Oak Street Health 8K Announces Closing of Initial Public Offering and Full Exercise of the Underwriters’ Option to Purchase Additional Shares | OSH 11 Aug 20

Exhibit 1.1

Oak Street Health, Inc.

15,625,000 Shares of Common Stock

Underwriting Agreement

August 5, 2020

J.P. Morgan Securities LLC

Goldman Sachs & Co. LLC

As Representatives of the

several Underwriters listed

in Schedule 1 hereto

c/o J.P. Morgan Securities LLC

383 Madison Avenue

New York, New York 10179

c/o Goldman Sachs & Co. LLC

200 West Street

New York, NY 10282

Ladies and Gentlemen:

Oak Street Health, Inc., a Delaware corporation (the “Company”), proposes to issue and sell to the several underwriters listed in Schedule 1 hereto (the “Underwriters”), for whom you are acting as representatives (the “Representatives”), an aggregate of 15,625,000 shares of common stock, par value $0.001 per share, of the Company proposes to sell to the several Underwriters an aggregate of 15,625,000 shares of common stock of the Company (collectively, the “Underwritten Shares”). In addition, the Company proposes to issue and sell, at the option of the Underwriters, up to an additional 2,343,750 shares of common stock of the Company (the “Option Shares”). The Underwritten Shares and the Option Shares are herein referred to as the “Shares”. The shares of common stock of the Company to be outstanding after giving effect to the sale of the Shares are referred to herein as the “Stock”.

J.P. Morgan Securities LLC (the “Directed Share Underwriter”) has agreed to reserve a portion of the Shares to be purchased by it under this Agreement, up to 781,250 Shares, for sale to the Company’s directors, officers, and certain employees and other parties related to the Company (collectively, “Participants”), as set forth in the Prospectus (as hereinafter defined) under the heading “Underwriting” (the “Directed Share Program”). The Shares to be sold by the Directed Share Underwriter and its affiliates pursuant to the Directed Share Program are referred

to hereinafter as the “Directed Shares”. Any Directed Shares not orally confirmed for purchase by any Participant by 8:00 A.M., New York City time on the business day immediately following the date on which this Agreement is executed will be offered to the public by the Underwriters as set forth in the Prospectus.

In connection with the offering contemplated by this Agreement, the “Organizational Transactions” (as such term is defined in the Registration Statement and the Preliminary Prospectus (each as defined below) under the caption “Organizational Transactions”) were or will be effected, pursuant to which, among other things, the Company will become a holding company, its sole asset will be the equity of its wholly owned subsidiaries, including Oak Street Health, LLC, and it will operate and control all of the business and affairs and consolidate the financial results of Oak Street Health, LLC (the “LLC”). The Company and the LLC are each referred to herein as a “Oak Street Party” and, collectively, as the “Oak Street Parties”.

Each Oak Street Party hereby confirms its agreement with the several Underwriters concerning the purchase and sale of the Shares, as follows:

1. Registration Statement. The Company has prepared and filed with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended, and the rules and regulations of the Commission thereunder (collectively, the “Securities Act”), a registration statement (File No. 333-239818), including a prospectus, relating to the Shares. Such registration statement, as amended at the time it became effective, including the information, if any, deemed pursuant to Rule 430A or 430C under the Securities Act to be part of the registration statement at the time of its effectiveness (“Rule 430 Information”), is referred to herein as the “Registration Statement”; and as used herein, the term “Preliminary Prospectus” means each prospectus included in such registration statement (and any amendments thereto) before effectiveness, any prospectus filed with the Commission pursuant to Rule 424(a) under the Securities Act and the prospectus included in the Registration Statement at the time of its effectiveness that omits Rule 430 Information, and the term “Prospectus” means the prospectus in the form first used (or made available upon request of purchasers pursuant to Rule 173 under the Securities Act) in connection with confirmation of sales of the Shares. If the Company has filed an abbreviated registration statement pursuant to Rule 462(b) under the Securities Act (the “Rule 462 Registration Statement”), then any reference herein to the term “Registration Statement” shall be deemed to include such Rule 462 Registration Statement. Capitalized terms used but not defined herein shall have the meanings given to such terms in the Registration Statement and the Prospectus.

At or prior to the Applicable Time (as defined below), the Company had prepared the following information (collectively, with the pricing information set forth on Annex A, the “Pricing Disclosure Package”): a Preliminary Prospectus dated July 29, 2020 and each “free-writing prospectus” (as defined pursuant to Rule 405 under the Securities Act) listed on Annex A hereto.

“Applicable Time” means 5:30 P.M., New York City time, on August 5, 2020.

2. Purchase of the Shares. (a) The Company agrees to issue and sell the Underwritten Shares to the several Underwriters as provided in this underwriting agreement (this “Agreement”), and each Underwriter, on the basis of the representations, warranties and agreements set forth herein and subject to the conditions set forth herein, agrees, severally and not jointly, to purchase at a price per share of $19.74 (the “Purchase Price”) from the Company the respective number of Underwritten Shares set forth opposite such Underwriter’s name in Schedule 1 hereto.

In addition, the Company agrees to issue and sell the Option Shares to the several Underwriters as provided in this Agreement, and the Underwriters, on the basis of the representations, warranties and agreements set forth herein and subject to the conditions set forth herein, shall have the option to purchase from the Company the Option Shares at the Purchase Price less an amount per share equal to any dividends or distributions declared by the Company and payable on the Underwritten Shares but not payable on the Option Shares. If any Option Shares are to be purchased, the number of Option Shares to be purchased by each Underwriter shall be the number of Option Shares which bears the same ratio to the aggregate number of Option Shares being purchased as the number of Underwritten Shares set forth opposite the name of such Underwriter in Schedule 1 hereto (or such number increased as set forth in Section 10 hereof) bears to the aggregate number of Underwritten Shares being purchased from the Company by the several Underwriters, subject, however, to such adjustments to eliminate any fractional Shares as the Representatives in their sole discretion shall make.

The Underwriters may exercise the option to purchase Option Shares at any time in whole, or from time to time in part, on or before the thirtieth day following the date of the Prospectus, by written notice from the Representatives to the Company. Such notice shall set forth the aggregate number of Option Shares as to which the option is being exercised and the date and time when the Option Shares are to be delivered and paid for, which may be the same date and time as the Closing Date (as hereinafter defined) but shall not be earlier than the Closing Date nor later than the tenth full business day (as hereinafter defined) after the date of such notice (unless such time and date are postponed in accordance with the provisions of Section 10 hereof). Any such notice shall be given at least two business days prior to the date and time of delivery specified therein.

(b) The Company understands that the Underwriters intend to make a public offering of the Shares, and initially to offer the Shares on the terms set forth in the Pricing Disclosure Package. The Company acknowledges and agrees that the Underwriters may offer and sell Shares to or through any affiliate of an Underwriter.

(c) Payment for the Shares shall be made by wire transfer in immediately available funds to the accounts specified by the Company, to the Representatives in the case of the Underwritten Shares, at the offices of Davis Polk & Wardwell LLP at 10:00 A.M. New York City time on August 10, 2020, or at such other time or place on the same or such other date, not later than the fifth business day thereafter, as the Representatives and the Company may agree upon in writing or, in the case of the Option Shares, on the date and at the time and place specified by the Representatives in the written notice of the Underwriters’ election to purchase such Option Shares. The time and date of such payment for the Underwritten Shares is referred to herein as the “Closing Date”, and the time and date for such payment for the Option Shares, if other than the Closing Date, is herein referred to as the “Additional Closing Date.”

Payment for the Shares to be purchased on the Closing Date or the Additional Closing Date, as the case may be, shall be made against delivery to the Representatives for the respective accounts of the several Underwriters of the Shares to be purchased on such date in book entry form registered in such names and in such denominations as the Representatives shall request in writing not later than two full business days prior to the Closing Date or the Additional Closing Date, as the case may be, with any transfer taxes payable in connection with the sale of such Shares duly paid by the Company. Delivery of the Shares shall be made through the facilities of The Depository Trust Company (“DTC”) unless the Representatives shall otherwise instruct.

Each of the Oak Street Parties acknowledges and agrees that the Representatives and the other Underwriters are acting solely in the capacity of an arm’s length contractual counterparty to the Oak Street Parties with respect to the offering of Shares contemplated hereby (including in connection with determining the terms of the offering) and not as a financial advisor or a fiduciary to, or an agent of, the Oak Street Parties or any other person. Additionally, neither the Representatives nor any other Underwriter is advising the Oak Street Parties or any other person as to any legal, tax, investment, accounting or regulatory matters in any jurisdiction. The Oak Street Parties shall consult with their own advisors concerning such matters and each shall be responsible for making its own independent investigation and appraisal of the transactions contemplated hereby, and neither the Representatives nor any other Underwriter shall have any responsibility or liability to the Oak Street Parties with respect thereto. Any review by the Representatives and the other Underwriters of the Oak Street Parties, the transactions contemplated hereby or other matters relating to such transactions will be performed solely for the benefit of the Representatives and the other Underwriters and shall not be on behalf of the Oak Street Parties.

3. Representations and Warranties of the Oak Street Parties. Each Oak Street Party, jointly and severally, represents and warrants to each Underwriter that:

(a) Preliminary Prospectus. No order preventing or suspending the use of any Preliminary Prospectus has been issued by the Commission, and each Preliminary Prospectus included in the Pricing Disclosure Package, at the time of filing thereof, complied in all material respects with the Securities Act, and no Preliminary Prospectus, at the time of filing thereof, contained any untrue statement of a material fact or omitted to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that the Oak Street Parties make no representation or warranty with respect to any statements or omissions made in reliance upon and in conformity with information relating to any Underwriter furnished to the Company in writing by such Underwriter through the Representatives expressly for use in any Preliminary Prospectus, it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in Section 7(c) hereof.

(b) Pricing Disclosure Package. The Pricing Disclosure Package as of the Applicable Time did not, and as of the Closing Date and as of the Additional Closing Date, as the case may be, will not, contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that the Oak Street Parties make no representation or warranty with respect to any statements or omissions made in reliance upon and in conformity with information relating to any Underwriter furnished to the Company in writing by such Underwriter through the Representatives expressly for use in such Pricing Disclosure Package, it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in Section 7(c) hereof. No statement of material fact included in the Prospectus has been omitted from the Pricing Disclosure Package and no statement of material fact included in the Pricing Disclosure Package that is required to be included in the Prospectus has been omitted therefrom.

(c) Issuer Free Writing Prospectus. Other than the Registration Statement, the Preliminary Prospectus and the Prospectus, the Company (including its agents and representatives, other than the Underwriters in their capacity as such) has not prepared, made, used, authorized, approved or referred to and will not prepare, make, use, authorize, approve or refer to any “written communication” (as defined in Rule 405 under the Securities Act) that constitutes an offer to sell or solicitation of an offer to buy the Shares (each such communication by the Company or its agents and representatives (other than a communication referred to in clause (i) below) an “Issuer Free Writing Prospectus”) other than (i) any document not constituting a prospectus pursuant to Section 2(a)(10)(a) of the Securities Act or Rule 134 under the Securities Act or (ii) the documents listed on Annex A hereto, each electronic road show and any other written communications approved in writing in advance by the Representatives, such approval not to be unreasonably withheld or delayed. Each such Issuer Free Writing Prospectus complies in all material respects with the Securities Act, has been or will be (within the time period specified in Rule 433) filed in accordance with the Securities Act (to the extent required thereby) and does not conflict with the information contained in the Registration Statement or the Pricing Disclosure Package, and, when taken together with the Preliminary Prospectus accompanying or delivered prior to delivery of such Issuer Free Writing Prospectus, did not, and as of the Closing Date and as of the Additional Closing Date, as the case may be, will not, contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that Oak Street Parties make no representation or warranty with respect to any statements or omissions made in each such Issuer Free Writing Prospectus or Preliminary Prospectus in reliance upon and in conformity with information relating to any Underwriter furnished to the Company in writing by such Underwriter through the Representatives expressly for use in such Issuer Free Writing Prospectus or Preliminary Prospectus, it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in Section 7(c) hereof.

(d) Emerging Growth Company. From the time of the initial confidential submission of the Registration Statement to the Commission (or, if earlier, the first date on which the Company engaged directly or through any person authorized to act on its behalf in any Testing-the-Waters Communication) through the date hereof, the Company has been and is an “emerging growth company,” as defined in Section 2(a) of the Securities Act (an “Emerging Growth Company”). “Testing-the-Waters Communication” means any oral or written communication with potential investors undertaken in reliance on Section 5(d) of the Securities Act.

(e) Testing-the-Waters Materials. The Company (i) has not alone engaged in any Testing-the-Waters Communications other than Testing-the-Waters Communications with the consent of the Representatives with entities that are reasonably believed to be qualified institutional buyers within the meaning of Rule 144A under the Securities Act or institutions that are accredited investors within the meaning of Rule 501 under the Securities Act and (ii) has not authorized anyone other than the Representatives to engage in Testing-the-Waters Communications. The Company reconfirms that the Representatives have been authorized to act on its behalf in undertaking Testing-the-Waters Communications by virtue of a writing substantially in the form of Exhibit A hereto. The Company has not distributed or approved for distribution any Written Testing-the-Waters Communications other than those listed on Annex B hereto. “Written Testing-the-Waters Communication” means any Testing-the-Waters Communication that is a written communication within the meaning of Rule 405 under the Securities Act. Any individual Written Testing-the-Waters Communication does not conflict with the information contained in the Registration Statement or the Pricing Disclosure Package, complied in all material respects with the Securities Act, and when taken together with the Pricing Disclosure Package as of the Applicable Time, did not, and as of the Closing Date and as of the Additional Closing Date, as the case may be, will not, contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

(f) Registration Statement and Prospectus. The Registration Statement has been declared effective by the Commission. No order suspending the effectiveness of the Registration Statement has been issued by the Commission, and no proceeding for that purpose or pursuant to Section 8A of the Securities Act against the Company or related to the offering of the Shares has been initiated or, to the Oak Street Parties’ knowledge, threatened by the Commission; as of the applicable effective date of the Registration Statement and any post-effective amendment thereto, the Registration Statement and any such post-effective amendment complied and will comply in all material respects with the Securities Act, and did not and will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary in order to make the statements therein not misleading; and as of the date of the Prospectus and any amendment or supplement thereto and as of the Closing Date and as of the Additional Closing Date, as the case may be, the Prospectus will comply in all material respects with the Securities Act and will not contain any untrue statement of a material fact or omit to

state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that the Oak Street Parties make no representation or warranty with respect to any statements or omissions made in reliance upon and in conformity with information relating to any Underwriter furnished to the Company in writing by such Underwriter through the Representatives expressly for use in the Registration Statement and the Prospectus and any amendment or supplement thereto, it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in Section 7(c) hereof.

(g) Financial Statements. The financial statements (including the related notes thereto) of the Company and the LLC and its consolidated subsidiaries included in the Registration Statement, the Pricing Disclosure Package and the Prospectus comply in all material respects with the applicable requirements of the Securities Act and present fairly, in all material respects, the financial position of the Company and the LLC and its consolidated subsidiaries as of the dates indicated and the results of their operations and the changes in their cash flows for the periods specified; such financial statements have been prepared in conformity with generally accepted accounting principles (“GAAP”) in the United States applied on a consistent basis throughout the periods covered thereby, except in the case of unaudited financial statements, which are subject to normal period-end adjustments and do not contain footnotes as permitted by the applicable rules of the Commission, and any supporting schedules included in the Registration Statement present fairly, in all material respects, the information required to be stated therein; the other financial information included in the Registration Statement, the Pricing Disclosure Package and the Prospectus has been derived from the accounting records of the Company or the LLC and its consolidated subsidiaries, as applicable, and presents fairly in all material respects the information shown thereby; and all disclosures included in the Registration Statement, the Pricing Disclosure Package and the Prospectus regarding “non-GAAP financial measures” (as such term is defined by the rules and regulations of the Commission) comply with Regulation G of the Securities Exchange Act of 1934, as amended, and the rules and regulations of the Commission thereunder (collectively, the “Exchange Act”) and Item 10 of Regulation S-K of the Securities Act, to the extent applicable.

