COST Options Open Interest by Strike, Oct 21 Settlement

COST 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 18 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, 2,564 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 799 to 1,199. Source: SquawkFlow's archive of settled open interest. Counts are contracts, not trades; they do not identify which side opened or closed a position.

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

Strike	Expiry	Type	Prior OI	Settled OI	Change
1,025	10/23	call	570	1,390	+820
1,020	10/30	call	156	573	+417
1,015	10/30	call	189	520	+331
1,010	10/23	call	831	593	-238
955	10/30	put	115	306	+191
952.5	10/30	put	103	293	+190
1,010	10/30	call	203	384	+181
1,000	10/30	call	364	536	+172
1,015	10/23	call	803	659	-144
1,000	11/20	call	1,668	1,787	+119
970	11/13	call	57	174	+117
795	10/23	put	135	236	+101
1,320	01/21	call	142	235	+93
960	11/06	put	46	129	+83
540	11/27	put	1,443	1,520	+77

Expiration 2026-10-23

COST open interest, settled 2026-10-21, expiration 2026-10-23, strikes 920 to 1,080

Strike	Expiry	Type	Prior OI	Settled OI	Change
920	10/23	call	123	122	-1
920	10/23	put	261	260	-1
922.5	10/23	call	3	3	0
922.5	10/23	put	92	91	-1
925	10/23	call	70	69	-1
925	10/23	put	317	321	+4
927.5	10/23	call	2	2	0
927.5	10/23	put	38	38	0
930	10/23	call	130	130	0
930	10/23	put	105	102	-3
935	10/23	call	92	92	0
935	10/23	put	243	243	0
937.5	10/23	call	6	6	0
937.5	10/23	put	227	230	+3
940	10/23	call	224	224	0
940	10/23	put	413	420	+7
942.5	10/23	call	4	4	0
942.5	10/23	put	61	61	0
945	10/23	call	158	158	0
945	10/23	put	178	176	-2
947.5	10/23	call	26	26	0
947.5	10/23	put	66	72	+6
950	10/23	call	189	184	-5
950	10/23	put	581	567	-14
952.5	10/23	call	27	27	0
952.5	10/23	put	597	606	+9
955	10/23	call	170	167	-3
955	10/23	put	256	272	+16
957.5	10/23	call	23	23	0
957.5	10/23	put	53	55	+2
960	10/23	call	223	221	-2
960	10/23	put	689	716	+27
965	10/23	call	109	107	-2
965	10/23	put	347	349	+2
970	10/23	call	207	196	-11
970	10/23	put	394	418	+24
975	10/23	call	172	164	-8
975	10/23	put	288	315	+27
980	10/23	call	214	193	-21
980	10/23	put	214	286	+72
985	10/23	call	354	352	-2
985	10/23	put	451	464	+13
990	10/23	call	396	397	+1
990	10/23	put	532	584	+52
995	10/23	call	361	301	-60
995	10/23	put	73	86	+13
1,000	10/23	call	653	654	+1
1,000	10/23	put	149	156	+7
1,005	10/23	call	318	324	+6
1,005	10/23	put	34	34	0
1,010	10/23	call	831	593	-238
1,010	10/23	put	28	36	+8
1,015	10/23	call	803	659	-144
1,015	10/23	put	6	9	+3
1,020	10/23	call	1,106	1,146	+40
1,020	10/23	put	102	102	0
1,025	10/23	call	570	1,390	+820
1,025	10/23	put	92	92	0
1,030	10/23	call	2,196	2,200	+4
1,035	10/23	call	314	316	+2
1,040	10/23	call	2,458	2,402	-56
1,040	10/23	put	6	6	0
1,045	10/23	call	402	418	+16
1,050	10/23	call	677	634	-43
1,055	10/23	call	96	101	+5
1,060	10/23	call	171	171	0
1,065	10/23	call	99	96	-3
1,070	10/23	call	99	102	+3
1,075	10/23	call	104	103	-1
1,080	10/23	call	64	67	+3

Expiration 2026-10-30

COST open interest, settled 2026-10-21, expiration 2026-10-30, strikes 920 to 1,080

