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Rockingstone Advisors LLC: BRK-B position timeline

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

Rockingstone Advisors LLC held 7,295 BRK-B shares at 2026-06-30 per its 13F-HR filed 2026-07-14.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 7,295 shares
    Change vs previous 13F +248 shares

    1.47% of the 13F portfolio, value $3,650,345.

    13F-HR 0002027176-26-000003 filed by Rockingstone Advisors LLC
    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 7,047 shares
    Change vs previous 13F +23 shares

    1.55% of the 13F portfolio, value $3,376,922.

    13F-HR 0002027176-26-000002 filed by Rockingstone Advisors LLC
    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 7,024 shares
    Change vs previous 13F +361 shares

    1.61% of the 13F portfolio, value $3,530,614.

    13F-HR 0002027176-26-000001 filed by Rockingstone Advisors LLC
    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 6,663 shares
    Change vs previous 13F +37 shares

    1.65% of the 13F portfolio, value $3,349,757.

    13F-HR 0002027176-25-000007 filed by Rockingstone Advisors LLC
    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 6,626 shares
    Change vs previous 13F -2,613 shares

    1.69% of the 13F portfolio, value $3,218,712.

    13F-HR 0002027176-25-000004 filed by Rockingstone Advisors LLC
    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 9,239 shares
    Change vs previous 13F +160 shares

    2.21% of the 13F portfolio, value $4,920,507.

    13F-HR 0002027176-25-000003 filed by Rockingstone Advisors LLC
    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 9,079 shares
    Change vs previous 13F -937 shares

    1.82% of the 13F portfolio, value $4,115,329.

    13F-HR 0002027176-25-000001 filed by Rockingstone Advisors LLC
    Filed (acceptance time not in the bulk data set), ingested

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

  8. period ended2024-09-30
    13F 10,016 shares
    Change vs previous 13F not available

    2.26% of the 13F portfolio, value $4,609,964.

    13F-HR 0002027176-24-000009 filed by Rockingstone Advisors LLC
    Filed (acceptance time not in the bulk data set), ingested

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