As filed with the Securities and Exchange Commission on January 27, 2017May 12, 2020

RegistrationNo. 333-                

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FormS-3

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

CONTANGO OIL & GAS COMPANY*

(Exact name of Registrant as specified in its charter)

717 Texas Avenue, Suite 2900

Houston, Texas 77002

(713)236-7400

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

John A. Thomas

Wilkie S. Colyer, Jr.

Vice President General Counsel and Corporate SecretaryChief Executive Officer

717 Texas Avenue,Ave., Suite 2900

Houston, Texas 77002

Telephone: (713)236-7400

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

James M. PrinceHillary H. Holmes

VinsonGibson, Dunn & Elkins L.L.P.Crutcher LLP

1001 Fannin,811 Main Street, Suite 25003000

Houston, Texas 77002-676077002

(713) 758-2222

(713) 615-5962 (Fax)Telephone: (346)718-6600

Approximate date of commencement of proposed sale to the public: From time to time after the effective date of this Registration Statement becomes effective.registration statement.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box.  ☐

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box.  ☒

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ☐

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box.  ☐

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box.  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, anon-accelerated filer, or a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer” andfiler,” “smaller reporting company” and “emerging growth company” in Rule12b-2 of the Exchange Act. (Check one):

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.  ☐

CALCULATION OF REGISTRATION FEE

Each registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the registrants shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act or until the Registration Statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a) of the Securities Act, may determine.

TABLE OF CONTENTS

ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement that we filed with the SEC utilizingSecurities and Exchange Commission (the “SEC”), using a shelf“shelf” registration process. Under this shelf registration process, we may from time to time, offer and sell up to $250,000,000 in total aggregate offering price of any combination of the securities described in this prospectus in one or more offerings.offerings with a total aggregate initial offering price of up to $500,000,000. This prospectus provides you with a general description of the securities we may offer. Each time we sell securities, we will provide you with a prospectus supplement that will contain specific information about the terms of the offering and the offered securities. The prospectus supplement may also add, update or change information contained in this prospectus. Any statement that we make in this prospectus will be modified or superseded by any inconsistent statement made by us in a prospectus supplement. You should read both

We have not authorized any person to provide you with any information or represent anything about us other than what is contained in this prospectus, and any prospectus supplement togetherand any pricing supplement. We do not take any responsibility for, and can provide no assurance as to the reliability of, any information that others may provide to you. You should not assume that the information in this prospectus or any document incorporated by reference is accurate as of any date other than the date on its front cover. Our business, financial condition, results of operations and prospects may have changed since the date indicated on the front cover of such documents. This prospectus does not constitute an offer to sell or the solicitation of an offer to buy any securities other than the securities offered hereunder, nor does this prospectus constitute an offer to sell or the solicitation of an offer to buy securities in any jurisdiction to any person to whom it is unlawful to make such offer or solicitation in such jurisdiction.

Additional information, including our financial statements and the notes thereto, is incorporated in this prospectus by reference to our reports filed with additional information described under the headingSEC. Please read “Where You Can Find More Information.Information” below. You are urged to read this prospectus carefully, including “Risk Factors,” any prospectus supplement and the documents incorporated by reference in their entirety before investing in our securities.

Unless the context requires otherwise or unless otherwise noted, all references in this prospectus or any accompanying prospectus supplement to “Contango,” the “Company,” “we” or “our” are to Contango Oil & Gas Company and its subsidiaries and all references to “Crimson” are to our subsidiaries, Crimson Exploration Inc. and Crimson Exploration Operating, Inc.subsidiaries.

THE COMPANY

We are a Houston, Texas based independent oil and natural gas company.company, with regional offices in Oklahoma City and Stillwater, Oklahoma. Our business is to maximize production and cash flow from our onshore properties in Texas and Wyoming and offshore properties in the shallow waters of the Gulf of Mexico and toonshore Texas, Oklahoma, Louisiana and Wyoming properties and use that cash flow to explore, develop, exploit and acquire crude oil and natural gas properties in the onshore Texas Gulf Coast and Rocky Mountain regions ofacross the United States. We were originally formed in 1999 as a Nevada corporation and changed our state of incorporation to the State of Delaware in 2000. On June 14, 2019, following approval by our stockholders at the 2019 annual meeting of stockholders, we changed our state of incorporation from the State of Delaware to the State of Texas.

Our principal executive offices are located at 717 Texas Avenue, Suite 2900, Houston, Texas 77002, and our phone number is (713) 236-7400. Our website is located athttp://www.contango.com. We make our periodic reports and other information filed with or furnished to the SEC available, free of charge, through our website, as soon as reasonably practicable. Information contained on our website is not incorporated by reference into this prospectus, and you should not consider information contained on our website as part of this prospectus.

For additional information as to our business, properties, and financial condition, please refer to the documents cited in “Where You Can Find More Information.”

ABOUT THE SUBSIDIARY GUARANTORS

If specified in any accompanying prospectus supplement respecting a series of debt securities, Crimson Exploration Inc., Crimson Exploration Operating, Inc., Contango Resources, Inc., Contango Midstream Company, Contango Energy Company, Contango Rocky Mountain Inc., Contango Operators, Inc., Contango Mining Company, Conterra Company, Contaro Company, Contango Alta Investments, Inc., Contango Venture Capital Corporation Contango Rocky Mountain Inc. and any other of our future subsidiaries specified in any prospectus supplement (the “Subsidiary Guarantors”) may jointly and severally, fully, irrevocably and unconditionally guarantee our payment obligations under any series of debt securities offered by this prospectus. Financial information concerning our Subsidiary Guarantors andnon-guarantor subsidiaries, if any, will be included in our consolidated financial statements filed as a part of our periodic reports filed pursuant to the Exchange Act to the extent required by the rules and regulations of the SEC.

For additional information as to our and our subsidiaries’ business, properties, and financial condition, please refer to the documents cited in “Where You Can Find More Information.”

WHERE YOU CAN FIND MORE INFORMATION

We are required to file annual, quarterly and current reports, proxy statements and other information with the SEC. The SEC (File No. 001-12108) pursuantmaintains an Internet site that contains reports, proxy statements and other information about registrants, like us, that have been filed electronically with the SEC. You can access the SEC’s Internet site at http://www.sec.gov. You can also obtain information about us on our website at http://www.contango.com. Information on our website or any other website is not incorporated by reference into this prospectus and does not constitute a part of this prospectus unless specifically so designated and filed with the SEC.

We have filed a registration statement on FormS-3 with the SEC relating to the Securities Exchange Actsecurities covered by this prospectus. This prospectus is a part of 1934, as amended (the “Exchange Act”).the registration statement and does not contain all of the information in the registration statement. Whenever a reference is made in this prospectus to a contract or other document of ours, please be aware that the reference is only a summary and that you should refer to the exhibits that are part of the registration statement for a copy of the contract or other document. You may read andreview a copy any documents that are filed at the SEC’s Public Reference Room at 100 F Street, N.E., Room 1580, Washington, D.C. 20549. You may also obtain copies of these documents at prescribed rates from the Public Reference Section of the SEC at its Washington address. Please call the SEC at l-800-SEC-0330 for further information. Our filings are also available to the publicregistration statement through the SEC’s website atwww.sec.gov.Internet site.

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to “incorporate by reference” information from other documents that we file with them,it, which means that we can disclose important information to you by referring you to documents previously filed with the SEC.those documents. The information incorporated by reference is an importantconsidered to be part of this prospectus. Information in this prospectus andsupersedes information incorporated by reference that we filed with the SEC prior to the date of this prospectus, while information that we file later with the SEC will automatically update and supersede the information in this information. The followingprospectus. We incorporate by reference into this prospectus and the registration statement of which this prospectus is a part the information or documents listed below that we have filed with the SEC pursuant(other than information furnished under Item 2.02 or Item 7.01 of Form8-K and exhibits filed on such form that are related to such items unless we expressly provide to the Exchange Act are incorporated herein by reference:contrary):

In addition, weWe also incorporate by reference in this prospectus any future filings (other than information furnished under Item 2.02 or Item 7.01 of Form8-K and exhibits filed on such form that are related to such items unless we expressly provide to the contrary) made by Contango with the SEC underpursuant to Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 (the “Exchange Act”) (excluding any information furnished and not filed with the SEC) after the date on which the registration statement that includes this prospectus was initially filed with the SEC (including all such documents that we may file with the SEC after the date of the initial registration statement and prior to the effectiveness of the registration statement) and until all offerings under this shelf registration statement are terminated shallterminated. Information in such future filings updates and supplements the information provided in this prospectus. Any statements in any such future filings will automatically be deemed to be incorporated in this prospectus by referencemodify and to be a part hereof from the date of filing of such documents.

Any statement contained in a document incorporated by reference herein shall be deemed to be modified or superseded for all purposes to the extent that a statement contained in this prospectus orsupersede any information in any other subsequentlydocument we previously filed document whichwith the SEC that is also incorporated or deemed to be incorporated herein by reference modifiesto the extent that statements in the later filed document modify or supersedesreplace such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus.earlier statements.

You maycan request a copy of these filings, (other than an exhibit to a filing unless that exhibit is specifically incorporated by reference into that filing) at no cost, by writing or telephoning us at the following address andor telephone number:

Contango Oil & Gas Company

Attention: Corporate SecretaryChief Financial Officer

717 Texas Avenue, Suite 2900

Houston, Texas 77002

(713)236-7400

CAUTIONARY STATEMENTS REGARDING FORWARD-LOOKING STATEMENTS

Certain statements contained in or incorporated by reference intoin this prospectus, or filings with the SEC and our public releases may contain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. The words and phrases “should be”“should”, “will be”“could”, “may”, “will”, “believe”, “plan”, “intend”, “expect”, “potential”, “possible”, “anticipate”, “estimate”, “forecast”, “view”, “efforts”, “goal” and similar expressions identify forward-looking statements and express our expectations about future events. Although we believe the expectations reflected in such forward-looking statements are reasonable, such expectations may not occur. These forward-looking statements are made subject to certain risks and uncertainties that could cause actual results to differ materially from those stated. Risks and uncertainties that could cause or contribute to such differences include, without limitation, those discussed in the section entitled “Risk Factors” included in this prospectus and elsewhere in or incorporated by reference into this prospectus, including our Annual Report on Form10-K for the fiscal year ended December 31, 2015, our Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2016 and our subsequent SEC filings2019 and those factors summarized below:

and assumptions to be reasonable when made, they are inherently uncertain and involve a number of risks and uncertainties that are beyond our control. Our assumptions about future events may prove to be inaccurate. We caution you that the forward-looking statements contained in this prospectus are not guarantees of future performance, and we cannot assure you that those statements will be realized or the forward-looking events and circumstances will occur. AllYou should not place undue reliance on forward-looking statements in this report as they speak only as of the date of this prospectus.report.

