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Disclosery

GROUP ONE TRADING LLC: KLAC position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of GROUP ONE TRADING LLC on KLAC, newest first. How the timeline and the estimate are built.

GROUP ONE TRADING LLC held 6,218 KLAC 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 6,218 shares
    Change vs previous 13F +4,505 shares

    0.05% of the 13F portfolio, value $1,876,033.

    13F-HR 0000932540-26-000011 filed by GROUP ONE TRADING 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 1,713 shares
    Change vs previous 13F -129 shares

    0.08% of the 13F portfolio, value $2,522,238.

    13F-HR 0000932540-26-000005 filed by GROUP ONE TRADING 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 1,842 shares
    Change vs previous 13F -1,755 shares

    0.07% of the 13F portfolio, value $2,238,177.

    13F-HR 0000932540-26-000002 filed by GROUP ONE TRADING 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 3,597 shares
    Change vs previous 13F +1,238 shares

    0.12% of the 13F portfolio, value $3,879,724.

    13F-HR 0000932540-25-000040 filed by GROUP ONE TRADING 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 2,359 shares
    Change vs previous 13F not available

    0.07% of the 13F portfolio, value $2,113,051.

    13F-HR 0000932540-25-000034 filed by GROUP ONE TRADING LLC
    Filed (acceptance time not in the bulk data set), ingested

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