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BLAIR WILLIAM & CO/IL: MCO position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of BLAIR WILLIAM & CO/IL on MCO, newest first. How the timeline and the estimate are built.

BLAIR WILLIAM & CO/IL held 63,605 MCO 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 63,605 shares
    Change vs previous 13F -3,349 shares

    0.08% of the 13F portfolio, value $28,807,921.

    13F-HR 0001104659-26-093821 filed by BLAIR WILLIAM & CO/IL
    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 66,954 shares
    Change vs previous 13F +41,600 shares

    0.08% of the 13F portfolio, value $29,208,476.

    13F-HR 0001104659-26-057897 filed by BLAIR WILLIAM & CO/IL
    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 25,354 shares
    Change vs previous 13F -219 shares

    0.03% of the 13F portfolio, value $12,951,959.

    13F-HR 0001104659-26-015563 filed by BLAIR WILLIAM & CO/IL
    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 25,573 shares
    Change vs previous 13F -232 shares

    0.03% of the 13F portfolio, value $12,184,912.

    13F-HR 0001104659-25-109927 filed by BLAIR WILLIAM & CO/IL
    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 25,805 shares
    Change vs previous 13F -17,940 shares

    0.04% of the 13F portfolio, value $12,943,641.

    13F-HR 0001104659-25-070274 filed by BLAIR WILLIAM & CO/IL
    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 43,745 shares
    Change vs previous 13F -1,325 shares

    0.06% of the 13F portfolio, value $20,371,511.

    13F-HR 0001104659-25-046545 filed by BLAIR WILLIAM & CO/IL
    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 45,070 shares
    Change vs previous 13F -1,867 shares

    0.06% of the 13F portfolio, value $21,334,750.

    13F-HR 0001104659-25-011872 filed by BLAIR WILLIAM & CO/IL
    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 46,937 shares
    Change vs previous 13F not available

    0.07% of the 13F portfolio, value $22,275,858.

    13F-HR 0001104659-24-116499 filed by BLAIR WILLIAM & CO/IL
    Filed (acceptance time not in the bulk data set), ingested

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