# Flagship Pioneering, LLC: Form 13F holdings

An institutional investment manager in CAMBRIDGE, MA. SEC CIK 1400240.

- Quarter ended: 2026-06-30
- Filed: 2026-08-14
- Reported value: $1.54bn
- Positions: 5 (7 lines in the filing's table; lines for the same security and option type are added together here)
- Compared with: the 13F for the quarter ended 2026-03-31
- Filing: https://www.sec.gov/Archives/edgar/data/1400240/000119312526352122/

## Holdings

As filed, largest first. Reported value is what the manager stated at the quarter end (Jun 30, 2026), in US dollars; it is filing data, not a price. Weight is the share of the total reported value.

| Issuer | Class | Reported value | Weight | Shares | Put or call | Change on the quarter before |
| --- | --- | ---: | ---: | ---: | --- | --- |
| [GENERATE BIOMEDICINES INC (GENB)](/companies/genb.md) | COM SHS | $1.06bn | 68.7% | 62,673,117 |  | Unchanged |
| [MODERNA INC (MRNA)](/companies/mrna.md) | COM | $324.4m | 21.1% | 4,632,149 |  | Unchanged |
| [SANA BIOTECHNOLOGY INC (SANA)](/companies/sana.md) | COM | $87.3m | 5.7% | 25,001,856 |  | Unchanged |
| [FOGHORN THERAPEUTICS INC (FHTX)](/companies/fhtx.md) | COM | $61.8m | 4.0% | 12,674,120 |  | Unchanged |
| [SERES THERAPEUTICS INC (MCRB)](/companies/mcrb.md) | COM NEW | $9.1m | 0.6% | 1,155,850 |  | Unchanged |

Source: SEC EDGAR, Form 13F-HR, accession 0001193125-26-352122. Last ingested by Listed: Oct 22, 2026, 05:26 ET. No prices; not investment advice.