MCO Options Open Interest by Strike, Oct 21 Settlement

MCO 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 5 nearest of 5 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, 236 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 5 nearest expirations, strikes from 385 to 577. Source: SquawkFlow's archive of settled open interest. Counts are contracts, not trades; they do not identify which side opened or closed a position.

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

Strike	Expiry	Type	Prior OI	Settled OI	Change
460	11/20	put	36	250	+214
470	11/20	put	74	220	+146
680	11/20	call	5	131	+126
440	11/20	put	140	184	+44
510	01/15	put	10	46	+36
490	11/20	call	1,116	1,151	+35
450	11/20	put	671	700	+29
550	11/20	call	227	256	+29
540	11/20	call	51	79	+28
350	11/20	put	19	45	+26
410	11/20	put	106	131	+25
400	11/20	put	172	194	+22
570	11/20	call	18	40	+22
420	11/20	put	97	117	+20
480	11/20	put	63	81	+18

Expiration 2026-11-20

MCO open interest, settled 2026-10-21, expiration 2026-11-20, strikes 290 to 680

Strike	Expiry	Type	Prior OI	Settled OI	Change
290	11/20	put	1	1	0
300	11/20	call	2	2	0
300	11/20	put	41	41	0
310	11/20	call	1	1	0
310	11/20	put	6	6	0
320	11/20	put	6	6	0
330	11/20	put	10	10	0
340	11/20	put	23	23	0
350	11/20	put	19	45	+26
360	11/20	put	55	57	+2
370	11/20	call	3	3	0
370	11/20	put	84	84	0
380	11/20	call	4	4	0
380	11/20	put	13	13	0
390	11/20	call	2	2	0
390	11/20	put	27	29	+2
400	11/20	put	172	194	+22
410	11/20	put	106	131	+25
420	11/20	call	1	1	0
420	11/20	put	97	117	+20
430	11/20	put	110	122	+12
440	11/20	call	12	12	0
440	11/20	put	140	184	+44
450	11/20	call	36	36	0
450	11/20	put	671	700	+29
460	11/20	call	76	76	0
460	11/20	put	36	250	+214
470	11/20	call	65	57	-8
470	11/20	put	74	220	+146
480	11/20	call	51	54	+3
480	11/20	put	63	81	+18
490	11/20	call	1,116	1,151	+35
490	11/20	put	70	70	0
500	11/20	call	147	159	+12
500	11/20	put	10	10	0
510	11/20	call	1,136	1,140	+4
510	11/20	put	4	4	0
520	11/20	call	108	108	0
520	11/20	put	2	2	0
530	11/20	call	106	107	+1
540	11/20	call	51	79	+28
550	11/20	call	227	256	+29
560	11/20	call	24	24	0
570	11/20	call	18	40	+22
580	11/20	call	27	28	+1
590	11/20	call	7	7	0
600	11/20	call	4	6	+2
610	11/20	call	35	35	0
620	11/20	call	22	22	0
630	11/20	call	1	1	0
640	11/20	call	115	115	0
650	11/20	call	4	4	0
660	11/20	call	6	6	0
670	11/20	call	3	3	0
680	11/20	call	5	131	+126

Expiration 2026-12-18

MCO open interest, settled 2026-10-21, expiration 2026-12-18, strikes 350 to 590

Strike	Expiry	Type	Prior OI	Settled OI	Change
350	12/18	put	1	1	0
400	12/18	put	2	2	0
410	12/18	put	1	1	0
420	12/18	put	2	18	+16
430	12/18	put	0	14	+14
440	12/18	put	2	2	0
450	12/18	put	0	2	+2
460	12/18	put	7	7	0
470	12/18	put	1	1	0
480	12/18	call	0	4	+4
480	12/18	put	2	4	+2
490	12/18	call	2	13	+11
490	12/18	put	2	2	0
500	12/18	call	1	2	+1
510	12/18	call	3	20	+17
520	12/18	call	2	2	0
530	12/18	call	7	21	+14
540	12/18	call	0	12	+12
570	12/18	call	2	2	0
590	12/18	call	4	4	0

