Phillips 66 S-3ASR Automatic shelf registration

Exhibit 5.1

July 29, 2022

Phillips 66

Phillips 66 Company

2331 CityWest Blvd.

Houston, Texas 77042

Ladies and Gentlemen:

We have acted as counsel to Phillips 66, a Delaware corporation (“Phillips 66”), and Phillips 66 Company, a Delaware corporation (“Phillips 66 Company”), in connection with the preparation of a Registration Statement on Form S-3 (the “Registration Statement”) to be filed on the date hereof by Phillips 66 and Phillips 66 Company with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Act”), relating to the offering of securities that may be issued and sold by Phillips 66 and Phillips 66 Company from time to time pursuant to Rule 415 under the Act. Such securities include (a) Phillips 66’s unsecured senior debt securities (the “Phillips 66 Senior Debt Securities”) guaranteed by Phillips 66 Company (the “Phillips 66 Company Senior Debt Guarantees”); (b) Phillips 66’s unsecured subordinated debt securities (the “Subordinated Debt Securities” and, together with the Phillips 66 Senior Debt Securities, the “Phillips 66 Debt Securities”); (c) Phillips 66 Company’s unsecured senior debt securities (the “Phillips 66 Company Senior Debt Securities” and, together with the Phillips 66 Senior Debt Securities, the “Senior Debt Securities”) guaranteed by Phillips 66 (the “Phillips 66 Senior Debt Guarantees” and, together with the Phillips 66 Company Senior Debt Guarantees, the “Senior Debt Guarantees”); (d) shares of common stock, par value $0.01 per share, of Phillips 66 (“Common Stock”); (e) shares of preferred stock, par value $0.01 per share, of Phillips 66 (“Preferred Stock”); (f) warrants of Phillips 66 to purchase other securities (“Warrants”); (g) depositary shares representing Preferred Stock (“Depositary Shares”); (h) stock purchase contracts of Phillips 66 (“Stock Purchase Contracts”); and (i) stock purchase units of Phillips 66, consisting of (1) a Stock Purchase Contract and (2) a beneficial interest in Phillips 66 Senior Debt Securities, Subordinated Debt Securities or debt obligations of third parties securing the holder’s obligation to purchase Common Stock or Preferred Stock under the Stock Purchase Contracts (“Stock Purchase Units”). The Senior Debt Securities and the Subordinated Debt Securities are collectively referred to herein as the “Debt Securities.” The Debt Securities, Senior Debt Guarantees, Common Stock, Preferred Stock, Warrants, Depositary Shares, Stock Purchase Contracts and Stock Purchase Units are collectively referred to herein as the “Securities.” At your request, this opinion is being furnished to you for filing as Exhibit 5.1 to the Registration Statement.

Bracewell LLP             T: +1.713.223.2300       F: +1.800.404.3970
711 Louisiana Street, Suite 2300, Houston, Texas 77002-2770
bracewell.com

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Phillips 66

July 29, 2022

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Each series of Phillips 66 Senior Debt Securities and the related Phillips 66 Company Senior Debt Guarantees are to be issued pursuant to an indenture, dated as of April 9, 2020 (the “Phillips 66 Senior Indenture”), among Phillips 66, as issuer, Phillips 66 Company, as guarantor, and U.S. Bank Trust Company, National Association, as trustee; and each series of Subordinated Debt Securities is to be issued pursuant to an indenture to be entered into between Phillips 66, as issuer, and U.S. Bank Trust Company, National Association, as trustee (the “Subordinated Indenture”). Each series of Phillips 66 Company Senior Debt Securities and the related Phillips 66 Senior Debt Guarantees are to be issued pursuant to an indenture, dated as of May 5, 2022 (the “Phillips 66 Company Senior Indenture” and, together with the Phillips 66 Senior Indenture, the “Senior Indentures,” with the Senior Indentures together with the Subordinated Indenture being referred to herein as the “Indentures”), among Phillips 66 Company, as issuer, Phillips 66, as guarantor, and U.S. Bank Trust Company, National Association, as trustee. Each Indenture is to be supplemented, in connection with the issuance of each such series, by a supplemental indenture, officers’ certificate or other writing thereunder establishing the form and terms of such series.

