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Disclosery

Harvey Partners, LLC: MTRN position timeline

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

Harvey Partners, LLC held 220,068 MTRN 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 220,068 shares
    Change vs previous 13F -73,053 shares

    4.54% of the 13F portfolio, value $65,446,023.

    13F-HR 0001214659-26-010396 filed by Harvey Partners, 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 293,121 shares
    Change vs previous 13F -26,379 shares

    3.44% of the 13F portfolio, value $42,399,953.

    13F-HR 0001214659-26-006431 filed by Harvey Partners, 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 319,500 shares
    Change vs previous 13F +1,500 shares

    3.57% of the 13F portfolio, value $39,720,240.

    13F-HR 0001214659-26-001996 filed by Harvey Partners, 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 318,000 shares
    Change vs previous 13F not available

    3.49% of the 13F portfolio, value $38,417,580.

    13F-HR 0001214659-25-016663 filed by Harvey Partners, LLC
    Filed (acceptance time not in the bulk data set), ingested

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