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EcoR1 Capital, LLC: MREO position timeline

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

EcoR1 Capital, LLC held 1,000,000 MREO 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 1,000,000 shares
    Change vs previous 13F -12,368,855 shares

    0.02% of the 13F portfolio, value $317,700.

    13F-HR 0000935836-26-000415 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).

  2. period ended2026-03-31
    13F 13,368,855 shares
    Change vs previous 13F +5,512,389 shares

    0.19% of the 13F portfolio, value $4,411,722.

    13F-HR 0000935836-26-000270 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 ended2025-12-31
    13F 7,856,466 shares
    Change vs previous 13F not available

    0.15% of the 13F portfolio, value $3,273,789.

    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).