OITracker Cboe delayed data

Contract OI history

Back to TOST

Jan 21, 2028 EXPIRATION

TOST $40.00 Put

TOST280121P00040000

Latest saved OI343Oct 23, 2026
Last change0vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
TOST $40.00 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. 3431710 2026-10-02: 245 OI2026-10-05: 245 OI2026-10-06: 245 OI2026-10-07: 245 OI2026-10-08: 245 OI2026-10-09: 245 OI2026-10-13: 245 OI2026-10-14: 245 OI2026-10-15: 343 OI2026-10-16: 343 OI2026-10-21: 343 OI2026-10-23: 343 OI Oct 02, 2026Oct 23, 2026

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

TOST contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 20263430
Oct 21, 2026Viewing3430
Oct 16, 20263430
Oct 15, 2026343+98
Oct 14, 20262450
Oct 13, 20262450
Oct 09, 20262450
Oct 08, 20262450
Oct 07, 20262450
Oct 06, 20262450
Oct 05, 20262450
Oct 02, 2026245No prior observation