.5	10/23	call	16	16	0
275	10/23	call	58	62	+4
277.5	10/23	call	4	4	0
280	10/23	call	122	124	+2

Expiration 2026-10-30

ZS open interest, settled 2026-10-21, expiration 2026-10-30, strikes 175 to 285

Strike	Expiry	Type	Prior OI	Settled OI	Change
175	10/30	call	5	5	0
175	10/30	put	33	33	0
177.5	10/30	call	6	6	0
177.5	10/30	put	6	43	+37
180	10/30	call	13	13	0
180	10/30	put	133	398	+265
182.5	10/30	call	2	2	0
182.5	10/30	put	21	51	+30
185	10/30	call	12	12	0
185	10/30	put	59	102	+43
187.5	10/30	call	6	6	0
187.5	10/30	put	47	62	+15
190	10/30	call	68	73	+5
190	10/30	put	614	621	+7
192.5	10/30	call	38	29	-9
192.5	10/30	put	21	21	0
195	10/30	call	70	70	0
195	10/30	put	64	323	+259
197.5	10/30	call	18	18	0
197.5	10/30	put	49	46	-3
200	10/30	call	209	201	-8
200	10/30	put	106	110	+4
202.5	10/30	call	509	509	0
202.5	10/30	put	235	235	0
205	10/30	call	321	322	+1
205	10/30	put	135	148	+13
207.5	10/30	call	262	272	+10
207.5	10/30	put	241	241	0
210	10/30	call	237	237	0
210	10/30	put	1,053	1,063	+10
212.5	10/30	call	210	209	-1
212.5	10/30	put	302	293	-9
215	10/30	call	484	489	+5
215	10/30	put	236	240	+4
217.5	10/30	call	42	42	0
217.5	10/30	put	173	467	+294
220	10/30	call	1,061	987	-74
220	10/30	put	63	146	+83
222.5	10/30	call	362	354	-8
222.5	10/30	put	55	89	+34
225	10/30	call	324	394	+70
225	10/30	put	87	88	+1
227.5	10/30	call	119	121	+2
227.5	10/30	put	15	21	+6
230	10/30	call	345	371	+26
230	10/30	put	26	28	+2
232.5	10/30	call	95	117	+22
232.5	10/30	put	208	210	+2
235	10/30	call	167	274	+107
235	10/30	put	7	8	+1
237.5	10/30	call	81	106	+25
237.5	10/30	put	7	7	0
240	10/30	call	204	259	+55
240	10/30	put	13	14	+1
242.5	10/30	call	67	69	+2
242.5	10/30	put	1	1	0
245	10/30	call	485	507	+22
245	10/30	put	6	8	+2
247.5	10/30	call	33	134	+101
250	10/30	call	151	565	+414
250	10/30	put	5	5	0
252.5	10/30	call	0	209	+209
255	10/30	call	70	87	+17
257.5	10/30	call	0	10	+10
260	10/30	call	69	85	+16
260	10/30	put	4	4	0
265	10/30	call	44	49	+5
265	10/30	put	2	2	0
270	10/30	call	26	28	+2
270	10/30	put	0	2	+2
275	10/30	call	52	52	0
280	10/30	call	43	43	0
285	10/30	call	69	69	0

