OITracker Cboe delayed data

Contract OI history

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Jan 21, 2028 EXPIRATION

BFLY $17.50 Call

BFLY280121C00017500

Latest saved OI1,753Oct 23, 2026
Last change0vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
BFLY $17.50 call open interest history 12 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 1,7538760 2026-10-02: 1,569 OI2026-10-05: 1,569 OI2026-10-06: 1,569 OI2026-10-07: 1,551 OI2026-10-08: 1,551 OI2026-10-09: 1,551 OI2026-10-13: 1,551 OI2026-10-14: 1,551 OI2026-10-15: 1,551 OI2026-10-16: 1,751 OI2026-10-21: 1,753 OI2026-10-23: 1,753 OI Oct 02, 2026Oct 23, 2026

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

BFLY contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing1,7530
Oct 21, 20261,753+2
Oct 16, 20261,751+200
Oct 15, 20261,5510
Oct 14, 20261,5510
Oct 13, 20261,5510
Oct 09, 20261,5510
Oct 08, 20261,5510
Oct 07, 20261,551-18
Oct 06, 20261,5690
Oct 05, 20261,5690
Oct 02, 20261,569No prior observation