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

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

RA CAPITAL MANAGEMENT, L.P. held 9,905,045 SION 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 9,905,045 shares
    Change vs previous 13F 0 shares

    3.79% of the 13F portfolio, value $435,722,930.

    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 9,905,045 shares
    Change vs previous 13F 0 shares

    4.21% of the 13F portfolio, value $397,093,254.

    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 9,905,045 shares
    Change vs previous 13F -540,277 shares

    4.17% of the 13F portfolio, value $407,493,551.

    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 10,445,322 shares
    Change vs previous 13F 0 shares

    3.79% of the 13F portfolio, value $307,196,920.

    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 10,445,322 shares
    Change vs previous 13F 0 shares

    3.05% of the 13F portfolio, value $181,226,337.

    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 10,445,322 shares
    Change vs previous 13F not available

    1.82% of the 13F portfolio, value $109,258,068.

    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).