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Disclosery

Flagship Ventures Fund IV General Partner LLC

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13F filer, CIK 1508051, CAMBRIDGE, MA

Flagship Ventures Fund IV General Partner LLC filed a 13F-NT notice for the quarter ended 2026-06-30 on 2026-08-14.

Filed (acceptance time not in the bulk data set), ingested 13F-NT 0001193125-26-352123

This filer reports no holdings of its own for Q2 2026. It filed a 13F-NT notice, and its holdings are in the report of . How notices are handled.

Changes against Q1 2026 are not shown: it was a notice, with the holdings in another manager's report (0 positions on file), so every position would read as new.

Part of the filer group Flagship Pioneering, LLC

How groups are built

How Q2 2026 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-NT 0001193125-26-352123 notice2026-08-14acceptance time not in the bulk data set

Filings

Every filing of this filer: 13F reports and notices, the 13D and 13G it filed or is a reporting person of, and Forms 3, 4 and 5 it reported as an owner.

FilingSubjectFiledAcceptedIngested
13F-NT 0001193125-26-352123 Quarter ended 2026-06-302026-08-14acceptance time not in the bulk data set
13F-NT 0001193125-26-226585 Quarter ended 2026-03-312026-05-15acceptance time not in the bulk data set
13F-NT 0001193125-26-054541 Quarter ended 2025-12-312026-02-17acceptance time not in the bulk data set
13F-NT 0001193125-25-282861 Quarter ended 2025-09-302025-11-14acceptance time not in the bulk data set
13F-NT 0000950123-25-008303 Quarter ended 2025-06-302025-08-14acceptance time not in the bulk data set
13F-NT 0000950123-25-005751 Quarter ended 2025-03-312025-05-15acceptance time not in the bulk data set
13F-NT 0000950123-25-002713 Quarter ended 2024-12-312025-02-14acceptance time not in the bulk data set
13F-NT 0000950123-24-011761 Quarter ended 2024-09-302024-11-14acceptance time not in the bulk data set
13F-NT 0000950123-24-008726 Quarter ended 2024-06-302024-08-14acceptance time not in the bulk data set
13F-NT 0000950123-24-005590 Quarter ended 2024-03-312024-05-15acceptance time not in the bulk data set
13F-NT 0000950123-24-002506 Quarter ended 2023-12-312024-02-14acceptance time not in the bulk data set
13F-NT 0000950123-23-010818 Quarter ended 2023-09-302023-11-14acceptance time not in the bulk data set
13F-NT 0000950123-23-008066 Quarter ended 2023-06-302023-08-14acceptance time not in the bulk data set
13F-NT 0000950123-23-005261 Quarter ended 2023-03-312023-05-15acceptance time not in the bulk data set
13F-NT 0000950123-23-002462 Quarter ended 2022-12-312023-02-14acceptance time not in the bulk data set
13F-NT 0000950123-22-012253 Quarter ended 2022-09-302022-11-14acceptance time not in the bulk data set
13F-NT 0000950123-22-009424 Quarter ended 2022-06-302022-08-15acceptance time not in the bulk data set
13F-NT 0000950123-22-006304 Quarter ended 2022-03-312022-05-16acceptance time not in the bulk data set
13F-NT 0000950123-22-002900 Quarter ended 2021-12-312022-02-14acceptance time not in the bulk data set
13F-NT 0000950123-21-015490 Quarter ended 2021-09-302021-11-15acceptance time not in the bulk data set
13F-NT 0000950123-21-011118 Quarter ended 2021-06-302021-08-16acceptance time not in the bulk data set
13F-NT 0000950123-21-007074 Quarter ended 2021-03-312021-05-17acceptance time not in the bulk data set
13F-NT 0000950123-21-002931 Quarter ended 2020-12-312021-02-16acceptance time not in the bulk data set
13F-NT 0000950123-20-012137 Quarter ended 2020-09-302020-11-16acceptance time not in the bulk data set
13F-NT 0000950123-20-008655 Quarter ended 2020-06-302020-08-13acceptance time not in the bulk data set
13F-NT 0000950123-20-004934 Quarter ended 2020-03-312020-05-14acceptance time not in the bulk data set
13F-NT 0000950123-20-001883 Quarter ended 2019-12-312020-02-13acceptance time not in the bulk data set
13F-NT 0000950123-19-011395 Quarter ended 2019-09-302019-11-14acceptance time not in the bulk data set
13F-NT 0000950123-19-007820 Quarter ended 2019-06-302019-08-13acceptance time not in the bulk data set
13F-NT 0001012975-19-000348 Quarter ended 2019-03-312019-05-14acceptance time not in the bulk data set
13F-NT 0001012975-19-000146 Quarter ended 2018-12-312019-02-13acceptance time not in the bulk data set
13F-NT 0001012975-18-001203 Quarter ended 2018-09-302018-11-13acceptance time not in the bulk data set
13F-NT 0001012975-18-000954 Quarter ended 2018-06-302018-08-07acceptance time not in the bulk data set
13F-NT 0001012975-18-000417 Quarter ended 2018-03-312018-05-15acceptance time not in the bulk data set
13F-NT 0001012975-18-000162 Quarter ended 2017-12-312018-02-14acceptance time not in the bulk data set
13F-NT 0001012975-17-000808 Quarter ended 2017-09-302017-11-03acceptance time not in the bulk data set
13F-NT 0001012975-17-000580 Quarter ended 2017-06-302017-08-02acceptance time not in the bulk data set
13F-NT 0001012975-17-000379 Quarter ended 2017-03-312017-05-10acceptance time not in the bulk data set
13F-NT 0001012975-17-000115 Quarter ended 2016-12-312017-02-13acceptance time not in the bulk data set
13F-NT 0001012975-16-001567 Quarter ended 2016-09-302016-11-14acceptance time not in the bulk data set
13F-HR 0001012975-16-001432 Quarter ended 2016-06-302016-08-15acceptance time not in the bulk data set
13F-NT 0000950123-16-017859 Quarter ended 2016-03-312016-06-03acceptance time not in the bulk data set
13F-HR 0001012975-16-001005 Quarter ended 2015-12-312016-02-12acceptance time not in the bulk data set