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Contract OI history

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Jan 21, 2028 EXPIRATION

STM $20.00 Put

STM280121P00020000

Latest saved OI245Oct 23, 2026
Last change+15vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
STM $20.00 put open interest history 12 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 2451220 2026-10-02: 215 OI2026-10-05: 215 OI2026-10-06: 215 OI2026-10-07: 215 OI2026-10-08: 215 OI2026-10-09: 215 OI2026-10-13: 230 OI2026-10-14: 230 OI2026-10-15: 230 OI2026-10-16: 230 OI2026-10-21: 230 OI2026-10-23: 245 OI Oct 02, 2026Oct 23, 2026

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

STM contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing245+15
Oct 21, 20262300
Oct 16, 20262300
Oct 15, 20262300
Oct 14, 20262300
Oct 13, 2026230+15
Oct 09, 20262150
Oct 08, 20262150
Oct 07, 20262150
Oct 06, 20262150
Oct 05, 20262150
Oct 02, 2026215No prior observation