CAT Options Open Interest by Strike, Oct 21 Settlement

CAT 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 17 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, 2,572 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 592 to 888. Source: SquawkFlow's archive of settled open interest. Counts are contracts, not trades; they do not identify which side opened or closed a position.

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

Strike	Expiry	Type	Prior OI	Settled OI	Change
720	10/23	put	141	451	+310
690	10/23	call	408	137	-271
685	10/23	call	402	132	-270
530	01/21	put	49	249	+200
1,200	12/18	call	171	364	+193
760	10/23	call	197	363	+166
640	01/21	put	617	742	+125
680	03/19	put	380	493	+113
510	01/19	put	0	100	+100
900	10/30	call	120	218	+98
735	11/06	call	123	221	+98
1,210	10/30	call	13	105	+92
680	06/17	put	665	754	+89
640	06/17	put	377	452	+75
1,580	06/17	call	205	271	+66

Expiration 2026-10-23

CAT open interest, settled 2026-10-21, expiration 2026-10-23, strikes 680 to 802.5

Strike	Expiry	Type	Prior OI	Settled OI	Change
680	10/23	call	1	1	0
680	10/23	put	705	733	+28
682.5	10/23	put	24	24	0
685	10/23	call	402	132	-270
685	10/23	put	154	167	+13
687.5	10/23	put	261	262	+1
690	10/23	call	408	137	-271
690	10/23	put	210	217	+7
692.5	10/23	call	14	14	0
692.5	10/23	put	17	18	+1
695	10/23	call	25	25	0
695	10/23	put	233	244	+11
697.5	10/23	call	4	4	0
697.5	10/23	put	39	49	+10
700	10/23	call	34	34	0
700	10/23	put	665	711	+46
702.5	10/23	call	17	17	0
702.5	10/23	put	38	37	-1
705	10/23	call	7	7	0
705	10/23	put	51	54	+3
707.5	10/23	call	50	50	0
707.5	10/23	put	17	32	+15
710	10/23	call	35	40	+5
710	10/23	put	221	235	+14
712.5	10/23	call	17	17	0
712.5	10/23	put	16	29	+13
715	10/23	call	13	13	0
715	10/23	put	74	79	+5
717.5	10/23	call	27	27	0
717.5	10/23	put	10	28	+18
720	10/23	call	75	70	-5
720	10/23	put	141	451	+310
722.5	10/23	call	23	24	+1
722.5	10/23	put	23	31	+8
725	10/23	call	71	65	-6
725	10/23	put	122	125	+3
727.5	10/23	call	26	26	0
727.5	10/23	put	36	44	+8
730	10/23	call	89	109	+20
730	10/23	put	180	172	-8
732.5	10/23	call	72	70	-2
732.5	10/23	put	30	29	-1
735	10/23	call	137	139	+2
735	10/23	put	354	357	+3
737.5	10/23	call	27	27	0
737.5	10/23	put	35	33	-2
740	10/23	call	101	114	+13
740	10/23	put	945	940	-5
742.5	10/23	call	23	26	+3
742.5	10/23	put	88	88	0
745	10/23	call	183	180	-3
745	10/23	put	337	294	-43
747.5	10/23	call	43	44	+1
747.5	10/23	put	10	10	0
750	10/23	call	334	349	+15
750	10/23	put	377	374	-3
755	10/23	call	343	400	+57
755	10/23	put	409	404	-5
760	10/23	call	197	363	+166
760	10/23	put	194	132	-62
765	10/23	call	150	193	+43
765	10/23	put	238	178	-60
770	10/23	call	167	190	+23
770	10/23	put	164	160	-4
775	10/23	call	358	386	+28
775	10/23	put	70	70	0
780	10/23	call	215	258	+43
780	10/23	put	323	317	-6
785	10/23	call	238	259	+21
785	10/23	put	350	337	-13
790	10/23	call	160	166	+6
790	10/23	put	200	200	0
795	10/23	call	86	86	0
795	10/23	put	408	392	-16
800	10/23	call	677	679	+2
800	10/23	put	169	162	-7
802.5	10/23	call	61	69	+8
802.5	10/23	put	23	20	-3