Reserve engineering is a process of estimating underground accumulations of oil, natural gas and natural gas liquids that cannot be measured in an exact way. The accuracy of any reserve estimate depends on the quality of available data, the interpretation of such data and price and cost assumptions made by reserve engineers. In addition, the results of drilling, testing and production activities may justify revisions of estimates that were made previously. If significant, such revisions would change the schedule of any further production and development drilling. Accordingly, reserve estimates may differ significantly from the quantities of oil, natural gas and natural gas liquids that are ultimately recovered.

All forward-looking statements, expressed or implied, in this report are expressly qualified in their entirety by this cautionary statement. This cautionary statement should also be considered in connection with any subsequent written or oral forward-looking statements that we or any person acting on our behalf may issue.

We do not intend to publicly update or revise any forward-looking statements as a result of new information, future events or otherwise, except as required by law. These cautionary statements qualify all forward-looking statements attributable to us or persons acting on our behalf.

RISK FACTORS

An investmentInvesting in our securities involves risks. Before you make a high degree of risk. Youdecision to buy our securities, in addition to the risks and uncertainties discussed above under “Cautionary Note Regarding Forward-Looking Statements,” you should carefully consider the risk factors and all ofspecific risks set forth under the othercaption “Risk Factors” in any applicable prospectus supplement, as well as information included in, or incorporated by reference into, this prospectus, including those included in our most recent Annual Report on Form10-K, and, if applicable, in our any subsequently filed Quarterly Reports on Form10-Q and any subsequently filed Current Reports on Form8-K in evaluating an investment in our securities. as incorporated herein by reference. If any of these risks were toactually occur, it may materially harm our business, financial condition, orliquidity and results of operations could be adversely affected. In that case,operations. As a result, the tradingmarket price of our common stock or debt securities could decline, and you could lose all or part of your investment. When we offerAdditionally, the risks and selluncertainties described in this prospectus, any securities pursuant to a prospectus supplement or in any document incorporated by reference herein or therein are not the only risks and uncertainties that we face. Additional risks and uncertainties not presently known to us or that we currently believe to be immaterial may include additional risk factors relevant to such securities in the prospectus supplement.also adversely affect our business.

USE OF PROCEEDS

Except as may be stated in the applicable prospectus supplement, we intend to use the net proceeds we receive from any sales of securities by us under this prospectus and any accompanying prospectus supplement for general corporate purposes, which may include, among other things:

Any specific allocation of the net proceeds of an offering of securities to a specific purpose will be determined at the time of the offering and will be described in an accompanying prospectus supplement.

DESCRIPTION OF DEBT SECURITIES

The Debt Securities will be either our senior debt securities (“Senior Debt Securities”) or our subordinated debt securities (“Subordinated Debt Securities”). The Senior Debt Securities and the Subordinated Debt Securities will be issued under separate indentures among us, the Subsidiary Guarantors of such Debt Securities, if any, and a trustee to be determined (the “Trustee”). Senior Debt Securities will be issued under a “Senior Indenture” and Subordinated Debt Securities will be issued under a “Subordinated Indenture.” Together, the Senior Indenture and the Subordinated Indenture are called “Indentures.”

The Debt Securities may be issued from time to time in one or more series. The particular terms of each series that are offered by a prospectus supplement will be described in the prospectus supplement.

Unless the Debt Securities are guaranteed by our subsidiaries as described below, the rights of Contango Oil & Gas Company and our creditors, including holders of the Debt Securities, to participate in the assets of any subsidiary upon the latter’s liquidation or reorganization, will be subject to the prior claims of the subsidiary’s creditors, except to the extent that we may ourself be a creditor with recognized claims against such subsidiary.

We have summarized selected provisions of the Indentures below. The summary is not complete. The form of each Indenture has been filed with the SEC as an exhibit to the registration statement of which this prospectus is a part, and you should read the Indentures for provisions that may be important to you. Capitalized terms used in the summary have the meanings specified in the Indentures.

General

The Indentures provide that Debt Securities in separate series may be issued thereunder from time to time without limitation as to aggregate principal amount. We may specify a maximum aggregate principal amount for the Debt Securities of any series. We will determine the terms and conditions of the Debt Securities, including the maturity, principal and interest, but those terms must be consistent with the Indenture. The Debt Securities will be our unsecured obligations.

The Subordinated Debt Securities will be subordinated in right of payment to the prior payment in full of all of our Senior Debt (as defined) as described under “—Subordination of Subordinated Debt Securities” and in the prospectus supplement applicable to any Subordinated Debt Securities. If the prospectus supplement so indicates, the Debt Securities will be convertible into our common stock.

If specified in the prospectus supplement respecting a particular series of Debt Securities, Crimson Exploration Inc., Crimson Exploration Operating, Inc., Contango Resources, Inc., Contango Midstream Company, Contango Energy Company, Contango Rocky Mountain Inc., Contango Operators, Inc., Contango Mining Company, Conterra Company, Contaro Company, Contango Alta Investments, Inc., Contango Venture Capital Corporation Contango Rocky Mountain Inc. and any other of our future subsidiaries specified in the prospectus supplement (each a “Subsidiary Guarantor”) will fully and unconditionally guarantee (the “Subsidiary Guarantee”) that series as described under “—Subsidiary Guarantee” and in the prospectus supplement. Each Subsidiary Guarantee will be an unsecured obligation of the Subsidiary Guarantor. A Subsidiary Guarantee of Subordinated Debt Securities will be subordinated to the Senior Debt of the Subsidiary Guarantor on the same basis as the Subordinated Debt Securities are subordinated to our Senior Debt.

The Subsidiary Guarantors are wholly-owned by the Company, either directly or indirectly, and any guarantee by the Subsidiary Guarantors will be full and unconditional. The Company has no assets or operations independent of the Subsidiary Guarantors, and there are no significant restrictions upon the ability of the Subsidiary Guarantors to distribute funds to the Company. The Company has one other wholly-owned subsidiary that is inactive. Finally, the Company’s wholly-owned subsidiaries do not have restricted assets that exceed 25% of net assets as of the most recent fiscal year end that may not be transferred to the Company in the form of loans, advances or cash dividends by such subsidiary without the consent of a third party.

The applicable prospectus supplement will set forth the price or prices at which the Debt Securities to be issued will be offered for sale and will describe the following terms of such Debt Securities:

Debt Securities, including any Debt Securities that provide for an amount less than the principal amount thereof to be due and payable upon a declaration of acceleration of the Maturity thereof (“Original Issue Discount Securities”), may be sold at a substantial discount below their principal amount. Special United States federal income tax considerations applicable to Debt Securities sold at an original issue discount may be described in the applicable prospectus supplement. In addition, special United States federal income tax or other considerations applicable to any Debt Securities that are denominated in a currency or currency unit other than United States dollars may be described in the applicable prospectus supplement.

Subordination of Subordinated Debt Securities

The indebtedness evidenced by the Subordinated Debt Securities will, to the extent set forth in the Subordinated Indenture with respect to each series of Subordinated Debt Securities, be subordinated in right of payment to the prior payment in full of all of our Senior Debt, including the Senior Debt Securities, and it may also be senior in right of payment to all of our Subordinated Debt. The prospectus supplement relating to any Subordinated Debt Securities will summarize the subordination provisions of the Subordinated Indenture applicable to that series including:

The failure to make any payment on any of the Subordinated Debt Securities by reason of the subordination provisions of the Subordinated Indenture described in the prospectus supplement will not be construed as preventing the occurrence of an Event of Default with respect to the Subordinated Debt Securities arising from any such failure to make payment.

The subordination provisions described above will not be applicable to payments in respect of the Subordinated Debt Securities from a defeasance trust established in connection with any legal defeasance or covenant defeasance of the Subordinated Debt Securities as described under “—Legal Defeasance and Covenant Defeasance.”

Subsidiary Guarantee

If specified in the prospectus supplement, one or more of the Subsidiary Guarantors will guarantee the Debt Securities of a series. Unless otherwise indicated in the prospectus supplement, the following provisions will apply to the Subsidiary Guarantee of the Subsidiary Guarantors.

Subject to the limitations described below and in the prospectus supplement, one or more of the Subsidiary Guarantors will jointly and severally, fully and unconditionally guarantee the punctual payment when due, whether at Stated Maturity, by acceleration or otherwise, of all our payment obligations under the Indentures and the Debt Securities of a series, whether for principal of, premium, if any, or interest on the Debt Securities or otherwise (all such obligations guaranteed by a Subsidiary Guarantor being herein called the “Guaranteed Obligations”). The Subsidiary Guarantors will also pay all expenses (including reasonable counsel fees and expenses) incurred by the applicable Trustee in enforcing any rights under a Subsidiary Guarantee with respect to a Subsidiary Guarantor.

In the case of Subordinated Debt Securities, a Subsidiary Guarantor’s Subsidiary Guarantee will be subordinated in right of payment to the Senior Debt of such Subsidiary Guarantor on the same basis as the Subordinated Debt Securities are subordinated to our Senior Debt. No payment will be made by any Subsidiary Guarantor under its Subsidiary Guarantee during any period in which payments by us on the Subordinated Debt Securities are suspended by the subordination provisions of the Subordinated Indenture.

Each Subsidiary Guarantee will be limited in amount to an amount not to exceed the maximum amount that can be guaranteed by the relevant Subsidiary Guarantor without rendering such Subsidiary Guarantee voidable under applicable law relating to fraudulent conveyance or fraudulent transfer or similar laws affecting the rights of creditors generally.

Each Subsidiary Guarantee will be a continuing guarantee and will:

In the event that (a) a Subsidiary Guarantor ceases to be a Subsidiary, (b) either legal defeasance or covenant defeasance occurs with respect to the series or (c) all or substantially all of the assets or all of the Capital Stock of such Subsidiary Guarantor is sold, including by way of sale, merger, consolidation or otherwise, such Subsidiary Guarantor will be released and discharged of its obligations under its Subsidiary Guarantee without any further action required on the part of the Trustee or any Holder, and no other person acquiring or owning the assets or Capital Stock of such Subsidiary Guarantor will be required to enter into a Subsidiary Guarantee. In addition, the prospectus supplement may specify additional circumstances under which a Subsidiary Guarantor can be released from its Subsidiary Guarantee.

Form, Exchange and Transfer

The Debt Securities of each series will be issuable only in fully registered form, without coupons, and, unless otherwise specified in the applicable prospectus supplement, only in denominations of $1,000 and integral multiples thereof.

At the option of the Holder, subject to the terms of the applicable Indenture and the limitations applicable to Global Securities, Debt Securities of each series will be exchangeable for other Debt Securities of the same series of any authorized denomination and of a like tenor and aggregate principal amount.

