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Disclosery

Senator Investment Group LP: ATI position timeline

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

Senator Investment Group LP held 80,000 ATI shares at 2026-06-30 per its 13F-HR filed 2026-08-12.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 80,000 shares
    Change vs previous 13F -65,000 shares

    0.58% of the 13F portfolio, value $15,768,000.

    13F-HR 0001443689-26-000009 filed by Senator Investment Group 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 145,000 shares
    Change vs previous 13F -180,000 shares

    0.97% of the 13F portfolio, value $21,091,700.

    13F-HR 0001443689-26-000006 filed by Senator Investment Group 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 325,000 shares
    Change vs previous 13F 0 shares

    1.5% of the 13F portfolio, value $37,297,000.

    13F-HR 0001443689-26-000003 filed by Senator Investment Group 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 325,000 shares
    Change vs previous 13F -425,000 shares

    0.98% of the 13F portfolio, value $26,435,500.

    13F-HR 0001443689-25-000020 filed by Senator Investment Group 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 750,000 shares
    Change vs previous 13F -462,500 shares

    2.5% of the 13F portfolio, value $64,755,000.

    13F-HR 0001443689-25-000014 filed by Senator Investment Group 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 1,212,500 shares
    Change vs previous 13F +493,944 shares

    3.35% of the 13F portfolio, value $63,086,375.

    13F-HR 0001443689-25-000009 filed by Senator Investment Group 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 718,556 shares
    Change vs previous 13F +28,556 shares

    1.16% of the 13F portfolio, value $39,549,322.

    13F-HR 0001443689-25-000003 filed by Senator Investment Group 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 690,000 shares
    Change vs previous 13F not available

    2.19% of the 13F portfolio, value $46,167,900.

    13F-HR 0001443689-24-000016 filed by Senator Investment Group LP
    Filed (acceptance time not in the bulk data set), ingested

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