(h) No Material Adverse Change. Since the date of the most recent financial statements of the Company included in the Registration Statement, the Pricing Disclosure Package and the Prospectus, (i) there has not been any change in the capital stock or outstanding equity, as applicable (other than the issuance of shares of common stock upon exercise of stock options and warrants described as outstanding in, the exchange, if any, of equity interests of the LLC for shares of common stock of the Company, and the grant of options and awards under existing equity incentive plans, in each case, described in, the Registration Statement, the Pricing Disclosure Package and the Prospectus), short-term debt or long-term debt of any Oak Street Party or any of its subsidiaries, or any dividend or distribution of any kind declared, set aside for payment, paid or made by the Company or the LLC on any class of capital stock or other equity interests, as

applicable,; (ii) there has not been any material adverse change, or any development that would reasonably be expected to result in a material adverse change, in properties, management, the financial condition, stockholders’ equity, results of operations, or business of the Oak Street Parties and their subsidiaries taken as a whole or on the performance by the Oak Street Parties of their obligations under this Agreement (a “Material Adverse Effect”); (iii) neither the Oak Street Parties nor any of their subsidiaries has entered into any transaction or agreement (whether or not in the ordinary course of business) that is material to the Oak Street Parties and their subsidiaries taken as a whole or incurred any liability or obligation, direct or contingent, that is material to the Oak Street Parties and their subsidiaries taken as a whole, except as otherwise disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus; and (iv) neither the Oak Street Parties nor any of their subsidiaries has sustained any loss or interference with its business that is either from fire, explosion, flood or other calamity, whether or not covered by insurance, or from any labor disturbance or dispute or any action, order or decree of any court or arbitrator or governmental or regulatory authority, except in each case as otherwise disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus, and except in each case as would not reasonably be expected to have a Material Adverse Effect.

(i) Organization and Good Standing. Each Oak Street Party and each of its subsidiaries have been duly organized and are validly existing and, to the extent such concept is applicable, in good standing under the laws of their respective jurisdictions of organization, are duly qualified to do business and, to the extent such concept is applicable, are in good standing in each jurisdiction in which their respective ownership or lease of property or the conduct of their respective businesses requires such qualification, and have all power and authority necessary to own or hold their respective properties and to conduct the businesses in which they are engaged, except where the failure to be so qualified or in good standing or have such power or authority would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. The subsidiaries listed in Schedule 2 to this Agreement are the only significant subsidiaries of the Oak Street Parties.

(j) Capitalization. Each Oak Street Party has an authorized capitalization as set forth in the Registration Statement, the Pricing Disclosure Package and the Prospectus under the heading “Capitalization”; all the outstanding shares of capital stock of the Company have been duly and validly authorized and issued and are fully paid and non-assessable and are not subject to any pre-emptive or similar rights; except as described in or expressly contemplated by the Registration Statement, the Pricing Disclosure Package and the Prospectus, there are no outstanding rights (including, without limitation, pre-emptive rights), warrants or options to acquire, or instruments convertible into or exchangeable for, any shares of capital stock or other equity interest in the Company or any of its subsidiaries (including, without limitation, the LLC), or any contract, commitment, agreement, understanding or arrangement of any kind relating to the issuance of any capital stock or equity interest of the Company or any such subsidiary (including, without limitation, the LLC), any such convertible or exchangeable securities

or any such rights, warrants or options; upon consummation of the Organizational Transactions, the capital stock of the Company and the equity interests of the LLC will conform in all material respects to the description thereof contained in the Registration Statement, the Pricing Disclosure Package and the Prospectus; and all the outstanding shares of capital stock or other equity interests of each subsidiary owned, directly or indirectly, by the Company have been duly and validly authorized and issued, are fully paid and non-assessable, in the case of equity interests in any such subsidiary that is not a corporation, the Company or other holder of such equity interests has no obligation to make payments or contributions to such subsidiary or its creditors solely by reason of its ownership of such equity interests and except as otherwise described in the Registration Statement, the Pricing Disclosure Package and the Prospectus and are owned directly or indirectly by the Company, free and clear of any lien, charge, encumbrance, security interest, restriction on voting or transfer or any other claim of any third party, except for such lien, charge, encumbrance, security interest, restriction on voting or transfer or any other claim of any third party as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

(k) Stock Options. With respect to the stock options (the “Stock Options”), if any, granted pursuant to the stock-based compensation plans of the any Oak Street Party and its subsidiaries (the “Company Stock Plans”), (i) each Stock Option intended to qualify as an “incentive stock option” under Section 422 of the Code so qualifies, (ii) each grant of a Stock Option was duly authorized no later than the date on which the grant of such Stock Option was by its terms to be effective (the “Grant Date”) by all necessary corporate action, including, as applicable, approval by the board of directors of the applicable Oak Street Party, or its general partner, sole, or managing member, as the case may be, (or a duly constituted and authorized committee thereof) and any required stockholder approval by the necessary number of votes or written consents, and the award agreement governing such grant (if any) was duly executed and delivered by each party thereto, (iii) each such grant was made in accordance with the terms of the Company Stock Plans, the Exchange Act and all other applicable laws and regulatory rules or requirements, including the rules of the New York Stock Exchange and any other exchange on which Company securities are traded, and (iv) each such grant was properly accounted for in accordance with GAAP in the financial statements (including the related notes) of the applicable Oak Street Party. The Company has not knowingly granted, and there is no and has been no policy or practice of the Company of granting, Stock Options prior to, or otherwise coordinating the grant of Stock Options with, the release or other public announcement of material information regarding the Company or its subsidiaries or their results of operations or prospects.

(l) Due Authorization. Each Oak Street Party has full right, power and authority to execute and deliver this Agreement and to perform its obligations hereunder; and all action required to be taken for the due and proper authorization, execution and delivery by it of this Agreement and the consummation by it of the transactions contemplated hereby has been duly and validly taken.

(m) Underwriting Agreement. This Agreement has been duly authorized, executed and delivered by the each Oak Street Party.

(n) The Shares. The Shares to be issued and sold by the Company hereunder have been duly authorized by the Company and, when issued and delivered and paid for as provided herein, will be duly and validly issued, will be fully paid and nonassessable and will conform in all material respects to the descriptions thereof in the Registration Statement, the Pricing Disclosure Package and the Prospectus; and the issuance of the Shares is not subject to any preemptive or similar rights

(o) Descriptions of the Underwriting Agreement. This Agreement conforms in all material respects to the description thereof contained in the Registration Statement, the Pricing Disclosure Package and the Prospectus.

(p) No Violation or Default. None of the Oak Street Parties or any of their respective subsidiaries is (i) in violation of its charter or by-laws or similar organizational documents; (ii) in default, and no event has occurred that, with notice or lapse of time or both, would constitute such a default, in the due performance or observance of any term, covenant or condition contained in any indenture, mortgage, deed of trust, loan agreement or other agreement or instrument to which any Oak Street Party or any of its subsidiaries is a party or by which any Oak Street Party or any of its subsidiaries is bound or to which any property or asset of any Oak Street Party or any of its subsidiaries is subject; or (iii) in violation of any law or statute applicable to any Oak Street Party or any judgment, order, rule or regulation of any court or arbitrator or governmental or regulatory authority having jurisdiction over any Oak Street Party or any of its subsidiaries, except, in the case of clauses (ii) and (iii) above, for any such default or violation that would not, individually or in the aggregate, have a Material Adverse Effect.

(q) No Conflicts. The execution, delivery and performance by each Oak Street Party of this Agreement, the issuance and sale of the Shares by the Company and the consummation by the Company of the transactions (including, without limitation, the Organizational Transactions) contemplated by this Agreement or the Pricing Disclosure Package and the Prospectus will not (i) conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under, result in the termination, modification or acceleration of, or result in the creation or imposition of any lien, charge or encumbrance upon any property, right or asset of any Oak Street Party or any of its subsidiaries pursuant to, any indenture, mortgage, deed of trust, loan agreement or other agreement or instrument to which the any Oak Street Party or any of its subsidiaries is a party or by which any Oak Street Party or any of its subsidiaries is bound or to which any property, right or asset of the Oak Street Party or any of its subsidiaries is subject, (ii) result in any violation of the provisions of the charter or by-laws or similar organizational documents of any Oak Street Party or any of its subsidiaries or (iii) result in the violation of any law or statute or any judgment, order, rule or regulation of any court or arbitrator or governmental or regulatory authority, except, in the case of clauses (i) and (iii) above, for any such conflict, breach, violation, default, lien, charge or encumbrance that would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

(r) No Consents Required. No consent, approval, authorization, order, registration or qualification of or with any court or arbitrator or governmental or regulatory authority is required for the execution, delivery and performance by the Company of this Agreement and the consummation of the Organizational Transactions and the transactions contemplated by this Agreement, (i) except for the registration of the Shares under the Securities Act and such consents, approvals, authorizations, orders and registrations or qualifications as may be required by the Financial Industry Regulatory Authority, Inc. (“FINRA”) and under applicable state securities laws in connection with the purchase and distribution of the Shares by the Underwriters, (ii), at or prior to the Closing Date, any filing or submission required in connection with the Organizational Transactions, or (iii) any such consents, approvals, authorizations, orders, filings, registrations or qualifications of which the failure to obtain would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect or materially affect the ability to consummate the transactions contemplated by this Agreement.

(s) Legal Proceedings. Except as described in the Registration Statement, the Pricing Disclosure Package and the Prospectus, there are no legal, governmental or regulatory investigations, actions, demands, claims, suits, arbitrations, inquiries or proceedings (including by the U.S. Department of Health and Human Services (“HHS”) and any office contained therein) (collectively, “Actions”) pending to which any Oak Street Party or any of its subsidiaries is or may be a party or to which any property of any Oak Street Party or any of its subsidiaries is or may be the subject that, individually or in the aggregate, if determined adversely to any Oak Street Party or any of its subsidiaries, would reasonably be expected to have a Material Adverse Effect; to the knowledge of the Oak Street Parties, no such Actions are threatened or, contemplated by any governmental or regulatory authority or threatened by others; and (i) there are no current or pending Actions that are required under the Securities Act to be described in the Registration Statement, the Pricing Disclosure Package or the Prospectus that are not so described in the Registration Statement, the Pricing Disclosure Package and the Prospectus and (ii) there are no statutes, regulations or contracts or other documents that are required under the Securities Act to be filed as exhibits to the Registration Statement or described in the Registration Statement, the Pricing Disclosure Package or the Prospectus that are not so filed as exhibits to the Registration Statement or described in the Registration Statement, the Pricing Disclosure Package and the Prospectus.

(t) Independent Accountants. Ernst & Young LLP, which has certified certain financial statements of the Company, the LLC and their respective subsidiaries, is an independent registered public accounting firm with respect to the Company and its subsidiaries within the applicable rules and regulations adopted by the Commission and the Public Company Accounting Oversight Board (United States) and as required by the Securities Act.

(u) Title to Real and Personal Property. Each Oak Street Party and its subsidiaries have good and marketable title in fee simple to, or have valid rights to lease or otherwise use, all items of real and personal property that are material to the respective businesses of such each Oak Street Party and its subsidiaries, in each case free and clear of all liens, encumbrances, claims and defects and imperfections of title except those that (i) do not materially interfere with the use made and proposed to be made of such property by such Oak Street Party and its subsidiaries or (ii) would not reasonably be expected, individually or in the aggregate, to have a Material Adverse Effect.

(v) Intellectual Property. (i) Each Oak Street Party and its subsidiaries own or have the right to use all patents, patent applications, trademarks, service marks, trade names, trademark registrations, service mark registrations, domain names and other source indicators, copyrights and copyrightable works, know-how, trade secrets, systems, procedures, proprietary or confidential information and all other worldwide intellectual property, industrial property and proprietary rights (collectively, “Intellectual Property”) used in the conduct of their respective businesses, except where the failure to own or have the right to use any of the foregoing would not reasonably be expected to have a Material Adverse Effect; (ii) to the knowledge of each Oak Street Party, the Oak Street Party’s and its subsidiaries’ conduct of their respective businesses does not infringe, misappropriate or otherwise violate any Intellectual Property of any person; (iii) each Oak Street Party and its subsidiaries have not received any written notice of any claim relating to Intellectual Property, which claim, if determined unfavorably, would reasonably be expected to have a Material Adverse Effect; and (iv) to the knowledge of the Oak Street Parties, the Intellectual Property of the Oak Street Parties and their respective subsidiaries is not being infringed, misappropriated or otherwise violated by any person.

(w) No Undisclosed Relationships. No relationship, direct or indirect, exists between or among any Oak Street Party or any of its subsidiaries, on the one hand, and the directors, officers, stockholders, customers, suppliers or other affiliates of any Oak Street Party or any of its subsidiaries, on the other, that is required by the Securities Act to be described in each of the Registration Statement and the Prospectus and that is not so described in such documents and in the Pricing Disclosure Package.

(x) Investment Company Act. Each Oak Street Party is not and, after giving effect to the offering and sale of the Shares and the application of the proceeds thereof received by each Oak Street Party as described in the Registration Statement, the Pricing Disclosure Package and the Prospectus, will not be required to register as an “investment company” or an entity “controlled” by an “investment company” within the meaning of the Investment Company Act of 1940, as amended, and the rules and regulations of the Commission thereunder (collectively, the “Investment Company Act”).

(y) Taxes. Except, in each case, as would not have a Material Adverse Effect, each Oak Street Party and its subsidiaries have paid all federal, state, local and foreign taxes and filed all tax returns required to be paid or filed through the date hereof, subject to permitted extensions and other than taxes that are being contested in good faith and for

which adequate reserves have been provided in accordance with GAAP; and except as otherwise disclosed in each of the Registration Statement, the Pricing Disclosure Package and the Prospectus, there is no tax deficiency that has been, or to the knowledge of each Oak Street Party could reasonably be expected to be, asserted against any Oak Street Party or any of its subsidiaries or any of their respective properties or assets.

(z) Licenses and Permits. Each Oak Street Party and its subsidiaries possess all licenses, sub-licenses, certificates, permits and other authorizations issued by, and have made all declarations and filings with, the appropriate federal, state, local or foreign governmental or regulatory authorities that are necessary for the ownership or lease of their respective properties or the conduct of their respective businesses as described in each of the Registration Statement, the Pricing Disclosure Package and the Prospectus, except where the failure to possess or make the same would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect; and except as described in each of the Registration Statement, the Pricing Disclosure Package and the Prospectus, none of the Oak Street Parties or any of their respective subsidiaries has received notice of any revocation or modification of any such license, sub-license, certificate, permit or authorization or has any reason to believe that any such license, sub-license, certificate, permit or authorization will not be renewed in the ordinary course, except where such revocation, modification or nonrenewal would not reasonably be expected to have a Material Adverse Effect.

(aa) No Labor Disputes. No labor disturbance by or dispute with employees of any Oak Street Party or any of its subsidiaries exists or, to the knowledge of the Oak Street Parties, is contemplated or threatened, and no Oak Street Party is aware of any existing or imminent labor disturbance by, or dispute with, the employees of any of its subsidiaries’ principal suppliers, contractors or customers, except as would not have a Material Adverse Effect. None of the Oak Street Parties or any of their respective subsidiaries has received any notice of cancellation or termination with respect to any collective bargaining agreement to which it is a party.