We have examined originals, or copies certified or otherwise identified, of (i) the Registration Statement and the form of prospectus contained therein, (ii) Phillips 66’s Amended and Restated Certificate of Incorporation and Amended and Restated By-laws and Phillips 66 Company’s Certificate of Incorporation and By-laws, in each case as amended to date (the “Charter Documents” of such entity), (iii) the Phillips 66 Senior Indenture, (iv) the form of Subordinated Indenture (in the form to be filed as an exhibit to the Registration Statement), (v) the Phillips 66 Company Senior Indenture, (vi) corporate records of Phillips 66 and Phillips 66 Company, including minute books of Phillips 66 and Phillips 66 Company and certain resolutions of the Board of Directors, or committees thereof, of Phillips 66 and Phillips 66 Company, as furnished to us by them and (vii) such other instruments, documents and records as we have deemed necessary and relevant for the purposes hereof. We have relied upon certificates of officers of Phillips 66 and Phillips 66 Company and of public officials as to certain matters of fact relating to this opinion and have made such investigations of law as we have deemed necessary and relevant as a basis hereof. In such examinations, we have assumed the legal capacity of all natural persons, the genuineness of all signatures, the authenticity of all documents, certificates and records submitted to us as originals, the conformity to authentic original documents, certificates and records of all documents, certificates and records submitted to us as copies, and the truthfulness of all statements of fact contained therein. In making our examination of executed documents or documents to be executed, we have assumed that they constitute or will constitute valid, binding and enforceable obligations of all parties thereto other than Phillips 66 and Phillips 66 Company.

In connection with this opinion, we have assumed that:

(a) the Registration Statement and any amendments thereto (including post-effective amendments) will have become effective under the Act and such effectiveness shall not have been terminated or rescinded;

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Phillips 66

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(b) a prospectus supplement describing the Securities offered thereby will have been prepared and filed with the Commission in compliance with the Act and the Commission’s rules and regulations thereunder;

(c) all Securities will be offered, issued and sold in compliance with applicable securities laws and in the manner stated in the Registration Statement and the applicable prospectus supplement;

(d) the Board of Directors of Phillips 66 and, if applicable, Phillips 66 Company or, to the extent permitted by the General Corporation Law of the State of Delaware and the Charter Documents of Phillips 66 and, if applicable, Phillips 66 Company, a duly constituted and acting committee thereof (such Board of Directors of Phillips 66 or Phillips 66 Company or committee thereof being hereinafter referred to as the “Board” of such entity) will have taken all necessary corporate action to authorize the issuance of the Securities and any other Securities issuable on the conversion, exchange, redemption or exercise thereof, and to authorize the terms of the offering and sale of such Securities and related matters;

(e) a definitive purchase, underwriting or similar agreement with respect to any Securities offered will have been duly authorized and validly executed and delivered by Phillips 66, Phillips 66 Company, as applicable, and the other parties thereto (the “Purchase Agreement”);

(f) any securities issuable upon conversion, exchange, redemption or exercise of any Securities being offered will have been duly authorized, created and, if appropriate, reserved for issuance upon such conversion, exchange, redemption or exercise;

(g) all Securities, and any certificates or Receipts (as defined below) in respect thereof, will be delivered either (i) in accordance with the provisions of the applicable Purchase Agreement approved by the Board of Phillips 66 or Phillips 66 Company, as applicable, upon payment of the consideration therefor provided for therein or (ii) upon conversion, exchange, redemption or exercise of any other Security, in accordance with the terms of such Security or the instrument governing such Security providing for such conversion, exchange, redemption or exercise as approved by the Board of Phillips 66 or Phillips 66 Company, as applicable, for the consideration approved by such Board;

(h) in the case of shares of Common Stock or Preferred Stock, certificates representing such shares will have been duly executed, countersigned, registered and delivered, or if uncertificated, valid book-entry notations will have been made in the share register of Phillips 66, in each case in accordance with the provisions of the Charter Documents of Phillips 66; there will be sufficient shares of Common Stock or Preferred Stock authorized under such Charter Documents and not otherwise issued or reserved for issuance; and the purchase price therefor payable to Phillips 66 or, if such shares are issuable on the conversion, exchange, redemption or exercise of another Security, the consideration