Subject to the terms of the applicable Indenture and the limitations applicable to Global Securities, Debt Securities may be presented for exchange as provided above or for registration of transfer (duly endorsed or with the form of transfer endorsed thereon duly executed) at the office of the Security Registrar or at the office of any transfer agent designated by us for such purpose. No service charge will be made for any registration of transfer or exchange of Debt Securities, but we may require payment of a sum sufficient to cover any tax or other governmental charge payable in that connection. Such transfer or exchange will be effected upon the Security Registrar or such transfer agent, as the case may be, being satisfied with the documents of title and identity of the person making the request. The Security Registrar and any other transfer agent initially designated by us for any Debt Securities will be named in the applicable prospectus supplement. We may at any time designate additional transfer agents or rescind the designation of any transfer agent or approve a change in the office through which any transfer agent acts, except that we will be required to maintain a transfer agent in each Place of Payment for the Debt Securities of each series.

If the Debt Securities of any series (or of any series and specified tenor) are to be redeemed in part, we will not be required to (1) issue, register the transfer of or exchange any Debt Security of that series (or of that series and specified tenor, as the case may be) during a period beginning at the opening of business 15 days before the day of mailing of a notice of redemption of any such Debt Security that may be selected for redemption and ending at the close of business on the day of such mailing or (2) register the transfer of or exchange any Debt Security so selected for redemption, in whole or in part, except the unredeemed portion of any such Debt Security being redeemed in part.

Global Securities

Some or all of the Debt Securities of any series may be represented, in whole or in part, by one or more Global Securities that will have an aggregate principal amount equal to that of the Debt Securities they represent. Each Global Security will be registered in the name of a Depositary or its nominee identified in the applicable prospectus supplement, will be deposited with such Depositary or nominee or its custodian and will bear a legend regarding the restrictions on exchanges and registration of transfer thereof referred to below and any such other matters as may be provided for pursuant to the applicable Indenture.

Notwithstanding any provision of the Indentures or any Debt Security described in this prospectus, no Global Security may be exchanged in whole or in part for Debt Securities registered, and no transfer of a Global

Security in whole or in part may be registered, in the name of any Person other than the Depositary for such Global Security or any nominee of such Depositary unless:

All certificated Debt Securities issued in exchange for a Global Security or any portion thereof will be registered in such names as the Depositary may direct.

As long as the Depositary, or its nominee, is the registered holder of a Global Security, the Depositary or such nominee, as the case may be, will be considered the sole owner and Holder of such Global Security and the Debt Securities that it represents for all purposes under the Debt Securities and the applicable Indenture. Except in the limited circumstances referred to above, owners of beneficial interests in a Global Security will not be entitled to have such Global Security or any Debt Securities that it represents registered in their names, will not receive or be entitled to receive physical delivery of certificated Debt Securities in exchange for those interests and will not be considered to be the owners or Holders of such Global Security or any Debt Securities that is represents for any purpose under the Debt Securities or the applicable Indenture. All payments on a Global Security will be made to the Depositary or its nominee, as the case may be, as the Holder of the security. The laws of some jurisdictions may require that some purchasers of Debt Securities take physical delivery of such Debt Securities in certificated form. These laws may impair the ability to transfer beneficial interests in a Global Security.

Ownership of beneficial interests in a Global Security will be limited to institutions that have accounts with the Depositary or its nominee (“participants”) and to persons that may hold beneficial interests through participants. In connection with the issuance of any Global Security, the Depositary will credit, on its book-entry registration and transfer system, the respective principal amounts of Debt Securities represented by the Global Security to the accounts of its participants. Ownership of beneficial interests in a Global Security will be shown only on, and the transfer of those ownership interests will be effected only through, records maintained by the Depositary (with respect to participants’ interests) or any such participant (with respect to interests of Persons held by such participants on their behalf). Payments, transfers, exchanges and other matters relating to beneficial interests in a Global Security may be subject to various policies and procedures adopted by the Depositary from time to time. None of us, the Subsidiary Guarantors, the Trustees or the agents of us, the Subsidiary Guarantors or the Trustees will have any responsibility or liability for any aspect of the Depositary’s or any participant’s records relating to, or for payments made on account of, beneficial interests in a Global Security, or for maintaining, supervising or reviewing any records relating to such beneficial interests.

Payment and Paying Agents

Unless otherwise indicated in the applicable prospectus supplement, payment of interest on a Debt Security on any Interest Payment Date will be made to the Person in whose name such Debt Security (or one or more Predecessor Securities) is registered at the close of business on the Regular Record Date for such interest.

Unless otherwise indicated in the applicable prospectus supplement, principal of and any premium and interest on the Debt Securities of a particular series will be payable at the office of such Paying Agent or Paying

Agents as we may designate for such purpose from time to time, except that at our option payment of any interest on Debt Securities in certificated form may be made by check mailed to the address of the Person entitled thereto as such address appears in the Security Register. Unless otherwise indicated in the applicable prospectus supplement, the corporate trust office of the Trustee under the Senior Indenture in The City of New York will be designated as sole Paying Agent for payments with respect to Senior Debt Securities of each series, and the corporate trust office of the Trustee under the Subordinated Indenture in The City of New York will be designated as the sole Paying Agent for payment with respect to Subordinated Debt Securities of each series. Any other Paying Agents initially designated by us for the Debt Securities of a particular series will be named in the applicable prospectus supplement. We may at any time designate additional Paying Agents or rescind the designation of any Paying Agent or approve a change in the office through which any Paying Agent acts, except that we will be required to maintain a Paying Agent in each Place of Payment for the Debt Securities of a particular series.

All money paid by us to a Paying Agent for the payment of the principal of or any premium or interest on any Debt Security which remains unclaimed at the end of two years after such principal, premium or interest has become due and payable will be repaid to us, and the Holder of such Debt Security thereafter may look only to us for payment.

Consolidation, Merger and Sale of Assets

Unless otherwise specified in the prospectus supplement, we may not consolidate with or merge into, or transfer, lease or otherwise dispose of all or substantially all of our assets to, any Person (a “successor Person”), and may not permit any Person to consolidate with or merge into us, unless:

The successor Person (if not us) will be substituted for us under the applicable Indenture with the same effect as if it had been an original party to such Indenture, and, except in the case of a lease, we will be relieved from any further obligations under such Indenture and the Debt Securities.

Events of Default

Unless otherwise specified in the prospectus supplement, each of the following will constitute an Event of Default under the applicable Indenture with respect to Debt Securities of any series:

(4)

failure to perform or comply with the provisions described under “—Consolidation, Merger and Sale of Assets”;

If an Event of Default (other than an Event of Default with respect to Contango Oil & Gas Company described in clause (8) above) with respect to the Debt Securities of any series at the time Outstanding occurs and is continuing, either the applicable Trustee or the Holders of at least 25% in principal amount of the Outstanding Debt Securities of that series by notice as provided in the Indenture may declare the principal amount of the Debt Securities of that series (or, in the case of any Debt Security that is an Original Issue Discount Debt Security, such portion of the principal amount of such Debt Security as may be specified in the terms of such Debt Security) to be due and payable immediately, together with any accrued and unpaid interest thereon. If an Event of Default with respect to Contango Oil & Gas Company described in clause (8) above with respect to the Debt Securities of any series at the time Outstanding occurs, the principal amount of all the Debt Securities of that series (or, in the case of any such Original Issue Discount Security, such specified amount) will automatically, and without any action by the applicable Trustee or any Holder, become immediately due and payable, together with any accrued and unpaid interest thereon. After any such acceleration and its consequences, but before a judgment or decree based on acceleration, the Holders of a majority in principal amount of the Outstanding Debt Securities of that series may, under certain circumstances, rescind and annul such acceleration if all Events of Default with respect to that series, other than thenon-payment of accelerated principal (or other specified amount), have been cured or waived as provided in the applicable Indenture. For information as to waiver of defaults, see “—Modification and Waiver” below.

Subject to the provisions of the Indentures relating to the duties of the Trustees in case an Event of Default has occurred and is continuing, no Trustee will be under any obligation to exercise any of its rights or powers under the applicable Indenture at the request or direction of any of the Holders, unless such Holders have offered to such Trustee reasonable security or indemnity. Subject to such provisions for the indemnification of the

Trustees, the Holders of a majority in principal amount of the Outstanding Debt Securities of any series will have the right to direct the time, method and place of conducting any proceeding for any remedy available to such Trustee or exercising any trust or power conferred on the Trustee with respect to the Debt Securities of that series.

No Holder of a Debt Security of any series will have any right to institute any proceeding with respect to the applicable Indenture, or for the appointment of a receiver or a trustee, or for any other remedy thereunder, unless:

However, such limitations do not apply to a suit instituted by a Holder of a Debt Security for the enforcement of payment of the principal of or any premium or interest on such Debt Security on or after the applicable due date specified in such Debt Security or, if applicable, to convert such Debt Security.

We will be required to furnish to each Trustee annually a statement by certain of our officers, to their knowledge, as to whether or not we are in default in the performance or observance of any of the terms, provisions and conditions of the applicable Indenture and, if so, specifying all such known defaults.

Modification and Waiver

We may modify or amend an Indenture without the consent of any holders of the Debt Securities in certain circumstances, including:

Other modifications and amendments of an Indenture may be made by us, the Subsidiary Guarantors, if applicable, and the applicable Trustee with the consent of the Holders of a majority in principal amount of the

Outstanding Debt Securities of each series affected by such modification or amendment; provided, however, that no such modification or amendment may, without the consent of the Holder of each Outstanding Debt Security affected thereby:

(2)

reduce the principal amount of, or any premium or interest on, any Debt Security;

The Holders of a majority in principal amount of the Outstanding Debt Securities of any series may waive compliance by us with certain restrictive provisions of the applicable Indenture. The Holders of a majority in principal amount of the Outstanding Debt Securities of any series may waive any past default under the applicable Indenture, except a default in the payment of principal, premium or interest and certain covenants and provisions of the Indenture which cannot be amended without the consent of the Holder of each Outstanding Debt Security of such series.

Each of the Indentures provides that in determining whether the Holders of the requisite principal amount of the Outstanding Debt Securities have given or taken any direction, notice, consent, waiver or other action under such Indenture as of any date:

Except in certain limited circumstances, we will be entitled to set any day as a record date for the purpose of determining the Holders of Outstanding Debt Securities of any series entitled to give or take any direction,

notice, consent, waiver or other action under the applicable Indenture, in the manner and subject to the limitations provided in the Indenture. In certain limited circumstances, the Trustee will be entitled to set a record date for action by Holders. If a record date is set for any action to be taken by Holders of a particular series, only persons who are Holders of Outstanding Debt Securities of that series on the record date may take such action. To be effective, such action must be taken by Holders of the requisite principal amount of such Debt Securities within a specified period following the record date. For any particular record date, this period will be 180 days or such other period as may be specified by us (or the Trustee, if it set the record date), and may be shortened or lengthened (but not beyond 180 days) from time to time.

