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Contract OI history

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Dec 18, 2026 EXPIRATION

TREX $40.00 Put

TREX261218P00040000

Latest saved OI396Oct 23, 2026
Last change+2vs previous saved observation
Saved market days11Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
TREX $40.00 put open interest history 11 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 3961980 2026-10-02: 387 OI2026-10-05: 394 OI2026-10-06: 394 OI2026-10-07: 394 OI2026-10-08: 394 OI2026-10-09: 394 OI2026-10-14: 394 OI2026-10-15: 394 OI2026-10-16: 394 OI2026-10-21: 394 OI2026-10-23: 396 OI Oct 02, 2026Oct 23, 2026

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

TREX contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026396+2
Oct 21, 2026Viewing3940
Oct 16, 20263940
Oct 15, 20263940
Oct 14, 20263940
Oct 09, 20263940
Oct 08, 20263940
Oct 07, 20263940
Oct 06, 20263940
Oct 05, 2026394+7
Oct 02, 2026387No prior observation