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Disclosery

Hudson Bay Capital Management LP: ATI position timeline

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

Hudson Bay Capital Management LP held 50,919 ATI 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 50,919 shares
    Change vs previous 13F +23,522 shares

    0.05% of the 13F portfolio, value $10,036,135.

    13F-HR 0001393825-26-000058 filed by Hudson Bay 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 27,397 shares
    Change vs previous 13F -64,499 shares

    0.02% of the 13F portfolio, value $3,985,168.

    13F-HR 0001393825-26-000041 filed by Hudson Bay 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 91,896 shares
    Change vs previous 13F -62,888 shares

    0.06% of the 13F portfolio, value $10,545,985.

    13F-HR 0001393825-26-000021 filed by Hudson Bay 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/A 154,784 shares
    Change vs previous 13F -52,019 shares

    0.08% of the 13F portfolio, value $12,590,131.

    13F-HR/A 0001393825-25-000093 filed by Hudson Bay 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/A 206,803 shares
    Change vs previous 13F -65,342 shares

    0.12% of the 13F portfolio, value $17,855,371.

    13F-HR/A 0001393825-25-000066 filed by Hudson Bay 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 272,145 shares
    Change vs previous 13F +70,532 shares

    0.09% of the 13F portfolio, value $14,159,704.

    13F-HR 0001393825-25-000010 filed by Hudson Bay 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 201,613 shares
    Change vs previous 13F not available

    0.07% of the 13F portfolio, value $11,096,780.

    13F-HR 0002033916-25-000027 filed by Hudson Bay Capital Management LP
    Filed (acceptance time not in the bulk data set), ingested

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