Flagship Ventures Management, Inc.

10% owner at HELICOS BIOSCIENCES CORP · on record since May 31, 2007
10% owner at Generate Biomedicines, Inc. · on record since Feb 26, 2026
Director at HELICOS BIOSCIENCES CORP · on record since Dec 29, 2008
Director at Foghorn Therapeutics Inc. · on record since Jan 15, 2026
10% owner at BG Medicine, Inc. · on record since Feb 11, 2011
10% owner at ACCELERON PHARMA INC · on record since Sep 18, 2013
10% owner at AGRICULTURAL EQUIPMENT CORP · on record since Dec 13, 2018
10% owner at Kaleido Biosciences, Inc. · on record since Feb 27, 2019
10% owner at Seres Therapeutics, Inc. · on record since Jun 28, 2019
10% owner at CD INTERNATIONAL ENTERPRISES, INC. · on record since Jul 1, 2020
10% owner at Foghorn Therapeutics Inc. · on record since Oct 29, 2020
10% owner at Codiak BioSciences, Inc. · on record since Oct 13, 2020
10% owner at Sigilon Therapeutics, Inc. · on record since Dec 10, 2020
Director at Omega Therapeutics, Inc. · on record since Jul 29, 2021
10% owner at Omega Therapeutics, Inc. · on record since Jul 29, 2021
10% owner at Sana Biotechnology, Inc. · on record since Feb 10, 2021
10% owner at Axcella Health Inc. · on record since Oct 17, 2022

Insider trading activity of Flagship Ventures Management, Inc.

Transactions on record: 72; since May 23, 2012

Open-market buys: 5; $39.2M

Open-market sells: 16; $1.4K

Companies traded: 2; last filing Feb 27, 2023

Figures computed from official regulatory filings — .

Companies where Flagship Ventures Management, Inc. has traded

22 tx · $39.2M · Feb 27, 2023
50 tx · $2.7K · Jul 29, 2015

Track record of Flagship Ventures Management, Inc.

Open-market buys: 5

Last buy: Feb 27, 2023

Enough buys on record, but none of them has a 63-day return yet — this happens when the shares stopped trading, or when the buys are too recent. Win rates will appear once returns mature.

Transaction history of Flagship Ventures Management, Inc.

Co-insiders of Flagship Ventures Management, Inc.

This page republishes public regulatory disclosures.

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
Omega Therapeutics, Inc.Listing unverified	Feb 27, 2023	Buy	1,329,324	5.78 USD	$7.7M	conv 36First in 12mo	SEC
Omega Therapeutics, Inc.Listing unverified	Feb 27, 2023	Buy	1,993,986	5.78 USD	$11.5M	conv 48First in 12mo	SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Other	1,323,529	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-1,666,667	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Buy	661,764	17.00 USD	$11.2M	conv 55ClusterFirst in 12mo	SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-1,666,666	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-13,333,333	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-2,666,667	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Other	8,396,825	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Buy	294,117	17.00 USD	$5M	conv 59ClusterFirst in 12mo	SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Other	970,588	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-22,275,232	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-27,388,000	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-3,333,333	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-3,000,000	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Buy	220,588	17.00 USD	$3.7M	conv 50ClusterFirst in 12mo	SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Other	1,088,470	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-4,112,000	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-5,000,000	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Other	4,852,943	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Other	5,896,386	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-666,667	—	n/a (No price was disclosed in the filing)		SEC
BG Medicine, Inc.Listing on record	Jul 29, 2015	Other	254	0.14 USD	$35.6		SEC
BG Medicine, Inc.Listing on record	Jul 29, 2015	OtherD (derivative)	-254	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
BG Medicine, Inc.Listing on record	Jul 29, 2015	OtherD (derivative)	-508	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
Omega Therapeutics, Inc.Listing unverified	Feb 27, 2023	Buy	1,329,324	5.78 USD	$7.7M	conv 36First in 12mo	SEC
Omega Therapeutics, Inc.Listing unverified	Feb 27, 2023	Buy	1,993,986	5.78 USD	$11.5M	conv 48First in 12mo	SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Other	1,323,529	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-1,666,667	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Buy	661,764	17.00 USD	$11.2M	conv 55ClusterFirst in 12mo	SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-1,666,666	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-13,333,333	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-2,666,667	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Other	8,396,825	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Buy	294,117	17.00 USD	$5M	conv 59ClusterFirst in 12mo	SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Other	970,588	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-22,275,232	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-27,388,000	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-3,333,333	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-3,000,000	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Buy	220,588	17.00 USD	$3.7M	conv 50ClusterFirst in 12mo	SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Other	1,088,470	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-4,112,000	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-5,000,000	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Other	4,852,943	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	Other	5,896,386	—	n/a (No price was disclosed in the filing)		SEC
Omega Therapeutics, Inc.Listing unverified	Aug 5, 2021	OtherD (derivative)	-666,667	—	n/a (No price was disclosed in the filing)		SEC
BG Medicine, Inc.Listing on record	Jul 29, 2015	Other	254	0.14 USD	$35.6		SEC
BG Medicine, Inc.Listing on record	Jul 29, 2015	OtherD (derivative)	-254	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
BG Medicine, Inc.Listing on record	Jul 29, 2015	OtherD (derivative)	-508	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC