ZTS Options Open Interest by Strike, Oct 21 Settlement

ZTS 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 9 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, 342 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 64 to 96. Source: SquawkFlow's archive of settled open interest. Counts are contracts, not trades; they do not identify which side opened or closed a position.

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

Strike	Expiry	Type	Prior OI	Settled OI	Change
65	11/20	put	2,328	2,817	+489
70	01/15	put	1,781	2,050	+269
80	11/20	call	2,279	2,541	+262
90	11/20	call	869	1,018	+149
65	12/18	put	1,900	2,040	+140
85	01/15	call	1,706	1,820	+114
85	11/20	call	2,066	2,176	+110
105	01/19	call	39	97	+58
75	11/20	put	674	729	+55
70	12/18	put	1,602	1,653	+51
100	01/21	put	304	254	-50
70	11/20	put	1,624	1,673	+49
80	11/20	put	271	320	+49
85	12/18	call	607	650	+43
95	11/20	call	240	277	+37

Expiration 2026-11-20

ZTS open interest, settled 2026-10-21, expiration 2026-11-20, strikes 40 to 110

Strike	Expiry	Type	Prior OI	Settled OI	Change
40	11/20	call	2	2	0
50	11/20	put	1,225	1,225	0
55	11/20	call	2	2	0
55	11/20	put	755	755	0
60	11/20	call	6	6	0
60	11/20	put	1,013	1,014	+1
65	11/20	call	96	96	0
65	11/20	put	2,328	2,817	+489
70	11/20	call	781	781	0
70	11/20	put	1,624	1,673	+49
75	11/20	call	1,514	1,536	+22
75	11/20	put	674	729	+55
80	11/20	call	2,279	2,541	+262
80	11/20	put	271	320	+49
85	11/20	call	2,066	2,176	+110
85	11/20	put	29	28	-1
90	11/20	call	869	1,018	+149
90	11/20	put	3	3	0
95	11/20	call	240	277	+37
100	11/20	call	63	70	+7
105	11/20	call	2	2	0
105	11/20	put	3	3	0
110	11/20	call	6	12	+6
110	11/20	put	3	3	0

Expiration 2026-12-18

ZTS open interest, settled 2026-10-21, expiration 2026-12-18, strikes 40 to 200

Strike	Expiry	Type	Prior OI	Settled OI	Change
40	12/18	call	4	4	0
40	12/18	put	5	5	0
45	12/18	call	4	4	0
45	12/18	put	1,056	1,056	0
50	12/18	call	18	18	0
50	12/18	put	156	156	0
55	12/18	call	4	4	0
55	12/18	put	592	592	0
60	12/18	call	35	35	0
60	12/18	put	2,323	2,322	-1
65	12/18	call	38	38	0
65	12/18	put	1,900	2,040	+140
70	12/18	call	144	143	-1
70	12/18	put	1,602	1,653	+51
75	12/18	call	1,529	1,527	-2
75	12/18	put	940	954	+14
80	12/18	call	673	681	+8
80	12/18	put	369	370	+1
85	12/18	call	607	650	+43
85	12/18	put	350	350	0
90	12/18	call	970	973	+3
90	12/18	put	64	64	0
95	12/18	call	324	347	+23
95	12/18	put	43	43	0
100	12/18	call	776	779	+3
100	12/18	put	189	189	0
105	12/18	call	242	242	0
105	12/18	put	24	24	0
110	12/18	call	126	126	0
115	12/18	call	186	186	0
120	12/18	call	240	240	0
125	12/18	call	76	76	0
130	12/18	call	74	74	0
135	12/18	call	19	19	0
140	12/18	call	40	40	0
145	12/18	call	70	70	0
150	12/18	call	87	87	0
155	12/18	call	17	17	0
160	12/18	call	17	17	0
165	12/18	call	16	16	0
170	12/18	call	22	22	0
175	12/18	call	4	4	0
180	12/18	call	1	1	0
200	12/18	call	102	102	0

Expiration 2027-01-15

ZTS open interest, settled 2026-10-21, expiration 2027-01-15, strikes 40 to 270

Strike	Expiry	Type	Prior OI	Settled OI	Change
40	01/15	call	15	15	0
40	01/15	put	2,180	2,180	0
45	01/15	call	6	6	0
45	01/15	put	3,338	3,338	0
50	01/15	call	131	131	0
50	01/15	put	315	315	0
55	01/15	call	5	5	0
55	01/15	put	249	249	0
60	01/15	call	243	242	-1
60	01/15	put	1,801	1,801	0
65	01/15	call	49	47	-2
65	01/15	put	2,307	2,307	0
70	01/15	call	230	228	-2
70	01/15	put	1,781	2,050	+269
75	01/15	call	604	611	+7
75	01/15	put	2,842	2,833	-9
80	01/15	call	1,098	1,101	+3
80	01/15	put	688	688	0
85	01/15	call	1,706	1,820	+114
85	01/15	put	143	143	0
90	01/15	call	1,654	1,664	+10
90	01/15	put	113	113	0
95	01/15	call	790	793	+3
95	01/15	put	40	40	0
100	01/15	call	1,198	1,201	+3
100	01/15	put	76	76	0
105	01/15	call	3,730	3,750	+20
105	01/15	put	62	62	0
110	01/15	call	415	415	0
110	01/15	put	67	67	0
115	01/15	call	795	795	0
115	01/15	put	5	5	0
120	01/15	call	179	179	0
120	01/15	put	9	9	0
125	01/15	call	216	216	0
125	01/15	put	3	3	0
130	01/15	call	174	174	0
130	01/15	put	1	1	0
135	01/15	call	64	64	0
135	01/15	put	1	1	0
140	01/15	call	333	333	0
140	01/15	put	1	1	0
145	01/15	call	70	70	0
145	01/15	put	1	1	0
150	01/15	call	1,426	1,426	0
150	01/15	put	1	1	0
155	01/15	call	57	57	0
155	01/15	put	1	1	0
160	01/15	call	85	85	0
160	01/15	put	10	10	0
165	01/15	call	93	93	0
170	01/15	call	76	76	0
175	01/15	call	3,824	3,824	0
180	01/15	call	38	38	0
185	01/15	call	34	34	0
190	01/15	call	13	13	0
195	01/15	call	74	74	0
200	01/15	call	56	56	0
210	01/15	call	25	25	0
220	01/15	call	23	23	0
230	01/15	call	6	6	0
240	01/15	call	5	5	0
250	01/15	call	33	33	0
260	01/15	call	5	5	0
270	01/15	call	30	30	0

