Home

Flagship Pioneering Inc.

CIK 1400240 · last filed 2023-07-13

Flagship Pioneering Inc. is a corporate insider who has filed 6 SEC Form 4 insider transactions across 3 companies since 2008. The most recent filing, for MRNA, was dated May 21, 2026. Across all open-market trades the lifetime net is +$100.0M, making them a net buyer over the disclosed history.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

Loading insider history…
Disclosed Exposure

$0

Companies

3

Total Filings

6

Lifetime Open-Market Net

$100.00M

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
Evelo Biosciences, Inc. (EVLO) Delisted 10%+ Owner 274,766 $0.00 $27 $100.00M 1 2023-07-13
BG Medicine, Inc. (BGMD) Delisted 10%+ Owner 101,226 — — -$3.4K 2 2015-07-29
HELICOS BIOSCIENCES CORP (HLCS) Delisted 10%+ Owner — — — $0 1 2008-06-13

Recent Filings

6 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-05-21 MRNA Notice (144) −9,263 -$433.9K EDGAR
2025-12-11 MRNA Notice (144) −23,853 -$703.3K EDGAR
2023-07-13 Evelo Biosciences, Inc. (EVLO) Delisted Buy (P) +43,290,040 $100.00M EDGAR
2015-07-29 BG Medicine, Inc. (BGMD) Delisted Mixed +22,390 -$82 EDGAR
2011-09-20 BG Medicine, Inc. (BGMD) Delisted Other (J) −965,665 $0 EDGAR
2008-06-13 HELICOS BIOSCIENCES CORP (HLCS) Delisted Grant (A) — $0 EDGAR
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.