Expiration 2026-10-30

CAT open interest, settled 2026-10-21, expiration 2026-10-30, strikes 677.5 to 805

Strike	Expiry	Type	Prior OI	Settled OI	Change
677.5	10/30	put	0	3	+3
680	10/30	call	5	5	0
680	10/30	put	52	56	+4
682.5	10/30	put	0	3	+3
685	10/30	call	3	3	0
685	10/30	put	61	62	+1
687.5	10/30	put	0	4	+4
690	10/30	call	6	6	0
690	10/30	put	196	197	+1
692.5	10/30	put	0	1	+1
695	10/30	call	7	7	0
695	10/30	put	194	194	0
697.5	10/30	put	2	2	0
700	10/30	call	5	4	-1
700	10/30	put	311	312	+1
705	10/30	call	9	9	0
705	10/30	put	69	69	0
707.5	10/30	put	2	2	0
710	10/30	call	8	8	0
710	10/30	put	130	129	-1
715	10/30	call	18	18	0
715	10/30	put	80	83	+3
717.5	10/30	call	3	3	0
717.5	10/30	put	20	20	0
720	10/30	call	35	39	+4
720	10/30	put	225	226	+1
722.5	10/30	put	1	1	0
725	10/30	call	28	28	0
725	10/30	put	402	412	+10
727.5	10/30	call	13	13	0
727.5	10/30	put	9	9	0
730	10/30	call	91	93	+2
730	10/30	put	282	296	+14
732.5	10/30	call	2	4	+2
732.5	10/30	put	0	6	+6
735	10/30	call	36	39	+3
735	10/30	put	113	113	0
737.5	10/30	call	1	13	+12
737.5	10/30	put	0	15	+15
740	10/30	call	65	69	+4
740	10/30	put	181	182	+1
742.5	10/30	call	0	3	+3
742.5	10/30	put	0	1	+1
745	10/30	call	21	22	+1
745	10/30	put	153	152	-1
747.5	10/30	call	0	2	+2
750	10/30	call	78	87	+9
750	10/30	put	189	195	+6
755	10/30	call	40	41	+1
755	10/30	put	97	96	-1
760	10/30	call	50	58	+8
760	10/30	put	139	140	+1
765	10/30	call	50	54	+4
765	10/30	put	107	108	+1
770	10/30	call	44	44	0
770	10/30	put	114	116	+2
775	10/30	call	52	52	0
775	10/30	put	51	50	-1
780	10/30	call	67	72	+5
780	10/30	put	72	73	+1
785	10/30	call	149	161	+12
785	10/30	put	39	38	-1
790	10/30	call	72	73	+1
790	10/30	put	60	62	+2
795	10/30	call	43	48	+5
795	10/30	put	105	107	+2
800	10/30	call	309	320	+11
800	10/30	put	160	156	-4
802.5	10/30	call	25	26	+1
802.5	10/30	put	12	12	0
805	10/30	call	55	63	+8
805	10/30	put	181	183	+2

