X0306 4 2022-03-30 1 0001623715 Imago BioSciences, Inc. IMGO 0001597143 Clarus Lifesciences III, L.P. C/O CLARUS VENTURES, LLC 101 MAIN STREET SUITE 1210 CAMBRIDGE MA 02142 0 0 1 0 0001620148 Clarus Ventures III GP, L.P. C/O CLARUS VENTURES 101 MAIN STREET, SUITE 1210 CAMBRIDGE MA 02142 0 0 1 0 0001762202 Blackstone Clarus III L.L.C. C/O BLACKSTONE INC. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001484870 Blackstone Holdings II L.P. C/O BLACKSTONE INC. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001464695 Blackstone Holdings I/II GP L.L.C. C/O BLACKSTONE INC. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001404071 Blackstone Group Management L.L.C. C/O BLACKSTONE INC. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001070844 SCHWARZMAN STEPHEN A C/O BLACKSTONE INC. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001393818 Blackstone Inc 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 Common Stock 2022-03-30 4 J 0 1000000 0.00 D 2375037 I See Footnotes Common Stock 61695 I See Footnotes Reflects a pro rata distribution of shares of Common Stock to the partners of Clarus Lifesciences III, L.P., including 237,051 shares of Common Stock which were distributed to Clarus Ventures III GP, L.P., its general partner, which distributed such 237,051 shares of Common Stock shares to its partners. Reflects securities held directly by Clarus Lifesciences III, L.P. Clarus Ventures III GP, L.P. is the general partner of Clarus Lifesciences III, L.P. Blackstone Clarus III L.L.C. is the general partner of Clarus Ventures III GP, L.P. The sole member of Blackstone Clarus III L.L.C. is Blackstone Holdings II L.P. Reflects securities held directly by an investment fund affiliated with Clarus Lifesciences III, L.P., which received 61,695 shares of Common Stock in the distribution described above. Such investment fund may be deemed to be indirectly controlled by Blackstone Holdings II L.P. The general partner of Blackstone Holdings II L.P. is Blackstone Holdings I/II GP L.L.C. The sole member of Blackstone Holdings I/II GP L.L.C. is Blackstone Inc. The sole holder of the Series II preferred stock of Blackstone Inc. is Blackstone Group Management L.L.C. Blackstone Group Management L.L.C. is wholly-owned by Blackstone's senior managing directors and controlled by its founder, Stephen A. Schwarzman. Information with respect to each of the Reporting Persons is given solely by such Reporting Person, and no Reporting Person has responsibility for the accuracy or completeness of information supplied by another Reporting Person. Each of the Reporting Persons (other than to the extent it directly holds securities reported herein) disclaims beneficial ownership of the securities held by the other Reporting Persons, except to the extent of such Reporting Person's pecuniary interest therein, and, pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, each of the Reporting Persons (other than to the extent it directly holds securities reported herein) states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose. CLARUS LIFESCIENCES III, L.P., By: Clarus Ventures III GP, L.P., its general partner, By: Blackstone Clarus III, L.L.C., its general partner, By: /s/ Omar Rehman, Name: Omar Rehman, Title: Chief Compliance Officer and Secretary 2022-04-01 CLARUS VENTURES III GP, L.P., By: Blackstone Clarus III, L.L.C., its general partner, By: /s/ Omar Rehman, Name: Omar Rehman, Title: Chief Compliance Officer and Secretary 2022-04-01 BLACKSTONE CLARUS III L.L.C., By: /s/ Omar Rehman, Name: Omar Rehman, Title: Chief Compliance Officer and Secretary 2022-04-01 BLACKSTONE HOLDINGS II L.P., By: Blackstone Holdings I/II GP L.L.C., its general partner, By: /s/ Tabea Hsi, Name: Tabea Hsi, Title: Senior Managing Director 2022-04-01 BLACKSTONE HOLDINGS I/II GP L.L.C., By: /s/ Tabea Hsi, Name: Tabea Hsi, Title: Senior Managing Director 2022-04-01 BLACKSTONE INC., By: /s/ Tabea Hsi, Name: Tabea Hsi, Title: Senior Managing Director 2022-04-01 BLACKSTONE GROUP MANAGEMENT L.L.C., By: /s/ Tabea Hsi, Name: Tabea Hsi, Title: Senior Managing Director 2022-04-01 /s/ Stephen A. Schwarzman 2022-04-01