Filer Snapshot

Flagship Pioneering, LLC SEC EDGAR Filings

SEC filings, ownership reports, and insider transactions for CIK 0001400240.

Entity Type

Company

Total Filings

92

Latest Filing

02 Mar 2026

Industry

n/a

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Go to latest filings table Open reporting owner context
Source: SEC Forms 3/4/5

4 filed on 02 Mar 2026 for CIK 0001400240.

View Source Filing
Notable people
Ph.D. Noubar B. Afeyan
Business address
55 Cambridge Parkway, Suite 800 E, Cambridge, MA, 02142
Top holdings (ownership)
OMGA, SANA, FHTX, and AXLA
Top securities (13F)
MRNA, SANA, FHTX, and MCRB
State of incorporation
DE
Former names
Flagship Pioneering Inc. (to 11 Dec 2025), Flagship Ventures Management, Inc. (to 14 Nov 2016)

Quick Takeaways

  • Flagship Pioneering, LLC is an SEC filer tracked under CIK 0001400240.
  • 92 filings are listed on this profile.
  • Common form coverage includes 4, 3, 13F-HR and more.

What Changed

  • Latest filing: 4 filed on 02 Mar 2026.
  • Report period: 26 Feb 2026.

Why This Matters

  • You can quote filing dates and form types directly from the SEC record on this page.
  • Use this profile before deeper ownership or insider analysis to confirm filing history context.

Source Evidence

Source: SEC Forms 3/4/5

4 filed on 02 Mar 2026 for CIK 0001400240.

View Source Filing

Return Loop

Why revisit this filer page

A newly filed 4 can change the filing history, ownership context, or next research path for Flagship Pioneering, LLC.

Latest source-backed update
4 filed 02 Mar 2026
Why come back
Revisit after a new SEC filing appears to compare the updated record with prior filings.
  • Latest filing on record: 4 filed 02 Mar 2026.
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Filer freshness comes from SEC EDGAR submission history and related source-backed ownership or portfolio filings when available.

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Latest update

What changed recently for Flagship Pioneering, LLC

New filing available

Latest 13F period: Q4 2025. Open the source-backed page to inspect the fresh filing or facts context.

Update date

17 Feb 2026

Page type

Filer profile

Latest period

Q4 2025

Institutional portfolio context was refreshed from a 13F filing filed on 17 Feb 2026.

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Benchmark Context

Benchmark context for this company

Flagship Pioneering, LLC has a source-backed company facts view where you can compare the latest reported metrics with its own recent history and with peer rankings for the same metric.

Compared with

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Why this is notable

Latest 13F period: Q4 2025. That gives you a fresh baseline before you compare this company with peers.

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Filer Overview

Flagship Pioneering, LLC has filed 92 SEC EDGAR filings since 24 May 2007. Common forms include 4, 3, 13F-HR, 144 and more.

Reporting owner transactions Latest 13F filings

Latest Filings

Recent SEC filings for Flagship Pioneering, LLC with direct links to document and filing folders.