Satisfaction and Discharge

Each Indenture will be discharged and will cease to be of further effect as to all outstanding Debt Securities of any series issued thereunder, when:

Legal Defeasance and Covenant Defeasance

To the extent indicated in the applicable prospectus supplement, we may elect, at our option at any time, to have our obligations discharged under provisions relating to defeasance and discharge of indebtedness, which we call “legal defeasance,” or relating to defeasance of certain restrictive covenants applied to the Debt Securities of any series, or to any specified part of a series, which we call “covenant defeasance”.

Legal Defeasance. The Indentures provide that, upon our exercise of our option (if any) to have the legal defeasance provisions applied to any series of Debt Securities, we and, if applicable, each Subsidiary Guarantor will be discharged from all our obligations, and, if such Debt Securities are Subordinated Debt Securities, the provisions of the Subordinated Indenture relating to subordination will cease to be effective, with respect to such Debt Securities (except for certain obligations to convert, exchange or register the transfer of Debt Securities, to replace stolen, lost or mutilated Debt Securities, to maintain paying agencies and to hold moneys for payment in

trust) upon the deposit in trust for the benefit of the Holders of such Debt Securities of money or U.S. Government Obligations, or both, which, through the payment of principal and interest in respect thereof in accordance with their terms, will provide money in an amount sufficient (in the opinion of a nationally recognized firm of independent public accountants) to pay the principal of and any premium and interest on such

Debt Securities on the respective Stated Maturities in accordance with the terms of the applicable Indenture and such Debt Securities. Such defeasance or discharge may occur only if, among other things:

Covenant Defeasance. The Indentures provide that, upon our exercise of our option (if any) to have the covenant defeasance provisions applied to any Debt Securities, we may fail to comply with certain restrictive covenants (but not with respect to conversion, if applicable), including those that may be described in the applicable prospectus supplement, and the occurrence of certain Events of Default, which are described above in clause (5) (with respect to such restrictive covenants) and clauses (6), (7) and (9) under “Events of Default” and any that may be described in the applicable prospectus supplement, will not be deemed to either be or result in an Event of Default and, if such Debt Securities are Subordinated Debt Securities, the provisions of the Subordinated Indenture relating to subordination will cease to be effective, in each case with respect to such Debt Securities. In order to exercise such option, we must deposit, in trust for the benefit of the Holders of such Debt Securities, money or U.S. Government Obligations, or both, which, through the payment of principal and interest in respect thereof in accordance with their terms, will provide money in an amount sufficient (in the opinion of a nationally recognized firm of independent public accountants) to pay the principal of and any premium and interest on such Debt Securities on the respective Stated Maturities in accordance with the terms of the applicable Indenture and such Debt Securities. Such covenant defeasance may occur only if we have delivered to the applicable Trustee an Opinion of Counsel to the effect that Holders of such Debt Securities will not recognize gain or loss for federal income tax purposes as a result of such deposit and covenant defeasance and will be subject to federal income tax on the same amount, in the same manner and at the same times as would have been the case if such deposit and covenant defeasance were not to occur, and the requirements set forth in clauses (2), (3), (4) and (5) above are satisfied. If we exercise this option with respect to any series of Debt Securities and such Debt Securities were declared due and payable because of the occurrence of any Event of Default, the amount of money and U.S. Government Obligations so deposited in trust would be sufficient to pay amounts due

on such Debt Securities at the time of their respective Stated Maturities but may not be sufficient to pay amounts due on such Debt Securities upon any acceleration resulting from such Event of Default. In such case, we would remain liable for such payments.

If we exercise either our legal defeasance or covenant defeasance option, any Subsidiary Guarantee will terminate.

No Personal Liability of Directors, Officers, Employees and Shareholders

No director, officer, employee, incorporator, shareholder, member, partner or trustee of the Company or any Subsidiary Guarantor, as such, shall have any liability for any obligations of the Company or any Subsidiary Guarantor under the Debt Securities, the Indentures or any Subsidiary Guarantees or for any claim based on, in respect of, or by reason of, such obligations or their creation. By accepting a Debt Security, each Holder shall be deemed to have waived and released all such liability. The waiver and release shall be a part of the consideration for the issue of the Debt Securities. The waiver may not be effective to waive liabilities under the federal securities laws, and it is the view of the SEC that such a waiver is against public policy.

Notices

Notices to Holders of Debt Securities will be given by mail to the addresses of such Holders as they may appear in the Security Register.

Title

We, the Subsidiary Guarantors, the Trustees and any agent of us, the Subsidiary Guarantors or a Trustee may treat the Person in whose name a Debt Security is registered as the absolute owner of the Debt Security (whether or not such Debt Security may be overdue) for the purpose of making payment and for all other purposes.

Governing Law

The Indentures and the Debt Securities will be governed by, and construed in accordance with, the law of the State of New York.

The Trustee

We will enter into the Indentures with a Trustee that is qualified to act under the Trust Indenture Act of 1939, as amended, and with any other Trustees chosen by us and appointed in a supplemental indenture for a particular series of Debt Securities. We may maintain a banking relationship in the ordinary course of business with our Trustee and one or more of its affiliates.

Resignation or Removal of Trustee. If the Trustee has or acquires a conflicting interest within the meaning of the Trust Indenture Act, the Trustee must either eliminate its conflicting interest or resign, to the extent and in the manner provided by, and subject to the provisions of, the Trust Indenture Act and the applicable Indenture. Any resignation will require the appointment of a successor Trustee under the applicable Indenture in accordance with the terms and conditions of such Indenture.

The Trustee may resign or be removed by us with respect to one or more series of Debt Securities and a successor Trustee may be appointed to act with respect to any such series. The holders of a majority in aggregate principal amount of the Debt Securities of any series may remove the Trustee with respect to the Debt Securities of such series.

Limitations on Trustee if It Is Our Creditor. Each Indenture will contain certain limitations on the right of the Trustee, in the event that it becomes our creditor, to obtain payment of claims in certain cases, or to realize on certain property received in respect of any such claim as security or otherwise.

Certificates and Opinions to Be Furnished to Trustee. Each Indenture will provide that, in addition to other certificates or opinions that may be specifically required by other provisions of an Indenture, every application by us for action by the Trustee must be accompanied by an Officers’ Certificate and an Opinion of Counsel stating that, in the opinion of the signers, all conditions precedent to such action have been complied with by us.

DESCRIPTION OF CAPITAL STOCK

The following descriptions are summaries ofset forth certain material terms and provisions of our common stock, which is registered under Section 12 of the Securities Exchange Act of 1934, as amended, and our preferred stock. The following descriptions of our common stock and preferred stock certificate of incorporationare not complete and bylaws. This summary isare qualified in their entirety by reference to our amended and restated certificate of incorporation,formation (including any statement of resolution of preferred stock) and our bylaws, and the designations of our preferred stock, which are filed as exhibits to our Annual Report on Form10-K.

General

The authorized capital stock of the registration statementCompany consists of 205,000,000 shares, which this prospectus formsincludes 200,000,000 shares authorized as common stock, $0.04 par value, and 5,000,000 shares authorized as preferred stock, $0.04 par value. Subject to the approval of the shareholders at the Company’s 2020 Annual Meeting of Stockholders, the Board has approved a part,proposal to amend the Company’s Amended and Restated Certificate of Formation to increase the number of authorized shares of Common Stock from 200,000,000 to 400,000,000. If adopted by the provisionsshareholders, the amendment would become effective upon filing of applicable law.

We are authorized to issue 50.0 millionan appropriate certificate of amendment with the Secretary of State of the State of Texas. As of May 11, 2020, we had: (i) 183 holders of record of common stock and 129,052,061 shares of common stock outstanding; (ii) no shares of Series A Contingent Convertible Preferred Stock, par value $0.04 per share, and 5.0 million shares of preferred stock,(“Series A Preferred Stock”) outstanding; (iii) no Series B Contingent Convertible Preferred Stock, par value $0.04 per share. As(“Series B Preferred Stock”) outstanding; and (iv) eight holders of January 27, 2017 there were 25,238,600record of Series C Contingent Convertible Preferred Stock, par value $0.04 (“Series C Preferred Stock”), and 2,700,000 shares of Series C Preferred Stock outstanding.

Description of Common Stock

Dividends. Holders of common stock are entitled to such dividends as may be declared by the board of directors (the “Board”) out of funds legally available. Any decision to pay future dividends on our common stock issuedwill be at the discretion of our Board and will depend upon our financial condition, results of operations, capital requirements and other factors our Board may deem relevant. Our credit facility currently restricts our ability to pay cash dividends on our common stock, and we may also enter into credit agreements or other borrowing arrangements in the future that restrict or limit our ability to pay cash dividends on our common stock.

Fully Paid. All outstanding (including 638,158 shares of restricted common stock issued, pursuant to our equity compensation plans)are fully paid and held by approximately 121 record owners.non-assessable upon issuance.

Common Stock

Voting Rights.Holders of common stock are entitled to one vote per share with respect to each matter presented to our stockholders on which the holders of common stock are entitled to vote. Because holders of common stock doCommon stockholders are not haveentitled to preemptive or cumulative voting rights,rights. Unless specified in our amended and restated certificate of formation (including any statement of resolution of preferred stock) or the bylaws of the Company, or as required by applicable provisions of the Texas Business Organizations Code (the “TBOC”) or applicable stock exchange rules, the affirmative vote of the holders of a majority of the voting power of the outstanding shares of ourthe Company entitled to vote on a matter is required to approve any such matter voted on by the Company’s stockholders.

Other Rights. In the event of a liquidation, dissolution or winding up of the Company, the holders of the common stock can electare entitled to share ratably in all assets remaining available for distribution to them after payment of liabilities and after provision is made for each class of stock, if any, having preference over the members of the board of directors standing for election, subject to the rights, powers and preferences of any outstanding series of preferredcommon stock. No share of common stock affords any preemptive rights or is convertible, redeemable, assessable or entitled to the benefits of any sinking or repurchase fund.

Subject toTransfer Agent and Registrar. Our transfer agent and registrar for our common stock, Series A Preferred Stock, Series B Preferred Stock, and Series C Preferred Stock is Continental Stock Transfer & Trust Company, LLC, located in New York, New York.

Listing. Our common stock is listed on the prior rightsNYSE American and trades under the symbol “MCF.”

