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T. Rowe Price Investment Management, Inc.: IONS position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of T. Rowe Price Investment Management, Inc. on IONS, newest first. How the timeline and the estimate are built.

T. Rowe Price Investment Management, Inc. held 3,959,372 IONS 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 3,959,372 shares
    Change vs previous 13F -2,199,655 shares

    0.21% of the 13F portfolio, value $313,939,000.

    13F-HR 0001897612-26-000578 filed by T. Rowe Price Investment Management, 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 6,159,027 shares
    Change vs previous 13F -2,948,992 shares

    0.32% of the 13F portfolio, value $462,482,000.

    13F-HR 0001897612-26-000460 filed by T. Rowe Price Investment Management, 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/A 9,108,019 shares
    Change vs previous 13F -4,048,910 shares

    0.45% of the 13F portfolio, value $720,536,000.

    13F-HR/A 0001897612-26-000299 filed by T. Rowe Price Investment Management, 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 13,156,929 shares
    Change vs previous 13F -2,891,792 shares

    0.53% of the 13F portfolio, value $860,727,000.

    13F-HR 0001897612-25-000511 filed by T. Rowe Price Investment Management, 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 16,048,721 shares
    Change vs previous 13F -126,812 shares

    0.4% of the 13F portfolio, value $634,085,000.

    13F-HR 0000080255-25-000548 filed by T. Rowe Price Investment Management, 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 16,175,533 shares
    Change vs previous 13F +2,006,334 shares

    0.32% of the 13F portfolio, value $488,016,000.

    13F-HR 0000080255-25-000283 filed by T. Rowe Price Investment Management, 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 14,169,199 shares
    Change vs previous 13F +1,083 shares

    0.31% of the 13F portfolio, value $495,356,000.

    13F-HR 0000080255-25-000217 filed by T. Rowe Price Investment Management, 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 14,168,116 shares
    Change vs previous 13F not available

    0.34% of the 13F portfolio, value $567,575,000.

    13F-HR 0001897612-24-002015 filed by T. Rowe Price Investment Management, Inc.
    Filed (acceptance time not in the bulk data set), ingested

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