X0306 4 2022-09-15 0 0001659352 Codiak BioSciences, Inc. CDAK 0001724575 Flagship Ventures Fund V General Partner LLC 55 CAMBRIDGE PARKWAY, SUITE 800E CAMBRIDGE MA 02142 0 0 1 0 0001627639 Flagship Ventures Fund V, L.P. 55 CAMBRIDGE PARKWAY, SUITE 800E CAMBRIDGE MA 02142 0 0 1 0 0001724939 Flagship V VentureLabs Rx Fund, L.P. 55 CAMBRIDGE PARKWAY, SUITE 800E CAMBRIDGE MA 02142 0 0 1 0 0001222012 AFEYAN NOUBAR 55 CAMBRIDGE PARKWAY, SUITE 800E CAMBRIDGE MA 02142 0 0 1 0 Common Stock 2022-09-15 4 P 0 722590 A 1865767 I By Flagship Ventures Fund V, L.P. Common Stock 2022-09-15 4 P 0 210743 A 1188920 I By Flagship V VentureLabs Rx Fund, L.P. Common Stock 485949 I Flagship VentureLabs V LLC Warrants to purchase Common Stock 1.875 2022-09-15 4 P 0 722590 A 2022-09-15 2027-09-15 Common Stock 722590 722590 I By Flagship Ventures Fund V, L.P. Warrants to purchase Common Stock 1.875 2022-09-15 4 P 0 210743 A 2022-09-15 2027-09-15 Common Stock 210743 210743 I By Flagship V VentureLabs Rx Fund, L.P. On September 15, 2022, pursuant to an underwritten public offering by the Issuer (the "Offering"), Flagship Ventures Fund V, L.P. ("Flagship Fund V") acquired 722,590 shares of Common Stock and accompanying warrants to purchase 722,590 shares of Common Stock, and Flagship V VentureLabs Rx Fund, L.P. ("Flagship Fund V Rx") acquired 210,743 shares of Common Stock and accompanying warrants to purchase 210,743 shares of Common Stock. The combined purchase price in the Offering was $1.50 per share of Common Stock and accompanying warrant. Shares held by Flagship Fund V. Flagship Ventures Fund V General Partner LLC ("Flagship V GP") is the general partner of Flagship Fund V. Noubar B. Afeyan, Ph.D. is the sole manager of Flagship V GP. Each of the reporting persons except for Flagship Fund V disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein. Shares held by Flagship Fund V Rx. Flagship V GP is the general partner of Flagship Fund V Rx. Noubar B. Afeyan, Ph.D. is the sole manager of Flagship V GP. Each of the reporting persons except for Flagship Fund V Rx disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein. Shares held by Flagship VentureLabs V LLC ("VentureLabs V"). Flagship VentureLabs V Manager LLC ("VentureLabs V Manager") is the manager of VentureLabs V. Flagship Pioneering, Inc. ("Flagship Pioneering") is the manager of VentureLabs V Manager. Noubar B. Afeyan, Ph.D. is the CEO and sole stockholder of Flagship Pioneering. Each of the reporting persons except for VentureLabs V disclaims beneficial ownership of such shares except to the extent of his or its pecuniary interest therein. Flagship Ventures Fund V General Partner LLC, By: /s/ Noubar B. Afeyan, Name: Noubar B. Afeyan, Ph.D., Title: Manager 2022-09-16 Flagship Ventures Fund V, L.P., By: Flagship Ventures Fund V General Partner LLC, its general partner, By: /s/ Noubar B. Afeyan, Name: Noubar B. Afeyan, Ph.D., Title: Manager 2022-09-16 Flagship V VentureLabs Rx Fund, L.P., By: Flagship Ventures Fund V General Partner LLC, its general partner, By: /s/ Noubar B. Afeyan, Name: Noubar B. Afeyan, Ph.D., Title: Manager 2022-09-16 Noubar B. Afeyan, Ph.D., By: /s/ Noubar B. Afeyan, Ph.D. 2022-09-16