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Tweedy, Browne Co LLC: IONS position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Tweedy, Browne Co LLC on IONS, newest first. How the timeline and the estimate are built.

Tweedy, Browne Co LLC held 2,280,311 IONS shares at 2026-06-30 per its 13F-HR filed 2026-08-07.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 2,280,311 shares
    Change vs previous 13F +4,686 shares

    13.7% of the 13F portfolio, value $180,805,859.

    13F-HR 0001193125-26-340443 filed by Tweedy, Browne Co 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 2,275,625 shares
    Change vs previous 13F -189,305 shares

    13.57% of the 13F portfolio, value $170,876,681.

    13F-HR 0001193125-26-208439 filed by Tweedy, Browne Co 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 2,464,930 shares
    Change vs previous 13F -436,286 shares

    15.74% of the 13F portfolio, value $195,000,612.

    13F-HR 0001193125-26-033986 filed by Tweedy, Browne Co 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 2,901,216 shares
    Change vs previous 13F +9,268 shares

    16.48% of the 13F portfolio, value $189,797,551.

    13F-HR 0001193125-25-288943 filed by Tweedy, Browne Co 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 2,891,948 shares
    Change vs previous 13F -91,570 shares

    10.6% of the 13F portfolio, value $114,260,865.

    13F-HR 0000950123-25-006713 filed by Tweedy, Browne Co 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 2,983,518 shares
    Change vs previous 13F -265,345 shares

    7.98% of the 13F portfolio, value $90,012,738.

    13F-HR 0000950123-25-005518 filed by Tweedy, Browne Co 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 3,248,863 shares
    Change vs previous 13F -205,813 shares

    7.66% of the 13F portfolio, value $113,580,250.

    13F-HR 0000950123-25-001787 filed by Tweedy, Browne Co 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 3,454,676 shares
    Change vs previous 13F not available

    6.6% of the 13F portfolio, value $138,394,321.

    13F-HR 0000950123-24-011077 filed by Tweedy, Browne Co LLC
    Filed (acceptance time not in the bulk data set), ingested

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