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WELLINGTON MANAGEMENT GROUP LLP: ATI position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of WELLINGTON MANAGEMENT GROUP LLP on ATI, newest first. How the timeline and the estimate are built.

WELLINGTON MANAGEMENT GROUP LLP held 81,401 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 81,401 shares
    Change vs previous 13F +5,656 shares

    <0.01% of the 13F portfolio, value $16,044,137.

    13F-HR 0000902219-26-000311 filed by WELLINGTON MANAGEMENT GROUP LLP
    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 75,745 shares
    Change vs previous 13F -301,613 shares

    <0.01% of the 13F portfolio, value $11,017,867.

    13F-HR 0000902219-26-000209 filed by WELLINGTON MANAGEMENT GROUP LLP
    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 377,358 shares
    Change vs previous 13F -79,942 shares

    0.01% of the 13F portfolio, value $43,305,604.

    13F-HR 0000902219-26-000103 filed by WELLINGTON MANAGEMENT GROUP LLP
    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 457,300 shares
    Change vs previous 13F -10,069 shares

    0.01% of the 13F portfolio, value $37,196,783.

    13F-HR 0000902219-25-000462 filed by WELLINGTON MANAGEMENT GROUP LLP
    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 467,369 shares
    Change vs previous 13F -50,824 shares

    0.01% of the 13F portfolio, value $40,352,640.

    13F-HR 0000902219-25-000356 filed by WELLINGTON MANAGEMENT GROUP LLP
    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 518,193 shares
    Change vs previous 13F +66,968 shares

    0.01% of the 13F portfolio, value $26,961,582.

    13F-HR 0000902219-25-000242 filed by WELLINGTON MANAGEMENT GROUP LLP
    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/A 451,225 shares
    Change vs previous 13F -109,486 shares

    <0.01% of the 13F portfolio, value $24,835,424.

    13F-HR 0000902219-25-000131 filed by WELLINGTON MANAGEMENT GROUP LLP
    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 560,711 shares
    Change vs previous 13F not available

    0.01% of the 13F portfolio, value $37,517,173.

    13F-HR 0000902219-24-000498 filed by WELLINGTON MANAGEMENT GROUP LLP
    Filed (acceptance time not in the bulk data set), ingested

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