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Disclosery

Flagship Pioneering, LLC: MRNA position timeline

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

Flagship Pioneering, LLC held 4,632,149 MRNA 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 4,632,149 shares
    Change vs previous 13F 0 shares

    21.07% of the 13F portfolio, value $324,389,395.

    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 4,632,149 shares
    Change vs previous 13F 0 shares

    20.26% of the 13F portfolio, value $235,313,169.

    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 4,632,149 shares
    Change vs previous 13F 0 shares

    42.16% of the 13F portfolio, value $136,602,075.

    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 4,632,149 shares
    Change vs previous 13F 0 shares

    40.89% of the 13F portfolio, value $119,648,409.

    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 4,632,149 shares
    Change vs previous 13F 0 shares

    47.6% of the 13F portfolio, value $127,800,991.

    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).

  6. period ended2025-03-31
    13F 4,632,149 shares
    Change vs previous 13F 0 shares

    55.7% of the 13F portfolio, value $131,321,424.

    13F-HR 0000950123-25-005707 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).

  7. period ended2024-12-31
    13F 4,632,149 shares
    Change vs previous 13F 0 shares

    57.63% of the 13F portfolio, value $192,604,755.

    13F-HR 0000950123-25-002708 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).

  8. period ended2024-09-30
    13F 4,632,149 shares
    Change vs previous 13F not available

    52.3% of the 13F portfolio, value $309,566,518.

    13F-HR 0000950123-24-011756 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).