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Polaris Capital Management, LLC: AMPH position timeline

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

Polaris Capital Management, LLC held 43,232 AMPH shares at 2026-06-30 per its 13F-HR filed 2026-07-27.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 43,232 shares
    Change vs previous 13F 0 shares

    0.08% of the 13F portfolio, value $872,422.

    13F-HR 0001144969-26-000005 filed by Polaris Capital 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 43,232 shares
    Change vs previous 13F +7,700 shares

    0.07% of the 13F portfolio, value $846,915.

    13F-HR 0001144969-26-000004 filed by Polaris Capital 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 35,532 shares
    Change vs previous 13F +22,432 shares

    0.08% of the 13F portfolio, value $951,547.

    13F-HR 0001144969-26-000002 filed by Polaris Capital 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 13,100 shares
    Change vs previous 13F -22,000 shares

    0.02% of the 13F portfolio, value $349,115.

    13F-HR 0001144969-25-000010 filed by Polaris Capital 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 35,100 shares
    Change vs previous 13F +4,300 shares

    0.05% of the 13F portfolio, value $805,896.

    13F-HR 0001144969-25-000005 filed by Polaris Capital 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 30,800 shares
    Change vs previous 13F +6,300 shares

    0.05% of the 13F portfolio, value $892,892.

    13F-HR 0001144969-25-000004 filed by Polaris Capital 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 24,500 shares
    Change vs previous 13F not available

    0.04% of the 13F portfolio, value $909,685.

    13F-HR 0001144969-25-000001 filed by Polaris Capital Management, LLC
    Filed (acceptance time not in the bulk data set), ingested

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