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RA CAPITAL MANAGEMENT, L.P.: IRON position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of RA CAPITAL MANAGEMENT, L.P. on IRON, newest first. How the timeline and the estimate are built.

RA CAPITAL MANAGEMENT, L.P. held 2,450,221 IRON 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 2,450,221 shares
    Change vs previous 13F 0 shares

    1.56% of the 13F portfolio, value $179,209,164.

    13F-HR 0001104659-26-097251 filed by RA CAPITAL MANAGEMENT, L.P.
    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 2,450,221 shares
    Change vs previous 13F +474,089 shares

    1.66% of the 13F portfolio, value $156,667,131.

    13F-HR 0001104659-26-062637 filed by RA CAPITAL MANAGEMENT, L.P.
    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 1,976,132 shares
    Change vs previous 13F +399,026 shares

    1.61% of the 13F portfolio, value $156,924,642.

    13F-HR 0001104659-26-016482 filed by RA CAPITAL MANAGEMENT, L.P.
    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 1,577,106 shares
    Change vs previous 13F 0 shares

    1.28% of the 13F portfolio, value $104,215,164.

    13F-HR 0001104659-25-112469 filed by RA CAPITAL MANAGEMENT, L.P.
    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 1,577,106 shares
    Change vs previous 13F 0 shares

    1.41% of the 13F portfolio, value $83,523,534.

    13F-HR 0001104659-25-078691 filed by RA CAPITAL MANAGEMENT, L.P.
    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 1,577,106 shares
    Change vs previous 13F not available

    1.31% of the 13F portfolio, value $78,287,542.

    13F-HR 0001104659-25-049549 filed by RA CAPITAL MANAGEMENT, L.P.
    Filed (acceptance time not in the bulk data set), ingested

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