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Disclosery

HARBOR ADVISORY CORP /MA/: BRK-B position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of HARBOR ADVISORY CORP /MA/ on BRK-B, newest first. How the timeline and the estimate are built.

HARBOR ADVISORY CORP /MA/ held 28,270 BRK-B shares at 2026-06-30 per its 13F-HR filed 2026-08-13.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 28,270 shares
    Change vs previous 13F +6,173 shares

    3.79% of the 13F portfolio, value $14,146,025.

    13F-HR 0001765380-26-000383 filed by HARBOR ADVISORY CORP /MA/
    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 22,097 shares
    Change vs previous 13F -1,680 shares

    3.18% of the 13F portfolio, value $10,588,882.

    13F-HR 0001765380-26-000184 filed by HARBOR ADVISORY CORP /MA/
    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 23,777 shares
    Change vs previous 13F -1,081 shares

    3.62% of the 13F portfolio, value $11,951,509.

    13F-HR 0001765380-26-000072 filed by HARBOR ADVISORY CORP /MA/
    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 24,858 shares
    Change vs previous 13F -294 shares

    3.7% of the 13F portfolio, value $12,497,111.

    13F-HR 0001765380-25-000479 filed by HARBOR ADVISORY CORP /MA/
    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 25,152 shares
    Change vs previous 13F -250 shares

    3.89% of the 13F portfolio, value $12,218,087.

    13F-HR 0001765380-25-000360 filed by HARBOR ADVISORY CORP /MA/
    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 25,402 shares
    Change vs previous 13F -190 shares

    4.54% of the 13F portfolio, value $13,528,597.

    13F-HR 0001765380-25-000220 filed by HARBOR ADVISORY CORP /MA/
    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 25,592 shares
    Change vs previous 13F -319 shares

    3.81% of the 13F portfolio, value $11,600,342.

    13F-HR 0001100710-25-000001 filed by HARBOR ADVISORY CORP /MA/
    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 25,911 shares
    Change vs previous 13F not available

    3.89% of the 13F portfolio, value $11,925,797.

    13F-HR 0001100710-24-000004 filed by HARBOR ADVISORY CORP /MA/
    Filed (acceptance time not in the bulk data set), ingested

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