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

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

RA CAPITAL MANAGEMENT, L.P. held 6,995,858 SEPN 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 6,995,858 shares
    Change vs previous 13F 0 shares

    2.04% of the 13F portfolio, value $234,291,284.

    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 6,995,858 shares
    Change vs previous 13F 0 shares

    1.78% of the 13F portfolio, value $168,110,468.

    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 6,995,858 shares
    Change vs previous 13F 0 shares

    2% of the 13F portfolio, value $195,044,521.

    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 6,995,858 shares
    Change vs previous 13F 0 shares

    1.62% of the 13F portfolio, value $131,592,089.

    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 6,995,858 shares
    Change vs previous 13F 0 shares

    1.25% of the 13F portfolio, value $73,946,219.

    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 6,995,858 shares
    Change vs previous 13F 0 shares

    0.68% of the 13F portfolio, value $40,506,018.

    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 6,995,858 shares
    Change vs previous 13F not available

    2.13% of the 13F portfolio, value $160,205,148.

    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).