Skip to content
Disclosery

Main Street Research LLC: TSM position timeline

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

Main Street Research LLC held 228,429 TSM 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 228,429 shares
    Change vs previous 13F +5,270 shares

    5.15% of the 13F portfolio, value $109,090,838.

    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 223,159 shares
    Change vs previous 13F +5,012 shares

    4.39% of the 13F portfolio, value $75,416,584.

    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 218,147 shares
    Change vs previous 13F -2,724 shares

    3.8% of the 13F portfolio, value $66,466,466.

    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 220,871 shares
    Change vs previous 13F +83,894 shares

    3.33% of the 13F portfolio, value $61,687,062.

    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 136,977 shares
    Change vs previous 13F -38,029 shares

    1.94% of the 13F portfolio, value $31,130,359.

    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 175,006 shares
    Change vs previous 13F +2,239 shares

    1.91% of the 13F portfolio, value $29,169,405.

    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 172,767 shares
    Change vs previous 13F +3,773 shares

    2.13% of the 13F portfolio, value $34,224,726.

    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 168,994 shares
    Change vs previous 13F not available

    1.85% of the 13F portfolio, value $29,454,821.

    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).