(bb) Certain Environmental Matters. (i) Each Oak Street Party and its subsidiaries (x) are in compliance with all, and have not violated any, applicable federal, state, local and foreign laws (including common law), rules, regulations, requirements, decisions, judgments, decrees, orders and other legally enforceable requirements relating to pollution or the protection of human health or safety, the environment, natural resources, hazardous or toxic substances or wastes, pollutants or contaminants (collectively, “Environmental Laws”); (y) have received and are in compliance with all, and have not violated any, permits, licenses, certificates or other authorizations or approvals required of them under any Environmental Laws to conduct their respective businesses; and (z) have not received notice of any actual or potential liability or obligation under or relating to, or any actual or potential violation of, any Environmental Laws, including for the investigation or remediation of any disposal or release of hazardous or toxic substances or wastes, pollutants or contaminants, and have no knowledge of any event or condition that would reasonably be expected to result in any such notice, and (ii) there are no costs or liabilities associated with Environmental Laws

of or relating to any Oak Street Party or its subsidiaries, except in the case of each of (i) and (ii) above, for any such matter as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect; and (iii) except as described in each of the Pricing Disclosure Package and the Prospectus, (x) there is no proceeding that is pending, or that is known to be contemplated, against any Oak Street Party or any of its subsidiaries under any Environmental Laws in which a governmental entity is also a party, other than such proceedings regarding which it is reasonably believed no monetary sanctions of $100,000 or more will be imposed and (y) none of the Oak Street Parties or any of their respective subsidiaries is aware of any facts or issues regarding compliance with Environmental Laws, or liabilities or other obligations under Environmental Laws or concerning hazardous or toxic substances or wastes, pollutants or contaminants, that would reasonably be expected to have a Material Adverse Effect on the capital expenditures or earnings of the Oak Street Parties and their respective subsidiaries and (z) none of the Oak Street Parties or any of their respective subsidiaries anticipates material capital expenditures relating to any Environmental Law.

(cc) Compliance with ERISA. (i) Each employee benefit plan, within the meaning of Section 3(3) of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), for which any Oak Street Party or any member of its “Controlled Group” (defined as any entity, whether or not incorporated, that is under common control with the Oak Street Parties within the meaning of Section 4001(a)(14) of ERISA or any entity that would be regarded as a single employer with the Company under Section 414(b),(c),(m) or (o) of the Internal Revenue Code of 1986, as amended (the “Code”)) would have any liability (each, a “Plan”) has been maintained in compliance with its terms and the requirements of any applicable statutes, orders, rules and regulations, including but not limited to ERISA and the Code; (ii) no prohibited transaction, within the meaning of Section 406 of ERISA or Section 4975 of the Code, has occurred with respect to any Plan, excluding transactions effected pursuant to a statutory or administrative exemption; (iii) for each Plan that is subject to the funding rules of Section 412 of the Code or Section 302 of ERISA, no Plan has failed (whether or not waived), or is reasonably expected to fail, to satisfy the minimum funding standards (within the meaning of Section 302 of ERISA or Section 412 of the Code) applicable to such Plan; (iv) no Plan is, or is reasonably expected to be, in “at risk status” (within the meaning of Section 303(i) of ERISA) and no Plan that is a “multiemployer plan” within the meaning of Section 4001(a)(3) of ERISA is in “endangered status” or “critical status” (within the meaning of Sections 304 and 305 of ERISA) (v) the fair market value of the assets of each Plan exceeds the present value of all benefits accrued under such Plan (determined based on those assumptions used to fund such Plan); (vi) no “reportable event” (within the meaning of Section 4043(c) of ERISA and the regulations promulgated thereunder) has occurred or is reasonably expected to occur; (vii) each Plan that is intended to be qualified under Section 401(a) of the Code is so qualified, and nothing has occurred, whether by action or by failure to act, which would cause the loss of such qualification; (viii) neither the Oak Street Parties nor any member of the Controlled Group has incurred, nor reasonably expects to incur, any liability under Title IV of ERISA (other than contributions to the Plan or premiums to the Pension Benefit Guarantee Corporation,

in the ordinary course and without default) in respect of a Plan (including a “multiemployer plan” within the meaning of Section 4001(a)(3) of ERISA); and (ix) none of the following events has occurred or is reasonably likely to occur: (A) a material increase in the aggregate amount of contributions required to be made to all Plans by any Oak Street Party or its Controlled Group affiliates in the current fiscal year of such Oak Street Party and its Controlled Group affiliates compared to the amount of such contributions made in such Oak Street Party’s and its Controlled Group affiliates’ most recently completed fiscal year; or (B) a material increase in any Oak Street Party and its subsidiaries’ “accumulated post-retirement benefit obligations” (within the meaning of Accounting Standards Codification Topic 715-60) compared to the amount of such obligations in the Company and its subsidiaries’ most recently completed fiscal year, except in each case with respect to the events or conditions set forth in (i) through (ix) hereof, as would not, individually or in the aggregate, have a Material Adverse Effect.

(dd) Disclosure Controls. Except as disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus, the Company and its subsidiaries maintain an effective system of “disclosure controls and procedures” (as defined in Rule 13a-15(e) of the Exchange Act) that complies with the requirements of the Exchange Act and that has been designed to ensure that information required to be disclosed by the Company in reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Commission’s rules and forms, including controls and procedures designed to ensure that such information is accumulated and communicated to the Company’s management as appropriate to allow timely decisions regarding required disclosure.

(ee) Accounting Controls. Except as disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus, the Oak Street Parties and their respective subsidiaries, taken as a whole, maintain systems of “internal control over financial reporting” (as defined in Rule 13a-15(f) of the Exchange Act) that comply with the requirements of the Exchange Act applicable to the Company and have been designed by, or under the supervision of, their respective principal executive and principal financial officers, or persons performing similar functions, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with GAAP. Except as disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus, the Oak Street Parties and their respective subsidiaries maintain internal accounting controls sufficient to provide reasonable assurance that (i) transactions are executed in accordance with management’s general or specific authorizations; (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with GAAP and to maintain asset accountability; (iii) access to assets is permitted only in accordance with management’s general or specific authorization; and (iv) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences. Except as disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus, any Oak Street Party is not aware of any material weaknesses in its internal controls (it being understood that this

subsection shall not require the Company to comply with Section 404 of the Sarbanes-Oxley Act of 2002 as of an earlier date than it would otherwise be required to so comply under applicable law). The auditors of each Oak Street Party and the Audit Committee of the Board of Directors of the Company have been advised of: (i) all significant deficiencies and material weaknesses in the design or operation of internal controls over financial reporting which have adversely affected or are reasonably likely to adversely affect such Oak Street Party’s ability to record, process, summarize and report financial information; and (ii) any fraud, whether or not material, that involves management or other employees who have a significant role in such Oak Street Party’s internal controls over financial reporting.

(ff) Insurance. Each Oak Street Party and its subsidiaries have insurance covering their respective properties, operations, personnel and businesses, including business interruption insurance, which insurance is in amounts and insures against such losses and risks as are generally maintained by similarly situated companies and which each Oak Street Party reasonably believes are adequate to protect such Oak Street Party and its subsidiaries and their respective businesses; and none of the Oak Street Parties or their respective subsidiaries has (i) received notice from any insurer or agent of such insurer that capital improvements or other expenditures are required or necessary to be made in order to continue such insurance or (ii) any reason to believe that it will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage at reasonable cost from similar insurers as may be necessary to continue its business.

(gg) Cybersecurity; Privacy; Data Protection. Each Oak Street Party and its subsidiaries’ information technology assets and equipment, computers, systems, networks, hardware, software, websites, applications, and databases (collectively, “IT Systems”) are, in each Oak Street Party and its subsidiaries’ reasonable belief, adequate for, and operate and perform in all material respects as required in connection with, the operation of the business of each Oak Street Party and its subsidiaries as currently conducted, free and clear of all bugs, errors, defects, Trojan horses, time bombs, malware and other corruptants, except as would not reasonably be expected to have a Material Adverse Effect. Each Oak Street Party and its subsidiaries have implemented and maintained commercially reasonable controls, policies, procedures and safeguards to maintain and protect their material confidential information and the integrity, continuous operation, redundancy and security of all IT Systems and data (including all personal or personally identifiable data (“Personal Data”)) used in connection with its business and, to the knowledge of each Oak Street Party, there have been no breaches, violations, outages or unauthorized uses of or accesses to its IT Systems or data (including Personal Data), except for those that (x) did not or would not reasonably be expected to result in a Material Adverse Effect and (y) have been remedied without material cost or liability or the duty to notify any governmental authority, nor any material incidents under internal review or investigations relating to such breaches, violations, outages or unauthorized uses or accesses. Except as disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus, each Oak Street Party is presently in compliance

with all applicable U.S. state and federal data privacy and security laws and regulations, including without limitation the Health Insurance Portability and Accountability Act of 1996 (“HIPAA”) as amended by the Health Information Technology for Economic and Clinical Health Act (the “HITECH Act”) (collectively, the “Privacy Laws”) and all judgments, orders, rules and regulations of any court or arbitrator or governmental or regulatory authority, internal policies and contractual obligations relating to the privacy and security of IT Systems and Personal Data and to the protection of such IT Systems and Personal Data from unauthorized use, access, misappropriation or modification, except as would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Effect. To each Oak Street Party’s knowledge, it has at all times made all disclosures to users or customers required by applicable laws and regulatory rules or requirements, and no such disclosures made or contained in any external written privacy policy have been materially inaccurate or in violation of any applicable Privacy Laws. Each Oak Street Party: (i) has not received written notice of any actual or potential liability under or relating to, or actual or potential violation of, any of the Privacy Laws, and has no knowledge of any event or condition that would reasonably be expected to result in any such notice; (ii) is not currently conducting or paying for, in whole or in part, any investigation, remediation, or other corrective action pursuant to any Privacy Law; and (iii) is not a party to any governmental order, decree, or agreement that imposes any obligation or liability under any Privacy Law.

(hh) No Unlawful Payments. None of the Oak Street Parties, any of their respective subsidiaries, any director or officer of any Oak Street Party or any of its subsidiaries or, to the knowledge of the Oak Street Parties, any agent, employee, affiliate or other person associated with or acting on behalf of any Oak Street Party or any of its subsidiaries has (i) used any corporate funds for any unlawful contribution, gift, entertainment or other unlawful expense relating to political activity; (ii) made or taken an act in furtherance of an offer, promise or authorization of any direct or indirect unlawful payment or benefit to any foreign or domestic government official or employee, including of any government-owned or controlled entity or of a public international organization, or any person acting in an official capacity for or on behalf of any of the foregoing, or any political party or party official or candidate for political office; (iii) violated or is in violation of any provision of the Foreign Corrupt Practices Act of 1977, as amended, or any applicable law or regulation implementing the OECD Convention on Combating Bribery of Foreign Public Officials in International Business Transactions, or committed an offence under the Bribery Act 2010 of the United Kingdom or any other applicable anti-bribery or anti-corruption law; or (iv) made, offered, agreed or requested any unlawful bribe or other unlawful benefit, including, without limitation, any rebate, payoff, influence payment, kickback or other unlawful or improper payment or benefit. Each Oak Street Party and its subsidiaries has instituted, maintain and enforce, and will continue to maintain and enforce policies and procedures designed to promote and ensure compliance with all applicable anti-bribery and anti-corruption laws.

(ii) Compliance with Anti-Money Laundering Laws. The operations of each Oak Street Party and its subsidiaries are and have been conducted at all times in compliance with applicable financial recordkeeping and reporting requirements, including those of the Currency and Foreign Transactions Reporting Act of 1970, as amended, the applicable money laundering statutes of all jurisdictions where any Oak Street Party or any of its subsidiaries conducts business, the rules and regulations thereunder and any related or similar rules, regulations or guidelines issued, administered or enforced by any governmental agency (collectively, the “Anti-Money Laundering Laws”), and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving any Oak Street Party or any of its subsidiaries with respect to the Anti-Money Laundering Laws is pending or, to the knowledge of the Oak Street Parties, threatened.

(jj) No Conflicts with Sanctions Laws. None of the Oak Street Parties, any of their respective subsidiaries, directors, or officers , or, to the knowledge of the Oak Street Parties, any employee, agent, affiliate or other person acting on behalf of any Oak Street Party or any of its subsidiaries is currently the subject or the target of any sanctions administered or enforced by the U.S. government (including, without limitation, the Office of Foreign Assets Control of the U.S. Department of the Treasury (“OFAC”) or the U.S. Department of State and including, without limitation, the designation as a “specially designated national” or “blocked person”), the United Nations Security Council (“UNSC”), the European Union, Her Majesty’s Treasury (“HMT”) or other relevant sanctions authority (collectively, “Sanctions”), nor is any Oak Street Party or any of its subsidiaries located, organized or resident in a country or territory that is the subject of Sanctions, including, without limitation, Crimea, Cuba, Iran, North Korea and Syria (each, a “Sanctioned Country”); and the Oak Street Parties will not directly or indirectly use the proceeds of the offering of the Shares hereunder, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other person or entity (i) to fund or facilitate any activities of or business with any person that, at the time of such funding or facilitation, is the subject or target of Sanctions, (ii) to fund or facilitate any activities of or business in any Sanctioned Country or (iii) in any other manner that will result in a violation by any person (including any person participating in the transaction, whether as underwriter, advisor, investor or otherwise) of Sanctions. For the past five years, the Oak Street Parties and their subsidiaries have not knowingly engaged in and are not now knowingly engaged in any dealings or transactions with any person that at the time of the dealing or transaction is or was the subject or the target of Sanctions or with any Sanctioned Country.

(kk) No Restrictions on Subsidiaries. Except as otherwise disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus, no subsidiary of any Oak Street Party is currently prohibited, directly or indirectly, under any agreement or other instrument to which it is a party or is subject, from paying any dividends to any Oak Street Party, from making any other distribution on such subsidiary’s capital stock or similar ownership interest, from repaying to any Oak Street Party any loans or advances to such subsidiary from such Oak Street Party or from transferring any of such subsidiary’s properties or assets to any Oak Street Party or any other subsidiary of any Oak Street Party.

(ll) No Broker’s Fees. None of the Oak Street Parties or any of their respective subsidiaries is a party to any contract, agreement or understanding with any person (other than this Agreement) that would give rise to a valid claim against any of them or any Underwriter for a brokerage commission, finder’s fee or like payment in connection with the offering and sale of the Shares.

(mm) No Registration Rights. Except as otherwise disclosed in the Registration Statement, the Pricing Disclosure Package and the Prospectus, no person has the right to require any Oak Street Party or any of its subsidiaries to register any securities for sale under the Securities Act by reason of the filing of the Registration Statement with the Commission, the issuance and sale of the Shares.

(nn) No Stabilization. None of the Oak Street Parties or any of its subsidiaries or affiliates has taken, directly or indirectly, any action designed to or that could reasonably be expected to cause or result in any stabilization or manipulation of the price of the Shares.

(oo) Margin Rules. Neither the issuance, sale and delivery of the Shares nor the application of the proceeds therefrom by the Company as described in each of the Registration Statement, the Pricing Disclosure Package and the Prospectus will violate Regulation T, U or X of the Board of Governors of the Federal Reserve System.

(pp) Forward-Looking Statements. No forward-looking statement (within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act) included or incorporated by reference in any of the Registration Statement, the Pricing Disclosure Package or the Prospectus has been made or reaffirmed without a reasonable basis or has been disclosed other than in good faith.

(qq) Statistical and Market Data. Nothing has come to the attention of any Oak Street Party that has caused such Oak Street Party to believe that the statistical and market-related data included in each of the Registration Statement, the Pricing Disclosure Package and the Prospectus is not based on or derived from sources that are reliable and accurate in all material respects.

(rr) Sarbanes-Oxley Act. There is and has been no failure on the part of the Company or any of the Company’s directors or officers, in their capacities as such, to comply with any applicable provision of the Sarbanes-Oxley Act of 2002, as amended and the rules and regulations promulgated in connection therewith (the “Sarbanes-Oxley Act”), including Section 402 related to loans and Sections 302 and 906 related to certifications, to the extent compliance is required as of the date of this Agreement.

(ss) Status under the Securities Act. At the time of filing the Registration Statement and any post-effective amendment thereto, at the earliest time thereafter that the Company or any offering participant made a bona fide offer (within the meaning of Rule 164(h)(2) under the Securities Act) of the Shares and at the date hereof, the Company was not and is not an “ineligible issuer,” as defined in Rule 405 under the Securities Act.

(tt) No Ratings. There are (and prior to the Closing Date, will be) no debt securities, convertible securities or preferred stock issued or guaranteed by any Oak Street Party or any of its subsidiaries that are rated by a “nationally recognized statistical rating organization”, as such term is defined in Section 3(a)(62) under the Exchange Act.

