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Disclosery

Rock Springs Capital Management LP: WST position timeline

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

Rock Springs Capital Management LP held 0 WST 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 -9,750 shares

    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).

    Exited: the 13F for this period no longer lists the position.

  2. period ended2025-09-30
    13F 9,750 shares
    Change vs previous 13F -41,280 shares

    0.15% of the 13F portfolio, value $2,557,718.

    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).

  3. period ended2025-06-30
    13F 51,030 shares
    Change vs previous 13F -9,220 shares

    0.7% of the 13F portfolio, value $11,165,364.

    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).

  4. period ended2025-03-31
    13F 60,250 shares
    Change vs previous 13F -108,500 shares

    0.77% of the 13F portfolio, value $13,488,770.

    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).

  5. period ended2024-12-31
    13F 168,750 shares
    Change vs previous 13F +1,000 shares

    2.1% of the 13F portfolio, value $55,275,750.

    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).

  6. period ended2024-09-30
    13F 167,750 shares
    Change vs previous 13F not available

    1.64% of the 13F portfolio, value $50,351,840.

    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).