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SEI INVESTMENTS CO: ATRO position timeline

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

SEI INVESTMENTS CO held 46,733 ATRO 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 46,733 shares
    Change vs previous 13F -24,306 shares

    <0.01% of the 13F portfolio, value $3,797,524.

    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 71,039 shares
    Change vs previous 13F +43,007 shares

    <0.01% of the 13F portfolio, value $4,740,432.

    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 28,032 shares
    Change vs previous 13F +4,413 shares

    <0.01% of the 13F portfolio, value $1,520,452.

    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 23,619 shares
    Change vs previous 13F -8,413 shares

    <0.01% of the 13F portfolio, value $1,077,256.

    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 32,032 shares
    Change vs previous 13F +15,084 shares

    <0.01% of the 13F portfolio, value $1,072,428.

    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 16,948 shares
    Change vs previous 13F not available

    <0.01% of the 13F portfolio, value $409,633.

    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).