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Avidity Partners Management LP: BSX position timeline

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

Avidity Partners Management LP held 80,000 BSX 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 80,000 shares
    Change vs previous 13F +20,000 shares

    0.55% of the 13F portfolio, value $3,414,400.

    13F-HR 0001791827-26-000005 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).

  2. period ended2026-03-31
    13F/A 60,000 shares
    Change vs previous 13F -54,500 shares

    0.76% of the 13F portfolio, value $3,765,000.

    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).

  3. period ended2025-12-31
    13F 114,500 shares
    Change vs previous 13F -49,800 shares

    3.15% of the 13F portfolio, value $10,917,575.

    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).

  4. period ended2025-09-30
    13F 164,300 shares
    Change vs previous 13F -157,500 shares

    3.65% of the 13F portfolio, value $16,040,609.

    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).

  5. period ended2025-06-30
    13F 321,800 shares
    Change vs previous 13F -14,200 shares

    6.93% of the 13F portfolio, value $34,564,538.

    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).

  6. period ended2025-03-31
    13F 336,000 shares
    Change vs previous 13F -179,000 shares

    6.99% of the 13F portfolio, value $33,895,680.

    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).

  7. period ended2024-12-31
    13F 515,000 shares
    Change vs previous 13F -447,000 shares

    4.59% of the 13F portfolio, value $45,999,800.

    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).

  8. period ended2024-09-30
    13F 962,000 shares
    Change vs previous 13F not available

    4.11% of the 13F portfolio, value $80,615,600.

    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).