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Alyeska Investment Group, L.P.: MASI position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Alyeska Investment Group, L.P. on MASI, newest first. How the timeline and the estimate are built.

Alyeska Investment Group, L.P. held 0 MASI shares at 2026-03-31 per its 13F-HR filed 2026-05-15.

the latest 13F is the newest step

  1. period ended2026-03-31
    13F 0 shares
    Change vs previous 13F -1,259,307 shares

    13F-HR 0001172661-26-002284 filed by Alyeska Investment Group, L.P.
    Filed (acceptance time not in the bulk data set), ingested

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

    Exited: the 13F for this period no longer lists the position.

  2. period ended2025-12-31
    13F 1,259,307 shares
    Change vs previous 13F -121,778 shares

    0.46% of the 13F portfolio, value $163,785,468.

    13F-HR 0001172661-26-000737 filed by Alyeska Investment Group, L.P.
    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 1,381,085 shares
    Change vs previous 13F +246,595 shares

    0.62% of the 13F portfolio, value $203,779,092.

    13F-HR 0001172661-25-005150 filed by Alyeska Investment Group, L.P.
    Filed (acceptance time not in the bulk data set), ingested

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

  4. period ended2025-06-30
    13F 1,134,490 shares
    Change vs previous 13F +411,956 shares

    0.68% of the 13F portfolio, value $190,843,908.

    13F-HR 0001172661-25-003461 filed by Alyeska Investment Group, L.P.
    Filed (acceptance time not in the bulk data set), ingested

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

  5. period ended2025-03-31
    13F 722,534 shares
    Change vs previous 13F +143,899 shares

    0.48% of the 13F portfolio, value $120,374,164.

    13F-HR 0001172661-25-002312 filed by Alyeska Investment Group, L.P.
    Filed (acceptance time not in the bulk data set), ingested

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

  6. period ended2024-12-31
    13F 578,635 shares
    Change vs previous 13F -166,492 shares

    0.36% of the 13F portfolio, value $95,648,366.

    13F-HR 0001172661-25-001146 filed by Alyeska Investment Group, L.P.
    Filed (acceptance time not in the bulk data set), ingested

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

  7. period ended2024-09-30
    13F 745,127 shares
    Change vs previous 13F not available

    0.51% of the 13F portfolio, value $99,347,783.

    13F-HR 0001172661-24-005186 filed by Alyeska Investment Group, L.P.
    Filed (acceptance time not in the bulk data set), ingested

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