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EcoR1 Capital, LLC: MBX position timeline

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

EcoR1 Capital, LLC held 388,500 MBX 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 388,500 shares
    Change vs previous 13F -388,500 shares

    1.06% of the 13F portfolio, value $21,445,200.

    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 777,000 shares
    Change vs previous 13F -1,346,604 shares

    0.99% of the 13F portfolio, value $23,193,450.

    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 2,123,604 shares
    Change vs previous 13F 0 shares

    3.06% of the 13F portfolio, value $66,978,470.

    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).

  4. period ended2025-09-30
    13F 2,123,604 shares
    Change vs previous 13F +973,810 shares

    1.78% of the 13F portfolio, value $37,163,070.

    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).

  5. period ended2025-06-30
    13F 1,149,794 shares
    Change vs previous 13F -109,479 shares

    0.78% of the 13F portfolio, value $13,119,150.

    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).

  6. period ended2025-03-31
    13F 1,259,273 shares
    Change vs previous 13F 0 shares

    0.55% of the 13F portfolio, value $9,293,435.

    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).

  7. period ended2024-12-31
    13F 1,259,273 shares
    Change vs previous 13F +83,464 shares

    0.93% of the 13F portfolio, value $23,208,401.

    13F-HR 0000935836-25-000164 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).

  8. period ended2024-09-30
    13F 1,175,809 shares
    Change vs previous 13F not available

    1.05% of the 13F portfolio, value $30,547,518.

    13F-HR 0000935836-24-000682 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).