As Of	Filer	Filing¹	For·On·As	Docs:Size	Issuer		Filing Agent

 2/27/23  Afeyan Noubar                     4          Dir.,%Own.² 1:17K  Omega Therapeutics, Inc.          Donnelley Fin’l S… 06/FA 
          Flagship Pioneering Inc.
          Flagship Pioneering Special Opportunities Fd II Gen’l Part… LLC
          Flagship Pioneering Special Opportunities Fund II, L.P.
 2/27/23  Flagship Pioneering Fd VII, L.P.  3          10% Owner²  1:6K   Omega Therapeutics, Inc.          Donnelley Fin’l S… 06/FA 
          Flagship Pioneering Fund VII General Partner LLC
 2/27/23  Flagship Ventures Fund V, L.P.    SC 13D/A               2:318K Omega Therapeutics, Inc.          Donnelley … Solutions/FA 
          Flagship Pioneering Fund VI General Partner LLC³
          Flagship Pioneering Fund VI, L.P.³
          Flagship Pioneering Fund VII General Partner LLC³
          Flagship Pioneering Fund VII, L.P.³
          Flagship Pioneering Special Opportunities Fd II Gen’l P… LLC³
          Flagship Pioneering Special Opportunities Fund II, L.P.³
          Flagship Pioneering, Inc.³
          Flagship V Venturelabs RX Fund, L.P.³
          Flagship Venturelabs V, LLC³
          Flagship Ventures Fund V General Partner LLC³
          FPN General Partner LLC³
          FPN, L.P.³
          Noubar Afeyan³
          Nutritional Health LTP Fund General Partner LLC³
          Nutritional Health LTP Fund, L.P.³
          Venturelabs V Manager LLC³

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¹	Filing/Form Types:  -K
	3	Initial Statement of Beneficial Ownership of Securities by an Insider — Form 3 { The Filer is an Insider² of the Issuer }.
	4	Statement of Changes in Beneficial Ownership of Securities by an Insider — Form 4 { The Filer is an Insider² of the Issuer }.
	SC 13D	Statement of Acquisition of Beneficial Ownership by an “Active” Investor — Schedule 13D.
	/A	Amendment to, or Amended version of, a previous Filing of this Type.
²	Insider:  The Filer is a Director, Officer, 10% Owner and/or Other “insider” of the Issuer.
³	Group Member:  A Registrant or non-Registrant party to this Filing made by a Group.