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BLAIR WILLIAM & CO/IL: MPWR position timeline

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

BLAIR WILLIAM & CO/IL held 30,259 MPWR 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 30,259 shares
    Change vs previous 13F -298 shares

    0.11% of the 13F portfolio, value $41,829,304.

    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 30,557 shares
    Change vs previous 13F +16,910 shares

    0.1% of the 13F portfolio, value $33,409,779.

    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 13,647 shares
    Change vs previous 13F +3,465 shares

    0.03% of the 13F portfolio, value $12,368,673.

    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 10,182 shares
    Change vs previous 13F +1,195 shares

    0.02% of the 13F portfolio, value $9,374,247.

    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 8,987 shares
    Change vs previous 13F -521 shares

    0.02% of the 13F portfolio, value $6,572,983.

    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 9,508 shares
    Change vs previous 13F -1,850 shares

    0.02% of the 13F portfolio, value $5,514,343.

    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 11,358 shares
    Change vs previous 13F +1,759 shares

    0.02% of the 13F portfolio, value $6,720,671.

    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 9,599 shares
    Change vs previous 13F not available

    0.03% of the 13F portfolio, value $8,874,160.

    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).