(uu) Healthcare Regulatory Compliance. To the extent required in connection with their respective businesses, each of Oak Street Party and its respective subsidiaries has the requisite provider number or other authorization to bill the Medicare program in the state or states in which such entity operates; none of the Oak Street Parties or, any of their respective subsidiaries is subject to any pending, or, to the Oak Street Parties’ knowledge, threatened or contemplated action which could reasonably be expected to result either in revocation of any provider number or authorization or in the Oak Street Parties’ or any respective subsidiary’s exclusion from any state Medicare programs; each Oak Street Party’s and each subsidiary’s business practices have been structured in a manner reasonably designed to comply with the federal or state laws governing Medicare programs, including, without limitation, Sections 1320a-7a and 1320a-7b of Title 42 of the United States Code, and each Oak Street Party reasonably believes that it is in material compliance with such laws, except as set forth in or contemplated in the Time of Sale Information and the Prospectus; each Oak Street Party and each subsidiary has taken reasonable actions designed to ensure it is in material compliance with (i) the False Claims Act, 31 U.S.C. Sections 3729-3733, (ii) the “Stark” law, 42 U.S.C. § 1395nn, (iii) the Federal Criminal False Claims Act, 18 U.S.C. § 287, (iv) the Federal TRICARE statute, 10 U.S.C. § 1071 et seq., (v) the False Statements Relating to Health Care Matters statute, 18 U.S.C. § 1035 or (vi) the Health Care Fraud statute, 18 U.S.C. § 1347; each Oak Street Party and each subsidiary has taken reasonable actions designed to ensure that each subsidiary does not allow any individual with an ownership or control interest (as defined in 42 U.S.C. § 1320a-3(a)(3)) in each Oak Street Party or any subsidiary or any officer, director or managing employee (as defined in 42 U.S.C. § 1320a-5(b)) of each Oak Street Party or any subsidiary who would be a person excluded from participation in any federal health care program (as defined in 42 U.S.C. § 1320a-7b(f)) as described in 42 U.S.C. § 1320a-7(b)(8) to participate in any such federal health care program maintained by each Oak Street Party or any subsidiary; and each Oak Street Party and its subsidiaries have structured their respective business practices in a manner reasonably designed to comply, in all material respects, with the federal and state laws regarding physician ownership of (or financial relationship with), and the referral to entities providing, healthcare related goods or services, and laws requiring disclosure of financial interests held by physicians in entities to which they may refer patients for the provisions of health care related goods and services, and the Company reasonably believes that it is in material compliance with such laws.

(vv) Directed Share Program. Each Oak Street Party represents and warrants that (i) the Registration Statement, the Pricing Disclosure Package and the Prospectus, any Preliminary Prospectus and any Issuer Free Writing Prospectuses comply in all material respects, and any further amendments or supplements thereto will comply in all material respects, with any applicable laws or regulations of foreign jurisdictions in

which the Pricing Disclosure Package, the Prospectus, any Preliminary Prospectus and any Issuer Free Writing Prospectus, as amended or supplemented, if applicable, are distributed in connection with the Directed Share Program, and that (ii) no authorization, approval, consent, license, order, registration or qualification of or with any government, governmental instrumentality or court, other than such as have been obtained, is necessary under the securities laws and regulations of foreign jurisdictions in which the Directed Shares are offered outside the United States. The Company has not offered, or caused the underwriters to offer, Shares to any person pursuant to the Directed Share Program with the specific intent to unlawfully influence (i) a customer or supplier of the Oak Street Parties to alter the customer or supplier’s level or type of business with the Oak Street Parties, or (ii) a trade journalist or publication to write or publish favorable information about the Oak Street Parties or their products.

4. Further Agreements of the Oak Street Parties. Each Oak Street Party, jointly and severally, covenants and agrees with each Underwriter that:

(a) Required Filings. The Company will file the final Prospectus with the Commission within the time periods specified by Rule 424(b) and Rule 430A or 430C under the Securities Act, will file any Issuer Free Writing Prospectus to the extent required by Rule 433 under the Securities Act; and the Company will furnish copies of the Prospectus and each Issuer Free Writing Prospectus (to the extent not previously delivered) to the Underwriters in New York City prior to 10:00 A.M., New York City time, on the business day next succeeding the date of this Agreement in such quantities as the Representatives may reasonably request.

(b) Delivery of Copies. The Company will deliver, without charge, (i) to the Representatives, three signed copies of the Registration Statement as originally filed and each amendment thereto, in each case including all exhibits and consents filed therewith; and (ii) to each Underwriter (A) a conformed copy of the Registration Statement as originally filed and each amendment thereto (without exhibits) and (B) during the Prospectus Delivery Period (as defined below), as many copies of the Prospectus (including all amendments and supplements thereto and each Issuer Free Writing Prospectus) as the Representatives may reasonably request. As used herein, the term “Prospectus Delivery Period” means such period of time after the first date of the public offering of the Shares as in the opinion of counsel for the Underwriters a prospectus relating to the Shares is required by law to be delivered (or required to be delivered but for Rule 172 under the Securities Act) in connection with sales of the Shares by any Underwriter or dealer.

(c) Amendments or Supplements, Issuer Free Writing Prospectuses. Before making, preparing, using, authorizing, approving, referring to or filing any Issuer Free Writing Prospectus, and before filing any amendment or supplement to the Registration Statement, the Pricing Disclosure Package or the Prospectus, the Company will furnish to the Representatives and counsel for the Underwriters a copy of the proposed Issuer Free Writing Prospectus, amendment or supplement for review and will not make, prepare, use, authorize, approve, refer to or file any such Issuer Free Writing Prospectus or file any such proposed amendment or supplement to which the Representatives reasonably object.

(d) Notice to the Representatives. The Company will advise the Representatives promptly, and confirm such advice in writing (which may be by electronic mail), (i) when the Registration Statement has become effective; (ii) when any amendment to the Registration Statement has been filed or becomes effective; (iii) when any supplement to the Pricing Disclosure Package, the Prospectus, any Issuer Free Writing Prospectus or any Written Testing-the-Waters Communication or any amendment to the Prospectus has been filed or distributed; (iv) of any request by the Commission for any amendment to the Registration Statement or any amendment or supplement to the Prospectus or the receipt of any comments from the Commission relating to the Registration Statement or any other request by the Commission for any additional information including, but not limited to, any request for information concerning any Testing-the-Waters Communication; (v) of the issuance by the Commission or any other governmental or regulatory authority of any order suspending the effectiveness of the Registration Statement or preventing or suspending the use of any Preliminary Prospectus, any of the Pricing Disclosure Package, the Prospectus or any Written Testing-the-Waters Communication or the initiation or, to each Oak Street Party’s knowledge, threatening of any proceeding for that purpose or pursuant to Section 8A of the Securities Act; (vi) of the occurrence of any event or development within the Prospectus Delivery Period as a result of which the Prospectus, any of the Pricing Disclosure Package, any Issuer Free Writing Prospectus or any Written Testing-the-Waters Communication as then amended or supplemented would include any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances existing when the Prospectus, the Pricing Disclosure Package, any such Issuer Free Writing Prospectus or any Written Testing-the-Waters Communication is delivered to a purchaser, not misleading; and (vii) of the receipt by the Company of any notice with respect to any suspension of the qualification of the Shares for offer and sale in any jurisdiction or the initiation or, to each Oak Street Party’s knowledge, threatening of any proceeding for such purpose; and the Company will use its commercially reasonable efforts to prevent the issuance of any such order suspending the effectiveness of the Registration Statement, preventing or suspending the use of any Preliminary Prospectus, any of the Pricing Disclosure Package or the Prospectus or any Written Testing-the-Waters Communication or suspending any such qualification of the Shares and, if any such order is issued, will use its reasonable best efforts to obtain as soon as possible the withdrawal thereof.

(e) Ongoing Compliance. (1) If during the Prospectus Delivery Period (i) any event or development shall occur or condition shall exist as a result of which the Prospectus as then amended or supplemented would include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances existing when the Prospectus is delivered to a purchaser, not misleading or (ii) it is necessary to amend or supplement the Prospectus to comply with applicable law, the Company will promptly notify the Underwriters thereof

and forthwith prepare and, subject to paragraph (c) above, file with the Commission and furnish to the Underwriters and to such dealers as the Representatives may designate such amendments or supplements to the Prospectus as may be necessary so that the statements in the Prospectus as so amended or supplemented will not, in the light of the circumstances existing when the Prospectus is delivered to a purchaser, be misleading or so that the Prospectus will comply with law and (2) if at any time prior to the Closing Date (i) any event or development shall occur or condition shall exist as a result of which the Pricing Disclosure Package as then amended or supplemented would include any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances existing when the Pricing Disclosure Package is delivered to a purchaser, not misleading or (ii) it is necessary to amend or supplement the Pricing Disclosure Package to comply with applicable law, the Company will promptly notify the Underwriters thereof and forthwith prepare and, subject to paragraph (c) above, file with the Commission (to the extent required) and furnish to the Underwriters and to such dealers as the Representatives may designate, such amendments or supplements to the Pricing Disclosure Package as may be necessary so that the statements in the Pricing Disclosure Package as so amended or supplemented will not, in the light of the circumstances existing when the Pricing Disclosure Package is delivered to a purchaser, be misleading or so that the Pricing Disclosure Package will comply with applicable law.

(f) Blue Sky Compliance. If required by the applicable law, the Company will qualify the Shares for offer and sale under the securities or Blue Sky laws of such jurisdictions as the Representatives shall reasonably request and will continue such qualifications in effect so long as required for distribution of the Shares; provided that the Company shall not be required to (i) qualify as a foreign corporation or other entity or as a dealer in securities in any such jurisdiction where it would not otherwise be required to so qualify, (ii) file any general consent to service of process in any such jurisdiction or (iii) subject itself to taxation in any such jurisdiction if it is not otherwise so subject.

(g) Earning Statement. The Company will make generally available to its security holders and the Representatives as soon as practicable an earning statement that satisfies the provisions of Section 11(a) of the Securities Act and Rule 158 of the Commission promulgated thereunder covering a period of at least twelve months beginning with the first fiscal quarter of the Company occurring after the “effective date” (as defined in Rule 158) of the Registration Statement; provided that the Company will be deemed to comply with such requirement by filing such earnings statements on the Commission’s Electronic, Data Gathering, Analysis and Retrieval System (“EDGAR”) (or any successor system).

(h) Clear Market. For a period of 180 days after the date of the Prospectus (the “Company Lock-Up Period”), the Company will not (i) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend or otherwise transfer or dispose of, directly or indirectly, or submit to, or file with, the Commission a registration statement under the Securities Act relating to, any shares of Stock or any securities convertible into

or exercisable or exchangeable for Stock, or publicly disclose the intention to undertake any of the foregoing, or (ii) enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of ownership of the Stock or any such other securities, whether any such transaction described in clause (i) or (ii) above is to be settled by delivery of Stock or such other securities, in cash or otherwise, without the prior written consent of J.P. Morgan Securities LLC, other than the Shares to be sold hereunder and any shares of Stock of the Company issued upon the exercise of options granted under Company Stock Plans; provided, however, that the foregoing restriction shall not apply to: (i) the Shares to be sold hereunder; (ii) the issuance by the Company of shares of Stock, including upon the vesting, exercise or settlement of options or restricted stock units or the conversion of convertible securities or the exchange of exchangeable securities, or options to purchase shares of Stock or the grant of other equity-based awards (including any securities convertible into shares of Stock), in each case pursuant to the Company’s equity plans of the Oak Street Parties that are described in the Registration Statement, the Pricing Disclosure Package and the Prospectus; (iii) the entry into an agreement providing for the issuance by the Company of shares of Stock or any security convertible into or exercisable for shares of Stock in connection with the acquisition by the Company or any of its subsidiaries of the securities, businesses, property or other assets of another person or entity or pursuant to an employee benefit plan assumed by the Company in connection with such acquisition, or the issuance of any such securities pursuant to any such agreement; (iv) the entry into any agreement providing for the issuance of shares of Stock or any security convertible into or exercisable for shares of Stock in connection with joint ventures, commercial relationships or other strategic transactions, and the issuance of any such securities pursuant to any such agreement; (v) the filing of any registration statement on Form S-8 relating to securities granted or to be granted pursuant to the Company’s equity-based compensation plans of the Oak Street Parties that are described in the Registration Statement, the Pricing Disclosure Package and the Prospectus or any associated employee benefit plan contemplated by clause (iii); or (vi) provided that in the case of clauses (iii) and (iv), the number of shares of Stock that the Company may sell or issue or agree to sell or issue pursuant to such clauses shall not exceed, in the aggregate, 10% of the total number of shares of Stock issued and outstanding immediately following the Closing Date; provided further that in the case of clause (iv) Stock or other securities issued pursuant to such clause shall be subject to a contractual agreement, substantially in the form of Exhibit D hereto and provided, further, that in the case of clauses (ii) through (iv), (x) the Company shall cause each recipient of such securities to execute and deliver to you, on or prior to the issuance of such securities, a lock-up letter on substantially the same terms as the lock-up letter referred to in Section 6(m) hereof, and (y) the Company shall enter stop transfer instructions with the Company’s transfer agent and registrar on such securities until the expiration of the Company Lock-Up Period.

If J.P. Morgan Securities LLC, in its sole discretion, agrees to release or waive the restrictions set forth in Section 6(a) or a lock-up letter described in Section 6(m) hereof for an officer or director of the Company and provide the Company with notice of the impending release or waiver substantially in the form of Exhibit B hereto at least three

business days before the effective date of the release or waiver (indicating the effective date of such release or waiver in such notice to the Company), the Company agrees to announce the impending release or waiver by a press release substantially in the form of Exhibit C hereto through a major news service at least two business days before the effective date of the release or waiver.

(i) Use of Proceeds. The Company will apply the net proceeds from the sale of the Shares as described in each of the Registration Statement, the Pricing Disclosure Package and the Prospectus under the heading “Use of Proceeds.”

(j) No Stabilization. Neither the Company nor its subsidiaries or affiliates will take, directly or indirectly, any action designed to or that could reasonably be expected to cause or result in any stabilization or manipulation of the price of the Stock.

(k) Exchange Listing. The Company will use its reasonable best efforts to list, subject to notice of issuance, the Shares on the New York Stock Exchange (the “Exchange”).

(l) Reports. For a period of three years following the date hereof, so long as the Company is subject to the reporting requirements of either Section 13 or Section 15(d) of the Exchange Act, the Company will furnish to the Representatives, as soon as they are available, copies of all reports or other communications (financial or other) furnished to holders of the Shares, and copies of any reports and financial statements furnished to or filed with the Commission or any national securities exchange or automatic quotation system; provided that the Company will be deemed to have furnished such reports and financial statements to the Representatives to the extent they are filed on EDGAR.

(m) Record Retention. The Company will, pursuant to reasonable procedures developed in good faith, retain copies of each Issuer Free Writing Prospectus that is not filed with the Commission in accordance with Rule 433 under the Securities Act.

(n) Filings. The Company will file with the Commission such reports as may be required by Rule 463 under the Securities Act.

(o) Directed Share Program. Each Oak Street Party will comply with all applicable securities and other laws, rules and regulations in each jurisdiction in which the Directed Shares are offered in connection with the Directed Share Program.

(p) Emerging Growth Company. The Company will promptly notify the Representatives if the Company ceases to be an Emerging Growth Company at any time prior to the later of (i) completion of the distribution of Shares within the meaning of the Securities Act and (ii) completion of the 180-day restricted period referred to in Section 4(h) hereof.

5. Certain Agreements of the Underwriters. Each Underwriter hereby severally represents and agrees that:

(a) It has not and will not use, authorize use of, refer to or participate in the planning for use of, any “free writing prospectus”, as defined in Rule 405 under the Securities Act (which term includes use of any written information furnished to the Commission by the Company and not incorporated by reference into the Registration Statement and any press release issued by the Company) other than (i) a free writing prospectus that contains no “issuer information” (as defined in Rule 433(h)(2) under the Securities Act) that was not included (including through incorporation by reference) in the Preliminary Prospectus or a previously filed Issuer Free Writing Prospectus, (ii) any Issuer Free Writing Prospectus listed on Annex A or prepared pursuant to Section 3(c) above (including any electronic road show approved in advance by the Company), or (iii) any free writing prospectus prepared by such underwriter and approved by the Company in advance in writing (each such free writing prospectus referred to in clauses (i) or (iii), an “Underwriter Free Writing Prospectus”).

