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EcoR1 Capital, LLC: ATRA position timeline

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

EcoR1 Capital, LLC held 1,552,000 ATRA 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 1,552,000 shares
    Change vs previous 13F +1,452,407 shares

    0.88% of the 13F portfolio, value $17,816,960.

    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 99,593 shares
    Change vs previous 13F -473,590 shares

    0.02% of the 13F portfolio, value $471,075.

    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 573,183 shares
    Change vs previous 13F 0 shares

    0.47% of the 13F portfolio, value $10,368,880.

    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 573,183 shares
    Change vs previous 13F 0 shares

    0.39% of the 13F portfolio, value $8,213,712.

    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 573,183 shares
    Change vs previous 13F 0 shares

    0.26% of the 13F portfolio, value $4,424,973.

    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 573,183 shares
    Change vs previous 13F +41,049 shares

    0.2% of the 13F portfolio, value $3,404,707.

    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 532,134 shares
    Change vs previous 13F +63,196 shares

    0.28% of the 13F portfolio, value $7,082,704.

    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 468,938 shares
    Change vs previous 13F not available

    0.13% of the 13F portfolio, value $3,812,466.

    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).