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Marathon Partners Equity Management, LLC: ATMU position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Marathon Partners Equity Management, LLC on ATMU, newest first. How the timeline and the estimate are built.

Marathon Partners Equity Management, LLC held 77,000 ATMU 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 77,000 shares
    Change vs previous 13F +2,000 shares

    3.87% of the 13F portfolio, value $3,926,230.

    13F-HR 0000919574-26-005181 filed by Marathon Partners Equity 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 75,000 shares
    Change vs previous 13F -5,000 shares

    4.86% of the 13F portfolio, value $4,257,750.

    13F-HR 0000919574-26-003160 filed by Marathon Partners Equity 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 80,000 shares
    Change vs previous 13F -32,500 shares

    4.13% of the 13F portfolio, value $4,152,800.

    13F-HR 0000919574-26-000990 filed by Marathon Partners Equity 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 112,500 shares
    Change vs previous 13F -25,000 shares

    4.05% of the 13F portfolio, value $5,072,625.

    13F-HR 0000919574-25-006796 filed by Marathon Partners Equity 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 137,500 shares
    Change vs previous 13F -2,500 shares

    4.54% of the 13F portfolio, value $5,007,750.

    13F-HR 0000919574-25-004636 filed by Marathon Partners Equity 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 140,000 shares
    Change vs previous 13F -5,000 shares

    5.41% of the 13F portfolio, value $5,142,200.

    13F-HR 0000919574-25-003063 filed by Marathon Partners Equity 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 145,000 shares
    Change vs previous 13F not available

    5.46% of the 13F portfolio, value $5,681,100.

    13F-HR 0000919574-25-001196 filed by Marathon Partners Equity Management, LLC
    Filed (acceptance time not in the bulk data set), ingested

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