Expiration 2026-11-06

ZS open interest, settled 2026-10-21, expiration 2026-11-06, strikes 160 to 295

Strike	Expiry	Type	Prior OI	Settled OI	Change
160	11/06	call	1	1	0
160	11/06	put	56	56	0
165	11/06	call	1	1	0
165	11/06	put	25	27	+2
170	11/06	call	1	3	+2
170	11/06	put	54	54	0
175	11/06	call	12	12	0
175	11/06	put	71	65	-6
177.5	11/06	call	1	1	0
180	11/06	call	1	1	0
180	11/06	put	42	42	0
182.5	11/06	call	1	1	0
182.5	11/06	put	5	5	0
185	11/06	call	10	10	0
185	11/06	put	27	27	0
187.5	11/06	call	1	1	0
187.5	11/06	put	20	20	0
190	11/06	call	7	7	0
190	11/06	put	29	30	+1
192.5	11/06	call	6	6	0
192.5	11/06	put	22	24	+2
195	11/06	call	8	8	0
195	11/06	put	159	160	+1
197.5	11/06	call	8	8	0
197.5	11/06	put	14	14	0
200	11/06	call	34	33	-1
200	11/06	put	67	72	+5
202.5	11/06	call	7	7	0
202.5	11/06	put	16	16	0
205	11/06	call	39	39	0
205	11/06	put	43	44	+1
207.5	11/06	call	21	21	0
207.5	11/06	put	48	48	0
210	11/06	call	46	46	0
210	11/06	put	135	133	-2
212.5	11/06	call	30	30	0
212.5	11/06	put	49	48	-1
215	11/06	call	38	38	0
215	11/06	put	204	206	+2
217.5	11/06	call	80	79	-1
217.5	11/06	put	42	134	+92
220	11/06	call	31	32	+1
220	11/06	put	17	19	+2
222.5	11/06	call	16	16	0
222.5	11/06	put	77	77	0
225	11/06	call	63	73	+10
225	11/06	put	134	247	+113
227.5	11/06	call	75	79	+4
227.5	11/06	put	59	59	0
230	11/06	call	109	111	+2
230	11/06	put	19	19	0
232.5	11/06	call	88	90	+2
232.5	11/06	put	7	7	0
235	11/06	call	96	97	+1
235	11/06	put	2	2	0
240	11/06	call	46	53	+7
245	11/06	call	69	71	+2
250	11/06	call	55	73	+18
255	11/06	call	177	183	+6
260	11/06	call	25	32	+7
265	11/06	call	5	5	0
270	11/06	call	6	7	+1
270	11/06	put	1	1	0
275	11/06	call	1	1	0
280	11/06	call	8	9	+1
285	11/06	call	12	12	0
285	11/06	put	0	1	+1
290	11/06	call	0	46	+46
295	11/06	call	4	4	0

Expiration 2026-11-13

ZS open interest, settled 2026-10-21, expiration 2026-11-13, strikes 145 to 300

Strike	Expiry	Type	Prior OI	Settled OI	Change
145	11/13	call	1	1	0
150	11/13	call	1	1	0
160	11/13	call	1	1	0
160	11/13	put	17	17	0
165	11/13	call	2	2	0
170	11/13	call	2	2	0
170	11/13	put	2	2	0
175	11/13	put	13	13	0
177.5	11/13	put	7	7	0
180	11/13	call	3	3	0
180	11/13	put	33	34	+1
182.5	11/13	put	5	5	0
185	11/13	call	3	3	0
185	11/13	put	6	5	-1
187.5	11/13	call	1	1	0
187.5	11/13	put	12	12	0
190	11/13	call	2	2	0
190	11/13	put	22	22	0
192.5	11/13	call	3	3	0
192.5	11/13	put	9	9	0
195	11/13	call	4	4	0
195	11/13	put	6	7	+1
197.5	11/13	put	3	5	+2
200	11/13	call	7	7	0
200	11/13	put	32	39	+7
202.5	11/13	call	5	5	0
202.5	11/13	put	38	38	0
205	11/13	call	54	54	0
205	11/13	put	12	19	+7
207.5	11/13	call	19	19	0
207.5	11/13	put	16	20	+4
210	11/13	call	101	101	0
210	11/13	put	16	15	-1
212.5	11/13	call	17	17	0
212.5	11/13	put	3	3	0
215	11/13	call	21	20	-1
215	11/13	put	3	4	+1
217.5	11/13	call	4	4	0
217.5	11/13	put	71	95	+24
220	11/13	call	19	18	-1
220	11/13	put	2	7	+5
222.5	11/13	call	16	21	+5
222.5	11/13	put	7	45	+38
225	11/13	call	27	28	+1
225	11/13	put	6	10	+4
230	11/13	call	26	31	+5
230	11/13	put	5	6	+1
235	11/13	call	233	236	+3
235	11/13	put	3	4	+1
240	11/13	call	31	52	+21
245	11/13	call	26	27	+1
250	11/13	call	71	74	+3
250	11/13	put	2	2	0
255	11/13	call	66	77	+11
260	11/13	call	245	251	+6
265	11/13	call	6	6	0
270	11/13	call	6	9	+3
275	11/13	call	2	3	+1
280	11/13	call	16	16	0
285	11/13	call	1	1	0
295	11/13	call	2	2	0
300	11/13	call	5	6	+1
300	11/13	put	0	1	+1

