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Disclosery

CenterBook Partners LP: ALK position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of CenterBook Partners LP on ALK, newest first. How the timeline and the estimate are built.

CenterBook Partners LP held 19,897 ALK 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 19,897 shares
    Change vs previous 13F -238,289 shares

    0.05% of the 13F portfolio, value $1,038,623.

    13F-HR 0001872738-26-000010 filed by CenterBook Partners LP
    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 258,186 shares
    Change vs previous 13F +195,976 shares

    0.51% of the 13F portfolio, value $9,496,081.

    13F-HR 0001872738-26-000008 filed by CenterBook Partners LP
    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 62,210 shares
    Change vs previous 13F not available

    0.15% of the 13F portfolio, value $3,129,163.

    13F-HR 0000902664-26-000841 filed by CenterBook Partners LP
    Filed (acceptance time not in the bulk data set), ingested

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