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

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

RA CAPITAL MANAGEMENT, L.P. held 6,666,837 RYTM 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 6,666,837 shares
    Change vs previous 13F 0 shares

    6.43% of the 13F portfolio, value $740,218,912.

    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 6,666,837 shares
    Change vs previous 13F 0 shares

    6.14% of the 13F portfolio, value $579,814,814.

    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 6,666,837 shares
    Change vs previous 13F +985,478 shares

    7.31% of the 13F portfolio, value $713,618,232.

    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 5,681,359 shares
    Change vs previous 13F +120,000 shares

    7.07% of the 13F portfolio, value $573,760,445.

    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 5,561,359 shares
    Change vs previous 13F -523,053 shares

    5.92% of the 13F portfolio, value $351,422,275.

    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 6,084,412 shares
    Change vs previous 13F 0 shares

    5.38% of the 13F portfolio, value $322,291,304.

    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).

  7. period ended2024-12-31
    13F 6,084,412 shares
    Change vs previous 13F 0 shares

    4.53% of the 13F portfolio, value $340,605,384.

    13F-HR 0001104659-25-014181 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).

  8. period ended2024-09-30
    13F 6,084,412 shares
    Change vs previous 13F not available

    3.68% of the 13F portfolio, value $318,762,345.

    13F-HR 0001104659-24-119034 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).