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BEACONLIGHT CAPITAL, LLC: CSTM position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of BEACONLIGHT CAPITAL, LLC on CSTM, newest first. How the timeline and the estimate are built.

BEACONLIGHT CAPITAL, LLC held 779,899 CSTM 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 779,899 shares
    Change vs previous 13F -391,913 shares

    10.94% of the 13F portfolio, value $24,855,381.

    13F-HR 0000919574-26-005460 filed by BEACONLIGHT CAPITAL, 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 1,171,812 shares
    Change vs previous 13F -168,122 shares

    16.24% of the 13F portfolio, value $28,803,139.

    13F-HR 0000919574-26-003095 filed by BEACONLIGHT CAPITAL, 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 1,339,934 shares
    Change vs previous 13F +66,429 shares

    14.75% of the 13F portfolio, value $25,257,756.

    13F-HR 0000919574-26-001169 filed by BEACONLIGHT CAPITAL, 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 1,273,505 shares
    Change vs previous 13F +344,970 shares

    9.35% of the 13F portfolio, value $18,949,754.

    13F-HR 0000919574-25-006888 filed by BEACONLIGHT CAPITAL, 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 928,535 shares
    Change vs previous 13F -34,844 shares

    7.23% of the 13F portfolio, value $12,349,516.

    13F-HR 0000919574-25-004668 filed by BEACONLIGHT CAPITAL, 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 963,379 shares
    Change vs previous 13F +149,062 shares

    6.64% of the 13F portfolio, value $9,720,494.

    13F-HR 0000919574-25-003074 filed by BEACONLIGHT CAPITAL, 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 814,317 shares
    Change vs previous 13F -67,299 shares

    3.34% of the 13F portfolio, value $8,363,036.

    13F-HR 0000919574-25-001173 filed by BEACONLIGHT CAPITAL, 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 881,616 shares
    Change vs previous 13F not available

    5.9% of the 13F portfolio, value $14,335,076.

    13F-HR 0000919574-24-006424 filed by BEACONLIGHT CAPITAL, LLC
    Filed (acceptance time not in the bulk data set), ingested

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