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MILLENNIUM MANAGEMENT LLC: ATI position timeline

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

MILLENNIUM MANAGEMENT LLC held 875,260 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 875,260 shares
    Change vs previous 13F +256,020 shares

    0.12% of the 13F portfolio, value $172,513,746.

    13F-HR 0001273087-26-000007 filed by MILLENNIUM MANAGEMENT LLC
    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 619,240 shares
    Change vs previous 13F +112,359 shares

    0.07% of the 13F portfolio, value $90,074,650.

    13F-HR 0001273087-26-000004 filed by MILLENNIUM MANAGEMENT LLC
    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 506,881 shares
    Change vs previous 13F +169,290 shares

    0.04% of the 13F portfolio, value $58,169,664.

    13F-HR 0001273087-26-000002 filed by MILLENNIUM MANAGEMENT LLC
    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 337,591 shares
    Change vs previous 13F +48,774 shares

    0.02% of the 13F portfolio, value $27,459,652.

    13F-HR 0001273087-25-000034 filed by MILLENNIUM MANAGEMENT LLC
    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 288,817 shares
    Change vs previous 13F -1,077,244 shares

    0.02% of the 13F portfolio, value $24,936,460.

    13F-HR 0001273087-25-000028 filed by MILLENNIUM MANAGEMENT LLC
    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 1,366,061 shares
    Change vs previous 13F +1,266,124 shares

    0.07% of the 13F portfolio, value $71,076,154.

    13F-HR 0001273087-25-000019 filed by MILLENNIUM MANAGEMENT LLC
    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 99,937 shares
    Change vs previous 13F -1,495,079 shares

    <0.01% of the 13F portfolio, value $5,500,532.

    13F-HR 0001273087-25-000015 filed by MILLENNIUM MANAGEMENT LLC
    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 1,595,016 shares
    Change vs previous 13F not available

    0.09% of the 13F portfolio, value $106,722,521.

    13F-HR 0001273087-24-000118 filed by MILLENNIUM MANAGEMENT LLC
    Filed (acceptance time not in the bulk data set), ingested

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