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Nierenberg Investment Management Company, LLC: TNDM position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Nierenberg Investment Management Company, LLC on TNDM, newest first. How the timeline and the estimate are built.

Nierenberg Investment Management Company, LLC held 158,910 TNDM shares at 2026-06-30 per its 13F-HR filed 2026-08-11.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 158,910 shares
    Change vs previous 13F +79,400 shares

    1.19% of the 13F portfolio, value $2,397,952.

    13F-HR 0001941040-26-000552 filed by Nierenberg Investment Management Company, 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 79,510 shares
    Change vs previous 13F +34,955 shares

    0.76% of the 13F portfolio, value $1,524,207.

    13F-HR 0001941040-26-000327 filed by Nierenberg Investment Management Company, 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 44,555 shares
    Change vs previous 13F not available

    0.49% of the 13F portfolio, value $979,319.

    13F-HR 0001941040-26-000138 filed by Nierenberg Investment Management Company, LLC
    Filed (acceptance time not in the bulk data set), ingested

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