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Birnam Oak Advisors, LP: BRK-B position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Birnam Oak Advisors, LP on BRK-B, newest first. How the timeline and the estimate are built.

Birnam Oak Advisors, LP held 15,000 BRK-B shares at 2026-06-30 per its 13F-HR filed 2026-08-14.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 15,000 shares
    Change vs previous 13F +1,000 shares

    1.23% of the 13F portfolio, value $7,505,850.

    13F-HR 0001172661-26-003467 filed by Birnam Oak Advisors, LP
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  2. period ended2026-03-31
    13F 14,000 shares
    Change vs previous 13F -2,000 shares

    1.85% of the 13F portfolio, value $6,708,800.

    13F-HR 0001172661-26-001696 filed by Birnam Oak Advisors, LP
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  3. period ended2025-12-31
    13F 16,000 shares
    Change vs previous 13F 0 shares

    1.8% of the 13F portfolio, value $8,042,400.

    13F-HR 0001172661-26-001061 filed by Birnam Oak Advisors, LP
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  4. period ended2025-09-30
    13F 16,000 shares
    Change vs previous 13F +1,000 shares

    1.97% of the 13F portfolio, value $8,043,840.

    13F-HR 0001172661-25-004845 filed by Birnam Oak Advisors, LP
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  5. period ended2025-06-30
    13F 15,000 shares
    Change vs previous 13F 0 shares

    2.18% of the 13F portfolio, value $7,286,550.

    13F-HR 0001172661-25-003004 filed by Birnam Oak Advisors, LP
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  6. period ended2025-03-31
    13F 15,000 shares
    Change vs previous 13F 0 shares

    3.34% of the 13F portfolio, value $7,988,700.

    13F-HR 0001172661-25-001810 filed by Birnam Oak Advisors, LP
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).

  7. period ended2024-12-31
    13F 15,000 shares
    Change vs previous 13F not available

    3.35% of the 13F portfolio, value $6,799,200.

    13F-HR 0001172661-25-000630 filed by Birnam Oak Advisors, LP
    Filed (acceptance time not in the bulk data set), ingested

    Acceptance time not in the bulk data set (spec §4.2).