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Disclosery

Mainstream Capital Management LLC: BRK-B position timeline

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

Mainstream Capital Management LLC held 5,400 BRK-B shares at 2026-06-30 per its 13F-HR filed 2026-07-15.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 5,400 shares
    Change vs previous 13F +4 shares

    1.63% of the 13F portfolio, value $2,702,106.

    13F-HR 0002043084-26-000003 filed by Mainstream Capital Management 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 5,396 shares
    Change vs previous 13F +6 shares

    1.73% of the 13F portfolio, value $2,585,763.

    13F-HR 0002043084-26-000002 filed by Mainstream Capital Management 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 5,390 shares
    Change vs previous 13F -87 shares

    1.77% of the 13F portfolio, value $2,709,284.

    13F-HR 0002043084-26-000001 filed by Mainstream Capital Management 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 5,477 shares
    Change vs previous 13F +181 shares

    1.83% of the 13F portfolio, value $2,753,507.

    13F-HR 0002043084-25-000006 filed by Mainstream Capital Management 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 5,296 shares
    Change vs previous 13F -93 shares

    1.87% of the 13F portfolio, value $2,572,638.

    13F-HR 0002043084-25-000004 filed by Mainstream Capital Management 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 5,389 shares
    Change vs previous 13F +143 shares

    2.27% of the 13F portfolio, value $2,870,074.

    13F-HR 0002043084-25-000002 filed by Mainstream Capital Management 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 5,246 shares
    Change vs previous 13F +65 shares

    1.67% of the 13F portfolio, value $2,377,907.

    13F-HR 0002043084-25-000001 filed by Mainstream Capital Management 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 5,181 shares
    Change vs previous 13F not available

    2.03% of the 13F portfolio, value $2,384,607.

    13F-HR 0002043084-24-000002 filed by Mainstream Capital Management LLC
    Filed (acceptance time not in the bulk data set), ingested

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