X0306 4 2022-08-19 0 0001564406 Oak Street Health, Inc. OSH 0001782866 Newlight Partners LP 320 PARK AVENUE NEW YORK NY 10022 1 0 1 0 0001820000 Newlight Harbour Point SPV LLC C/O NEWLIGHT PARTNERS LP 320 PARK AVENUE NEW YORK NY 10022 0 0 1 0 0001782873 Newlight GP LLC C/O NEWLIGHT PARTNERS LP 320 PARK AVENUE NEW YORK NY 10022 0 0 1 0 0001782860 Yadav Ravi C/O NEWLIGHT PARTNERS LP 320 PARK AVENUE NEW YORK NY 10022 0 0 1 0 0001233188 WASSONG DAVID C/O NEWLIGHT PARTNERS LP 320 PARK AVENUE NEW YORK NY 10022 0 0 1 0 Common Stock, par value $0.001 2022-08-19 4 S 0 7000000 24.72 D 33509640 I See Footnote This amount represents a public offering price of $25.75 per share of common stock, par value $0.001 per share (the "Common Stock"), of Oak Street Health, Inc. (the "Company"), less an underwriting discount of $1.03 per share for shares sold in an underwritten public offering. Represents shares held directly by Newlight Harbour Point SPV LLC ("SPV"). Newlight Partners LP controls SPV and serves as the exclusive investment manager to its client in respect of shares held by SPV. The general partner of Newlight Partners LP is Newlight GP LLC. The sole members of Newlight GP LLC are Ravi Yadav and David Wassong. The Reporting Persons may be deemed to be directors-by-deputization for the purpose of Section 16 of the Securities Exchange Act of 1934 as a result of the service of Srdjan Vukovic on the Board of Directors of the Company because Mr. Vukovic is an employee of Newlight Partners LP or one of its affiliates. Each of Newlight Partners LP, Newlight GP LLC, Ravi Yadav and David Wassong disclaims beneficial ownership of the shares of Common Stock of the Company, except to the extent of its pecuniary interest therein, and the inclusion of the Common Stock in any Section 16 report by such Reporting Persons shall not be deemed to be an admission of beneficial ownership of the Common Stock for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise. 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. Newlight Harbour Point SPV LLC, /s/ David Taylor, as attorney-in-fact 2022-08-19 Newlight Partners LP, By: Newlight GP LLC, its general partner, /s/ David Taylor, as attorney-in-fact 2022-08-19 Newlight GP LLC, /s/ David Taylor, as attorney-in-fact 2022-08-19 /s/ David Taylor, as attorney-in-fact for Ravi Yadav 2022-08-19 /s/ David Taylor, as attorney-in-fact for David Wassong 2022-08-19