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Disclosery

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

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

RA CAPITAL MANAGEMENT, L.P. held 0 MTSR shares at 2025-12-31 per its 13F-HR filed 2026-02-17.

the latest 13F is the newest step

  1. period ended2025-12-31
    13F 0 shares
    Change vs previous 13F -675,525 shares

    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).

    Exited: the 13F for this period no longer lists the position.

  2. period ended2025-09-30
    13F 675,525 shares
    Change vs previous 13F 0 shares

    0.44% of the 13F portfolio, value $35,350,223.

    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).

  3. period ended2025-06-30
    13F 675,525 shares
    Change vs previous 13F 0 shares

    0.32% of the 13F portfolio, value $19,218,686.

    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).

  4. period ended2025-03-31
    13F 675,525 shares
    Change vs previous 13F not available

    0.31% of the 13F portfolio, value $18,387,791.

    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).