Expiration 2026-11-20

ZS open interest, settled 2026-10-21, expiration 2026-11-20, strikes 145 to 320

Strike	Expiry	Type	Prior OI	Settled OI	Change
145	11/20	call	50	50	0
145	11/20	put	343	343	0
150	11/20	call	169	169	0
150	11/20	put	547	545	-2
155	11/20	call	135	138	+3
155	11/20	put	994	994	0
160	11/20	call	135	135	0
160	11/20	put	387	400	+13
165	11/20	call	117	117	0
165	11/20	put	474	474	0
170	11/20	call	1,390	1,390	0
170	11/20	put	778	733	-45
175	11/20	call	263	263	0
175	11/20	put	462	457	-5
180	11/20	call	726	723	-3
180	11/20	put	1,378	1,453	+75
182.5	11/20	put	0	2	+2
185	11/20	call	158	157	-1
185	11/20	put	688	811	+123
187.5	11/20	put	3	4	+1
190	11/20	call	811	811	0
190	11/20	put	1,648	1,428	-220
192.5	11/20	put	0	1	+1
195	11/20	call	196	196	0
195	11/20	put	306	294	-12
197.5	11/20	call	0	1	+1
197.5	11/20	put	26	26	0
200	11/20	call	808	807	-1
200	11/20	put	1,892	1,789	-103
202.5	11/20	call	5	5	0
202.5	11/20	put	9	11	+2
205	11/20	call	18	18	0
205	11/20	put	47	53	+6
207.5	11/20	call	71	71	0
207.5	11/20	put	93	68	-25
210	11/20	call	1,008	1,005	-3
210	11/20	put	946	917	-29
212.5	11/20	call	58	58	0
212.5	11/20	put	26	25	-1
215	11/20	call	52	51	-1
215	11/20	put	14	16	+2
217.5	11/20	call	15	15	0
217.5	11/20	put	5	6	+1
220	11/20	call	2,811	2,721	-90
220	11/20	put	225	230	+5
222.5	11/20	call	15	18	+3
222.5	11/20	put	0	7	+7
225	11/20	call	185	190	+5
225	11/20	put	20	32	+12
227.5	11/20	call	13	33	+20
227.5	11/20	put	1	7	+6
230	11/20	call	1,950	1,898	-52
230	11/20	put	166	215	+49
235	11/20	call	6	45	+39
235	11/20	put	1	23	+22
240	11/20	call	1,506	1,468	-38
240	11/20	put	205	231	+26
245	11/20	call	13	18	+5
245	11/20	put	0	17	+17
250	11/20	call	1,579	1,699	+120
250	11/20	put	13	13	0
255	11/20	call	11	158	+147
260	11/20	call	1,196	1,191	-5
270	11/20	call	2,376	2,392	+16
280	11/20	call	206	220	+14
280	11/20	put	10	10	0
290	11/20	call	35	80	+45
300	11/20	call	130	146	+16
310	11/20	call	35	42	+7
320	11/20	call	25	92	+67

Expiration 2026-11-27

ZS open interest, settled 2026-10-21, expiration 2026-11-27, strikes 135 to 310

Strike	Expiry	Type	Prior OI	Settled OI	Change
135	11/27	call	1	1	0
145	11/27	call	1	1	0
145	11/27	put	1	1	0
150	11/27	put	13	13	0
155	11/27	put	2	4	+2
160	11/27	put	12	14	+2
165	11/27	put	1	1	0
170	11/27	call	2	2	0
170	11/27	put	7	9	+2
175	11/27	call	2	2	0
175	11/27	put	4	4	0
180	11/27	put	8	9	+1
185	11/27	call	7	7	0
185	11/27	put	15	24	+9
190	11/27	call	4	6	+2
190	11/27	put	24	24	0
195	11/27	call	5	7	+2
195	11/27	put	18	18	0
200	11/27	call	35	35	0
200	11/27	put	14	23	+9
205	11/27	call	12	12	0
205	11/27	put	4	7	+3
210	11/27	call	13	12	-1
210	11/27	put	17	19	+2
215	11/27	call	19	18	-1
215	11/27	put	9	11	+2
220	11/27	call	17	18	+1
220	11/27	put	23	25	+2
225	11/27	call	19	19	0
225	11/27	put	15	168	+153
230	11/27	call	41	42	+1
230	11/27	put	5	6	+1
235	11/27	call	18	18	0
240	11/27	call	17	16	-1
245	11/27	call	5	6	+1
250	11/27	call	101	102	+1
250	11/27	put	14	14	0
255	11/27	call	26	26	0
260	11/27	call	28	29	+1
265	11/27	call	1	11	+10
270	11/27	call	4	14	+10
270	11/27	put	1	1	0
275	11/27	call	0	9	+9
280	11/27	call	1	3	+2
285	11/27	call	13	54	+41
290	11/27	call	2	6	+4
295	11/27	call	10	10	0
300	11/27	call	1	7	+6
310	11/27	call	0	16	+16

Later expirations (2026-12-18, 2027-01-15, 2027-02-19, 2027-03-19, 2027-05-21, 2027-06-17, 2027-09-17, 2028-01-21, 2028-06-16, 2029-01-19) and all other strikes are in the Markdown table.

Markdown table | Open interest changes across symbols

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