Form type Document Filing Description Filing date Reporting date File number(s)
4 Open 4 document View SEC filing for 4 4 02 Mar 2026 26 Feb 2026 001-43165
3 Open 3 document View SEC filing for 3 3 26 Feb 2026 26 Feb 2026 001-43165
13F-HR Open 13F-HR document View SEC filing for 13F-HR 17 Feb 2026 31 Dec 2025 028-17559
4 Open 4 document View SEC filing for 4 4 15 Jan 2026 13 Jan 2026 001-39634
144 Open 144 document View SEC filing for 144 11 Dec 2025
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2025 30 Sep 2025 028-17559
N-PX Open N-PX document View SEC filing for N-PX 02 Sep 2025 30 Jun 2025 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2025 30 Jun 2025 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2025 31 Mar 2025 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2025 31 Dec 2024 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2024 30 Sep 2024 028-17559
N-PX Open N-PX document View SEC filing for N-PX 03 Sep 2024 30 Jun 2024 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2024 30 Jun 2024 028-17559
4 Open 4 document View SEC filing for 4 4 24 May 2024 22 May 2024 001-39634
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2024 31 Mar 2024 028-17559
4 Open 4 document View SEC filing for 4 4 14 Feb 2024 12 Feb 2024 001-39941
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2024 31 Dec 2023 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2023 30 Sep 2023 028-17559
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 15 Sep 2023 13 Sep 2023 001-39941
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 15 Aug 2023 11 Aug 2023 001-39746
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2023 30 Jun 2023 028-17559
4 Open 4 document View SEC filing for 4 4 13 Jul 2023 11 Jul 2023 001-38473
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2023 31 Mar 2023 028-17559
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 27 Feb 2023 27 Feb 2023 001-40657
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2023 31 Dec 2022 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2022 30 Sep 2022 028-17559
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 17 Oct 2022 13 Oct 2022 001-38901
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 Aug 2022 30 Jun 2022 028-17559
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 07 Jul 2022 05 Jul 2022 001-37465
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 01 Jun 2022 27 May 2022 001-38473
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 May 2022 31 Mar 2022 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2022 31 Dec 2021 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 Nov 2021 30 Sep 2021 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 Aug 2021 30 Jun 2021 028-17559
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 05 Aug 2021 03 Aug 2021 001-40657
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 05 Aug 2021 03 Aug 2021 001-40657
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 29 Jul 2021 29 Jul 2021 001-40657
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 29 Jul 2021 29 Jul 2021 001-40657
13F-HR Open 13F-HR document View SEC filing for 13F-HR 17 May 2021 31 Mar 2021 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 Feb 2021 31 Dec 2020 028-17559
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 10 Feb 2021 08 Feb 2021 001-39941
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 03 Feb 2021 03 Feb 2021 001-39941
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 10 Dec 2020 08 Dec 2020 001-39746
3 Open 3 document View SEC filing for 3 3 03 Dec 2020 03 Dec 2020 001-39746
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 25 Nov 2020 23 Nov 2020 001-37465
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 Nov 2020 30 Sep 2020 028-17559
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 29 Oct 2020 27 Oct 2020 001-39634
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 22 Oct 2020 22 Oct 2020 001-39634
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 13 Oct 2020 13 Oct 2020 001-39615
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13 Aug 2020 30 Jun 2020 028-17559
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 01 Jul 2020 29 Jun 2020 001-38473
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 May 2020 31 Mar 2020 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13 Feb 2020 31 Dec 2019 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2019 30 Sep 2019 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13 Aug 2019 30 Jun 2019 028-17559
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 28 Jun 2019 18 Jun 2019 001-37465
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 May 2019 31 Mar 2019 028-17559
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 06 Mar 2019 04 Mar 2019 001-38822
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 27 Feb 2019 27 Feb 2019 001-38822
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13 Feb 2019 31 Dec 2018 028-17559
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 13 Dec 2018 11 Dec 2018 001-38753
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 07 Dec 2018 07 Dec 2018 001-38753
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13 Nov 2018 30 Sep 2018 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 07 Aug 2018 30 Jun 2018 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2018 31 Mar 2018 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2018 31 Dec 2017 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 03 Nov 2017 30 Sep 2017 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 02 Aug 2017 30 Jun 2017 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 10 May 2017 31 Mar 2017 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13 Feb 2017 31 Dec 2016 028-17559
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2016 30 Sep 2016 028-17559
4 Open 4 document View SEC filing for 4 FORM 4 - NOUBAR AFEYAN - AGTC 2 29 Jul 2015 27 Jul 2015 001-33827
4 Open 4 document View SEC filing for 4 FORM 4 - NOUBAR AFEYAN - AGTC 1 29 Jul 2015 27 Jul 2015 001-33827
4 Open 4 document View SEC filing for 4 FORM 4 16 Jul 2015 14 Jul 2015 001-33827
4 Open 4 document View SEC filing for 4 FORM 4 - NOUBAR AFEYAN - FLAGSHIP 4 05 Dec 2014 03 Dec 2014 001-33827
4 Open 4 document View SEC filing for 4 FORM 4 - NOUBAR AFEYAN - FLAGSHIP 3 05 Dec 2014 03 Dec 2014 001-33827
4 Open 4 document View SEC filing for 4 FORM 4 - NOUBAR AFEYAN - FLAGSHIP 2 05 Dec 2014 03 Dec 2014 001-33827
4 Open 4 document View SEC filing for 4 FORM 4 - NOUBAR AFEYAN - FLAGSHIP 1 05 Dec 2014 03 Dec 2014 001-33827
3 Open 3 document View SEC filing for 3 FORM 3 - 18 Sep 2013 18 Sep 2013 001-36065
4 Open 4 document View SEC filing for 4 FORM 4 - FLAGSHIP 01 Feb 2013 30 Jan 2013 001-33827
4 Open 4 document View SEC filing for 4 FORM 4 - FLAGSHIP 22 Aug 2012 20 Aug 2012 001-33827
4 Open 4 document View SEC filing for 4 FORM 4 - FLAGSHIP 23 May 2012 21 May 2012 001-33827
4 Open 4 document View SEC filing for 4 FORM 4 - FLAGSHIP 20 Sep 2011 19 Sep 2011 001-33827
4 Open 4 document View SEC filing for 4 FORM 4 - FLAGSHIP (A) 11 Feb 2011 09 Feb 2011 001-33827
3 Open 3 document View SEC filing for 3 FORM 3 - FLAGSHIP A (NOUBAR AFEYAN) 03 Feb 2011 03 Feb 2011 001-33827

About this filer

Flagship Pioneering, LLC files with the SEC under CIK 0001400240. This page aggregates EDGAR filings and related ownership activity.

FAQ

What is a CIK?
A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.
Why are some filings missing?
New filings appear as the SEC updates EDGAR, and older records can vary by availability.
How often is this page updated?
Updates follow new EDGAR submissions and periodic data refreshes.
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