Insider profile
Flagship Pioneering Inc. Insider Trading
This page tracks every SEC Form 4 filing since April 2023 by Flagship Pioneering Inc.: 36 transactions in total, including 9 open-market purchases and 0 sales. Each record is parsed directly from the original filing, with amendments reconciled so a corrected filing never double-counts.
- CIK
- 0001400240
- Companies traded
- 2
- Total filings
- 36
- First filing
- 2023-07-11
- Last filing
- 2026-03-02
Files as Flagship Pioneering Inc. · SEC EDGAR ↗
Activity summary
The most recent open-market decision, on March 2, 2026, was 3 purchases totaling 4,687,500 shares ($75.0M).
Three year balance
Buy and sell value by quarter, Q3 23 to Q1 26. Flagship Pioneering Inc. has been a net buyer across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $90.0M.
Insider insight
Flagship Pioneering Inc. trades most actively in GENB, accounting for 3 of the 36 filings on record. The largest single open-market purchase on record is $25.0M in GENB, filed Mar 2026.
Track record
Most active in
Transaction History
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Mar 2, 2026 | Flagship Pioneering Inc. | GENB | C | 2,953,586 | — | — |
| Mar 2, 2026 | Flagship Pioneering Inc. | GENB | C | 17,016,215 | — | — |
| Mar 2, 2026 | Flagship Pioneering Inc. | GENB | C | 1,265,822 | — | — |
| Mar 2, 2026 | Flagship Pioneering Inc. | GENB | C | 2,777,752 | — | — |
| Mar 2, 2026 | Flagship Pioneering Inc. | GENB | C | 2,109,704 | — | — |
31 more transactions hidden
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By number of filings.
Filing cadence
Filings per quarter, this window.
Busiest: Q1 26 (22 filings)
Quietest: Q4 23 (0 filings)
Reading an insider's Form 4 history
Corporate insiders (directors, officers, and holders of more than 10% of a company's stock) must report their trades to the SEC on Form 4 within two business days. Looking at one insider's filings over time shows whether they tend to buy on the open market (a discretionary use of their own money, generally the strongest signal), sell, or simply receive and exercise equity awards as compensation.
The track record above measures how this insider's past open-market purchases performed in the months after each filing. Trades made under a pre-scheduled Rule 10b5-1 plan are flagged because they carry no timing signal. To pull any insider's full history programmatically, see the insider trading API or our guide to reading Form 4 filings.