(b) It has not and will not, without the prior written consent of the Company, use any free writing prospectus that contains the final terms of the Shares unless such terms have previously been included in a free writing prospectus filed with the Commission; provided that Underwriters may use a term sheet substantially in the form of Annex C hereto without the consent of the Company; provided, further, that any Underwriter using such term sheet shall notify the Company, and provide a copy of such term sheet to the Company, prior to, or substantially concurrently with, the first use of such term sheet.

(c) It is not subject to any pending proceeding under Section 8A of the Securities Act with respect to the offering (and will promptly notify the Company if any such proceeding against it is initiated during the Prospectus Delivery Period).

6. Conditions of Underwriters’ Obligations. The obligation of each Underwriter to purchase the Underwritten Shares on the Closing Date or the Option Shares on the Additional Closing Date, as the case may be, as provided herein is subject to the performance by the Company of its covenants and other obligations hereunder and to the following additional conditions:

(a) Registration Compliance; No Stop Order. No order suspending the effectiveness of the Registration Statement shall be in effect, and no proceeding for such purpose or pursuant to Section 8A under the Securities Act shall be pending before or, to the knowledge of the Oak Street Parties, threatened by the Commission; the Prospectus and each Issuer Free Writing Prospectus shall have been timely filed with the Commission under the Securities Act (in the case of an Issuer Free Writing Prospectus, to the extent required by Rule 433 under the Securities Act) and in accordance with Section 4(a) hereof; and all requests by the Commission for additional information shall have been complied with to the reasonable satisfaction of the Representatives.

(b) Representations and Warranties. The respective representations and warranties of each Oak Street Party contained herein shall be true and correct on the date hereof and on and as of the Closing Date or the Additional Closing Date, as the case may be; and the statements of each Oak Street Party and its officers made in any certificates delivered pursuant to this Agreement shall be true and correct on and as of the Closing Date or the Additional Closing Date, as the case may be.

(c) No Material Adverse Change. No event or condition of a type described in Section 3(h) hereof shall have occurred or shall exist, which event or condition is not described in the Pricing Disclosure Package (excluding any amendment or supplement thereto) and the Prospectus (excluding any amendment or supplement thereto) and the effect of which in the judgment of the Representatives makes it impracticable or inadvisable to proceed with the offering, sale or delivery of the Shares on the Closing Date or the Additional Closing Date, as the case may be, on the terms and in the manner contemplated by this Agreement, the Pricing Disclosure Package and the Prospectus.

(d) Officer’s Certificate. The Representatives shall have received on and as of the Closing Date or the Additional Closing Date, as the case may be, a certificate of the chief financial officer or chief accounting officer of the Company and one additional senior executive officer of the Company who is satisfactory to the Representatives (i) confirming that such officers have carefully reviewed the Registration Statement, the Pricing Disclosure Package and the Prospectus and, to the knowledge of such officers, the representations of each Oak Street Party set forth in Sections 3(b) and 3(f) hereof are true and correct, (ii) confirming that the other representations and warranties of each Oak Street Party in this Agreement are true and correct and that each Oak Street Party has complied in all material respects with all agreements and satisfied all conditions on its part to be performed or satisfied hereunder at or prior to the Closing Date or the Additional Closing Date, as the case may be, and (iii) to the effect set forth in paragraphs (a) and (c) above.

(e) Comfort Letters. (i) On the date of this Agreement and on the Closing Date or the Additional Closing Date, as the case may be, Ernst & Young LLP shall have furnished to the Representatives, at the request of the Company, letters, dated the respective dates of delivery thereof and addressed to the Underwriters, in form and substance reasonably satisfactory to the Representatives, containing statements and information of the type customarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements and certain financial information contained in each of the Registration Statement, the Pricing Disclosure Package and the Prospectus; provided that the letter delivered on the Closing Date or the Additional Closing Date, as the case may be, shall use a “cut-off” date no more than two business days prior to such Closing Date or such Additional Closing Date, as the case may be. (ii) On the date of this Agreement and on the Closing Date or the Additional Closing Date, as the case may be, the Company shall have furnished to the Representatives a certificate, dated the respective dates of delivery thereof and addressed to the Underwriters, of its chief financial officer with respect to certain financial data contained in the Pricing Disclosure Package and the Prospectus, providing “management comfort” with respect to such information, in form and substance reasonably satisfactory to the Representative.

(f) Opinion and 10b-5 Statement of Counsel for the Company. Kirkland & Ellis LLP, counsel for the Company, shall have furnished to the Representatives, at the request of the Company, their written opinion and 10b-5 statement, dated the Closing Date or the Additional Closing Date, as the case may be, and addressed to the Underwriters, in form and substance reasonably satisfactory to the Representatives.

(g) Opinion of Regulatory Counsel for the Company. Epstein Becker & Green, P.C., special regulatory counsel for the Company, shall have furnished to the Representatives, their written opinion, dated the Closing Date or the Additional Closing Date, as the case may be, and addressed to the Underwriters, in form and substance reasonably satisfactory to the Representatives, to the effect set forth in Annex D-2 hereto.

(i) Opinion and 10b-5 Statement of Counsel for the Underwriters. The Representatives shall have received on and as of the Closing Date or the Additional Closing Date, as the case may be, an opinion and 10b-5 statement, addressed to the Underwriters, of Davis Polk & Wardwell LLP, counsel for the Underwriters, with respect to such matters as the Representatives may reasonably request, and such counsel shall have received such documents and information as they may reasonably request to enable them to pass upon such matters.

(j) No Legal Impediment to Issuance and/or Sale. No action shall have been taken and no statute, rule, regulation or order shall have been enacted, adopted or issued by any federal, state or foreign governmental or regulatory authority that would, as of the Closing Date or the Additional Closing Date, as the case may be, prevent the issuance or sale of the Shares by the Company; and no injunction or order of any federal, state or foreign court shall have been issued that would, as of the Closing Date or the Additional Closing Date, as the case may be, prevent the issuance or sale of the Shares by the Company.

(k) Good Standing. The Representatives shall have received on and as of the Closing Date or the Additional Closing Date, as the case may be, satisfactory evidence of the good standing of each Oak Street Party and its subsidiaries in their respective jurisdictions of organization and their good standing in such other jurisdictions as the Representatives may reasonably request, in each case in writing or any standard form of telecommunication from the appropriate governmental authorities of such jurisdictions.

(l) Exchange Listing. The Shares to be delivered on the Closing Date or the Additional Closing Date, as the case may be, shall have been approved for listing on the New York Stock Exchange, subject to official notice of issuance.

(m) Lock-up Agreements. The “lock-up” agreements, each substantially in the form of Exhibit D hereto, between you and certain shareholders, and substantially all the officers and directors of the Oak Street Parties relating to sales and certain other

dispositions of shares of Stock or certain other securities, delivered to you on or before the date hereof, shall be full force and effect on the Closing Date or the Additional Closing Date, as the case may be.

(n) Organizational Transactions. Prior to or substantially concurrent with the issuance of the Underwritten Shares and payment therefor in accordance with this Agreement, the Organizational Transactions shall have been consummated in a manner consistent in all material respects with the descriptions thereof in the Registration Statement, Pricing Disclosure Package and the Prospectus.

(o) Additional Documents. On or prior to the Closing Date the Oak Street Parties shall have furnished to the Representatives such further certificates and documents as the Representatives may reasonably request.

All opinions, letters, certificates and evidence mentioned above or elsewhere in this Agreement shall be deemed to be in compliance with the provisions hereof only if they are in form and substance reasonably satisfactory to counsel for the Underwriters.

7. Indemnification and Contribution.

(a) Indemnification of the Underwriters by the Company. The Oak Street Parties, jointly and severally, agree to indemnify and hold harmless each Underwriter, its affiliates, directors and officers and each person, if any, who controls such Underwriter within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act, from and against any and all losses, claims, damages and liabilities (including, without limitation, reasonable legal fees and other reasonable expenses incurred in connection with any suit, action or proceeding or any claim asserted, as such fees and expenses are incurred), joint or several, that arise out of, or are based upon, (i) any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary in order to make the statements therein, not misleading, or (ii) any untrue statement or alleged untrue statement of a material fact contained in the Prospectus (or any amendment or supplement thereto), any Preliminary Prospectus, any Issuer Free Writing Prospectus, any “issuer information” filed or required to be filed pursuant to Rule 433(d) under the Securities Act, any Written Testing-the-Waters Communication, any road show as defined in Rule 433(h) under the Securities Act (a “road show”) or any Pricing Disclosure Package (including any Pricing Disclosure Package that has subsequently been amended), or caused by any omission or alleged omission to state therein a material fact necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading, in each case except insofar as such losses, claims, damages or liabilities arise out of, or are based upon, any untrue statement or omission or alleged untrue statement or omission made in reliance upon and in conformity with any information relating to any Underwriter furnished to the Company in writing by such Underwriter through the Representatives expressly for use therein, it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in paragraph (c) below.

(c) Indemnification of the Oak Street Parties. Each Underwriter agrees, severally and not jointly, to indemnify and hold harmless each Oak Street Party, the directors of the Company, the officers of the Company who signed the Registration Statement and each person, if any, who controls the Company within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act to the same extent as the indemnity set forth in paragraph (a) above, but only with respect to any losses, claims, damages or liabilities that arise out of, or are based upon, any untrue statement or omission or alleged untrue statement or omission made in reliance upon and in conformity with any information relating to such Underwriter furnished to the Company in writing by such Underwriter through the Representatives expressly for use in the Registration Statement, the Prospectus (or any amendment or supplement thereto), any Preliminary Prospectus, any Issuer Free Writing Prospectus, any Written Testing-the-Waters Communication, any road show or any Pricing Disclosure Package (including any Pricing Disclosure Package that has subsequently been amended), it being understood and agreed upon that the only such information furnished by any Underwriter consists of the following information in the Prospectus furnished on behalf of each Underwriter: the concession and reallowance figures appearing in the third paragraph under the caption “Underwriting” and the information contained in the sixth paragraph under the caption “Underwriting”.

(d) Notice and Procedures. If any suit, action, proceeding (including any governmental or regulatory investigation), claim or demand shall be brought or asserted against any person in respect of which indemnification may be sought pursuant to the preceding paragraphs of this Section 7, such person (the “Indemnified Person”) shall promptly notify the person against whom such indemnification may be sought (the “Indemnifying Person”) in writing; provided that the failure to notify the Indemnifying Person shall not relieve it from any liability that it may have under the preceding paragraphs of this Section 7 except to the extent that it has been materially prejudiced (through the forfeiture of substantive rights or defenses) by such failure; and provided, further, that the failure to notify the Indemnifying Person shall not relieve it from any liability that it may have to an Indemnified Person otherwise than under the preceding paragraphs of this Section 7. If any such proceeding shall be brought or asserted against an Indemnified Person and it shall have notified the Indemnifying Person thereof, the Indemnifying Person shall retain counsel reasonably satisfactory to the Indemnified Person (who shall not, without the consent of the Indemnified Person, be counsel to the Indemnifying Person) to represent the Indemnified Person and any others entitled to indemnification pursuant to this Section 7 that the Indemnifying Person may designate in such proceeding and shall pay the reasonable and documented fees and expenses in such proceeding and shall pay the reasonable and documented fees and expenses of such counsel related to such proceeding, as reasonably incurred. In any such proceeding, any Indemnified Person shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such Indemnified Person unless (i) the Indemnifying Person and the Indemnified Person shall have mutually agreed to the contrary; (ii) the Indemnifying Person has failed within a reasonable time to retain counsel reasonably satisfactory to the Indemnified Person; (iii) the Indemnified Person shall have reasonably concluded that there may be legal defenses available to it that are different from or in addition to those available to the Indemnifying Person; or (iv) the named parties in any such proceeding (including any impleaded parties) include both the Indemnifying Person and the Indemnified Person and representation of both parties by the same counsel would be

inappropriate due to actual or potential differing interests between them. It is understood and agreed that the Indemnifying Person shall not, in connection with any proceeding or related proceeding in the same jurisdiction, be liable for the reasonable fees and expenses of more than one separate firm (in addition to any local counsel) for all Indemnified Persons, and that all such fees and expenses shall be paid or reimbursed promptly as they are reasonably incurred. Any such separate firm for any Underwriter, its affiliates, directors and officers and any control persons of such Underwriter shall be designated in writing by the Representatives and any such separate firm for the Oak Street Parties, the directors of the Company, the officers of the Company who signed the Registration Statement and any control persons of the Company shall be designated in writing by the Company. The Indemnifying Person shall not be liable for any settlement of any proceeding effected without its written consent (which shall not be unreasonably withheld, delayed or conditioned), but if settled with such consent, the Indemnifying Person agrees to indemnify each Indemnified Person from and against any loss or liability by reason of such settlement. Notwithstanding the foregoing sentence, if at any time an Indemnified Person shall have requested that an Indemnifying Person reimburse the Indemnified Person for fees and expenses of counsel as contemplated by this paragraph, the Indemnifying Person shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by the Indemnifying Person of such request and (ii) the Indemnifying Person shall not have reimbursed the Indemnified Person in accordance with such request prior to the date of such settlement. No Indemnifying Person shall, without the written consent of the Indemnified Person, effect any settlement of any pending or threatened proceeding in respect of which any Indemnified Person is or could have been a party and indemnification could have been sought hereunder by such Indemnified Person, unless such settlement (x) includes an unconditional release of such Indemnified Person, in form and substance reasonably satisfactory to such Indemnified Person, from all liability on claims that are the subject matter of such proceeding and (y) does not include any statement as to or any admission of fault, culpability or a failure to act by or on behalf of any Indemnified Person.

(e) Contribution. If the indemnification provided for in paragraphs (a), (b) or (c) above is unavailable to an Indemnified Person or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then each Indemnifying Person under such paragraph, in lieu of indemnifying such Indemnified Person thereunder, shall contribute to the amount paid or payable by such Indemnified Person as a result of such losses, claims, damages or liabilities (i) in such proportion as is appropriate to reflect the relative benefits received by the Oak Street Parties, on the one hand, and the Underwriters on the other, from the offering of the Shares or (ii) if the allocation provided by clause (i) is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) but also the relative fault of the Oak Street Parties, on the one hand, and the Underwriters on the other, in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative benefits received by the Oak Street Parties, on the one hand, and the Underwriters on the other, shall be deemed to be in the same respective proportions as the net proceeds (before deducting expenses) received by the Company from the sale of the Shares and the total underwriting discounts and commissions received by the Underwriters in connection therewith, in each case as set forth in the table on the cover of the Prospectus, bear to the aggregate offering price of the Shares. The relative fault of

the Oak Street Parties, on the one hand, and the Underwriters on the other, shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Oak Street Parties or by the Underwriters and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

(f) Limitation on Liability. The Oak Street Parties and the Underwriters agree that it would not be just and equitable if contribution pursuant to paragraph (e) above were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in paragraph (e) above. The amount paid or payable by an Indemnified Person as a result of the losses, claims, damages and liabilities referred to in paragraph (e) above shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by such Indemnified Person in connection with any such action or claim. Notwithstanding the provisions of paragraphs (e) and (f), in no event shall an Underwriter be required to contribute any amount in excess of the amount by which the total underwriting discounts and commissions received by such Underwriter with respect to the offering of the Shares exceeds the amount of any damages that such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters’ obligations to contribute pursuant to paragraphs (e) and (f) are several in proportion to their respective purchase obligations hereunder and not joint.

(g) Non-Exclusive Remedies. The remedies provided for in this Section 7 paragraphs (a) through (f) are not exclusive and shall not limit any rights or remedies which may otherwise be available to any Indemnified Person at law or in equity.

