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Disclosery

Main Street Research LLC: COST position timeline

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

Main Street Research LLC held 47,497 COST 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 47,497 shares
    Change vs previous 13F +1,358 shares

    2.1% of the 13F portfolio, value $44,432,468.

    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 46,139 shares
    Change vs previous 13F -16,227 shares

    2.68% of the 13F portfolio, value $45,974,280.

    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 62,366 shares
    Change vs previous 13F -1,093 shares

    3.08% of the 13F portfolio, value $53,780,457.

    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 63,459 shares
    Change vs previous 13F +610 shares

    3.17% of the 13F portfolio, value $58,739,461.

    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 62,849 shares
    Change vs previous 13F +894 shares

    3.87% of the 13F portfolio, value $62,216,356.

    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 61,955 shares
    Change vs previous 13F +663 shares

    3.83% of the 13F portfolio, value $58,595,663.

    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 61,292 shares
    Change vs previous 13F +2,472 shares

    3.5% of the 13F portfolio, value $56,160,095.

    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 58,820 shares
    Change vs previous 13F not available

    3.28% of the 13F portfolio, value $52,145,317.

    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).