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Disclosery

WILLIAM JOHN SEMPOLINSKI: MU position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of WILLIAM JOHN SEMPOLINSKI on MU, newest first. How the timeline and the estimate are built.

WILLIAM JOHN SEMPOLINSKI held 830 MU shares at 2026-06-30 per its 13F-HR filed 2026-08-14.

the latest 13F is the newest step

  1. period ended2026-06-30
    13F 830 shares
    Change vs previous 13F +70 shares

    0.39% of the 13F portfolio, value $958,061.

    13F-HR 0001951757-26-001260 filed by WILLIAM JOHN SEMPOLINSKI
    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 760 shares
    Change vs previous 13F not available

    0.13% of the 13F portfolio, value $256,758.

    13F-HR 0001951757-26-001607 filed by WILLIAM JOHN SEMPOLINSKI
    Filed (acceptance time not in the bulk data set), ingested

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