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MPM ASSET MANAGEMENT LLC: HOWL position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of MPM ASSET MANAGEMENT LLC on HOWL, newest first. How the timeline and the estimate are built.

MPM ASSET MANAGEMENT LLC held 4,309,860 HOWL shares at 2025-09-30 per its 13F-HR filed 2025-11-14.

the latest 13F is the newest step

  1. period ended2025-09-30
    13F 4,309,860 shares
    Change vs previous 13F 0 shares

    19.08% of the 13F portfolio, value $8,490,424.

    13F-HR 0001193125-25-283116 filed by MPM ASSET 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 ended2025-06-30
    13F 4,309,860 shares
    Change vs previous 13F 0 shares

    10.84% of the 13F portfolio, value $4,697,747.

    13F-HR 0000950123-25-008430 filed by MPM ASSET 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 ended2025-03-31
    13F 4,309,860 shares
    Change vs previous 13F +25,688 shares

    6.03% of the 13F portfolio, value $4,189,184.

    13F-HR 0000950123-25-005757 filed by MPM ASSET 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 ended2024-12-31
    13F 4,284,172 shares
    Change vs previous 13F 0 shares

    5.1% of the 13F portfolio, value $6,340,575.

    13F-HR 0000950123-25-002793 filed by MPM ASSET 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 ended2024-09-30
    13F 4,284,172 shares
    Change vs previous 13F 0 shares

    6.25% of the 13F portfolio, value $9,082,445.

    13F-HR 0000950123-24-011020 filed by MPM ASSET 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 ended2024-06-30
    13F 4,284,172 shares
    Change vs previous 13F 0 shares

    5.74% of the 13F portfolio, value $10,453,380.

    13F-HR 0000950123-24-008624 filed by MPM ASSET 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 ended2024-03-31
    13F 4,284,172 shares
    Change vs previous 13F 0 shares

    11.32% of the 13F portfolio, value $27,761,435.

    13F-HR 0000950123-24-005709 filed by MPM ASSET 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 ended2023-12-31
    13F 4,284,172 shares
    Change vs previous 13F not available

    8.13% of the 13F portfolio, value $16,536,904.

    13F-HR 0000950123-24-001862 filed by MPM ASSET MANAGEMENT LLC
    Filed (acceptance time not in the bulk data set), ingested

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