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Contract OI history

Back to BRK.B

Dec 18, 2026 EXPIRATION

BRK.B $420.00 Put

BRKB261218P00420000

Latest saved OI543Oct 23, 2026
Last change-20vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
BRK.B $420.00 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. 5712850 2026-10-02: 559 OI2026-10-05: 560 OI2026-10-06: 560 OI2026-10-07: 560 OI2026-10-08: 560 OI2026-10-09: 560 OI2026-10-13: 570 OI2026-10-14: 570 OI2026-10-15: 571 OI2026-10-16: 567 OI2026-10-21: 563 OI2026-10-23: 543 OI Oct 02, 2026Oct 23, 2026

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

BRK.B contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 2026Viewing543-20
Oct 21, 2026563-4
Oct 16, 2026567-4
Oct 15, 2026571+1
Oct 14, 20265700
Oct 13, 2026570+10
Oct 09, 20265600
Oct 08, 20265600
Oct 07, 20265600
Oct 06, 20265600
Oct 05, 2026560+1
Oct 02, 2026559No prior observation