Expiration 2026-11-06

CAT open interest, settled 2026-10-21, expiration 2026-11-06, strikes 665 to 820

Strike	Expiry	Type	Prior OI	Settled OI	Change
665	11/06	call	2	2	0
665	11/06	put	101	108	+7
670	11/06	call	1	1	0
670	11/06	put	104	105	+1
675	11/06	call	10	10	0
675	11/06	put	93	93	0
680	11/06	call	11	11	0
680	11/06	put	21	18	-3
685	11/06	call	45	45	0
685	11/06	put	31	31	0
690	11/06	call	6	5	-1
690	11/06	put	24	24	0
695	11/06	call	12	12	0
695	11/06	put	19	19	0
700	11/06	call	8	8	0
700	11/06	put	33	35	+2
705	11/06	call	9	9	0
705	11/06	put	53	53	0
710	11/06	call	28	28	0
710	11/06	put	112	112	0
712.5	11/06	call	10	10	0
712.5	11/06	put	10	10	0
715	11/06	call	17	17	0
715	11/06	put	107	107	0
717.5	11/06	call	6	7	+1
717.5	11/06	put	24	24	0
720	11/06	call	11	10	-1
720	11/06	put	144	143	-1
722.5	11/06	call	1	1	0
722.5	11/06	put	2	2	0
725	11/06	call	10	10	0
725	11/06	put	44	47	+3
727.5	11/06	call	36	36	0
727.5	11/06	put	42	42	0
730	11/06	call	54	54	0
730	11/06	put	44	45	+1
732.5	11/06	call	28	27	-1
732.5	11/06	put	18	19	+1
735	11/06	call	123	221	+98
735	11/06	put	23	24	+1
737.5	11/06	call	1	1	0
737.5	11/06	put	14	14	0
740	11/06	call	56	55	-1
740	11/06	put	65	65	0
742.5	11/06	put	4	4	0
745	11/06	call	6	9	+3
745	11/06	put	20	20	0
747.5	11/06	call	1	1	0
747.5	11/06	put	0	1	+1
750	11/06	call	393	393	0
750	11/06	put	83	83	0
755	11/06	call	24	26	+2
755	11/06	put	29	29	0
760	11/06	call	374	377	+3
760	11/06	put	77	77	0
765	11/06	call	35	35	0
765	11/06	put	72	73	+1
770	11/06	call	17	17	0
770	11/06	put	63	63	0
775	11/06	call	17	20	+3
775	11/06	put	17	17	0
780	11/06	call	30	30	0
780	11/06	put	46	46	0
785	11/06	call	8	9	+1
785	11/06	put	17	17	0
790	11/06	call	40	40	0
790	11/06	put	99	99	0
795	11/06	call	18	19	+1
795	11/06	put	7	7	0
800	11/06	call	81	86	+5
800	11/06	put	40	40	0
805	11/06	call	45	45	0
805	11/06	put	19	19	0
810	11/06	call	108	108	0
810	11/06	put	136	136	0
815	11/06	call	85	85	0
815	11/06	put	12	12	0
820	11/06	call	53	54	+1
820	11/06	put	25	25	0

