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Disclosery

Rock Springs Capital Management LP: ARGX position timeline

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

Rock Springs Capital Management LP held 52,750 ARGX 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 52,750 shares
    Change vs previous 13F -45,750 shares

    2.39% of the 13F portfolio, value $48,939,868.

    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 98,500 shares
    Change vs previous 13F -4,750 shares

    4.24% of the 13F portfolio, value $71,929,625.

    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 103,250 shares
    Change vs previous 13F -39,500 shares

    4.45% of the 13F portfolio, value $86,828,088.

    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 142,750 shares
    Change vs previous 13F -33,000 shares

    6.15% of the 13F portfolio, value $105,286,690.

    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 175,750 shares
    Change vs previous 13F 0 shares

    6.04% of the 13F portfolio, value $96,876,915.

    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 175,750 shares
    Change vs previous 13F -53,850 shares

    5.95% of the 13F portfolio, value $104,020,274.

    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 229,600 shares
    Change vs previous 13F -3,900 shares

    5.38% of the 13F portfolio, value $141,204,000.

    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 233,500 shares
    Change vs previous 13F not available

    4.12% of the 13F portfolio, value $126,575,680.

    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).