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Coston, McIsaac & Partners: BRK-B position timeline

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

Coston, McIsaac & Partners held 31,458 BRK-B shares at 2026-06-30 per its 13F-HR filed 2026-08-12.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 31,458 shares
    Change vs previous 13F +783 shares

    3.17% of the 13F portfolio, value $15,740,000.

    13F-HR 0001945037-26-000003 filed by Coston, McIsaac & Partners
    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 30,675 shares
    Change vs previous 13F -235 shares

    3.32% of the 13F portfolio, value $14,699,000.

    13F-HR 0001945037-26-000002 filed by Coston, McIsaac & Partners
    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 30,910 shares
    Change vs previous 13F +672 shares

    3.61% of the 13F portfolio, value $15,536,000.

    13F-HR 0001945037-26-000001 filed by Coston, McIsaac & Partners
    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 30,238 shares
    Change vs previous 13F +35 shares

    3.62% of the 13F portfolio, value $15,201,000.

    13F-HR 0001945037-25-000005 filed by Coston, McIsaac & Partners
    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 30,203 shares
    Change vs previous 13F -241 shares

    3.8% of the 13F portfolio, value $14,670,000.

    13F-HR 0001945037-25-000004 filed by Coston, McIsaac & Partners
    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 30,444 shares
    Change vs previous 13F -518 shares

    4.73% of the 13F portfolio, value $16,212,000.

    13F-HR 0001945037-25-000003 filed by Coston, McIsaac & Partners
    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 30,962 shares
    Change vs previous 13F -846 shares

    4.16% of the 13F portfolio, value $14,033,000.

    13F-HR 0001945037-25-000001 filed by Coston, McIsaac & Partners
    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 31,808 shares
    Change vs previous 13F not available

    4.13% of the 13F portfolio, value $14,639,000.

    13F-HR 0001945037-24-000004 filed by Coston, McIsaac & Partners
    Filed (acceptance time not in the bulk data set), ingested

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