Description of holdersPreferred Stock

Our amended and restated certificate of formation authorizes 5,000,000 shares of preferred stock if any, holdersand provides that shares of commonpreferred stock are entitled to receive dividends as may be lawfully declaredissued from time to time by our board of directors. Upon our liquidation, dissolution or winding up, whether voluntary or involuntary, holders of common stock will be entitled to receive such assets as are available for distribution to our stockholders after there shall have been paid or set apart for payment the full amounts necessary to satisfy any preferential or participating rights to which the holders of each outstanding series of preferred stock are entitled by the express terms of the series.

The shares of our common stock presently outstanding are fully paid and non-assessable, and any shares issued by us pursuant to this prospectus will be fully paid and non-assessable when issued. Our common stock trades on the NYSE MKT under the symbol “MCF.”

Preferred Stock

Our Board has the authority to issue preferred stock in one or more series andseries. Our Board is expressly granted authority to fix thefor each such series such voting powers, full or limited, and such designations, powers, preferences and relative, participating, optional or other special rights and thesuch qualifications, limitations or restrictions thereof including dividend rights, dividend rates, conversion rights,as shall be stated and expressed in the resolution or resolutions adopted by the Board providing for the issue of such series and as may be permitted by the TBOC.

In September and November 2019, the Company established and issued Series A Preferred Stock and Series B Preferred Stock, respectively. On December 12, 2019, upon the approval from the holders of a majority of the voting rights, termspower of redemption, redemption prices, liquidation preferences andthe Company’s capital stock to increase the number of common shares constituting any classauthorized for issuance from 100 million to 200 million common shares, the outstanding shares of Series A Preferred Stock and Series B Preferred Stock automatically converted into common stock and, upon the conversion, all outstanding shares of Series A Preferred Stock and Series B Preferred Stock were cancelled.

The Series C Preferred Stock ranks equal to the common stock, the Series A Preferred Stock and the Series B Preferred Stock with respect to dividend rights and rights upon liquidation. The Series C Preferred Stock has no voting rights. Subject to the approval of the shareholders at the Company’s 2020 Annual Meeting of Stockholders, each share of Series C Preferred Stock will automatically convert into one common share and the outstanding shares of Series C Preferred Stock will be cancelled.

No dividends shall accrue or series, without further vote or actionbe payable on the Series C Preferred Stock until December 23, 2020. Holders of the Series C Preferred Stock are entitled to receive, when and as declared by the stockholders. The issuance of preferred stock may have the effect of delaying, deferring or preventing a change in control of us without further actionBoard and declared by the stockholdersCompany, cash dividends of ten percent (10%) of the $2.50 original issue price per annum on each outstanding share of Series C Preferred Stock. Such dividends shall accrue from December 23, 2020. Following such date, subject to compliance with the Company’s credit agreement, dividends shall be payable quarterly in cash on March 31, June 30, September 30 and may adversely affectDecember 31 of each year, beginning December 31, 2020, when, as and if declared by the votingBoard, and other rightsshall cease to accrue on the date immediately preceding the date of conversion of the Series C Preferred Stock to common stock; provided, however, when there are no shares of Series C Preferred Stock outstanding, no dividends, including any dividends which have accrued, shall be payable to the holders of common stock. Our preferred stock is senior to our common stock regarding liquidation. At present, we have nothe shares of preferred stock issued and outstanding.

Outstanding Options

At January 27, 2017, we had outstanding options forSeries C Preferred Stock or the purchaseholders of approximately 111,905the shares of common stock at prices ranging from $28.96 to $60.33 per share, including employee stock. If we issue additional options, existing stockholders’ percentage ownershipinto which the shares of us may be further diluted.Series C Preferred Stock convert.

Anti-TakeoverCertain Provisions of ourOur Amended and Restated Certificate of IncorporationFormation, Bylaws and By-lawsLaw

Certificate of IncorporationOur amended and Bylaws. Certain provisions in ourrestated certificate of incorporation and bylaws summarized below may be deemed to have an anti-takeover effect and may delay, deter, or prevent a tender offer

or takeover attempt that a stockholder might consider to be in its best interests, including attempts that might result in a premium being paid over the market price for the shares held by stockholders.

Our certificate of incorporationformation and bylaws contain provisions that (unless,may render more difficult possible takeover proposals to acquire control of us and make removal of our management more difficult. Below is a description of certain of these provisions in our amended and restated certificate of formation and bylaws.

Anti-takeover Statute

Pursuant to our governing documents, the Company has opted out of TBOC §21.606 (the “Texas Anti-takeover Statute”); however, our bylaws incorporate anti-takeover provisions (the “Bylaw Anti-takeover Provisions”) that are based on the Texas Anti-takeover Statute. These Bylaw Anti-takeover Provisions give us flexibility to engage in certain beneficial transactions with any of our shareholders while still providing the appropriate level of anti-takeover protections for a corporation of our size and shareholder base. Specifically, the Bylaw Anti-takeover Provisions include substantially the same restrictions that are provided for under the Texas Anti-takeover Statute, provided that those restrictions do not apply to (i) John Goff and his affiliated funds at any time that they own less than 23% of the Company’s outstanding shares (or such higher ownership threshold as a general matter, a preferred stock designation provides otherwise for that series of preferred stock):

has approved to increase to an ownership threshold of 45%) or (ii) a transaction between the Company and any person that holds more series and, with respect to each such series, to fix the number of shares constituting the series and the designationthan 20% of the series, the voting powers (if any)Company’s outstanding shares if such transaction is approved in advance by (A) a majority of the sharescontinuing and unaffiliated directors of the series,Company and the preferences and relative, participating, optional, and other special rights, if any, and any qualification, limitations or restrictions of the shares of such series;

Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers or persons controlling the registrant pursuant to the foregoing provisions, we have been informed that, in the opinion of the Securities and Exchange Commission, such indemnification is against public policy as expressed in the Securities Act and is therefore unenforceable.

Forum for Shareholder Litigation

Our bylaws provide, subject to limited exceptions, that the United States District Court for the Southern District of Texas will be the sole and exclusive forum for certain stockholder litigation matters. Unless we consent to the selection of an alternative forum, the United States District Court for the Southern District of Texas or, if such court lacks jurisdiction, the state district court of Harris County, Texas, shall, to the fullest extent permitted by law, be the sole and exclusive forum for any (i) derivative action or proceeding brought in the name or right of the Company or on its behalf, (ii) action asserting a claim for breach of a fiduciary duty owed by any director, officer, employee or other agent of the Company to the Company or the Company’s stockholders, we could amend(iii) action asserting a claim arising pursuant to any provision of the TBOC, or our certificate of incorporation in the future to elect not to beformation or bylaws, or (iv) action asserting a claim governed by the anti-takeover law.internal affairs doctrine. Such restrictions could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our directors, officers, employees or stockholders.

DESCRIPTION OF DEPOSITARY SHARES

General

We may offer fractional shares of preferred stock, rather than full shares of preferred stock. If we decide to offer fractional shares of preferred stock, we will issue receipts for depositary shares. Each depositary share will represent a fraction of a share of a particular series of preferred stock. The prospectus supplement will indicate that fraction. The shares of preferred stock represented by depositary shares will be deposited under a depositary agreement between us and a bank or trust company that meets certain requirements and is selected by us (the “Bank Depositary”). Each owner of a depositary share will be entitled to all the rights and preferences of the preferred stock represented by the depositary share. The depositary shares will be evidenced by depositary receipts issued pursuant to the depositary agreement. Depositary receipts will be distributed to those persons purchasing the fractional shares of preferred stock in accordance with the terms of the offering.

We have summarized selected provisions of a depositary agreement and the related depositary receipts. The summary is not complete. The forms of the depositary agreement and the depositary receipts relating to any particular issue of depositary shares will be filed with the SEC via a Current Report on Form8-K prior to our offering of the depositary shares, and you should read such documents for provisions that may be important to you.

Dividends and Other Distributions

If we pay a cash distribution or dividend on a series of preferred stock represented by depositary shares, the Bank Depositary will distribute such dividends to the record holders of such depositary shares. If the distributions are in property other than cash, the Bank Depositary will distribute the property to the record holders of the depositary shares. However, if the Bank Depositary determines that it is not feasible to make the distribution of property, the Bank Depositary may, with our approval, sell such property and distribute the net proceeds from such sale to the record holders of the depositary shares.

Redemption of Depositary Shares

If we redeem a series of preferred stock represented by depositary shares, the Bank Depositary will redeem the depositary shares from the proceeds received by the Bank Depositary in connection with the redemption. The redemption price per depositary share will equal the applicable fraction of the redemption price per share of the preferred stock. If fewer than all the depositary shares are redeemed, the depositary shares to be redeemed will be selected by lot or pro rata as the Bank Depositary may determine.

Voting the Preferred Stock

Upon receipt of notice of any meeting at which the holders of the preferred stock represented by depositary shares are entitled to vote, the Bank Depositary will mail the notice to the record holders of the depositary shares relating to such preferred stock. Each record holder of these depositary shares on the record date (which will be the same date as the record date for the preferred stock) may instruct the Bank Depositary as to how to vote the preferred stock represented by such holder’s depositary shares. The Bank Depositary will endeavor, insofar as practicable, to vote the amount of the preferred stock represented by such depositary shares in accordance with such instructions, and we will take all action which the Bank Depositary deems necessary in order to enable the Bank Depositary to do so. The Bank Depositary will abstain from voting shares of the preferred stock to the extent it does not receive specific instructions from the holders of depositary shares representing such preferred stock.

Amendment and Termination of the Depositary Agreement

The form of depositary receipt evidencing the depositary shares and any provision of the depositary agreement may be amended by agreement between the Bank Depositary and us. However, any amendment that

materially and adversely alters the rights of the holders of depositary shares will not be effective unless such amendment has been approved by the holders of at least a majority of the depositary shares then outstanding. The depositary agreement may be terminated by the Bank Depositary or us only if (1) all outstanding depositary shares have been redeemed or (2) there has been a final distribution in respect of the preferred stock in connection with any liquidation, dissolution or winding up of our company and such distribution has been distributed to the holders of depositary receipts.

Charges of Bank Depositary

We will pay all transfer and other taxes and governmental charges arising solely from the existence of the depositary arrangements. We will pay charges of the Bank Depositary in connection with the initial deposit of the preferred stock and any redemption of the preferred stock. Holders of depositary receipts will pay other transfer and other taxes and governmental charges and any other charges, including a fee for the withdrawal of shares of preferred stock upon surrender of depositary receipts, as are expressly provided in the depositary agreement to be for their accounts.