(h) Directed Share Program Indemnification. The Oak Street Parties agree, jointly and severally, to indemnify and hold harmless the Directed Share Underwriter, its affiliates, directors and officers and each person, if any, who controls the Directed Share Underwriter within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act (each a “Directed Share Underwriter Entity”) from and against any and all losses, claims, damages and liabilities (including, without limitation, any legal fees and other expenses incurred in connection with defending or investigating any suit, action or proceeding or any claim asserted, as such fees and expenses are reasonably incurred) (i) caused by any untrue statement or alleged untrue statement of a material fact contained in any material prepared by or with the consent of the Company for distribution to Participants in connection with the Directed Share Program or caused by any omission or alleged omission to state therein a material fact necessary to make the statements therein, in light of the circumstances under which they were made, not misleading; (ii) caused by the failure of any Participant to pay for and accept delivery of Directed Shares that the Participant agreed to purchase; or (iii) related to, arising out of, or in connection with the Directed Share Program, other than losses, claims, damages or liabilities (or expenses relating thereto) that are finally judicially determined to have resulted from the bad faith or gross negligence of the Directed Share Underwriter Entities.

(i) In case any proceeding (including any governmental investigation) shall be instituted involving any Directed Share Underwriter Entity in respect of which indemnity may be sought pursuant to paragraph (h) above, the Directed Share Underwriter Entity seeking indemnity shall promptly notify the Company in writing and the Oak Street Parties, upon request of the Directed Share Underwriter Entity, shall retain counsel reasonably satisfactory to the Directed Share Underwriter Entity to represent the Directed Share Underwriter Entity and any others the Oak Street Parties may designate in such proceeding and shall pay the reasonable fees and disbursements of such counsel related to such proceeding. In any such proceeding, any Directed Share Underwriter Entity shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such Directed Share Underwriter Entity unless (i) the Oak Street Parties and such Directed Share Underwriter Entity shall have mutually agreed to the retention of such counsel, (ii) the Oak Street Parties have failed within a reasonable time to retain counsel reasonably satisfactory to such Directed Share Underwriter Entity, (iii) the Directed Share Underwriter Entity shall have reasonably concluded that there may be legal defenses available to it that are different from or in addition to those available to either Oak Street Party or (iv) the named parties to any such proceeding (including any impleaded parties) include either Oak Street Party and the Directed Share Underwriter Entity and representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. The Oak Street Parties shall not, in respect of the legal expenses of the Directed Share Underwriter Entities in connection with any proceeding or related proceedings in the same jurisdiction, be liable for the fees and expenses of more than one separate firm (in addition to any local counsel) for all Directed Share Underwriter Entities. The Oak Street Parties shall not be liable for any settlement of any proceeding effected without their written consent, but if settled with such consent, each Oak Street Party agrees, jointly and severally, to indemnify the Directed Share Underwriter Entities from and against any loss or liability by reason of such settlement. Notwithstanding the foregoing sentence, if at any time any Directed Share Underwriter Entity shall have requested the Oak Street Parties to reimburse such Directed Share Underwriter Entity for fees and expenses of counsel as contemplated by the second and third sentences of this paragraph, the Oak Street Parties agree that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by the Oak Street Parties of the aforesaid request and (ii) the Oak Street Parties shall not have reimbursed such Directed Share Underwriter Entity in accordance with such request prior to the date of such settlement. Neither Oak Street Party shall, without the prior written consent of the Directed Share Underwriter, effect any settlement of any pending or threatened proceeding in respect of which any Directed Share Underwriter Entity is or could have been a party and indemnity could have been sought hereunder by such Directed Share Underwriter Entity, unless (x) such settlement includes an unconditional release of the Directed Share Underwriter Entities from all liability on claims that are the subject matter of such proceeding and (y) does not include any statement as to or any admission of fault, culpability or a failure to act by or on behalf of the Directed Share Underwriter Entity.

(j) To the extent the indemnification provided for in paragraph (h) above is unavailable to a Directed Share Underwriter Entity or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then the Oak Street Parties, in lieu of indemnifying the Directed Share Underwriter Entity thereunder, shall contribute to the amount

paid or payable by the Directed Share Underwriter Entity as a result of such losses, claims, damages or liabilities (1) in such proportion as is appropriate to reflect the relative benefits received by the Oak Street Parties on the one hand and the Directed Share Underwriter Entities on the other hand from the offering of the Directed Shares or (2) if the allocation provided by clause 9(j)(1) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause 9(j)(1) above but also the relative fault of the Oak Street Parties on the one hand and of the Directed Share Underwriter Entities on the other hand in connection with any statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative benefits received by the Oak Street Parties on the one hand and the Directed Share Underwriter Entities on the other hand in connection with the offering of the Directed Shares shall be deemed to be in the same respective proportions as the net proceeds from the offering of the Directed Shares (before deducting expenses) and the total underwriting discounts and commissions received by the Directed Share Underwriter Entities for the Directed Shares, bear to the aggregate public offering price of the Directed Shares. If the loss, claim, damage or liability is caused by an untrue or alleged untrue statement of material fact or the omission or alleged omission to state a material fact, the relative fault of the Oak Street Parties on the one hand and the Directed Share Underwriter Entities on the other hand shall be determined by reference to, among other things, whether the untrue or alleged untrue statement or the omission or alleged omission relates to information supplied by either Oak Street Party or by the Directed Share Underwriter Entities and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

(k) The Oak Street Parties and the Directed Share Underwriter Entities agree that it would be not just or equitable if contribution pursuant to paragraph (j) above were determined by pro rata allocation (even if the Directed Share Underwriter Entities were treated as one entity for such purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in paragraph (j) above. The amount paid or payable by the Directed Share Underwriter Entities as a result of the losses, claims, damages and liabilities referred to in the immediately preceding paragraph shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by the Directed Share Underwriter Entities in connection with investigating or defending such any action or claim. Notwithstanding the provisions of paragraph (i) above, no Directed Share Underwriter Entity shall be required to contribute any amount in excess of the amount by which the total price at which the Directed Shares distributed to the public were offered to the public exceeds the amount of any damages that such Directed Share Underwriter Entity has otherwise been required to pay. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The remedies provided for in paragraphs (h) through (k) are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity.

(l) The indemnity and contribution provisions contained in paragraphs (h) through (k) shall remain operative and in full force and effect regardless of (i) any termination of this Agreement, (ii) any investigation made by or on behalf of any Directed Share Underwriter Entity or any Oak Street Party, its officers or directors or any person controlling the Company and (iii) acceptance of and payment for any of the Directed Shares.

8. Effectiveness of Agreement. This Agreement shall become effective as of the date first written above upon the execution and delivery hereof by the parties hereto.

9. Termination. This Agreement may be terminated in the absolute discretion of the Representatives, by notice to the Company if after the execution and delivery of this Agreement and on or prior to the Closing Date or, in the case of the Option Shares, on or prior to the Additional Closing Date, trading generally shall have been suspended or materially limited on or by any of the New York Stock Exchange or The Nasdaq Stock Market; (ii) trading of any securities issued or guaranteed by the Company shall have been suspended on any exchange or in any over-the-counter market; (iii) a general moratorium on commercial banking activities shall have been declared by federal or New York State authorities; or (iv) there shall have occurred any outbreak or escalation of hostilities or any change in financial markets or any calamity or crisis, either within or outside the United States, that, in the judgment of the Representatives, is material and adverse and makes it impracticable or inadvisable to proceed with the offering, sale or delivery of the Shares on the Closing Date or the Additional Closing Date, as the case may be, on the terms and in the manner contemplated by this Agreement, the Pricing Disclosure Package and the Prospectus.

10. Defaulting Underwriter.

(a) If, on the Closing Date or the Additional Closing Date, as the case may be, any Underwriter defaults on its obligation to purchase the Shares that it has agreed to purchase hereunder on such date, the non-defaulting Underwriters may in their discretion arrange for the purchase of such Shares by other persons satisfactory to the Company on the terms contained in this Agreement. If, within 36 hours after any such default by any Underwriter, the non-defaulting Underwriters do not arrange for the purchase of such Shares, then the Company shall be entitled to a further period of 36 hours within which to procure other persons satisfactory to the non-defaulting Underwriters to purchase such Shares on such terms. If other persons become obligated or agree to purchase the Shares of a defaulting Underwriter, either the non-defaulting Underwriters or the Company may postpone the Closing Date or the Additional Closing Date, as the case may be, for up to five full business days in order to effect any changes that in the opinion of counsel for the Company or counsel for the Underwriters may be necessary in the Registration Statement and the Prospectus or in any other document or arrangement, and the Company agrees to promptly prepare any amendment or supplement to the Registration Statement and the Prospectus that effects any such changes. As used in this Agreement, the term “Underwriter” includes, for all purposes of this Agreement unless the context otherwise requires, any person not listed in Schedule 1 hereto that, pursuant to this Section 10, purchases Shares that a defaulting Underwriter agreed but failed to purchase.

(b) If, after giving effect to any arrangements for the purchase of the Shares of a defaulting Underwriter or Underwriters by the non-defaulting Underwriters, the Company as provided in paragraph (a) above, the aggregate number of Shares that remain unpurchased on the Closing Date or the Additional Closing Date, as the case may be, does not exceed one-eleventh

of the aggregate number of Shares to be purchased on such date, then the Company shall have the right to require each non-defaulting Underwriter to purchase the number of Shares that such Underwriter agreed to purchase hereunder on such date plus such Underwriter’s pro rata share (based on the number of Shares that such Underwriter agreed to purchase on such date) of the Shares of such defaulting Underwriter or Underwriters for which such arrangements have not been made.

(c) If, after giving effect to any arrangements for the purchase of the Shares of a defaulting Underwriter or Underwriters by the non-defaulting Underwriters, the Company as provided in paragraph (a) above, the aggregate number of Shares that remain unpurchased on the Closing Date or the Additional Closing Date, as the case may be, exceeds one-eleventh of the aggregate amount of Shares to be purchased on such date, or if the Company shall not exercise the right described in paragraph (b) above, then this Agreement or, with respect to any Additional Closing Date, the obligation of the Underwriters to purchase Shares on the Additional Closing Date, as the case may be, shall terminate without liability on the part of the non-defaulting Underwriters. Any termination of this Agreement pursuant to this Section 10 shall be without liability on the part of the Oak Street Parties, except that the Oak Street Parties, jointly and severally, will continue to be liable for the payment of expenses as set forth in Section 11 hereof and except that the provisions of Section 7 hereof shall not terminate and shall remain in effect.

(d) Nothing contained herein shall relieve a defaulting Underwriter of any liability it may have to the Oak Street Parties or any non-defaulting Underwriter for damages caused by its default.

11. Payment of Expenses.

(a) Whether or not the transactions contemplated by this Agreement are consummated or this Agreement is terminated, the Oak Street Parties, jointly and severally, will pay or cause to be paid all costs and expenses incurred in connection with the performance of its obligations hereunder, including without limitation, (i) the costs incurred in connection with the authorization, issuance, sale, preparation and delivery of the Shares and any taxes payable in that connection; (ii) the costs incurred in connection with the preparation, printing and filing under the Securities Act of the Registration Statement, the Preliminary Prospectus, any Issuer Free Writing Prospectus, any Pricing Disclosure Package and the Prospectus (including all exhibits, amendments and supplements thereto) and the distribution thereof; (iii) the fees and expenses of the Company’s counsel and independent accountants; (iv) the fees and expenses incurred in connection with the registration or qualification and determination of eligibility for investment of the Shares under the laws of such jurisdictions as the Representatives may designate and the preparation, printing and distribution of a Blue Sky Memorandum (including the related reasonable and documented fees and expenses of counsel for the Underwriters); (v) the cost of preparing stock certificates, if applicable; (vi) the costs and charges of any transfer agent and any registrar; (vii) all expenses and application fees incurred in connection with any filing with, and clearance of the offering by, FINRA (including the related reasonable and documented fees and expenses of counsel for the Underwriters); (viii) all expenses incurred by the Company in connection with any “road show” presentation to potential investors; provided, however, that the cost of any

aircraft chartered in connection with the road show or any testing-the-waters meetings shall be paid 50% by the Company and 50% by the Underwriters; (ix) all expenses and application fees related to the listing of the Shares on the Exchange; and (x) all of the fees and disbursements of counsel incurred by the Underwriters in connection with the Directed Share Program and stamp duties, similar taxes or duties or other taxes, if any, incurred by the Underwriters in connection with the Directed Share Program; provided, however, that the amount payable by the Company pursuant to clause (iv) and (vii) of this Section 11(a) shall not exceed $40,000 in the aggregate for fees and expenses of counsel to the Underwriters.

(b) If (i) this Agreement is terminated pursuant to Section 9, (ii) the Company for any reason fails to tender the Shares for delivery to the Underwriters or (iii) the Underwriters decline to purchase the Shares for any reason permitted under this Agreement, the Oak Street Parties agree, jointly and severally, to reimburse the Underwriters for all documented out-of-pocket costs and expenses (including the reasonable fees and expenses of their counsel) reasonably incurred by the Underwriters in connection with this Agreement and the offering contemplated hereby. The Company shall not be required to pay or reimburse any costs, fees or expenses incurred by any Underwriter that defaults on its obligations to purchase the Shares.

12. Persons Entitled to Benefit of Agreement. This Agreement shall inure to the benefit of and be binding upon the parties hereto and their respective successors and the officers and directors and any controlling persons referred to herein and the affiliates of each Underwriter referred to in Section 7 hereof. Nothing in this Agreement is intended or shall be construed to give any other person any legal or equitable right, remedy or claim under or in respect of this Agreement or any provision contained herein. No purchaser of Shares from any Underwriter shall be deemed to be a successor merely by reason of such purchase.

13. Survival. The respective indemnities, rights of contribution, representations, warranties and agreements of the Oak Street Parties and the Underwriters contained in this Agreement or made by or on behalf of the Oak Street Parties or the Underwriters pursuant to this Agreement or any certificate delivered pursuant hereto shall survive the delivery of and payment for the Shares and shall remain in full force and effect, regardless of any termination of this Agreement or any investigation made by or on behalf of the Oak Street Parties or the Underwriters or the directors, officers, controlling persons or affiliates referred to in Section 7 hereof.

14. Certain Defined Terms. For purposes of this Agreement, (a) except where otherwise expressly provided, the term “affiliate” has the meaning set forth in Rule 405 under the Securities Act; (b) the term “business day” means any day other than a day on which banks are permitted or required to be closed in New York City; (c) the term “subsidiary” has the meaning set forth in Rule 405 under the Securities Act; and (d) the term “significant subsidiary” has the meaning set forth in Rule 1-02 of Regulation S-X under the Exchange Act.

15. Compliance with USA Patriot Act. In accordance with the requirements of the USA Patriot Act (Title III of Pub. L. 107-56 (signed into law October 26, 2001)), the Underwriters are required to obtain, verify and record information that identifies their respective clients, including the Company, which information may include the name and address of their respective clients, as well as other information that will allow the Underwriters to properly identify their respective clients.

16. Miscellaneous.

(a) Notices. All notices and other communications hereunder shall be in writing and shall be deemed to have been duly given if mailed or transmitted and confirmed by any standard form of telecommunication. Notices to the Underwriters shall be given to the Representatives c/o J.P. Morgan Securities LLC, 383 Madison Avenue, New York, New York 10179 (fax: (212) 622-8358); Attention: Equity Syndicate Desk and Goldman Sachs & Co. LLC, 200 West Street, New York, New York 10282, Attention: Registration Department. Notices to the Company shall be given to it at 30 W. Monroe St., #1200, Chicago, Illinois 60603; Attention: Chief Legal Officer, with a copy (which copy shall not constitute notice) to: Kirkland & Ellis LLP, 300 N. LaSalle, Chicago, Illinois 60654; Attention: Robert M. Hayward, P.C. and Robert E. Goedert, P.C.

(b) Governing Law. This Agreement and any claim, controversy or dispute arising under or related to this Agreement shall be governed by and construed in accordance with the laws of the State of New York.

