OITracker Cboe delayed data

Contract OI history

Back to TOST

May 21, 2027 EXPIRATION

TOST $28.00 Put

TOST270521P00028000

Latest saved OI3,566Oct 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 $28.00 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. 3,5681,7840 2026-10-02: 38 OI2026-10-05: 2 OI2026-10-06: 2 OI2026-10-07: 3,525 OI2026-10-08: 3,525 OI2026-10-09: 3,525 OI2026-10-13: 3,525 OI2026-10-14: 3,525 OI2026-10-15: 3,568 OI2026-10-16: 3,566 OI2026-10-21: 3,566 OI2026-10-23: 3,566 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, 2026Viewing3,5660
Oct 21, 20263,5660
Oct 16, 20263,566-2
Oct 15, 20263,568+43
Oct 14, 20263,5250
Oct 13, 20263,5250
Oct 09, 20263,5250
Oct 08, 20263,5250
Oct 07, 20263,525+3,523
Oct 06, 202620
Oct 05, 20262-36
Oct 02, 202638No prior observation