Expiration 2026-11-13

CAT open interest, settled 2026-10-21, expiration 2026-11-13, strikes 645 to 840

Strike	Expiry	Type	Prior OI	Settled OI	Change
645	11/13	call	13	13	0
645	11/13	put	6	7	+1
650	11/13	call	2	2	0
650	11/13	put	41	42	+1
655	11/13	call	3	3	0
655	11/13	put	15	15	0
660	11/13	call	2	2	0
660	11/13	put	51	51	0
665	11/13	call	3	3	0
665	11/13	put	64	64	0
670	11/13	call	4	4	0
670	11/13	put	25	25	0
675	11/13	call	2	2	0
675	11/13	put	16	17	+1
680	11/13	call	22	22	0
680	11/13	put	27	28	+1
685	11/13	call	11	11	0
685	11/13	put	7	7	0
690	11/13	call	11	11	0
690	11/13	put	47	47	0
695	11/13	call	8	8	0
695	11/13	put	29	34	+5
700	11/13	call	27	28	+1
700	11/13	put	55	55	0
705	11/13	call	11	11	0
705	11/13	put	33	32	-1
710	11/13	call	3	3	0
710	11/13	put	50	50	0
715	11/13	call	8	8	0
715	11/13	put	17	17	0
720	11/13	call	3	3	0
720	11/13	put	545	545	0
725	11/13	call	13	13	0
725	11/13	put	55	54	-1
730	11/13	call	11	12	+1
730	11/13	put	28	28	0
735	11/13	call	8	9	+1
735	11/13	put	33	35	+2
740	11/13	call	8	12	+4
740	11/13	put	34	34	0
745	11/13	call	16	18	+2
745	11/13	put	53	53	0
750	11/13	call	11	12	+1
750	11/13	put	63	65	+2
755	11/13	call	9	12	+3
755	11/13	put	35	35	0
760	11/13	call	22	23	+1
760	11/13	put	44	44	0
765	11/13	call	21	22	+1
765	11/13	put	41	41	0
770	11/13	call	8	8	0
770	11/13	put	41	42	+1
775	11/13	call	23	22	-1
775	11/13	put	28	28	0
780	11/13	call	12	12	0
780	11/13	put	54	54	0
785	11/13	call	9	9	0
785	11/13	put	39	39	0
790	11/13	call	34	41	+7
790	11/13	put	18	19	+1
795	11/13	call	54	54	0
795	11/13	put	22	21	-1
800	11/13	call	14	13	-1
800	11/13	put	31	30	-1
805	11/13	call	28	28	0
805	11/13	put	156	155	-1
810	11/13	call	11	13	+2
810	11/13	put	28	28	0
815	11/13	call	18	17	-1
815	11/13	put	21	21	0
820	11/13	call	17	17	0
820	11/13	put	9	9	0
825	11/13	call	11	11	0
825	11/13	put	6	6	0
830	11/13	call	33	33	0
830	11/13	put	8	8	0
835	11/13	call	87	87	0
835	11/13	put	10	10	0
840	11/13	call	12	12	0
840	11/13	put	32	32	0

Expiration 2026-11-20

CAT open interest, settled 2026-10-21, expiration 2026-11-20, strikes 630 to 850

Strike	Expiry	Type	Prior OI	Settled OI	Change
630	11/20	call	19	19	0
630	11/20	put	199	209	+10
640	11/20	call	23	23	0
640	11/20	put	272	276	+4
650	11/20	call	41	41	0
650	11/20	put	450	433	-17
660	11/20	call	54	54	0
660	11/20	put	419	430	+11
670	11/20	call	74	74	0
670	11/20	put	305	313	+8
680	11/20	call	176	176	0
680	11/20	put	270	274	+4
685	11/20	call	11	11	0
685	11/20	put	20	20	0
690	11/20	call	51	51	0
690	11/20	put	344	343	-1
695	11/20	call	17	17	0
695	11/20	put	17	18	+1
700	11/20	call	107	107	0
700	11/20	put	1,143	1,155	+12
705	11/20	call	17	17	0
705	11/20	put	3	3	0
710	11/20	call	52	52	0
710	11/20	put	582	582	0
712.5	11/20	call	5	5	0
712.5	11/20	put	1	2	+1
715	11/20	call	1	1	0
715	11/20	put	1	6	+5
717.5	11/20	call	11	11	0
717.5	11/20	put	10	10	0
720	11/20	call	57	57	0
720	11/20	put	523	577	+54
722.5	11/20	call	1	1	0
722.5	11/20	put	2	2	0
725	11/20	call	46	50	+4
725	11/20	put	62	62	0
727.5	11/20	put	4	4	0
730	11/20	call	155	156	+1
730	11/20	put	495	495	0
732.5	11/20	call	36	36	0
732.5	11/20	put	3	10	+7
735	11/20	call	44	46	+2
735	11/20	put	9	9	0
737.5	11/20	call	0	1	+1
737.5	11/20	put	6	6	0
740	11/20	call	601	625	+24
740	11/20	put	537	548	+11
742.5	11/20	call	2	7	+5
742.5	11/20	put	3	3	0
745	11/20	call	1	7	+6
745	11/20	put	6	6	0
750	11/20	call	196	192	-4
750	11/20	put	811	811	0
755	11/20	call	24	25	+1
760	11/20	call	396	400	+4
760	11/20	put	692	690	-2
765	11/20	call	0	1	+1
765	11/20	put	1	1	0
770	11/20	call	136	145	+9
770	11/20	put	420	432	+12
775	11/20	call	8	12	+4
780	11/20	call	163	169	+6
780	11/20	put	499	498	-1
790	11/20	call	107	114	+7
790	11/20	put	459	459	0
800	11/20	call	802	785	-17
800	11/20	put	737	736	-1
810	11/20	call	494	505	+11
810	11/20	put	479	478	-1
820	11/20	call	323	338	+15
820	11/20	put	316	316	0
830	11/20	call	297	299	+2
830	11/20	put	269	269	0
840	11/20	call	325	329	+4
840	11/20	put	127	126	-1
850	11/20	call	612	622	+10
850	11/20	put	154	153	-1