(f) Waiver of Jury Trial. Each of the parties hereto hereby waives any right to trial by jury in any suit or proceeding arising out of or relating to this Agreement.

(g) Recognition of the U.S. Special Resolution Regimes.

(i) In the event that any Underwriter that is a Covered Entity becomes subject to a proceeding under a U.S. Special Resolution Regime, the transfer from such Underwriter of this Agreement, and any interest and obligation in or under this Agreement, will be effective to the same extent as the transfer would be effective under the U.S. Special Resolution Regime if this Agreement, and any such interest and obligation, were governed by the laws of the United States or a state of the United States.

(ii) In the event that any Underwriter that is a Covered Entity or a BHC Act Affiliate of such Underwriter becomes subject to a proceeding under a U.S. Special Resolution Regime, Default Rights under this Agreement that may be exercised against such Underwriter are permitted to be exercised to no greater extent than such Default Rights could be exercised under the U.S. Special Resolution Regime if this Agreement were governed by the laws of the United States or a state of the United States.

As used in this Section 16(g):

“BHC Act Affiliate” has the meaning assigned to the term “affiliate” in, and shall be interpreted in accordance with, 12 U.S.C. § 1841(k).

“Covered Entity” means any of the following:

(i) a “covered entity” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 252.82(b);

(ii) a “covered bank” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 47.3(b); or

(iii) a “covered FSI” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 382.2(b).

“Default Right” has the meaning assigned to that term in, and shall be interpreted in accordance with, 12 C.F.R. §§ 252.81, 47.2 or 382.1, as applicable.

“U.S. Special Resolution Regime” means each of (i) the Federal Deposit Insurance Act and the regulations promulgated thereunder and (ii) Title II of the Dodd-Frank Wall Street Reform and Consumer Protection Act and the regulations promulgated thereunder.

(h) Counterparts. This Agreement may be signed in counterparts (which may include counterparts delivered by any standard form of telecommunication), each of which shall be an original and all of which together shall constitute one and the same instrument.

(i) Amendments or Waivers. No amendment or waiver of any provision of this Agreement, nor any consent or approval to any departure therefrom, shall in any event be effective unless the same shall be in writing and signed by the parties hereto.

(j) Headings. The headings herein are included for convenience of reference only and are not intended to be part of, or to affect the meaning or interpretation of, this Agreement.

[Signature pages follow]

If the foregoing is in accordance with your understanding, please indicate your acceptance of this Agreement by signing in the space provided below.


Very truly yours,

OAK STREET HEALTH, INC.

By:		/s/ Mike Pykosz
		Name: Mike Pykosz Title: Chief Executive Officer


OAK STREET HEALTH, LLC.

By:		/s/ Mike Pykosz
		Name: Mike Pykosz Title: Chief Executive Officer

[Signature Page to Underwriting Agreement]

Accepted: As of the date first written above

J.P. MORGAN SECURITIES LLC

GOLDMAN SACHS & CO. LLC

For itself and on behalf of the several Underwriters listed in Schedule 1 hereto.


J.P. MORGAN SECURITIES LLC

By:		/s/ Alejandra Fernandez
		Name: Alejandra Fernandez
		Title: Executive Director


GOLDMAN SACHS & CO. LLC

By:		/s/ Goldman Sachs & Co. LLC
		Name: Karim Nensi
		Title: Managing Director

[Signature Page to Underwriting Agreement]

Schedule 1


Underwriter	Number of Shares
J.P. Morgan Securities LLC		4,160,417
Goldman Sachs & Co. LLC		3,614,873
Morgan Stanley & Co. LLC		3,103,009
William Blair & Company, L.L.C.		1,823,495
Piper Sandler & Co.		1,479,456
Robert W. Baird & Co. Incorporated		721,875
Truist Securities, Inc.		721,875
Total		15,625,000

Sch. 1-1

Schedule 2

Significant Subsidiaries

Oak Street Health, LLC

Oak Street Health MSO, LLC

OSH-ESC Joint Venture, LLC

Oak Street Health Medicare Partners, LLC

OSH-RI, LLC

OSH-PCJ Joliet, LLC

Acorn Network, LLC

Sch. 3-1

Annex A

a. Pricing Disclosure Package

None.

b. Pricing Information Provided Orally by Underwriters

Underwritten Shares: 15,625,000 shares

Public Offering Price Per Share: $21.00

Annex A-1

Annex B

Written Testing-the-Waters Communications

[None]

Annex B-1

Annex C

Oak Street Health, Inc.

Pricing Term Sheet

[None]

Annex C-1

Annex D-1

Form of Regulatory Opinion of Counsel for the Company

August 10, 2020

J.P. Morgan Securities LLC

Goldman Sachs & Co. LLC

As Representatives of the several Underwriters

c/o J.P. Morgan Securities LLC

383 Madison Avenue

New York, New York 10179

c/o Goldman Sachs & Co. LLC

200 West Street

New York, NY 10282

Ladies and Gentlemen:

We have acted as special healthcare regulatory counsel to Oak Street Health, Inc., a Delaware corporation (the “Company”), in connection with the filing by the Company of a Registration Statement on Form S-1 (the “Registration Statement”) with the Securities and Exchange Commission (the “SEC”).

In connection with this opinion, we have examined and relied upon the Registration Statement, and the final prospectus filed with the SEC on August XX, 2020 (the “Prospectus”). We have also reviewed the Underwriting Agreement executed and delivered to you on August 5, 2020, by the Company and selling stockholders (the “Underwriting Agreement”). In our examination, we have assumed the genuineness of all signatures, the authenticity and the conformity to original documents of all documents submitted to us as copies, and the truthfulness of all statements of fact contained therein. As to any facts material to this opinion, we have, to the extent that relevant facts were not independently established by us, relied, to the extent we have deemed reliance proper, upon certificates of public officials and certificates, oaths and declarations of officers or other representatives of the Company and upon the written representations contained in the Underwriting Agreement. Any opinion, statement or phrase preceded, modified or qualified by the phrase “to the knowledge of such counsel”, “to our knowledge” or a phrase having a similar meaning or referencing our knowledge or awareness, is made or given based only on the actual knowledge (as distinguished from constructive

Annex D-1-1

knowledge) of attorneys in this firm who are representing the Company in connection with this transaction or who otherwise provide substantive attention to the Company and who oversee the litigation and regulatory matters of the Company.

This opinion speaks as of the time and date of its delivery. We do not assume any obligation to provide you with any subsequent opinion or advice by reason of any fact about which we did not have knowledge at that time, by reason of any change subsequent to that time in any law, other governmental requirement or interpretation thereof covered by any of our opinions or advice, or for any other reason.

In rendering the following opinion, we express no opinion as to the laws of any jurisdiction other than the Federal Law of the United States to the extent specifically referred to herein. For purposes of this letter, (a) “Health Care Laws” shall mean the Medicare Law, Health Insurance Portability and Accountability Act, Health Information Technology for Economic and Clinical Health Act of 2009, Emergency Medical Treatment and Active Labor Act, Stark Law, Federal Anti-Kickback Statute, Federal Civil Monetary Penalties Law, Federal False Claims Act, Patient Protection and Affordable Care Act and the Medicare Prescription Drug, Improvement and Modernization Act, or the regulations promulgated thereunder; (b) “Material Adverse Effect” shall mean any material adverse change, or any development that would reasonably be expected to result in a material adverse change, in properties, management, the financial condition, stockholders’ equity, results of operations, or business of the Oak Street Parties (as such term is defined in the Underwriting Agreement) and their subsidiaries taken as a whole or on the performance by the Oak Street Parties of their obligations under the Underwriting Agreement; and (c) “Shares”, “Closing Date”, “Additional Closing Date” and “Pricing Disclosure Package” shall have the same meanings given to such terms in the Underwriting Agreement.

Based upon and subject to the foregoing, we are of the opinion that:

(a) No consent, approval, authorization, order, registration or filing under any Health Care Law is required for the execution, delivery and performance by the Company of the Underwriting Agreement, or the issuance and sale of the Shares on the Closing Date or the Additional Closing Date, as the case may be, pursuant to the Underwriting Agreement.

(b) The execution, delivery and performance by the Company of the Underwriting Agreement, and the issuance and sale of the Shares being delivered on the Closing Date or the Additional Closing Date, as the case may be, pursuant to the Underwriting Agreement will not conflict with or result in a breach or violation of any Health Care Law, except, for any such conflict, breach or violation that would not, individually or in the aggregate, have a Material Adverse Effect.

(c) To the knowledge of such counsel, except as described in the Registration Statement and the Prospectus, there are no legal or governmental actions, suits or proceedings pending under any Health Care Law against the Company or any of its subsidiaries in any court or before any regulatory agency which would have, individually or in the aggregate, if determined adversely to the Company or any of its subsidiaries, a Material Adverse Effect.

Annex D-1-2

(d) The descriptions in the Registration Statement, the Pricing Disclosure Package and the Prospectus under the following headings:

1. “Risk Factors—Risks Related to Our Business—New physicians and other providers must be properly enrolled in governmental healthcare programs before we can receive reimbursement for their services, and there may be delays in the enrollment process,”

2. “Risk Factors—Risks Related to Our Business—Reductions in Medicare reimbursement rates or changes in the rules governing the Medicare program could have a material adverse effect on our financial condition and results of operations,”

3. “Risk Factors—Risks Related to Our Business—Security breaches, loss of data and other disruptions could compromise sensitive information related to our business or our patients, or prevent us from accessing critical information and expose us to liability, which could adversely affect our business and our reputation,”

4. “Risk Factors—Risks Related to Our Business—We may be subject to legal proceedings and litigation, including intellectual property and privacy disputes, which are costly to defend and could materially harm our business and results of operations,”

5. “Risk Factors—Risks Related to Our Business—Reductions in the quality ratings of the health plans we serve could have a material adverse effect on our business, results of operations, financial condition and cash flows,”

6. “Risk Factors—Risks Related to Our Business—Our records and submissions to a health plan may contain inaccurate or unsupportable information regarding risk adjustment scores of members, which could cause us to overstate or understate our revenue and subject us to various penalties,”

7. “Risk Factors—Risks Related to Our Business—State and federal efforts to reduce Medicaid spending could adversely affect our financial condition and results of operations,”

8. “Risk Factors—Risks Related to Regulation—If we fail to adhere to all of the complex government laws and regulations that apply to our business, we could suffer severe consequences that could have a material adverse effect on our business, results of operations, financial condition, cash flows, reputation and stock price,”

9. “Risk Factors—Risks Related to Regulation—If we are unable to effectively adapt to changes in the healthcare industry, including changes to laws and regulations regarding or affecting the U.S. healthcare reform, our business may be harmed,”

Annex D-1-3

10. “Risk Factors—Risks Related to Regulation—Our use, disclosure, and other processing of personally identifiable information, including health information, is subject to HIPAA and other federal and state privacy and security regulations, and our failure to comply with those regulations or to adequately secure the information we hold could result in significant liability or reputational harm and, in turn, a material adverse effect on our patient base and revenue,”

11. “Risk Factors—Risks Related to Regulation—Laws regulating the corporate practice of medicine could restrict the manner in which we are permitted to conduct our business, and the failure to comply with such laws could subject us to penalties or require a restructuring of our business,”

12. “Risk Factors—Risks Related to Regulation—We face inspections, reviews, audits and investigations under federal and state government programs and contracts. These audits could have adverse findings that may negatively affect our business, including our results of operations, liquidity, financial condition and reputation,”

13. “Business—Regulation,” and

14. “Business—Seasonality,”

insofar as such statements summarize the Health Care Laws, fairly summarize the Health Care Laws in all material respects.

Very truly yours,

Epstein, Becker & Green, P.C.

Annex D-1-4

Exhibit A

Testing the Waters Authorization

EGC – Testing the waters authorization (to be delivered by the issuer to J.P. Morgan Securities LLC, Goldman Sachs & Co. LLC, Morgan Stanley & Co. LLC and William Blair & Company, L.L.C. in email or letter form)

In reliance on Section 5(d) of the Securities Act of 1933, as amended (the “Act”), Oak Street Health, Inc. (the “Issuer”) hereby authorizes J.P. Morgan Securities LLC (“J.P. Morgan”), Goldman Sachs & Co. LLC (“Goldman”), Morgan Stanley & Co. LLC (“MS”) and William Blair & Company, L.L.C. (“William Blair”) and their affiliates and respective employees (“Authorized Persons”), to engage on behalf of the Issuer in oral and written communications with potential investors that are “qualified institutional buyers”, as defined in Rule 144A under the Act, or institutions that are “accredited investors”, as defined in Regulation D under the Act, to determine whether such investors might have an interest in the Issuer’s contemplated initial public offering (“Testing-the-Waters Communications”). A “Written Testing-the Waters Communication” means any Testing-the-Waters Communication that is a written communication within the meaning of Rule 405 under the Act. As previously discussed, it is our and your expectation that, unless otherwise approved by the Issuer and J.P. Morgan, Goldman, MS and William Blair neither the Issuer nor any Authorized Person will send or give to any potential investor any Written Testing-the Waters Communication.

The Issuer represents that it is an “emerging growth company” as defined in Section 2(a)(19) of the Act (“Emerging Growth Company”) and agrees to promptly notify J.P. Morgan, Goldman, MS and William Blair in writing if the Issuer hereafter ceases to be an Emerging Growth Company while this authorization is in effect. If at any time following the distribution of any Written Testing-the-Waters Communication there occurs an event or development as a result of which such Written Testing-the-Waters Communication included or would include an untrue statement of a material fact or omitted or would omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances existing at that subsequent time, not misleading, the Issuer will promptly notify J.P. Morgan, Goldman, MS and William Blair and will promptly amend or supplement, at its own expense, such Written Testing-the-Waters Communication to eliminate or correct such untrue statement or omission.

Nothing in this authorization is intended to limit or otherwise affect the ability of J.P. Morgan and its affiliates and their respective employees, Goldman and its affiliates and their respective employees, MS and its affiliates and their respective employees and William Blair and its affiliates and their respective employees to engage in communications in which they could otherwise lawfully engage in the absence of this authorization, including, without limitation, any written communication containing only one or more of the statements specified under Rule 134(a) under the Act. This authorization shall remain in effect until the Issuer has provided to J.P. Morgan, Goldman, MS and William Blair a written notice revoking this authorization. All notices as described herein shall be sent by email to the attention of Tommy Rueger at tommy.rueger@jpmorgan.com, with copies to Danielle Freeman at Danielle.freeman@gs.com, Kalli Dircks at Kalli.Dircks@morganstanley.com and Steve Maletzky at smaletzky@williamblair.com.

Exhibit A-1

Exhibit B

J.P. MORGAN SECURITIES LLC

Oak Street Health, Inc.

Public Offering of Common Stock

, 20

[Name and Address of Officer or Director Requesting Waiver]

Dear Mr./Ms. [Name]:

This letter is being delivered to you in connection with the offering by Oak Street Health, Inc. (the “Company”) of shares of common stock, $0.001 par value (the “Common Stock”), of the Company and the lock-up letter dated , 20 (the “Lock-up Letter”), executed by you in connection with such offering, and your request for a [waiver] [release] dated , 20 , with respect to shares of Common Stock (the “Shares”).

J.P. Morgan Securities LLC hereby agrees to [waive] [release] the transfer restrictions set forth in the Lock-up Letter, but only with respect to the Shares, effective , 20 ; provided, however, that such [waiver] [release] is conditioned on the Company announcing the impending [waiver] [release] by press release through a major news service at least two business days before effectiveness of such [waiver] [release]. This letter will serve as notice to the Company of the impending [waiver] [release].

Except as expressly [waived] [released] hereby, the Lock-up Letter shall remain in full force and effect.

[Signature Page Follows]

Exhibit B-1


Yours very truly,

J.P. MORGAN SECURITIES LLC

By:
		Name:
		Title:

cc: Company

Exhibit B-2

Exhibit C

Form of Press Release

Oak Street Health, Inc.

