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Flagship Pioneering, LLC: MCRB position timeline

Available 13F reports, 13D and 13G stakes and each Form 3, 4 and 5 line of Flagship Pioneering, LLC on MCRB, newest first. How the timeline and the estimate are built.

Flagship Pioneering, LLC held 1,155,850 MCRB 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 1,155,850 shares
    Change vs previous 13F 0 shares

    0.59% of the 13F portfolio, value $9,119,658.

    13F-HR 0001193125-26-352122 filed by Flagship Pioneering, LLC
    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 1,155,850 shares
    Change vs previous 13F 0 shares

    0.88% of the 13F portfolio, value $10,252,390.

    13F-HR 0001193125-26-226588 filed by Flagship Pioneering, LLC
    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 1,155,850 shares
    Change vs previous 13F 0 shares

    5.32% of the 13F portfolio, value $17,236,411.

    13F-HR 0001193125-26-054539 filed by Flagship Pioneering, LLC
    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 1,155,850 shares
    Change vs previous 13F 0 shares

    7.6% of the 13F portfolio, value $22,238,554.

    13F-HR 0001193125-25-282859 filed by Flagship Pioneering, LLC
    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 1,155,850 shares
    Change vs previous 13F not available

    4.78% of the 13F portfolio, value $12,841,492.

    13F-HR 0000950123-25-008304 filed by Flagship Pioneering, LLC
    Filed (acceptance time not in the bulk data set), ingested

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