Expiration 2027-03-19

ZTS open interest, settled 2026-10-21, expiration 2027-03-19, strikes 40 to 170

Strike	Expiry	Type	Prior OI	Settled OI	Change
40	03/19	call	1	1	0
40	03/19	put	1,281	1,281	0
45	03/19	call	2	2	0
45	03/19	put	2,567	2,567	0
50	03/19	call	19	19	0
50	03/19	put	925	925	0
55	03/19	call	22	22	0
55	03/19	put	380	380	0
60	03/19	call	26	26	0
60	03/19	put	620	621	+1
65	03/19	call	87	87	0
65	03/19	put	694	691	-3
70	03/19	call	152	152	0
70	03/19	put	660	660	0
75	03/19	call	955	955	0
75	03/19	put	507	507	0
80	03/19	call	997	998	+1
80	03/19	put	239	238	-1
85	03/19	call	882	882	0
85	03/19	put	130	130	0
90	03/19	call	2,243	2,242	-1
90	03/19	put	553	555	+2
95	03/19	call	1,008	1,008	0
95	03/19	put	9	9	0
100	03/19	call	1,211	1,211	0
100	03/19	put	21	21	0
105	03/19	call	72	72	0
105	03/19	put	52	52	0
110	03/19	call	123	123	0
110	03/19	put	18	18	0
115	03/19	call	77	77	0
115	03/19	put	21	21	0
120	03/19	call	72	72	0
125	03/19	call	78	78	0
130	03/19	call	13	13	0
135	03/19	call	2	2	0
140	03/19	call	36	36	0
145	03/19	call	1	1	0
150	03/19	call	42	42	0
165	03/19	call	10	10	0
170	03/19	call	1	1	0

Expiration 2027-04-16

ZTS open interest, settled 2026-10-21, expiration 2027-04-16, strikes 45 to 115

Strike	Expiry	Type	Prior OI	Settled OI	Change
45	04/16	put	483	483	0
50	04/16	put	10	14	+4
55	04/16	call	2	2	0
55	04/16	put	26	30	+4
60	04/16	put	75	75	0
65	04/16	put	78	80	+2
70	04/16	call	8	8	0
70	04/16	put	75	75	0
75	04/16	call	6	6	0
75	04/16	put	47	47	0
80	04/16	call	238	238	0
80	04/16	put	59	89	+30
85	04/16	call	28	28	0
85	04/16	put	2	18	+16
90	04/16	call	12	16	+4
95	04/16	call	8	10	+2
100	04/16	call	78	78	0
105	04/16	call	8	8	0
110	04/16	call	12	12	0
115	04/16	call	29	29	0

Expiration 2027-06-17

ZTS open interest, settled 2026-10-21, expiration 2027-06-17, strikes 40 to 115

Strike	Expiry	Type	Prior OI	Settled OI	Change
40	06/17	call	35	55	+20
40	06/17	put	411	410	-1
45	06/17	call	13	13	0
45	06/17	put	2	2	0
50	06/17	call	647	647	0
50	06/17	put	41	41	0
55	06/17	call	32	32	0
55	06/17	put	127	127	0
60	06/17	call	22	22	0
60	06/17	put	128	128	0
65	06/17	call	87	87	0
65	06/17	put	237	237	0
70	06/17	call	72	72	0
70	06/17	put	292	292	0
75	06/17	call	171	171	0
75	06/17	put	235	235	0
80	06/17	call	165	165	0
80	06/17	put	98	98	0
85	06/17	call	360	359	-1
85	06/17	put	52	52	0
90	06/17	call	148	148	0
90	06/17	put	2	2	0
95	06/17	call	279	279	0
95	06/17	put	3	3	0
100	06/17	call	512	512	0
100	06/17	put	23	23	0
105	06/17	call	46	46	0
105	06/17	put	3	3	0
110	06/17	call	46	46	0
110	06/17	put	4	4	0
115	06/17	call	68	62	-6
115	06/17	put	1	1	0

Later expirations (2027-09-17, 2028-01-21, 2029-01-19) and all other strikes are in the Markdown table.

Markdown table | Open interest changes across symbols

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