Withdrawal of Preferred Stock

Upon surrender of depositary receipts at the principal office of the Bank Depositary, subject to the terms of the depositary agreement, the owner of the depositary shares may demand delivery of the number of whole shares of preferred stock and all money and other property, if any, represented by those depositary shares. Partial shares of preferred stock will not be issued. If the depositary receipts delivered by the holder evidence a number of depositary shares in excess of the number of depositary shares representing the number of whole shares of preferred stock to be withdrawn, the Bank Depositary will deliver to such holder at the same time a new depositary receipt evidencing the excess number of depositary shares. Holders of preferred stock thus withdrawn may not thereafter deposit those shares under the depositary agreement or receive depositary receipts evidencing depositary shares therefor.

Miscellaneous

The Bank Depositary will forward to holders of depositary receipts all reports and communications from us that are delivered to the Bank Depositary and that we are required to furnish to the holders of the preferred stock.

Neither the Bank Depositary nor we will be liable if we are prevented or delayed by law or any circumstance beyond our control in performing our obligations under the depositary agreement. The obligations of the Bank Depositary and us under the depositary agreement will be limited to performance in good faith of our duties thereunder, and neither of us will be obligated to prosecute or defend any legal proceeding in respect of any depositary shares or preferred stock unless satisfactory indemnity is furnished. Further, both of us may rely upon written advice of counsel or accountants, or upon information provided by persons presenting preferred stock for deposit, holders of depositary receipts or other persons believed to be competent and on documents believed to be genuine.

Resignation and Removal of Bank Depositary

The Bank Depositary may resign at any time by delivering to us notice of its election to do so, and we may at any time remove the Bank Depositary. Any such resignation or removal will take effect upon the appointment of a successor Bank Depositary and its acceptance of such appointment. Such successor Bank Depositary must be appointed within 60 days after delivery of the notice of resignation or removal and must be a bank or trust company having its principal office in the United States and having a combined capital and surplus of at least $50 million.

DESCRIPTION OF WARRANTS

We may issue warrants for the purchase of our common stock and/or preferred stock. Warrants may be issued independently or together with debt securities, preferred stock, or common stock or subscription rights offered by any prospectus supplement. Each series of warrants will be issued under a separate warrant agreement to be entered into between us and a bank or trust company, as warrant agent, all as set forth in the prospectus supplement relating to the particular issue of warrants. The warrant agent will act solely as our agent in connection with the warrants and will not assume any obligation or relationship of agency or trust for or with any holders of warrants or beneficial owners of warrants. The following summary of certain provisions of the warrants does not purport to be complete and is subject to, and is qualified in its entirety by reference to, all provisions of the warrant agreements.

You should refer to the prospectus supplement relating to a particular issue of warrants for the terms of and information relating to the warrants, including, where applicable:

Warrants will be offered and exercisable for United States dollars only. Warrants will be issued in registered form only. Each warrant will entitle its holder to purchase such number of shares of common stock or preferred stock at such exercise price as is in each case set forth in, or calculable from, the prospectus supplement relating to the warrants. The exercise price may be subject to adjustment upon the occurrence of events described in such prospectus supplement. After the close of business on the Expiration Date (or such later date to which we may extend such Expiration Date), unexercised warrants will become void. The place or places where, and the manner in which, warrants may be exercised will be specified in the prospectus supplement relating to such warrants.

Prior to the exercise of any warrants, holders of the warrants will not have any of the rights of holders of common stock, including the right to receive payments of any dividends on the common stock purchasable upon exercise of the warrants, or to exercise any applicable right to vote.

DESCRIPTION OF SUBSCRIPTION RIGHTS

We may issue subscription rights to purchase our common stock, preferred stock and/or debt securities in one or more series. Subscription rights may be offered independently or together with our common stock, preferred stock, debt securities and/or warrants offered by any prospectus supplement, and may be attached to or separate from those securities. While the terms we have summarized below will generally apply to any future rights we may offer pursuant to this prospectus, we will describe the particular terms of any subscription rights that we may offer in more detail in the applicable prospectus supplements. The terms of any subscription rights we offer under a prospectus supplement may differ from the terms we describe below.

The applicable prospectus supplements relating to any subscription rights that we offer will include specific terms of any offering of rights for which this prospectus is being delivered, including the following, to the extent applicable:

The description in the applicable prospectus supplements of any subscription rights that we may offer will not necessarily be complete and will be qualified in its entirety by reference to the applicable rights agreement and/or rights certificate, which will be filed with the SEC in connection therewith. Therefore, you should carefully consider the actual provisions of the rights, the rights agreement and the applicable securities.

PLAN OF DISTRIBUTION

We may sell the securities on a delayed or continuous basis in and outside the United States through underwriters or dealers as designated from time to time, directly to purchasers, through agents or through a combination of these methods.

We, or agents designated by us, may directly solicit, from time to time, offers to purchase the securities. Any such agent may be deemed to be an underwriter as that term is defined in the Securities Act. We will name the agents involved in the offer or sale of the securities and describe any commissions payable by us to these agents in the prospectus supplement. Unless otherwise indicated in the prospectus supplement, these agents will be acting on a best efforts basis for the period of their appointment. The agents may be entitled under agreements they may enter into with us to indemnification by us against specified civil liabilities, including liabilities under the Securities Act. The agents may also be our customers or may engage in transactions with or perform services for us in the ordinary course of business.

Sales Through Underwriters or Dealers

If we use underwriters in the sale of securities, the underwriters will acquire the securities for their own account. The underwriters may resell the securities from time to time in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the time of sale.

Underwriters may offer securities to the public either through underwriting syndicates represented by one or more managing underwriters or directly by one or more firms acting as underwriters. Unless we inform you otherwise in the prospectus supplement and except as described below, the obligations of the underwriters to purchase the securities will be subject to conditions, and the underwriters will be obligated to purchase all the offered securities if they purchase any of them. The underwriters may change from time to time any initial public offering price and any discounts or concessions allowed orre-allowed or paid to dealers.

During and after an offering through underwriters, the underwriters may purchase and sell the securities in the open market. These transactions may include overallotment and stabilizing transactions and purchases to cover syndicate short positions created in connection with the offering. The underwriters also may impose a penalty bid, which means that selling concessions allowed to syndicate members or other broker-dealers for the offered securities sold for their account may be reclaimed by the syndicate if the offered securities are repurchased by the syndicate in stabilizing or covering transactions. These activities may stabilize, maintain or otherwise affect the market price of the offered securities, which may be higher than the price that might otherwise prevail in the open market. If commenced, the underwriters may discontinue these activities at any time.

If we use dealers in the sale of securities, we will sell the securities to them as principals. They may then resell those securities to the public at varying prices determined by the dealers at the time of resale. The dealers participating in any sale of the securities may be deemed to be underwriters within the meaning of the Securities Act with respect to any sale of those securities. We will include in the prospectus supplement the names of the dealers and the terms of the transaction.

At-the-Market Offerings

Underwriters or agents could makes sales in privately negotiated transactions and/or any other method permitted by law, including sales deemed to be an “at-the-market”“at-the-market” offering as defined in Rule 415 under the Securities Act, which includes sales made directly on or through the New York Stock Exchange,NYSE American, the existing trading market for our common stock, or sales made to or through a market maker other than on an exchange.

To the extent that we make sales through one or more underwriters or agents in “at-the-market”“at-the-market” offerings, we will do so pursuant to the terms of a sales agency financing agreement or other “at-the-market”“at-the-market” offering

arrangement with such underwriters or agents. If we engage inat-the-market sales pursuant to any such agreement, we will issue and sell securities through one or more underwriters or agents, which may act on an agency basis or on a principal basis. During the term of any such agreement, we may sell securities on a daily basis in exchange transactions or otherwise as we agree with the underwriters or agents. The agreement will provide that any securities sold will be sold at prices related to the then prevailing market prices for such securities. Therefore, exact figures regarding proceeds that will be raised or commissions to be paid cannot be determined at this time. Pursuant to the terms of the agreement, we also may agree to sell, and the relevant underwriters or agents may agree to solicit offers to purchase, blocks of securities. The terms of each such agreement will be set forth in more detail in the applicable prospectus supplement and any related free writing prospectus. In the event that any underwriter or agent acts as principal, or any broker-dealer acts as underwriter, it may engage in certain transactions that stabilize, maintain, or otherwise affect the price of the securities. Any such activities will be described in the prospectus supplement or any related free writing prospectus relating to the transaction.

Direct Sales and Sales Through Agents

We may sell the securities directly. In that event, no underwriters or agents would be involved. We may also sell the securities through agents we designate from time to time. In the prospectus supplement, we will name any agent involved in the offer or sale of the offered securities, and we will describe any commissions payable by us to the agent. Unless we inform you otherwise in the prospectus supplement, any agent will agree to use its reasonable best efforts to solicit purchases for the period of its appointment.

We may sell the securities directly to institutional investors or others who may be deemed to be underwriters within the meaning of the Securities Act with respect to any sale of those securities. We will describe the terms of any such sales in the prospectus supplement.

Remarketing Arrangements

We may offer and sell any of the securities in connection with a remarketing upon their purchase, in accordance with a redemption or repayment by their terms or otherwise, by one or more remarketing firms acting as principals for their own accounts or as our agents. We will identify any remarketing firm, the terms of any remarketing agreement and the compensation to be paid to the remarketing firm in the prospectus supplement. Remarketing firms may be deemed underwriters under the Securities Act.

Delayed Delivery Contracts

If we so indicate in the prospectus supplement, we may authorize agents, underwriters or dealers to solicit offers from certain types of institutions to purchase securities from us at the public offering price under delayed delivery contracts. These contracts would provide for payment and delivery on a specified date in the future. The contracts would be subject only to those conditions described in the prospectus supplement. The prospectus supplement will describe the commission payable for solicitation of those contracts.

Derivative Transactions

We may enter into derivative transactions with third parties, or sell securities not covered by this prospectus to third parties in privately negotiated transactions. If the applicable prospectus supplement indicates, in connection with those derivatives, the third parties may sell securities covered by this prospectus and the applicable prospectus supplement, including in short sale transactions. If so, the third parties may use securities pledged by us or borrowed from us or others to settle those sales or to close out any related open borrowings of stock, and may use securities received from us in settlement of those derivatives to close out any related open

borrowings of stock. The third parties in these sale transactions will be underwriters and will be identified in the applicable prospectus supplement or in a post-effective amendment to the registration statement of which this prospectus forms a part. If securities are to be sold through subscription rights, the subscription rights may be distributed as a dividend to the stockholders.

General Information

We may have agreements with the agents, dealers, underwriters and remarketing firms to indemnify them against certain civil liabilities, including liabilities under the Securities Act, or to contribute with respect to payments that the agents, dealers, underwriters or remarketing firms may be required to make. Agents, dealers, underwriters and remarketing firms may be customers of, engage in transactions with, or perform services for us in the ordinary course of their businesses.

