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Mountaineer Partners Management, LLC: CENX position timeline

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

Mountaineer Partners Management, LLC held 503,309 CENX 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 503,309 shares
    Change vs previous 13F -80,688 shares

    16.84% of the 13F portfolio, value $23,157,247.

    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 583,997 shares
    Change vs previous 13F -24,478 shares

    17.02% of the 13F portfolio, value $34,274,784.

    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 608,475 shares
    Change vs previous 13F -52,568 shares

    13.34% of the 13F portfolio, value $23,840,050.

    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 661,043 shares
    Change vs previous 13F -44,107 shares

    11.29% of the 13F portfolio, value $19,408,222.

    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 705,150 shares
    Change vs previous 13F +65,777 shares

    8.4% of the 13F portfolio, value $12,706,803.

    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 639,373 shares
    Change vs previous 13F -8,472 shares

    11.36% of the 13F portfolio, value $11,866,762.

    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 647,845 shares
    Change vs previous 13F -759,986 shares

    8.64% of the 13F portfolio, value $11,803,736.

    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).

  8. period ended2024-09-30
    13F/A 1,407,831 shares
    Change vs previous 13F not available

    14.25% of the 13F portfolio, value $22,849,097.

    13F-HR/A 0000919574-24-006813 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).