Strike	Expiry	Type	Prior OI	Settled OI	Change
920	10/30	call	262	261	-1
920	10/30	put	308	328	+20
922.5	10/30	put	123	127	+4
925	10/30	call	94	94	0
925	10/30	put	284	282	-2
927.5	10/30	put	10	31	+21
930	10/30	call	75	71	-4
930	10/30	put	419	426	+7
935	10/30	call	79	67	-12
935	10/30	put	233	243	+10
937.5	10/30	call	32	23	-9
937.5	10/30	put	18	19	+1
940	10/30	call	205	174	-31
940	10/30	put	320	318	-2
942.5	10/30	call	1	1	0
942.5	10/30	put	14	15	+1
945	10/30	call	83	83	0
945	10/30	put	434	419	-15
947.5	10/30	call	29	28	-1
947.5	10/30	put	50	50	0
950	10/30	call	295	263	-32
950	10/30	put	183	213	+30
952.5	10/30	call	2	2	0
952.5	10/30	put	103	293	+190
955	10/30	call	85	85	0
955	10/30	put	115	306	+191
957.5	10/30	call	2	2	0
957.5	10/30	put	99	112	+13
960	10/30	call	204	195	-9
960	10/30	put	303	300	-3
965	10/30	call	94	116	+22
965	10/30	put	67	84	+17
970	10/30	call	277	278	+1
970	10/30	put	292	309	+17
975	10/30	call	371	370	-1
975	10/30	put	181	184	+3
980	10/30	call	197	192	-5
980	10/30	put	92	95	+3
985	10/30	call	112	125	+13
985	10/30	put	73	76	+3
990	10/30	call	231	233	+2
990	10/30	put	163	171	+8
995	10/30	call	114	148	+34
995	10/30	put	51	76	+25
1,000	10/30	call	364	536	+172
1,000	10/30	put	13	16	+3
1,005	10/30	call	143	162	+19
1,005	10/30	put	5	6	+1
1,010	10/30	call	203	384	+181
1,010	10/30	put	10	9	-1
1,015	10/30	call	189	520	+331
1,015	10/30	put	2	3	+1
1,020	10/30	call	156	573	+417
1,020	10/30	put	8	8	0
1,025	10/30	call	177	212	+35
1,025	10/30	put	3	3	0
1,030	10/30	call	101	117	+16
1,030	10/30	put	6	6	0
1,035	10/30	call	45	46	+1
1,040	10/30	call	58	58	0
1,045	10/30	call	39	40	+1
1,050	10/30	call	417	429	+12
1,055	10/30	call	34	34	0
1,060	10/30	call	197	199	+2
1,065	10/30	call	116	115	-1
1,070	10/30	call	77	81	+4
1,075	10/30	call	41	57	+16
1,080	10/30	call	70	70	0

Expiration 2026-11-06

COST open interest, settled 2026-10-21, expiration 2026-11-06, strikes 900 to 1,095

Strike	Expiry	Type	Prior OI	Settled OI	Change
900	11/06	call	41	41	0
900	11/06	put	431	431	0
905	11/06	call	113	113	0
905	11/06	put	91	91	0
910	11/06	call	121	105	-16
910	11/06	put	350	339	-11
915	11/06	call	41	41	0
915	11/06	put	654	653	-1
920	11/06	call	213	206	-7
920	11/06	put	206	202	-4
925	11/06	call	237	237	0
925	11/06	put	294	279	-15
930	11/06	call	45	45	0
930	11/06	put	62	63	+1
935	11/06	call	29	29	0
935	11/06	put	148	154	+6
940	11/06	call	176	196	+20
940	11/06	put	348	351	+3
945	11/06	call	85	85	0
945	11/06	put	134	136	+2
950	11/06	call	138	151	+13
950	11/06	put	105	106	+1
955	11/06	call	34	34	0
955	11/06	put	33	35	+2
960	11/06	call	83	78	-5
960	11/06	put	46	129	+83
965	11/06	call	44	45	+1
965	11/06	put	32	107	+75
970	11/06	call	109	109	0
970	11/06	put	23	25	+2
975	11/06	call	42	43	+1
975	11/06	put	185	184	-1
980	11/06	call	85	86	+1
980	11/06	put	31	31	0
985	11/06	call	62	71	+9
985	11/06	put	47	60	+13
990	11/06	call	243	257	+14
990	11/06	put	25	59	+34
995	11/06	call	180	173	-7
995	11/06	put	41	42	+1
1,000	11/06	call	190	215	+25
1,000	11/06	put	6	16	+10
1,005	11/06	call	52	78	+26
1,005	11/06	put	6	6	0
1,010	11/06	call	47	52	+5
1,010	11/06	put	1	1	0
1,015	11/06	call	30	31	+1
1,015	11/06	put	2	2	0
1,020	11/06	call	116	117	+1
1,020	11/06	put	8	8	0
1,025	11/06	call	50	53	+3
1,025	11/06	put	4	4	0
1,030	11/06	call	133	138	+5
1,030	11/06	put	4	4	0
1,035	11/06	call	158	158	0
1,040	11/06	call	49	49	0
1,045	11/06	call	82	84	+2
1,050	11/06	call	66	67	+1
1,055	11/06	call	11	11	0
1,060	11/06	call	220	217	-3
1,065	11/06	call	19	19	0
1,070	11/06	call	5	5	0
1,075	11/06	call	5	5	0
1,080	11/06	call	21	21	0
1,085	11/06	call	7	7	0
1,090	11/06	call	25	25	0
1,095	11/06	call	4	4	0

