X0306 4 2020-08-05 0 0001564406 Oak Street Health, Inc. ?OSH? 0001683021 Kaushal Mohit C/O OAK STREET HEALTH, INC. 30 W. MONROE STREET, SUITE 1200 CHICAGO IL 60603 1 0 0 0 Common stock, $0.001 par value 2020-08-10 4 J 0 182690 0.00 A 182690 D Common stock, $0.001 par value 2020-08-10 4 A 0 9524 0.00 A 192214 D Employee Stock Options (Right to Buy) 21.00 2020-08-05 4 A 0 2612 0.00 A 2030-08-05 Common Stock, par value $0.001 2612 2612 D Employee Stock Options (Right to Buy) 21.00 2020-08-05 4 A 0 438 0.00 A 2030-08-05 Common Stock, par value $0.001 438 438 D Employee Stock Options (Right to Buy) 21.00 2020-08-05 4 A 0 3501 0.00 A 2030-08-05 Common Stock, par value $0.001 3501 3501 D These shares of common stock of Oak Street Health, Inc. (the "Issuer") were issued in connection with the closing of the Issuer's initial public offering on August 10, 2020 (the "Closing Date") in exchange for incentive units pursuant to the transactions contemplated by the Master Structuring Agreement dated August 10, 2020, by and among the Issuer, OSH Merger Sub 1, LLC, Quantum Strategic Partners Ltd., General Atlantic OSH Interholdco L.P., OSH Management Holdings, LLC ("Management Holdings"), Oak Street Health, LLC and Geoffrey Price dated August 10, 2020 (the "Organizational Transactions"). Represents shares of the Issuer's common stock, par value $0.001 (the "Shares") issued in exchange for vested and unvested incentive units in of Management Holdings in connection with the Organizational Transactions. The issuance of these securities was approved by the Issuer's board of directors under Rule 16b-3. Shares issued in exchange for the unvested incentive units were issued under the Oak Street Health Omnibus Incentive Plan (the "Plan"). Represents options issued under the Plan in exchange for vested incentive units in Management Holding in connection with the Organizational Transactions. These options are fully vested and exercisable. Represents options issued under the Plan in exchange for unvested time-vesting incentive units in Management Holdings in connection with the Organizational Transactions. These options will vest in two equal quarterly installments beginning on August 22, 2020. Represents options issued under the Plan in exchange for unvested performance-vesting incentive units in Management Holdings in connection with the Organizational Transactions. These options will cliff vest 100% on August 10, 2022. /s/ Robert Guenthner, as attorney-in-fact for Mohit Kaushal 2020-08-12