Expiration 2026-11-27

CAT open interest, settled 2026-10-21, expiration 2026-11-27, strikes 645 to 840

Strike	Expiry	Type	Prior OI	Settled OI	Change
645	11/27	put	2	6	+4
650	11/27	put	14	14	0
655	11/27	put	28	28	0
660	11/27	call	1	1	0
660	11/27	put	24	25	+1
665	11/27	call	24	24	0
665	11/27	put	5	6	+1
670	11/27	call	2	3	+1
670	11/27	put	30	30	0
675	11/27	call	4	4	0
675	11/27	put	33	33	0
680	11/27	put	24	25	+1
685	11/27	call	4	4	0
685	11/27	put	11	11	0
690	11/27	put	5	5	0
695	11/27	call	8	9	+1
695	11/27	put	12	12	0
700	11/27	call	7	7	0
700	11/27	put	41	50	+9
705	11/27	call	1	1	0
705	11/27	put	11	11	0
710	11/27	call	3	3	0
710	11/27	put	10	11	+1
715	11/27	call	2	3	+1
715	11/27	put	13	12	-1
720	11/27	call	2	2	0
720	11/27	put	10	13	+3
725	11/27	call	3	3	0
725	11/27	put	18	18	0
730	11/27	call	24	24	0
730	11/27	put	12	13	+1
735	11/27	call	21	20	-1
735	11/27	put	8	8	0
740	11/27	call	2	3	+1
740	11/27	put	11	11	0
745	11/27	call	2	3	+1
745	11/27	put	17	17	0
750	11/27	call	8	8	0
750	11/27	put	13	14	+1
755	11/27	call	29	29	0
755	11/27	put	9	7	-2
760	11/27	call	9	9	0
760	11/27	put	26	26	0
765	11/27	call	10	10	0
765	11/27	put	9	9	0
770	11/27	call	4	3	-1
770	11/27	put	23	23	0
775	11/27	call	32	33	+1
775	11/27	put	8	8	0
780	11/27	call	22	24	+2
780	11/27	put	38	39	+1
785	11/27	call	31	31	0
785	11/27	put	6	2	-4
790	11/27	call	58	59	+1
790	11/27	put	200	200	0
795	11/27	call	31	31	0
795	11/27	put	3	3	0
800	11/27	call	64	63	-1
800	11/27	put	33	33	0
805	11/27	call	19	19	0
805	11/27	put	16	12	-4
810	11/27	call	29	29	0
810	11/27	put	1	1	0
815	11/27	call	10	10	0
815	11/27	put	73	73	0
820	11/27	call	16	17	+1
820	11/27	put	3	3	0
825	11/27	call	30	30	0
825	11/27	put	5	5	0
830	11/27	call	29	30	+1
830	11/27	put	7	7	0
835	11/27	call	17	17	0
840	11/27	call	22	22	0
840	11/27	put	21	21	0

Later expirations (2026-12-18, 2027-01-15, 2027-02-19, 2027-03-19, 2027-05-21, 2027-06-17, 2027-09-17, 2027-12-17, 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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