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Disclosery

Avidity Partners Management LP: INSM position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Avidity Partners Management LP on INSM, newest first. How the timeline and the estimate are built.

Avidity Partners Management LP held 0 INSM shares at 2026-03-31 per its 13F-HR/A filed 2026-05-28.

the latest 13F is the newest step

  1. period ended2026-03-31
    13F/A 0 shares
    Change vs previous 13F -17,700 shares

    13F-HR/A 0001791827-26-000004 filed by Avidity Partners Management LP
    Filed (acceptance time not in the bulk data set), ingested

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

    Exited: the 13F for this period no longer lists the position.

  2. period ended2025-12-31
    13F 17,700 shares
    Change vs previous 13F +6,100 shares

    0.89% of the 13F portfolio, value $3,080,508.

    13F-HR 0001791827-26-000002 filed by Avidity Partners Management LP
    Filed (acceptance time not in the bulk data set), ingested

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

  3. period ended2025-09-30
    13F 11,600 shares
    Change vs previous 13F -47,400 shares

    0.38% of the 13F portfolio, value $1,670,516.

    13F-HR 0001791827-25-000008 filed by Avidity Partners Management LP
    Filed (acceptance time not in the bulk data set), ingested

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

  4. period ended2025-06-30
    13F 59,000 shares
    Change vs previous 13F -48,000 shares

    1.19% of the 13F portfolio, value $5,937,760.

    13F-HR 0001791827-25-000007 filed by Avidity Partners Management LP
    Filed (acceptance time not in the bulk data set), ingested

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

  5. period ended2025-03-31
    13F 107,000 shares
    Change vs previous 13F -125,800 shares

    1.68% of the 13F portfolio, value $8,163,030.

    13F-HR 0001791827-25-000005 filed by Avidity Partners Management LP
    Filed (acceptance time not in the bulk data set), ingested

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

  6. period ended2024-12-31
    13F 232,800 shares
    Change vs previous 13F -359,200 shares

    1.6% of the 13F portfolio, value $16,072,512.

    13F-HR 0001791827-25-000002 filed by Avidity Partners Management LP
    Filed (acceptance time not in the bulk data set), ingested

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

  7. period ended2024-09-30
    13F 592,000 shares
    Change vs previous 13F not available

    2.2% of the 13F portfolio, value $43,216,000.

    13F-HR 0001791827-24-000011 filed by Avidity Partners Management LP
    Filed (acceptance time not in the bulk data set), ingested

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