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Atlas Venture Life Science Advisors, LLC: IRON position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Atlas Venture Life Science Advisors, LLC on IRON, newest first. How the timeline and the estimate are built.

Atlas Venture Life Science Advisors, LLC held 1,513,875 IRON shares at 2026-06-30 per its 13F-HR filed 2026-08-13.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 1,513,875 shares
    Change vs previous 13F 0 shares

    12.56% of the 13F portfolio, value $110,724,818.

    13F-HR 0001104659-26-095933 filed by Atlas Venture Life Science Advisors, 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 1,513,875 shares
    Change vs previous 13F 0 shares

    12.25% of the 13F portfolio, value $96,797,168.

    13F-HR 0001104659-26-061232 filed by Atlas Venture Life Science Advisors, 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 1,513,875 shares
    Change vs previous 13F -628,742 shares

    13.9% of the 13F portfolio, value $120,216,814.

    13F-HR 0001104659-26-014463 filed by Atlas Venture Life Science Advisors, 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 2,142,617 shares
    Change vs previous 13F -241,839 shares

    18.81% of the 13F portfolio, value $141,584,131.

    13F-HR 0001104659-25-111321 filed by Atlas Venture Life Science Advisors, 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 2,384,456 shares
    Change vs previous 13F 0 shares

    19.07% of the 13F portfolio, value $126,280,790.

    13F-HR 0001104659-25-076898 filed by Atlas Venture Life Science Advisors, 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 2,384,456 shares
    Change vs previous 13F -125,000 shares

    22.69% of the 13F portfolio, value $118,364,396.

    13F-HR 0001104659-25-048527 filed by Atlas Venture Life Science Advisors, 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 2,509,456 shares
    Change vs previous 13F 0 shares

    19.41% of the 13F portfolio, value $159,099,510.

    13F-HR 0001104659-25-010152 filed by Atlas Venture Life Science Advisors, 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 2,509,456 shares
    Change vs previous 13F not available

    11.43% of the 13F portfolio, value $123,314,668.

    13F-HR 0001104659-24-116967 filed by Atlas Venture Life Science Advisors, LLC
    Filed (acceptance time not in the bulk data set), ingested

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