Expiration 2027-01-15

MCO open interest, settled 2026-10-21, expiration 2027-01-15, strikes 290 to 680

Strike	Expiry	Type	Prior OI	Settled OI	Change
290	01/15	put	15	15	0
300	01/15	call	150	150	0
300	01/15	put	14	14	0
310	01/15	put	10	10	0
320	01/15	call	1	1	0
320	01/15	put	9	9	0
330	01/15	put	14	14	0
340	01/15	call	1	1	0
340	01/15	put	8	8	0
350	01/15	call	4	4	0
350	01/15	put	52	52	0
360	01/15	put	16	16	0
370	01/15	put	10	10	0
380	01/15	call	9	9	0
380	01/15	put	13	13	0
390	01/15	call	3	3	0
390	01/15	put	15	15	0
400	01/15	call	3	3	0
400	01/15	put	125	121	-4
410	01/15	put	22	22	0
420	01/15	call	2	2	0
420	01/15	put	24	23	-1
430	01/15	call	27	27	0
430	01/15	put	23	25	+2
440	01/15	call	5	5	0
440	01/15	put	88	88	0
450	01/15	call	27	27	0
450	01/15	put	169	170	+1
460	01/15	call	176	176	0
460	01/15	put	42	42	0
470	01/15	call	11	11	0
470	01/15	put	40	40	0
480	01/15	call	99	97	-2
480	01/15	put	82	82	0
490	01/15	call	60	60	0
490	01/15	put	61	61	0
500	01/15	call	62	62	0
500	01/15	put	14	14	0
510	01/15	call	69	69	0
510	01/15	put	10	46	+36
520	01/15	call	66	67	+1
530	01/15	call	37	37	0
530	01/15	put	2	2	0
540	01/15	call	48	48	0
550	01/15	call	49	49	0
550	01/15	put	1	1	0
560	01/15	call	37	37	0
570	01/15	call	17	17	0
580	01/15	call	29	29	0
590	01/15	call	7	7	0
600	01/15	call	21	21	0
610	01/15	call	1	1	0
620	01/15	call	1	1	0
630	01/15	call	2	2	0
640	01/15	call	1	1	0
650	01/15	call	2	2	0
660	01/15	call	6	6	0
670	01/15	call	2	2	0
680	01/15	call	8	8	0

Expiration 2027-02-19

MCO open interest, settled 2026-10-21, expiration 2027-02-19, strikes 260 to 740

Strike	Expiry	Type	Prior OI	Settled OI
260	02/19	put	4	4
270	02/19	put	2	2
290	02/19	put	5	5
300	02/19	put	5	5
310	02/19	put	7	7
320	02/19	put	5	5
330	02/19	put	6	6
340	02/19	call	1	1
340	02/19	put	7	7
350	02/19	put	3	3
370	02/19	put	1	1
380	02/19	put	2	2
390	02/19	put	74	74
400	02/19	call	2	2
400	02/19	put	15	15
410	02/19	call	3	3
410	02/19	put	22	22
420	02/19	call	5	5
420	02/19	put	27	27
430	02/19	call	9	9
430	02/19	put	99	99
440	02/19	put	22	22
450	02/19	call	2	2
450	02/19	put	25	25
460	02/19	call	1	1
460	02/19	put	38	38
470	02/19	call	19	19
470	02/19	put	3	3
480	02/19	call	13	13
480	02/19	put	25	25
490	02/19	call	3	3
490	02/19	put	8	8
500	02/19	call	50	50
500	02/19	put	6	6
510	02/19	call	38	38
520	02/19	call	90	90
520	02/19	put	11	11
530	02/19	call	58	58
540	02/19	call	16	16
550	02/19	call	24	24
560	02/19	call	151	151
570	02/19	call	349	349
580	02/19	call	1	1
590	02/19	call	1	1
600	02/19	call	2	2
610	02/19	call	9	9
640	02/19	call	3	3
660	02/19	call	2	2
680	02/19	call	3	3
700	02/19	call	2	2
720	02/19	call	1	1
740	02/19	call	1	1

Expiration 2027-05-21

MCO open interest, settled 2026-10-21, expiration 2027-05-21, strikes 270 to 660

Strike	Expiry	Type	Prior OI	Settled OI	Change
270	05/21	put	1	1	0
330	05/21	put	13	13	0
340	05/21	put	16	16	0
350	05/21	call	1	1	0
350	05/21	put	15	15	0
360	05/21	put	5	5	0
370	05/21	put	1	1	0
380	05/21	put	2	2	0
390	05/21	put	8	8	0
400	05/21	call	1	1	0
400	05/21	put	363	363	0
410	05/21	call	1	1	0
410	05/21	put	4	4	0
420	05/21	call	4	4	0
430	05/21	call	6	6	0
430	05/21	put	2	12	+10
440	05/21	call	21	20	-1
440	05/21	put	1	1	0
450	05/21	call	12	12	0
450	05/21	put	2	2	0
460	05/21	call	10	10	0
460	05/21	put	1	1	0
470	05/21	put	2	2	0
480	05/21	put	1	1	0
500	05/21	put	1	1	0
510	05/21	call	2	2	0
530	05/21	call	1	1	0
550	05/21	call	3	3	0
570	05/21	call	7	7	0
590	05/21	call	14	14	0
600	05/21	call	1	1	0
610	05/21	call	1	1	0
620	05/21	call	1	1	0
640	05/21	call	2	2	0
660	05/21	call	5	5	0

Markdown table | Open interest changes across symbols

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