Expiration 2026-11-13

COST open interest, settled 2026-10-21, expiration 2026-11-13, strikes 895 to 1,100

Strike	Expiry	Type	Prior OI	Settled OI	Change
895	11/13	put	50	50	0
900	11/13	call	2	2	0
900	11/13	put	55	55	0
905	11/13	call	4	4	0
905	11/13	put	23	23	0
910	11/13	call	2	2	0
910	11/13	put	19	19	0
915	11/13	call	4	5	+1
915	11/13	put	13	13	0
920	11/13	call	6	6	0
920	11/13	put	52	54	+2
925	11/13	call	80	80	0
925	11/13	put	42	55	+13
930	11/13	call	76	75	-1
930	11/13	put	14	26	+12
935	11/13	call	2	2	0
935	11/13	put	56	55	-1
940	11/13	call	34	34	0
940	11/13	put	168	171	+3
945	11/13	call	14	14	0
945	11/13	put	41	43	+2
950	11/13	call	48	48	0
950	11/13	put	35	37	+2
955	11/13	call	31	31	0
955	11/13	put	51	57	+6
960	11/13	call	49	50	+1
960	11/13	put	51	52	+1
965	11/13	call	63	70	+7
965	11/13	put	47	48	+1
970	11/13	call	57	174	+117
970	11/13	put	26	28	+2
975	11/13	call	34	37	+3
975	11/13	put	11	11	0
980	11/13	call	22	23	+1
980	11/13	put	9	20	+11
985	11/13	call	18	18	0
985	11/13	put	88	88	0
990	11/13	call	31	33	+2
990	11/13	put	23	25	+2
995	11/13	call	7	12	+5
995	11/13	put	88	88	0
1,000	11/13	call	138	137	-1
1,000	11/13	put	6	6	0
1,005	11/13	call	57	53	-4
1,005	11/13	put	41	42	+1
1,010	11/13	call	31	34	+3
1,010	11/13	put	93	94	+1
1,015	11/13	call	42	45	+3
1,015	11/13	put	11	11	0
1,020	11/13	call	46	46	0
1,025	11/13	call	5	5	0
1,025	11/13	put	0	15	+15
1,030	11/13	call	22	25	+3
1,030	11/13	put	2	2	0
1,035	11/13	call	92	91	-1
1,040	11/13	call	65	65	0
1,045	11/13	call	13	13	0
1,050	11/13	call	33	34	+1
1,060	11/13	call	6	6	0
1,070	11/13	call	2	2	0
1,075	11/13	call	2	2	0
1,080	11/13	call	5	5	0
1,085	11/13	call	5	5	0
1,090	11/13	call	1	1	0
1,095	11/13	call	10	10	0
1,100	11/13	call	17	17	0

Expiration 2026-11-20

COST open interest, settled 2026-10-21, expiration 2026-11-20, strikes 865 to 1,120

