Skip to content
Disclosery

Mountaineer Partners Management, LLC: AMBP position timeline

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

Mountaineer Partners Management, LLC held 1,722,234 AMBP shares at 2026-06-30 per its 13F-HR filed 2026-08-13.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F/A 1,722,234 shares
    Change vs previous 13F -155,848 shares

    5.94% of the 13F portfolio, value $8,163,389.

    13F-HR 0000919574-26-005107 filed by Mountaineer Partners 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 1,878,082 shares
    Change vs previous 13F +408,602 shares

    3.78% of the 13F portfolio, value $7,606,233.

    13F-HR 0000919574-26-003280 filed by Mountaineer Partners 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 1,469,480 shares
    Change vs previous 13F -69,004 shares

    3.37% of the 13F portfolio, value $6,024,868.

    13F-HR 0000919574-26-000943 filed by Mountaineer Partners 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 1,538,484 shares
    Change vs previous 13F 0 shares

    3.57% of the 13F portfolio, value $6,138,551.

    13F-HR 0000919574-25-006893 filed by Mountaineer Partners 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 1,538,484 shares
    Change vs previous 13F +480,764 shares

    4.35% of the 13F portfolio, value $6,584,712.

    13F-HR 0000919574-25-004802 filed by Mountaineer Partners 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 1,057,720 shares
    Change vs previous 13F 0 shares

    3.06% of the 13F portfolio, value $3,194,314.

    13F-HR 0000919574-25-003166 filed by Mountaineer Partners 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 1,057,720 shares
    Change vs previous 13F not available

    2.33% of the 13F portfolio, value $3,183,737.

    13F-HR 0000919574-25-001213 filed by Mountaineer Partners Management, LLC
    Filed (acceptance time not in the bulk data set), ingested

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