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Contract OI history

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Nov 20, 2026 EXPIRATION

CSTM $20.00 Put

CSTM261120P00020000

Latest saved OI348Oct 23, 2026
Last change+10vs previous saved observation
Saved market days10Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
CSTM $20.00 put open interest history 10 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 3481740 2026-10-02: 331 OI2026-10-05: 333 OI2026-10-06: 336 OI2026-10-07: 333 OI2026-10-08: 333 OI2026-10-13: 338 OI2026-10-14: 338 OI2026-10-16: 338 OI2026-10-20: 338 OI2026-10-23: 348 OI Oct 02, 2026Oct 23, 2026

All saved dates are shown. Changes compare consecutive saved observations. Missing observations are not filled with zero.

CSTM contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing348+10
Oct 20, 20263380
Oct 16, 20263380
Oct 14, 20263380
Oct 13, 2026338+5
Oct 08, 20263330
Oct 07, 2026333-3
Oct 06, 2026336+3
Oct 05, 2026333+2
Oct 02, 2026331No prior observation