Skip to content
Disclosery

Rock Springs Capital Management LP: MLYS position timeline

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

Rock Springs Capital Management LP held 484,951 MLYS 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 484,951 shares
    Change vs previous 13F +45,200 shares

    0.64% of the 13F portfolio, value $13,083,978.

    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 439,751 shares
    Change vs previous 13F +12,155 shares

    0.7% of the 13F portfolio, value $11,912,855.

    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 427,596 shares
    Change vs previous 13F +19,283 shares

    0.8% of the 13F portfolio, value $15,517,459.

    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 408,313 shares
    Change vs previous 13F +83,800 shares

    0.91% of the 13F portfolio, value $15,483,229.

    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 324,513 shares
    Change vs previous 13F +3,700 shares

    0.27% of the 13F portfolio, value $4,390,661.

    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 320,813 shares
    Change vs previous 13F +320,813 shares

    0.29% of the 13F portfolio, value $5,094,510.

    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 ended2024-09-30
    13F 0 shares
    Change vs previous 13F not available

    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).

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