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Phillips 66

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payable to Phillips 66 for such conversion, exchange, redemption or exercise will not be less than the par value of such shares, in the case of shares of Common Stock, or the lesser of such purchase price or such consideration, as the case may be, or the amount of such purchase price or such consideration, as the case may be, timely determined by the Board of Phillips 66 to constitute the stated capital applicable to such shares, in the case of shares of Preferred Stock;

(i) in the case of shares of Preferred Stock of any series, the Board of Phillips 66 will have taken all necessary corporate action to designate and establish the terms of such series and will have caused a certificate of designations respecting such series and conforming to Phillips 66’s Certificate of Incorporation and By-laws and the Delaware General Corporation Law to be prepared and filed with the Secretary of State of the State of Delaware;

(j) in the case of Warrants, the Board of Phillips 66 will have taken all necessary corporate action to authorize the creation of and the terms of such Warrants and the issuance of the Securities to be issued pursuant thereto and to approve the warrant agreement relating thereto; such warrant agreement will have been duly executed and delivered by Phillips 66 and the warrant agent thereunder appointed by Phillips 66; neither such Warrants nor such warrant agreement will include any provision that is unenforceable; and such Warrants or certificates representing such Warrants will have been duly executed, countersigned, registered and delivered in accordance with the provisions of such warrant agreement and the applicable definitive purchase, underwriting or similar agreement approved by the Board upon payment of the consideration therefor provided for therein;

(k) in the case of Depositary Shares, the Board of Phillips 66 will have taken all necessary corporate action to establish the terms of the Depositary Shares; the action with respect to the Preferred Stock underlying such Depositary Shares referred to in paragraph (i) above will have been taken; a depositary agreement (the “Depositary Agreement”) relating to the Depositary Shares and the related depositary receipts evidencing such Depositary Shares (“Receipts”) will have been duly authorized and validly executed and delivered by Phillips 66 and a bank or trust company to be selected by Phillips 66, as depositary (the “Depositary”), and such Depositary Agreement and such Receipts will not include any provision that is unenforceable; the shares of Preferred Stock underlying such Depositary Shares will have been deposited with the Depositary under the applicable Depositary Agreement; and the Depositary Receipts will have been duly executed, countersigned, registered and delivered in accordance with the applicable Depositary Agreement and the applicable definitive purchase, underwriting or similar agreement approved by the Board of Phillips 66 upon payment of the consideration therefor provided for therein;

(l) in the case of a series of Senior Debt Securities, the trustee is qualified to act as trustee under the Senior Indenture under which such Senior Debt Securities will be issued;

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Phillips 66

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(m) in the case of a series of Subordinated Debt Securities, the trustee is qualified to act as trustee under the Subordinated Indenture under which such Subordinated Debt Securities will be issued and an indenture substantially in the form of such Subordinated Indenture will have been duly executed and delivered by Phillips 66 and the trustee thereunder;

(n) in the case of a series of Debt Securities issuable under an Indenture:

• the Board of Phillips 66 or Phillips 66 Company, as applicable, will have taken all necessary corporate action to designate and establish the terms of such Debt Securities in accordance with the terms of the Indenture under which such Debt Securities will be issued, and such Debt Securities will not include any provision that is unenforceable;

• the Indenture under which such Debt Securities will be issued will have become qualified under the Trust Indenture Act of 1939, as amended, and such qualification shall not have been terminated or rescinded; and

• forms of Debt Securities, including, if applicable, the related Senior Debt Guarantees, complying with the terms of the Indenture under which such Debt Securities will be issued and evidencing such Debt Securities and, if applicable, the related Senior Debt Guarantees will have been duly executed, authenticated, issued and delivered in accordance with the provisions of such Indenture and the applicable definitive Purchase Agreement approved by the Board of Phillips 66 or Phillips 66 Company, as applicable, upon payment of the consideration therefor provided for therein;

(o) in the case of Stock Purchase Contracts, the Board of Phillips 66 will have taken all necessary corporate action to establish the terms thereof and to approve the purchase contract agreement relating thereto; such Stock Purchase Contracts and purchase contract agreement will have been duly executed and delivered by the parties thereto; and neither such Stock Purchase Contracts nor such purchase contract agreement will include any provision that is unenforceable;

