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Disclosery

Harvey Partners, LLC: MKSI position timeline

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

Harvey Partners, LLC held 141,066 MKSI 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 141,066 shares
    Change vs previous 13F -102,330 shares

    4.35% of the 13F portfolio, value $62,746,157.

    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 243,396 shares
    Change vs previous 13F -45,801 shares

    4.54% of the 13F portfolio, value $55,934,835.

    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 289,197 shares
    Change vs previous 13F +197 shares

    4.15% of the 13F portfolio, value $46,213,681.

    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 289,000 shares
    Change vs previous 13F +19,401 shares

    3.25% of the 13F portfolio, value $35,769,530.

    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).

  5. period ended2025-06-30
    13F 269,599 shares
    Change vs previous 13F +8,599 shares

    2.67% of the 13F portfolio, value $26,787,357.

    13F-HR 0001214659-25-012245 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).

  6. period ended2025-03-31
    13F 261,000 shares
    Change vs previous 13F +71,500 shares

    2.48% of the 13F portfolio, value $20,919,150.

    13F-HR 0001214659-25-007852 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).

  7. period ended2024-12-31
    13F 189,500 shares
    Change vs previous 13F +19,500 shares

    2.23% of the 13F portfolio, value $19,781,905.

    13F-HR 0001214659-25-002810 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).

  8. period ended2024-09-30
    13F 170,000 shares
    Change vs previous 13F not available

    2.13% of the 13F portfolio, value $18,480,700.

    13F-HR 0001214659-24-019173 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).