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TANAKA CAPITAL MANAGEMENT INC: ONTO position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of TANAKA CAPITAL MANAGEMENT INC on ONTO, newest first. How the timeline and the estimate are built.

TANAKA CAPITAL MANAGEMENT INC held 12,448 ONTO shares at 2026-03-31 per its 13F-HR filed 2026-05-18.

the latest 13F is the newest step

  1. period ended2026-03-31
    13F 12,448 shares
    Change vs previous 13F -385 shares

    4.26% of the 13F portfolio, value $2,553,000.

    13F-HR 0000816788-26-000002 filed by TANAKA CAPITAL MANAGEMENT INC
    Filed (acceptance time not in the bulk data set), ingested

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

  2. period ended2025-12-31
    13F 12,833 shares
    Change vs previous 13F 0 shares

    3.7% of the 13F portfolio, value $2,026,000.

    13F-HR 0000816788-26-000001 filed by TANAKA CAPITAL MANAGEMENT INC
    Filed (acceptance time not in the bulk data set), ingested

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

  3. period ended2025-09-30
    13F 12,833 shares
    Change vs previous 13F 0 shares

    2.99% of the 13F portfolio, value $1,658,000.

    13F-HR 0000816788-25-000005 filed by TANAKA CAPITAL MANAGEMENT INC
    Filed (acceptance time not in the bulk data set), ingested

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

  4. period ended2025-03-31
    13F 12,833 shares
    Change vs previous 13F -1,587 shares

    3.71% of the 13F portfolio, value $1,557,000.

    13F-HR 0000816788-25-000002 filed by TANAKA CAPITAL MANAGEMENT INC
    Filed (acceptance time not in the bulk data set), ingested

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

  5. period ended2024-12-31
    13F 14,420 shares
    Change vs previous 13F -6 shares

    5.49% of the 13F portfolio, value $2,403,000.

    13F-HR 0000816788-25-000001 filed by TANAKA CAPITAL MANAGEMENT INC
    Filed (acceptance time not in the bulk data set), ingested

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

  6. period ended2024-09-30
    13F 14,426 shares
    Change vs previous 13F -5,735 shares

    6.93% of the 13F portfolio, value $2,995,000.

    13F-HR 0000816788-24-000004 filed by TANAKA CAPITAL MANAGEMENT INC
    Filed (acceptance time not in the bulk data set), ingested

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

  7. period ended2024-06-30
    13F 20,161 shares
    Change vs previous 13F not available

    10.48% of the 13F portfolio, value $4,427,000.

    13F-HR 0000816788-24-000003 filed by TANAKA CAPITAL MANAGEMENT INC
    Filed (acceptance time not in the bulk data set), ingested

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