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Disclosery

Main Street Research LLC: BRK-B position timeline

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

Main Street Research LLC held 11,980 BRK-B shares at 2026-06-30 per its 13F-HR filed 2026-07-29.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 11,980 shares
    Change vs previous 13F +2 shares

    0.28% of the 13F portfolio, value $5,994,672.

    13F-HR 0001420506-26-001335 filed by Main Street Research 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 11,978 shares
    Change vs previous 13F -138 shares

    0.33% of the 13F portfolio, value $5,739,858.

    13F-HR 0001420506-26-000773 filed by Main Street Research 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 12,116 shares
    Change vs previous 13F -1,145 shares

    0.35% of the 13F portfolio, value $6,090,107.

    13F-HR 0001420506-26-000210 filed by Main Street Research 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 13,261 shares
    Change vs previous 13F -102,920 shares

    0.36% of the 13F portfolio, value $6,666,835.

    13F-HR 0001420506-25-003188 filed by Main Street Research 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 116,181 shares
    Change vs previous 13F +4,761 shares

    3.51% of the 13F portfolio, value $56,437,244.

    13F-HR 0001420506-25-001710 filed by Main Street Research 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 111,420 shares
    Change vs previous 13F +1,986 shares

    3.88% of the 13F portfolio, value $59,340,064.

    13F-HR 0001420506-25-000840 filed by Main Street Research 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 109,434 shares
    Change vs previous 13F +1,448 shares

    3.09% of the 13F portfolio, value $49,604,244.

    13F-HR 0001420506-25-000201 filed by Main Street Research 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 107,986 shares
    Change vs previous 13F not available

    3.13% of the 13F portfolio, value $49,701,636.

    13F-HR 0001941040-24-000499 filed by Main Street Research LLC
    Filed (acceptance time not in the bulk data set), ingested

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