(p) in the case of Stock Purchase Units, the Board of Phillips 66 will have taken all necessary corporate action to establish the terms of such Stock Purchase Units and the terms of the Securities, if any, such Stock Purchase Units include; the action with respect to the Stock Purchase Contracts included in such Stock Purchase Units referred to in paragraph (n) above will have been taken; if such Stock Purchase Units include securities other than Securities, such other securities will have been duly and validly executed, issued and delivered by the issuer thereof and will be valid and legally binding obligations of such issuer, enforceable against such issuer in accordance with their respective terms; and no agreement or other instrument establishing such Stock Purchase Units or defining the rights of the holders of such Stock Purchase Units will contain any provision that is unenforceable; and

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Phillips 66

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(q) all necessary actions shall be taken by Phillips 66 and Phillips 66 Company so as not to violate any applicable law or result in a default under or breach of any agreement or instrument binding upon Phillips 66 and Phillips 66 Company and so as to comply with any requirement or restriction imposed by any court or governmental body having jurisdiction over Phillips 66 and Phillips 66 Company.

On the basis of the foregoing, and subject to the assumptions, limitations and qualifications set forth herein, we are of the opinion that:

1. The shares of Common Stock and Preferred Stock included in the Securities will, when issued, have been validly issued and will be fully paid and nonassessable.

2. The Warrants and the Depositary Shares included in the Securities will, when issued, have been validly issued and constitute valid and legally binding obligations of Phillips 66, enforceable against Phillips 66 in accordance with their respective terms.

3. The Phillips 66 Debt Securities, Stock Purchase Contracts and Stock Purchase Units included in the Securities will, when issued, constitute valid and legally binding obligations of Phillips 66, enforceable against Phillips 66 in accordance with their respective terms.

4. The Phillips 66 Company Senior Debt Securities included in the Securities will, when issued, constitute valid and legally binding obligations of Phillips 66 Company, enforceable against Phillips 66 Company in accordance with their respective terms.

5. Each Phillips 66 Company Senior Debt Guarantee relating to any Phillips 66 Senior Debt Securities included in the Securities will, when issued, constitute a valid and legally binding obligation of Phillips 66 Company, enforceable against Phillips 66 Company in accordance with its terms.

6. Each Phillips 66 Senior Debt Guarantee relating to any Phillips 66 Company Senior Debt Securities included in the Securities will, when issued, constitute a valid and legally binding obligation of Phillips 66, enforceable against Phillips 66 in accordance with its terms.

The foregoing opinion is based on and is limited to the General Corporation Law of the State of Delaware and the relevant contract law of the State of New York. We express no opinion as to any other laws, statutes, regulations or ordinances, including federal and state securities (or “blue sky”) laws. We are not admitted to practice law in the State of Delaware.

Our opinion that any document or Security is a valid and legally binding obligation of Phillips 66 or Phillips 66 Company is subject to (i) applicable bankruptcy, insolvency, reorganization, arrangement, fraudulent conveyance, moratorium or other similar laws relating to or affecting the rights of creditors generally, (ii) general principles of equity, including without limitation concepts of

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Phillips 66

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materiality, reasonableness, good faith and fair dealing, and the possible unavailability of specific performance or injunctive relief and limitation of rights of acceleration, regardless of whether such enforceability is considered in a proceeding in equity or at law and (iii) limitations of rights to indemnification, exculpation and contribution which may be limited by applicable law or equitable principles. We also express no opinion regarding the effectiveness of any waiver of stay, extension or usury laws or of unknown future rights, and we express no opinion regarding severability provisions.

You have informed us that Phillips 66 and Phillips 66 Company intend to issue Securities from time to time on a delayed or continuous basis. This opinion is limited to the laws referred to above as in effect on the date hereof. We understand that prior to issuing any Securities pursuant to the Registration Statement (i) you will advise us in writing of the terms thereof and (ii) you will afford us an opportunity to review the documents pursuant to which such Securities are to be issued or sold (including the applicable offering documents) and you will file such supplement or amendment to this opinion (if any) as we may advise you may be necessary or appropriate.

We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and to the reference to us under the heading “Validity of the Securities” in the prospectus forming a part of the Registration Statement. In giving such consent, we do not admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission.

This opinion is limited to the specific issues addressed herein, and no opinion may be inferred or implied beyond that expressly stated herein.

Very truly yours,

/s/ Bracewell LLP

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