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ESSEX INVESTMENT MANAGEMENT CO LLC: MASS position timeline

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

ESSEX INVESTMENT MANAGEMENT CO LLC held 470,244 MASS shares at 2026-06-30 per its 13F-HR filed 2026-08-06.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 470,244 shares
    Change vs previous 13F -20,977 shares

    0.54% of the 13F portfolio, value $4,091,123.

    13F-HR 0000201772-26-000005 filed by ESSEX INVESTMENT MANAGEMENT CO 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 491,221 shares
    Change vs previous 13F +8,607 shares

    0.48% of the 13F portfolio, value $3,006,273.

    13F-HR 0000201772-26-000004 filed by ESSEX INVESTMENT MANAGEMENT CO 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 482,614 shares
    Change vs previous 13F -11,335 shares

    0.39% of the 13F portfolio, value $2,533,724.

    13F-HR 0000201772-26-000001 filed by ESSEX INVESTMENT MANAGEMENT CO 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 493,949 shares
    Change vs previous 13F +16,607 shares

    0.66% of the 13F portfolio, value $4,326,993.

    13F-HR 0000201772-25-000008 filed by ESSEX INVESTMENT MANAGEMENT CO 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 477,342 shares
    Change vs previous 13F -3,207 shares

    0.62% of the 13F portfolio, value $3,403,448.

    13F-HR 0000201772-25-000006 filed by ESSEX INVESTMENT MANAGEMENT CO 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 480,549 shares
    Change vs previous 13F not available

    0.45% of the 13F portfolio, value $2,152,860.

    13F-HR 0000201772-25-000005 filed by ESSEX INVESTMENT MANAGEMENT CO LLC
    Filed (acceptance time not in the bulk data set), ingested

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