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Disclosery

Rock Springs Capital Management LP: MBX position timeline

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

Rock Springs Capital Management LP held 298,218 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 298,218 shares
    Change vs previous 13F +10,251 shares

    0.8% of the 13F portfolio, value $16,461,634.

    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 287,967 shares
    Change vs previous 13F +5,343 shares

    0.51% of the 13F portfolio, value $8,595,815.

    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 282,624 shares
    Change vs previous 13F 0 shares

    0.46% of the 13F portfolio, value $8,913,961.

    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 282,624 shares
    Change vs previous 13F not available

    0.29% of the 13F portfolio, value $4,945,920.

    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).