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Disclosery

Rock Springs Capital Management LP: RARE position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Rock Springs Capital Management LP on RARE, newest first. How the timeline and the estimate are built.

Rock Springs Capital Management LP held 967,855 RARE 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 967,855 shares
    Change vs previous 13F -250,918 shares

    1.58% of the 13F portfolio, value $32,316,678.

    13F-HR 0001172661-26-003527 filed by Rock Springs Capital Management LP
    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 1,218,773 shares
    Change vs previous 13F -48,468 shares

    1.5% of the 13F portfolio, value $25,533,294.

    13F-HR 0001172661-26-002225 filed by Rock Springs Capital Management LP
    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 1,267,241 shares
    Change vs previous 13F +20,900 shares

    1.5% of the 13F portfolio, value $29,146,543.

    13F-HR 0001172661-26-000917 filed by Rock Springs Capital Management LP
    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 1,246,341 shares
    Change vs previous 13F -144,731 shares

    2.19% of the 13F portfolio, value $37,489,937.

    13F-HR 0001172661-25-004882 filed by Rock Springs Capital Management LP
    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 1,391,072 shares
    Change vs previous 13F -3,362 shares

    3.15% of the 13F portfolio, value $50,579,378.

    13F-HR 0001172661-25-003273 filed by Rock Springs Capital Management LP
    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 1,394,434 shares
    Change vs previous 13F -345,379 shares

    2.89% of the 13F portfolio, value $50,492,455.

    13F-HR 0001172661-25-001953 filed by Rock Springs Capital Management LP
    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 1,739,813 shares
    Change vs previous 13F -238,459 shares

    2.79% of the 13F portfolio, value $73,193,933.

    13F-HR 0001172661-25-000867 filed by Rock Springs Capital Management LP
    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 1,978,272 shares
    Change vs previous 13F not available

    3.58% of the 13F portfolio, value $109,893,010.

    13F-HR 0001172661-24-004721 filed by Rock Springs Capital Management LP
    Filed (acceptance time not in the bulk data set), ingested

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