[Date]

Oak Street Health, Inc. (“Company”) announced today that J.P. Morgan Securities LLC, a joint book-running manager in the Company’s recent public sale of shares of common stock, is [waiving] [releasing] a lock-up restriction with respect to shares of the Company’s common stock held by [certain officers or directors] [an officer or director] of the Company. The [waiver] [release] will take effect on , 20 , and the shares may be sold on or after such date.

This press release is not an offer for sale of the securities in the United States or in any other jurisdiction where such offer is prohibited, and such securities may not be offered or sold in the United States absent registration or an exemption from registration under the United States Securities Act of 1933, as amended.

Exhibit C-1

Exhibit D

FORM OF LOCK-UP AGREEMENT

, 20

J.P. MORGAN SECURITIES LLC

Goldman Sachs & Co. LLC

As Representatives of

the several Underwriters listed in

Schedule 1 to the Underwriting

Agreement referred to below

c/o J.P. Morgan Securities LLC

383 Madison Avenue

New York, NY 10179

c/o Goldman Sachs & Co. LLC

200 West Street

New York, NY 10282

Re:

Oak Street Health, Inc.— Public Offering

Ladies and Gentlemen:

The undersigned understands that you, as Representatives of the several Underwriters, propose to enter into an underwriting agreement (the “Underwriting Agreement”) with Oak Street Health, Inc., a Delaware corporation (the “Company”), Oak Street Health, LLC, a Delaware limited liability company, providing for the public offering (the “Public Offering”) by the several Underwriters named in Schedule 1 to the Underwriting Agreement (the “Underwriters”), of common stock, par value $0.001 per share, of the Company (the “Securities”). Capitalized terms used herein and not otherwise defined shall have the meanings set forth in the Underwriting Agreement.

In consideration of the Underwriters’ agreement to purchase and make the Public Offering of the Securities, and for other good and valuable consideration receipt of which is hereby acknowledged, the undersigned hereby agrees that, without the prior written consent of J.P. Morgan Securities LLC on behalf of the Underwriters, the undersigned will not, and will not cause any direct or indirect affiliate to, during the period beginning on the date of this letter agreement (this “Letter Agreement”) and ending at the close of business 180 days after the date of the final prospectus relating to the Public Offering (the “Prospectus”) (such period, the

Exhibit D-1

“Restricted Period”), (1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of common stock, par value $0.001 per share, of the Company (the “Common Stock”) or any securities convertible into or exercisable or exchangeable for Common Stock (including without limitation, Common Stock or such other securities which may be deemed to be beneficially owned by the undersigned in accordance with the rules and regulations of the Securities and Exchange Commission and securities which may be issued upon exercise of a stock option or warrant) (collectively with the Common Stock, the “Lock-Up Securities”), or publicly disclose the intention to undertake any of the foregoing, (2) enter into any hedging, swap or other agreement or transaction that transfers, in whole or in part, any of the economic consequences of ownership of the Lock-Up Securities, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or any other Lock-Up Securities, in cash or otherwise or (3) make any demand for or exercise any right with respect to the registration of any Lock-Up Securities, or publicly disclose the intention to do any of the foregoing, provided that, for the avoidance of doubt, to the extent the undersigned has demand and/or piggyback registration rights, the foregoing shall not prohibit the undersigned from notifying the Company privately that it is or will be exercising its demand and/or piggyback registration rights following the expiration of the Restricted Period and undertaking preparations related thereto, including the confidential submission of a registration statement with the SEC. The undersigned acknowledges and agrees that the foregoing precludes the undersigned from engaging in any hedging or other transactions or arrangements (including, without limitation, any short sale or the purchase or sale of, or entry into, any put or call option, or combination thereof, forward, swap or any other derivative transaction or instrument, however described or defined) designed or intended, or which could reasonably be expected to lead to or result in, a sale or disposition (whether by the undersigned or someone other than the undersigned) or transfer of any economic consequences of ownership, in whole or in part, directly or indirectly, of any Lock-Up Securities, whether any such transaction or arrangement (or instrument provided for thereunder) would be settled by delivery of Common Stock or other securities, in cash or otherwise. The undersigned further confirms that it has furnished J.P. Morgan Securities LLC and Goldman Sachs & Co. LLC with the details of any transaction the undersigned, or any of its affiliates, is a party to as of the date hereof, which transaction would have been restricted by this Letter Agreement if it had been entered into by the undersigned during the Restricted Period.

Notwithstanding the foregoing, the terms of this Letter Agreement shall not apply to or prohibit:

(A) the Securities to be sold by the undersigned, or any of its affiliates, pursuant to the Underwriting Agreement and any reclassification, conversion or exchange in connection with such sale of Securities;

(B) transfers of shares of Common Stock or any securities convertible into or exercisable or exchangeable for shares of Common Stock (i) as a bona fide gift or gifts, (ii) to any immediate family member of the undersigned, or any of its affiliates, or any trust for the direct or indirect benefit of the undersigned, or any of its affiliates, or any immediate family member of the undersigned (for purposes of this Letter Agreement, “immediate family” shall mean any

Exhibit D-2

relationship by blood, marriage or adoption, not more remote than first cousin); (iii) to a corporation, partnership, limited liability company, trust or other entity of which the undersigned, or any of its affiliates, and the immediate family of the undersigned are the legal and beneficial owner of all of the outstanding equity securities or similar interests; or (iv) to a nominee or custodian of a person or entity to whom a disposition or transfer would be permissible under clauses (i) through (iii) above;

(C) if the undersigned is a corporation, partnership, limited liability company or other business entity, transfers or distributions of shares of Common Stock or any securities convertible into or exercisable or exchangeable for shares of Common Stock to (i) its limited or general partners, members or stockholders or (ii) its affiliates or other entities controlled or managed by the undersigned or any of its affiliates (other than the Company and its subsidiaries);

(D) the transfer or disposition of any shares of Common Stock purchased by the undersigned, or any of its affiliates, on the open market following the Public Offering;

(E) the entering into by the undersigned, or any of its affiliates, of a written trading plan (“Rule 10b5-1 Plan”) pursuant to Rule 10b5-1 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) during the Restricted Period, provided that no sales or transfers of shares of the undersigned’s, or any of its affiliates’, Common Stock shall be made pursuant to such Rule 10b5-1 Plan prior to the expiration of the Restricted Period and no such filing under the Exchange Act or other public announcement shall be required or voluntarily made by the undersigned or any other person in connection therewith without the permission of the Representatives, prior to the expiration of the Restricted Period;

(F) transfer of shares of Common Stock pursuant to a bona fide third-party tender offer, merger, consolidation or other similar transaction made to all or substantially all holders of the Company’s capital stock involving a change of control of the Company (for the purposes of this Letter Agreement, “change of control” shall mean any bona fide third party tender offer, merger, consolidation or other similar transaction approved by the board of directors of the Company the result of which is that any “person” (as defined in Section 13(d)(3) of the Exchange Act), or group of persons, shall become, after the closing of the transaction, the beneficial owner (as defined in Rules 13d-3 and 13d-5 of the Exchange Act) of more than 50% of the total voting power of the voting securities of the Company), provided that in the event that such tender offer, merger, consolidation or other such transaction is not completed, the undersigned’s shares of Common Stock shall remain subject to the provisions of this Letter Agreement during the Restricted Period;

(G) (i) as a result of the operation of law, or pursuant to an order of a court (including a domestic order, divorce settlement, divorce decree or separation agreement) or regulatory agency or (ii) by will, other testamentary document or intestate succession;

(H) the repurchase of the Common Stock or such other securities by the Company pursuant to equity award agreements or other contractual arrangements providing for the right of said repurchase in connection with the termination of the undersigned’s employment or service with the Company; and

Exhibit D-3

(I) to the Company (a) pursuant to the exercise, on a “cashless” or “net exercise” basis, of any option to purchase Securities granted by the Company pursuant to stock option or incentive plans described in the Prospectus, or (b) for the purpose of satisfying any withholding taxes (including estimated taxes) due as a result of the exercise of any option to purchase Securities or the vesting of any awards granted by the Company pursuant to stock option or incentive plans described in the Prospectus;

provided that in the case of any transfer or distribution pursuant to clause (B) or (C), each donee or distributee shall execute and deliver to the Representatives a lock-up letter in the form of this Letter Agreement and such transfer or distribution shall not involve a disposition for value; provided, further, that in the case of any transfer or distribution pursuant to clause (B), no filing by any party (donor, donee, transferor or transferee) under the Exchange Act or other public announcement shall be required or shall be made voluntarily in connection with such transfer or distribution and if the undersigned is required to file a report under the Exchange Act in connection with such transfer during the Restricted Period, the undersigned shall include a statement in such report to the effect that the filing relates to a bona fide gift or that such transfer or other disposition of shares of Common Stock, as applicable, or any security convertible into Common Stock, is to an immediate family member, an entity of which the undersigned and the immediate family of the undersigned are the legal and beneficial owner of all of the outstanding equity securities or similar interests, or a nominee or custodian of an immediate family member or such entity, and not a disposition for value; and provided, further, that in the case of any transfer pursuant to clause (C), no filing by the undersigned or any party (transferor or transferee) under the Exchange Act, or other public announcement, shall be voluntarily made in connection with any such transfer, and if the undersigned is required to file a report under the Exchange Act in connection with such transfer during the Restricted Period, the undersigned shall include a statement in such report to the effect that the filing relates to a transfer or other disposition of shares of Common Stock, as applicable, or any security convertible into Common Stock, to such entity’s limited or general partners, members or stockholders or its affiliates or other entities controlled or managed by the undersigned, and not a disposition for value; and provided, further, that in the case of any transfer pursuant to clause (D), no filing by the undersigned or any party (transferor or transferee) under the Exchange Act, or other public announcement, shall be voluntarily made in connection with any such transfer, and if the undersigned is required to file a report under the Exchange Act in connection with such transfer during the Restricted Period, the undersigned shall include a statement in such report to the effect that the filing relates to the transfer or disposition of any shares of Common Stock purchased by the undersigned, or any of its affiliates, on the open market following the Public Offering; and provided, further, that in the case of any transfer or distribution pursuant to clause (G), no filing by the undersigned or any party (transferor or transferee) under the Exchange Act, or other public announcement, shall be voluntarily made in connection with any such transfer, and if the undersigned is required to file a report under the Exchange Act related thereto during the Restricted Period, such report shall disclose that such transfer was as a result of the operation of law, or pursuant to an order of a court or regulatory agency or by will, other testamentary document or intestate succession; and provided, further, that in the case of any transfer pursuant to clause (H), no filing by the undersigned under the Exchange Act, or other public announcement, shall be voluntarily made in connection with any such transfer, and if the

Exhibit D-4

undersigned is required to file a report under the Exchange Act related thereto during the Restricted Period, such report shall disclose that such transfer was a result of the repurchase of the Common Stock or such other securities by the Company pursuant to equity award agreements or other contractual arrangements in connection with the termination of the undersigned’s employment or service with the Company; and provided, further, that in the case of any transfer pursuant to clause (I), no filing by the undersigned or any party (transferor or transferee) under the Exchange Act under the Exchange Act, or other public announcement, shall be voluntarily made in connection with any such transfer, and if the undersigned is required to file a report under the Exchange Act related thereto during the Restricted Period, such report shall disclose that such transfer was a result of the exercise, on a “cashless” or “net exercise” basis, of any option to purchase Securities granted by the Company pursuant to stock option or incentive plans described in the Prospectus, or for the purpose of satisfying any withholding taxes (including estimated taxes) due as a result of the exercise of any option to purchase Securities or the vesting of any awards granted by the Company pursuant to stock option or incentive plans described in the Prospectus. If the undersigned is an officer or director of the Company, the undersigned further agrees that the foregoing provisions shall be equally applicable to any Company-directed Securities the undersigned may purchase in the Public Offering.

If the undersigned is an officer or director of the Company, (i) J.P. Morgan Securities LLC on behalf of the Underwriters agrees that, at least three business days before the effective date of any release or waiver of the foregoing restrictions in connection with a transfer of Lock-Up Securities, J.P. Morgan Securities LLC on behalf of the Underwriters will notify the Company of the impending release or waiver, and (ii) the Company has agreed in the Underwriting Agreement to announce the impending release or waiver by press release through a major news service at least two business days before the effective date of the release or waiver. Any release or waiver granted by J.P. Morgan Securities LLC on behalf of the Underwriters hereunder to any such officer or director shall only be effective two business days after the publication date of such press release. The provisions of this paragraph will not apply if (a) the release or waiver is effected solely to permit a transfer not for consideration and (b) the transferee has agreed in writing to be bound by the same terms described in this letter to the extent and for the duration that such terms remain in effect at the time of the transfer.

If J.P. Morgan Securities LLC on behalf of the Underwriters waives or terminates any of the restrictions with respect to any Lock-Up Securities, the restrictions on any Lock-Up Securities held by the undersigned, or any of its affiliates, shall be automatically and concurrently waived or terminated, as applicable, to the same extent and on the same terms. The provisions of this paragraph will not apply if (i) (a) the release or waiver is effected solely to permit a transfer not for consideration and (b) the transferee has agreed in writing to be bound by the same terms described in this letter to the extent and for the duration that such terms remain in effect at the time of the transfer or (ii) the aggregate number of shares of Common Stock affected by such releases or waivers (whether in one or multiple releases or waivers) is less than or equal to 1% of the total number of outstanding shares of Common Stock (assuming a conversion of all preferred shares of the Company into shares of Common Stock and calculated as of the date of such release or waiver). The Representatives shall use commercially reasonable efforts to notify the Company, which shall then notify the undersigned, of any such release described in this

Exhibit D-5

paragraph within two business days before the effective date of any such release or waiver (provided that, in the absence of bad faith, the failure to provide such notices shall not give rise to any claim or liability against the Company, the Representatives or the Underwriters).

In furtherance of the foregoing, the Company, and any duly appointed transfer agent for the registration or transfer of the securities described herein, are hereby authorized to decline to make any transfer of securities if such transfer would constitute a violation or breach of this Letter Agreement.

The undersigned hereby represents and warrants that the undersigned has full power and authority to enter into this Letter Agreement. All authority herein conferred or agreed to be conferred and any obligations of the undersigned shall be binding upon the successors, assigns, heirs or personal representatives of the undersigned.

The undersigned acknowledges and agrees that the Underwriters have not provided any recommendation or investment advice nor have the Underwriters solicited any action from the undersigned with respect to the Public Offering of the Securities and the undersigned has consulted their own legal, accounting, financial, regulatory and tax advisors to the extent deemed appropriate. The undersigned further acknowledges and agrees that, although the Representatives may be required or choose to provide certain Regulation Best Interest and Form CRS disclosures to you in connection with the Public Offering, the Representatives and the other Underwriters are not making a recommendation to you to participate in the Public Offering, enter into this Letter Agreement, or sell any Shares at the price determined in the Public Offering, and nothing set forth in such disclosures is intended to suggest that the Representatives or any Underwriter is making such a recommendation.

This Letter Agreement shall automatically terminate and be of no further effect upon the earliest to occur, if any, of: (i) the date of the filing with the SEC of a notice of withdrawal of the Registration Statement on Form S-1 (which covers the Securities) pursuant to Rule 477 promulgated under the Securities Act of 1933, as amended, (ii) the Company advises J.P. Morgan Securities LLC and Goldman Sachs & Co. LLC in writing prior to the execution of the Underwriting Agreement that it has determined not to proceed with the Public Offering, (iii) the Underwriting Agreement is executed but is terminated (other than the provisions thereof that survive termination) prior to payment for and delivery of the Shares to be sold thereunder, and (iv) September 30, 2020, in the event that the Underwriting Agreement has not been executed on or before that date. The undersigned understands that the Underwriters are entering into the Underwriting Agreement and proceeding with the Public Offering in reliance upon this Letter Agreement.

Exhibit D-6

This Letter Agreement and any claim, controversy or dispute arising under or related to this Letter Agreement shall be governed by and construed in accordance with the laws of the State of New York.


Very truly yours,

[NAME OF STOCKHOLDER]

By:
		Name: Title:

Exhibit D-7

Oak Street Health (OSH) 8-KOak Street Health Announces Closing of Initial Public Offering and Full Exercise of the Underwriters’ Option to Purchase Additional Shares