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Disclosery

SEI INVESTMENTS CO: ATKR position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of SEI INVESTMENTS CO on ATKR, newest first. How the timeline and the estimate are built.

SEI INVESTMENTS CO held 244,346 ATKR 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 244,346 shares
    Change vs previous 13F +35,892 shares

    0.02% of the 13F portfolio, value $18,580,060.

    13F-HR 0002048251-26-006553 filed by SEI INVESTMENTS CO
    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 208,454 shares
    Change vs previous 13F +2,536 shares

    0.01% of the 13F portfolio, value $12,280,049.

    13F-HR 0002048251-26-003739 filed by SEI INVESTMENTS CO
    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 205,918 shares
    Change vs previous 13F +181,885 shares

    0.01% of the 13F portfolio, value $13,024,363.

    13F-HR 0000350894-26-000005 filed by SEI INVESTMENTS CO
    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 24,033 shares
    Change vs previous 13F -29,947 shares

    <0.01% of the 13F portfolio, value $1,507,793.

    13F-HR 0002048251-25-002343 filed by SEI INVESTMENTS CO
    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 53,980 shares
    Change vs previous 13F +24,186 shares

    <0.01% of the 13F portfolio, value $3,808,250.

    13F-HR 0001041062-25-000162 filed by SEI INVESTMENTS CO
    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/A 29,794 shares
    Change vs previous 13F +2,704 shares

    <0.01% of the 13F portfolio, value $1,787,373.

    13F-HR/A 0001041062-25-000106 filed by SEI INVESTMENTS CO
    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 27,090 shares
    Change vs previous 13F -24,896 shares

    <0.01% of the 13F portfolio, value $2,260,570.

    13F-HR 0001041062-25-000019 filed by SEI INVESTMENTS CO
    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 51,986 shares
    Change vs previous 13F not available

    0.01% of the 13F portfolio, value $4,405,237.

    13F-HR 0001041062-24-000165 filed by SEI INVESTMENTS CO
    Filed (acceptance time not in the bulk data set), ingested

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