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Disclosery

EcoR1 Capital, LLC: MTSR position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of EcoR1 Capital, LLC on MTSR, newest first. How the timeline and the estimate are built.

EcoR1 Capital, LLC 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 -271,529 shares

    13F-HR 0000935836-26-000101 filed by EcoR1 Capital, LLC
    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 271,529 shares
    Change vs previous 13F 0 shares

    0.68% of the 13F portfolio, value $14,209,113.

    13F-HR 0000935836-25-000671 filed by EcoR1 Capital, LLC
    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 271,529 shares
    Change vs previous 13F +221,529 shares

    0.46% of the 13F portfolio, value $7,725,000.

    13F-HR 0000935836-25-000506 filed by EcoR1 Capital, LLC
    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 50,000 shares
    Change vs previous 13F not available

    0.08% of the 13F portfolio, value $1,361,000.

    13F-HR 0000935836-25-000338 filed by EcoR1 Capital, LLC
    Filed (acceptance time not in the bulk data set), ingested

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