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Disclosery

GROUP ONE TRADING LLC: ZTS position timeline

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

GROUP ONE TRADING LLC held 125,568 ZTS 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 125,568 shares
    Change vs previous 13F +74,906 shares

    0.26% of the 13F portfolio, value $9,023,316.

    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 50,662 shares
    Change vs previous 13F -3,250 shares

    0.2% of the 13F portfolio, value $5,988,755.

    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 53,912 shares
    Change vs previous 13F +36,727 shares

    0.2% of the 13F portfolio, value $6,783,208.

    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 17,185 shares
    Change vs previous 13F -19,402 shares

    0.08% of the 13F portfolio, value $2,514,509.

    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 36,587 shares
    Change vs previous 13F -12,012 shares

    0.19% of the 13F portfolio, value $5,705,743.

    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).

  6. period ended2025-03-31
    13F 48,599 shares
    Change vs previous 13F +36,163 shares

    0.33% of the 13F portfolio, value $8,001,825.

    13F-HR 0000932540-25-000027 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).

  7. period ended2024-12-31
    13F/A 12,436 shares
    Change vs previous 13F +2,913 shares

    0.07% of the 13F portfolio, value $2,026,197.

    13F-HR/A 0000932540-25-000028 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).

  8. period ended2024-09-30
    13F 9,523 shares
    Change vs previous 13F not available

    0.07% of the 13F portfolio, value $1,860,604.

    13F-HR 0000932540-24-000015 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).