LEGAL MATTERS

The validity of the securities described in this prospectus will be passed upon for us by VinsonGibson, Dunn & Elkins L.L.P.,Crutcher LLP, Houston, Texas. LegalIf the securities are being distributed through underwriters or agents, the validity of the securities will be passed upon for the underwriters or agents by counsel to any underwriters may pass upon legal matters for such underwriters.identified in the related prospectus supplement.

EXPERTS

The audited consolidated financial statements and management’s assessment of the effectiveness of internal control over financial reporting of Contango Oil & Gas Company incorporated by reference in this prospectus and elsewhere in the registration statement have been so incorporated by reference in reliance upon the reports of Grant Thornton LLP, independent registered public accountants, upon the authority of said firm as experts in accounting and auditing.

The audited consolidated financial statements of Exaro Energy III LLC incorporated by reference in this prospectus and elsewhere in the registration statement have been so incorporated by reference in reliance upon the report of BDO USA, LLP, independent registered public accountants, upon the authority of said firm as experts in accounting and auditing.

Certain estimates of proved oil and gas reserves for Contangothe Company incorporated by reference herein were based in part upon reports by Netherland, Sewell & Associates, Inc. and William M. Cobb & Associates, Inc., an independent petroleum engineering firms.firm. Certain estimates of proved oil and gas reserves for Exaro Energy III, LLC incorporated by reference herein were based in part upon reports by W.D. Von Gonten & Co., an independent petroleum engineering firm. These estimates are included and incorporated herein in reliance on the authority of such firms as experts in such matters.

The information in this preliminary prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission becomes effective. This preliminary prospectus is not an offer to sell the securities described herein and it is not soliciting an offer to buy such securities in any state where such offer or sale is not permitted.

Subject to completion, dated January 27, 2017

PROSPECTUS

CONTANGO OIL & GAS COMPANY

1,287,732 shares of Common Stock

This prospectus relates to 1,287,732 shares of our common stock held by the selling stockholders.

The securities to be offered and sold using this prospectus are currently issued and outstanding sharesconsolidated financial statements of our common stock. These shares of common stock may be offered and sold by the selling stockholders named in this prospectus or in any supplement to this prospectus from time to time in accordance with the provisions set forth under “Plan of Distribution.”

The selling stockholders named in this prospectus or in any supplement to this prospectus may sell the shares offered by this prospectus from time to time on any exchange on which the shares are listed on terms to be negotiated with buyers. The selling stockholders named in this prospectus acquired the shares in connection with our merger with Crimson Exploration Inc. in October 2013. The selling stockholders may also sell the shares in private sales or through dealers or agents. The selling stockholders may sell the shares at prevailing market prices or at prices negotiated with buyers. The selling stockholders will be responsible for any underwriting discounts and commissions due to brokers, dealers or agents. We will be responsible for all other offering expenses.

A supplement to this prospectus may add, update or change information contained in this prospectus. You should read this prospectus and any prospectus supplement carefully before you invest.

You should carefully read this prospectus and any accompanying prospectus supplement, together with the documents we incorporate by reference, before you invest in any of our securities.

Investing in our securities involves risk. Please see “Risk Factors” for a discussion of certain risks that you should consider in connection with an investment in the securities.

Our common stock is listed on the NYSE MKT under the symbol “MCF.” On January 26, 2017, the last reported sale price of our common stock on the NYSE MKT was $9.21 per share.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

This prospectus is dated                 , 2017.

TABLE OF CONTENTS

You should rely only on the information contained or incorporated by reference in this prospectus and any prospectus supplement. We have not authorized anyone to provide you with additional or different information. If anyone provides you with different or inconsistent information, you should not rely on it. This prospectus and any prospectus supplement are not an offer to sell or the solicitation of an offer to buy any securities other than the securities to which they relate and are not an offer to sell or the solicitation of an offer to buy securities in any jurisdiction to any person to whom it is unlawful to make an offer or solicitation in that jurisdiction. You should not assume that the information in this prospectus or any prospectus supplement or in any document incorporated by reference in this prospectus or any prospectus supplement is accurateWhite Star Petroleum, LLC as of any date other thanDecember 31, 2018 and 2017, and the date of the document containing the information.

i

ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission, which we refer to as the “SEC,” utilizing a shelf registration process. Under this shelf registration process, the selling stockholders named in this prospectus or any supplement to this prospectus may sell the securities described in this prospectus in one or more offerings. This prospectus provides you with a general description of the securities the selling stockholders may offer. To the extent appropriate, we may provide a prospectus supplement that contains specific information about the terms of the offering. A prospectus supplement may also add, update or change information contained in this prospectus. Any statement that we make in this prospectus will be modified or superseded by any inconsistent statement made by us in a prospectus supplement. You should read both this prospectus and any prospectus supplement together with additional information described under the heading “Where You Can Find More Information.”

Unless the context requires otherwise or unless otherwise noted, all references in this prospectus or any accompanying prospectus supplement to “Contango,” “we” or “our” are to Contango Oil & Gas Company and its subsidiaries and all references to “Crimson” are to our subsidiaries, Crimson Exploration Inc. and Crimson Exploration Operating, Inc.

THE COMPANY

We are a Houston, Texas based, independent oil and natural gas company. Our business is to maximize production and cash flow from our onshore properties in Texas and Wyoming and offshore properties in the shallow waters of the Gulf of Mexico and to use that cash flow to explore, develop, exploit and acquire crude oil and natural gas properties in the onshore Texas Gulf Coast and Rocky Mountain regions of the United States.

Our principal executive offices are located at 717 Texas Avenue, Suite 2900, Houston, Texas 77002, and our phone number is (713) 236-7400. Our website is located athttp://www.contango.com. We make our periodic reports and other information filed with or furnished to the SEC available, free of charge, through our website, as soon as reasonably practicable. Information contained on our website is not incorporated by reference into this prospectus, and you should not consider information contained on our website as part of this prospectus.

For additional information as to our business, properties, and financial condition, please refer to the documents cited in “Where You Can Find More Information.”

WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and current reports and other information with the SEC (File No. 001-12108) pursuant to the Securities Exchange Act of 1934, as amended (the “Exchange Act”). You may read and copy any documents that are filed at the SEC’s Public Reference Room at 100 F Street, N.E., Room 1580, Washington, D.C. 20549. You may also obtain copies of these documents at prescribed rates from the Public Reference Section of the SEC at its Washington address. Please call the SEC at l-800-SEC-0330 for further information. Our filings are also available to the public through the SEC’s website atwww.sec.gov.

The SEC allows us to “incorporate by reference” information that we file with them, which means that we can disclose important information to you by referring you to documents previously filed with the SEC. The information incorporated by reference is an important part of this prospectus, and information that we file later with the SEC will automatically update and supersede this information. The following documents we filed with the SEC pursuant to the Exchange Act are incorporated herein by reference:

In addition, we incorporate by reference in this prospectus any future filings made by Contango with the SEC under Sections 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934 (the “Exchange Act”) (excluding any information furnished and not filed with the SEC) after the date on which the registration statement that includes this prospectus was initially filed with the SEC (including all such documents that we may file with the SEC after the date of the initial registration statement and prior to the effectiveness of the registration statement) and until all offerings under this registration statement are terminated shall be deemed to be incorporated in this prospectus by reference and to be a part hereof from the date of filing of such documents.

Any statement contained in a documentyears then ended, have been incorporated by reference herein shall be deemed to be modified or superseded for all purposes to the extent that a statement contained in this prospectus or in any other subsequently filed document which is also incorporated or deemed to be incorporated by reference, modifies or supersedes such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus.

You may request a copy of these filings (other than an exhibit to a filing unless that exhibit is specifically incorporated by reference into that filing) at no cost by writing or telephoning us at the following address and telephone number:

Contango Oil & Gas Company

Attention: Corporate Secretary

717 Texas Avenue, Suite 2900

Houston, Texas 77002

(713) 236-7400

We also maintain a website athttp://www.contango.com. However, the information on our website is not part of this prospectus.

CAUTIONARY STATEMENTS REGARDING FORWARD-LOOKING STATEMENTS

Certain statements contained in or incorporated by reference into this prospectus, or filings with the SEC and our public releases may contain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, and Section 21E of the Securities Exchange Act of 1934, as amended. The words and phrases “should be”, “will be”, “believe”, “expect”, “anticipate”, “estimate”, “forecast”, “goal” and similar expressions identify forward-looking statements and express our expectations about future events. Although we believe the expectations reflected in such forward-looking statements are reasonable, such expectations may not occur. These forward-looking statements are made subject to certain risks and uncertainties that could cause actual results to differ materially from those stated. Risks and uncertainties that could cause or contribute to such differences include, without limitation, those discussed in the section entitled “Risk Factors” included in this prospectus and elsewhere in or incorporated by reference into this prospectus, including our Annual Report on Form 10-K for the fiscal year ended December 31, 2015, our Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2016 and our subsequent SEC filings and those factors summarized below:

Any of these factors and other factors contained in this prospectus, any prospectus supplement or any documents incorporated by reference could cause our actual results to differ materially from the results implied by these or any other forward-looking statements made by us or on our behalf. Although we believe our estimates and assumptions to be reasonable when made, they are inherently uncertain and involve a number of risks and uncertainties that are beyond our control. Our assumptions about future events may prove to be inaccurate. We caution you that the forward-looking statements contained in this prospectus are not guarantees of future performance, and we cannot assure you that those statements will be realized or the forward-looking events and circumstances will occur. All forward-looking statements speak only as of the date of this prospectus.

Reserve engineering is a process of estimating underground accumulations of oil, natural gas and natural gas liquids that cannot be measured in an exact way. The accuracy of any reserve estimate depends on the quality of available data, the interpretation of such data and price and cost assumptions made by reserve engineers. In addition, the results of drilling, testing and production activities may justify revisions of estimates that were made previously. If significant, such revisions would change the schedule of any further production and development drilling. Accordingly, reserve estimates may differ significantly from the quantities of oil, natural gas and natural gas liquids that are ultimately recovered.

We do not intend to publicly update or revise any forward-looking statements as a result of new information, future events or otherwise, except as required by law. These cautionary statements qualify all forward-looking statements attributable to us or persons acting on our behalf.

RISK FACTORS

An investment in our securities involves a high degree of risk. You should carefully consider the risk factors and all of the other information included in, or incorporated by reference into, this prospectus, including those included in our most recent Annual Report on Form 10-K and, if applicable, in our Quarterly Reports on Form 10-Q and Current Reports on Form 8-K, in evaluating an investment in our securities. If any of these risks were to occur, our business, financial condition or results of operations could be adversely affected. In that case, the trading price of our common stock could decline and you could lose all or part of your investment.