Strike	Expiry	Type	Prior OI	Settled OI	Change
865	11/20	call	22	22	0
865	11/20	put	111	112	+1
870	11/20	call	16	16	0
870	11/20	put	407	406	-1
875	11/20	call	19	19	0
875	11/20	put	144	142	-2
880	11/20	call	54	54	0
880	11/20	put	597	582	-15
885	11/20	call	39	34	-5
885	11/20	put	221	224	+3
890	11/20	call	48	48	0
890	11/20	put	473	423	-50
895	11/20	call	49	49	0
895	11/20	put	304	304	0
900	11/20	call	221	218	-3
900	11/20	put	780	782	+2
905	11/20	call	53	53	0
905	11/20	put	145	151	+6
910	11/20	call	122	122	0
910	11/20	put	207	210	+3
915	11/20	call	137	132	-5
915	11/20	put	127	131	+4
920	11/20	call	328	328	0
920	11/20	put	1,506	1,505	-1
925	11/20	call	129	128	-1
925	11/20	put	357	372	+15
930	11/20	call	220	220	0
930	11/20	put	1,050	1,038	-12
935	11/20	call	201	197	-4
935	11/20	put	250	260	+10
940	11/20	call	275	273	-2
940	11/20	put	484	477	-7
945	11/20	call	189	190	+1
945	11/20	put	138	164	+26
950	11/20	call	448	446	-2
950	11/20	put	310	312	+2
955	11/20	call	299	298	-1
955	11/20	put	162	165	+3
960	11/20	call	450	444	-6
960	11/20	put	320	307	-13
965	11/20	call	248	250	+2
965	11/20	put	62	67	+5
970	11/20	call	407	411	+4
970	11/20	put	224	224	0
975	11/20	call	215	215	0
975	11/20	put	50	55	+5
980	11/20	call	922	921	-1
980	11/20	put	443	442	-1
985	11/20	call	235	235	0
985	11/20	put	59	62	+3
990	11/20	call	379	379	0
990	11/20	put	21	56	+35
995	11/20	call	458	478	+20
995	11/20	put	94	103	+9
1,000	11/20	call	1,668	1,787	+119
1,000	11/20	put	158	161	+3
1,005	11/20	call	272	273	+1
1,005	11/20	put	69	84	+15
1,010	11/20	call	369	437	+68
1,010	11/20	put	233	234	+1
1,015	11/20	call	27	30	+3
1,015	11/20	put	1	2	+1
1,020	11/20	call	854	856	+2
1,020	11/20	put	124	124	0
1,025	11/20	call	172	178	+6
1,025	11/20	put	1	4	+3
1,030	11/20	call	117	124	+7
1,030	11/20	put	0	10	+10
1,035	11/20	call	49	61	+12
1,035	11/20	put	1	2	+1
1,040	11/20	call	765	824	+59
1,040	11/20	put	17	17	0
1,060	11/20	call	860	866	+6
1,060	11/20	put	11	11	0
1,080	11/20	call	1,002	1,049	+47
1,080	11/20	put	2	2	0
1,100	11/20	call	527	527	0
1,120	11/20	call	424	374	-50
1,120	11/20	put	2	2	0

Expiration 2026-11-27

COST open interest, settled 2026-10-21, expiration 2026-11-27, strikes 900 to 1,100

Strike	Expiry	Type	Prior OI	Settled OI	Change
900	11/27	call	4	4	0
900	11/27	put	28	29	+1
905	11/27	put	8	9	+1
910	11/27	put	37	37	0
915	11/27	put	7	5	-2
920	11/27	call	3	3	0
920	11/27	put	218	220	+2
925	11/27	call	1	1	0
925	11/27	put	24	37	+13
930	11/27	call	5	5	0
930	11/27	put	229	245	+16
935	11/27	call	6	6	0
935	11/27	put	10	9	-1
940	11/27	call	4	4	0
940	11/27	put	13	18	+5
945	11/27	call	9	9	0
945	11/27	put	5	17	+12
950	11/27	call	4	8	+4
950	11/27	put	18	23	+5
955	11/27	call	3	3	0
955	11/27	put	145	148	+3
960	11/27	call	10	10	0
960	11/27	put	25	41	+16
965	11/27	call	5	6	+1
965	11/27	put	9	11	+2
970	11/27	call	32	33	+1
970	11/27	put	18	37	+19
975	11/27	call	7	7	0
975	11/27	put	14	18	+4
980	11/27	call	11	11	0
980	11/27	put	25	37	+12
985	11/27	call	15	15	0
985	11/27	put	15	15	0
990	11/27	call	198	241	+43
990	11/27	put	64	70	+6
995	11/27	call	205	212	+7
995	11/27	put	5	7	+2
1,000	11/27	call	205	219	+14
1,000	11/27	put	26	47	+21
1,005	11/27	call	164	165	+1
1,005	11/27	put	7	27	+20
1,010	11/27	call	18	18	0
1,010	11/27	put	26	27	+1
1,015	11/27	call	5	6	+1
1,020	11/27	call	16	16	0
1,020	11/27	put	41	42	+1
1,025	11/27	call	19	19	0
1,025	11/27	put	0	2	+2
1,030	11/27	call	2	7	+5
1,030	11/27	put	0	3	+3
1,035	11/27	call	5	7	+2
1,040	11/27	call	126	128	+2
1,040	11/27	put	0	1	+1
1,045	11/27	call	10	10	0
1,050	11/27	call	57	60	+3
1,050	11/27	put	0	1	+1
1,055	11/27	call	32	32	0
1,060	11/27	call	12	15	+3
1,070	11/27	call	3	4	+1
1,075	11/27	call	5	6	+1
1,080	11/27	call	23	24	+1
1,085	11/27	call	1	1	0
1,090	11/27	call	6	8	+2
1,095	11/27	call	1	1	0
1,100	11/27	call	6	6	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, 2028-06-16, 2028-09-15, 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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