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Disclosery

RWWM, INC.: BRK-B position timeline

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

RWWM, INC. held 255,944 BRK-B shares at 2026-06-30 per its 13F-HR filed 2026-08-14.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 255,944 shares
    Change vs previous 13F +12,351 shares

    9.46% of the 13F portfolio, value $128,071,818.

    13F-HR 0001507683-26-000020 filed by RWWM, INC.
    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 243,593 shares
    Change vs previous 13F +1,625 shares

    8.52% of the 13F portfolio, value $116,729,766.

    13F-HR 0001507683-26-000011 filed by RWWM, INC.
    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 241,968 shares
    Change vs previous 13F -2,288 shares

    8.36% of the 13F portfolio, value $121,625,215.

    13F-HR 0001507683-26-000004 filed by RWWM, INC.
    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 244,256 shares
    Change vs previous 13F +273 shares

    8.77% of the 13F portfolio, value $122,797,261.

    13F-HR 0001507683-25-000003 filed by RWWM, INC.
    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 243,983 shares
    Change vs previous 13F -3,764 shares

    9.79% of the 13F portfolio, value $118,519,622.

    13F-HR 0001085146-25-004481 filed by RWWM, INC.
    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 247,747 shares
    Change vs previous 13F -4,226 shares

    10.62% of the 13F portfolio, value $131,945,097.

    13F-HR 0001085146-25-002156 filed by RWWM, INC.
    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 251,973 shares
    Change vs previous 13F -262 shares

    10.43% of the 13F portfolio, value $114,214,321.

    13F-HR 0001085146-25-001258 filed by RWWM, INC.
    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 252,235 shares
    Change vs previous 13F not available

    10.73% of the 13F portfolio, value $116,093,681.

    13F-HR 0001085146-24-005568 filed by RWWM, INC.
    Filed (acceptance time not in the bulk data set), ingested

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