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CenterBook Partners LP: MGNI position timeline

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

CenterBook Partners LP held 117,550 MGNI 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 117,550 shares
    Change vs previous 13F -446,606 shares

    0.11% of the 13F portfolio, value $2,231,099.

    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 564,156 shares
    Change vs previous 13F +391,610 shares

    0.36% of the 13F portfolio, value $6,702,173.

    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 172,546 shares
    Change vs previous 13F +99,760 shares

    0.14% of the 13F portfolio, value $2,800,422.

    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).

  4. period ended2025-09-30
    13F 72,786 shares
    Change vs previous 13F -19,480 shares

    0.08% of the 13F portfolio, value $1,585,279.

    13F-HR 0000902664-25-004789 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).

  5. period ended2025-06-30
    13F 92,266 shares
    Change vs previous 13F -224,738 shares

    0.12% of the 13F portfolio, value $2,225,456.

    13F-HR 0000902664-25-003518 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).

  6. period ended2025-03-31
    13F 317,004 shares
    Change vs previous 13F -308,761 shares

    0.23% of the 13F portfolio, value $3,617,016.

    13F-HR 0000902664-25-002221 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).

  7. period ended2024-12-31
    13F 625,765 shares
    Change vs previous 13F not available

    0.6% of the 13F portfolio, value $9,962,179.

    13F-HR 0000902664-25-000921 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).