USE OF PROCEEDS

We will not receive any proceeds from the sale of shares of common stock offered under this prospectus. Any proceeds from the sale of shares of common stock under this prospectus will be received by the selling stockholders.

DESCRIPTION OF CAPITAL STOCK

The following descriptions are summaries of material terms of our common stock, preferred stock, certificate of incorporation and bylaws. This summary is qualified by reference to our certificate of incorporation, bylaws and the designations of our preferred stock, which are filed as exhibits to the registration statement of which this prospectus forms a part, and by the provisions of applicable law.

We are authorized to issue 50.0 million shares of common stock, par value $0.04 per share, and 5.0 million shares of preferred stock, par value $0.04 per share. As of January 27, 2017 there were 25,238,600 shares of our common stock issued and outstanding (including 638,158 shares of restricted common stock issued, pursuant to our equity compensation plans) and held by approximately 121 record owners.

Common Stock

Holders of common stock are entitled to one vote per share with respect to each matter presented to our stockholders on which the holders of common stock are entitled to vote. Because holders of common stock do not have cumulative voting rights, the holders of a majority of the outstanding shares of our common stock can elect all of the members of the board of directors standing for election, subject to the rights, powers and preferences of any outstanding series of preferred stock. No share of common stock affords any preemptive rights or is convertible, redeemable, assessable or entitled to the benefits of any sinking or repurchase fund.

Subject to the prior rights of holders of preferred stock, if any, holders of common stock are entitled to receive dividends as may be lawfully declared from time to time by our board of directors. Upon our liquidation, dissolution or winding up, whether voluntary or involuntary, holders of common stock will be entitled to receive such assets as are available for distribution to our stockholders after there shall have been paid or set apart for payment the full amounts necessary to satisfy any preferential or participating rights to which the holders of each outstanding series of preferred stock are entitled by the express terms of the series.

The shares of our common stock presently outstanding are fully paid and non-assessable, and any shares issued by us pursuant to this prospectus will be fully paid and non-assessable when issued. Our common stock trades on the NYSE MKT under the symbol “MCF.”

Preferred Stock

Our Board has the authority to issue preferred stock in one or more series and to fix the designations, powers, preferences and rights, and the qualifications, limitations or restrictions thereof including dividend rights, dividend rates, conversion rights, voting rights, terms of redemption, redemption prices, liquidation preferences and the number of shares constituting any class or series, without further vote or action by the stockholders. The issuance of preferred stock may have the effect of delaying, deferring or preventing a change in control of us without further action by the stockholders and may adversely affect the voting and other rights of the holders of common stock. Our preferred stock is senior to our common stock regarding liquidation. At present, we have no shares of preferred stock issued and outstanding.

Outstanding Options

At January 27, 2017, we had outstanding options for the purchase of approximately 111,905 shares of common stock at prices ranging from $28.96 to $60.33 per share, including employee stock. If we issue additional options, existing stockholders’ percentage ownership of us may be further diluted.

Anti-Takeover Provisions of our Certificate of Incorporation and By-laws

Certificate of Incorporation and Bylaws. Certain provisions in our certificate of incorporation and bylaws summarized below may be deemed to have an anti-takeover effect and may delay, deter, or prevent a tender offer

or takeover attempt that a stockholder might consider to be in its best interests, including attempts that might result in a premium being paid over the market price for the shares held by stockholders.

Our certificate of incorporation and bylaws contain provisions that (unless, as a general matter, a preferred stock designation provides otherwise for that series of preferred stock):

The foregoing provisions of our certificate of incorporation and bylaws could discourage potential acquisition proposals and could delay or prevent a change of control. These provisions are intended to enhance the likelihood of continuity and stability in the composition of the board of directors and in the policies formulated by the board of directors and to discourage certain types of transactions that may involve an actual or threatened change of control. These provisions are designed to reduce our vulnerability to an unsolicited acquisition proposal. The provisions also are intended to discourage certain tactics that may be used in proxy fights. However, such provisions could have the effect of discouraging others from making tender offers for our shares and, as a consequence, they also may inhibit fluctuations in the market price of our common stock that could result from actual or rumored takeover attempts. Such provisions also may have the effect of preventing changes in our management.

Business Combinations. We are subject to the provisions of Section 203 of the Delaware General Corporation Law. In general, Section 203 prohibits a publicly held Delaware corporation from engaging in a “business combination” with an “interested stockholder” for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the business combination is approved in a prescribed manner.

Section 203 defines a “business combination” as a merger, asset sale or other transaction resulting in a financial benefit to the interested stockholders. Section 203 defines an “interested stockholder” as a person who, together with affiliates and associates, owns, or, in some cases, within three years prior, did own, 15% or more of the corporation’s voting stock. Under Section 203, a business combination between us and an interested stockholder is prohibited unless:

which employee participants do not have the right to determine confidentially whether shares held under the plan will be tendered in a tender or exchange offer; or

This statutory provision has an anti-takeover effect with respect to transactions not approved in advance by our board of directors, including discouraging takeover attempts that might result in a premium over the market price for the shares of our common stock. With approval of our stockholders, we could amend our certificate of incorporation in the future to elect not to be governed by the anti-takeover law.

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is Continental Stock Transfer & Trust Company.

PLAN OF DISTRIBUTION

As of the date of this prospectus, we have not been advised by the selling stockholders as to any plan of distribution. Distributions of the common stock by the selling stockholders, or by its partners, pledgees, donees (including charitable organizations), transferees or other successors in interest, may from time to time be offered for sale either directly by such individual, or through underwriters, dealers or agents or on any exchange on which the common stock may from time to time be traded, in the over-the-counter market, or in independently negotiated transactions or otherwise. The methods by which the common stock may be sold include:

Such transactions may be effected by the selling stockholders at market prices prevailing at the time of sale or at negotiated prices. The selling stockholders may effect such transactions by selling the common stock to underwriters or to or through broker-dealers, and such underwriters or broker-dealers may receive compensation in the form of discounts or commissions from the selling stockholders and may receive commissions from the purchasers of the common stock for whom they may act as agent. The selling stockholders may agree to indemnify any underwriter, broker-dealer or agent that participates in transactions involving sales of common stock against certain liabilities, including liabilities arising under the Securities Act. We have agreed to register the shares for sale under the Securities Act and to indemnify the selling stockholders and each person who participates as an underwriter in the offering of common stock against certain civil liabilities, including certain liabilities under the Securities Act.

In connection with sales of the common stock under this prospectus, the selling stockholders may enter into hedging transactions with broker-dealers, who may in turn engage in short sales of the common stock in the course of hedging the positions they assume. The selling stockholders also may sell shares of common stock short and deliver them to close out the short positions, or loan or pledge the shares of common stock to broker-dealers that in turn may sell them.

The selling stockholders and any underwriters, broker-dealers or agents who participate in the distribution of the common stock may be deemed to be “underwriters” within the meaning of the Securities Act. To the extent any of the selling stockholders are broker-dealers, they are, according to SEC interpretation, “underwriters” within the meaning of the Securities Act. If any selling stockholder is deemed to be an underwriter, such selling stockholder may be subject to certain statutory liabilities under the Securities Act and the Securities Exchange Act of 1934.

The selling stockholders have advised us that they have not entered into any agreements, understandings or arrangements with any underwriters or broker-dealers regarding the sale of their shares. Upon our notification by a selling stockholder that any material arrangement has been entered into with an underwriter or broker-dealer for the sale of shares through a block trade, special offering, exchange distribution, secondary distribution or a purchase by an underwriter or broker-dealer, we will file a supplement to this prospectus, if required, pursuant to Rule 424(b) under the Securities Act, disclosing certain material information, including: the number of shares being offered, the name or names of any underwriters, dealers, or agents, the public offering price, any underwriting discounts, and other items constituting compensation to underwriters, dealers, or agents.

To the extent required, this prospectus may be supplemented from time to time to describe a specific plan of distribution. Instead of selling the shares of common stock under this prospectus, the selling stockholders may sell the shares of common stock in compliance with the provisions of Rule 144 under the Securities Act, if available, or pursuant to other available exemptions from the registration requirements of the Securities Act.

There can be no assurances that the selling stockholders will sell any or all of the common stock offered under this prospectus.

THE SELLING STOCKHOLDERS

This prospectus covers the offering for resale of up to 1,287,732 shares of our common stock by the selling stockholders identified below. No offer or sale may occur unless this prospectus has been declared effective by the SEC, and remains effective at the time such selling stockholders offer or sell such common stock. We are required to update this prospectus to reflect material developments in our business, financial position and results of operations.

The following table sets forth certain information regarding the selling stockholders’ beneficial ownership of our common stock as of January 27, 2016. The information presented below is based solely on our review of information provided by the selling stockholders.

Selling security holders who are registered broker-dealers are “underwriters” within the meaning of the Securities Act. In addition, selling security holders who are affiliates of registered broker-dealers are “underwriters” within the meaning of the Securities Act if such selling security holder (a) did not acquire its shares of common stock in the ordinary course of business or (b) had an agreement or understanding, directly or indirectly, with any person to distribute the common shares. To our knowledge, no selling security holder who is a registered broker-dealer or an affiliate of a registered broker-dealer received any securities as underwriting compensation.

Any prospectus supplement reflecting a sale of common stock hereunder will set forth, with respect to the selling stockholders:

Registration Rights Agreement

In connection with the execution of the merger agreement which provided for the acquisition of Crimson by Contango, we concurrently entered into a Registration Rights Agreement (the “Registration Rights Agreement”) with OCM GW Holdings, LLC, a Delaware limited liability company, and OCM Crimson Holdings, LLC, a Delaware limited liability company and the selling stockholders, dated as of April 29, 2013. The filing of this prospectus is pursuant to our obligations under the Registration Rights Agreement.

All expenses incurred with the registration of the common stock owned by the selling stockholders will be borne by us.

Relationships with the Selling Stockholders

Prior to our merger with Crimson, three members of the board of directors of Crimson were employees of Oaktree Capital Management, L.P., an affiliate of the selling stockholders. Currently, no member of our board of directors is an employee of Oaktree Capital Management, L.P. However, one member of our board, Mr. B. James Ford, is a Senior Advisor to Oaktree Capital Management, L.P.

LEGAL MATTERS

The validity of the securities will be passed upon for us by Vinson & Elkins L.L.P., Houston, Texas. Legal counsel to any underwriters may pass upon legal matters for such underwriters.

EXPERTS

The audited consolidated financial statements and management’s assessment of the effectiveness of internal control over financial reporting of Contango Oil & Gas Company incorporated by reference in this prospectus and elsewhere in the registration statement have been so incorporated by reference in reliance upon the reportsreport of Grant ThorntonKPMG LLP, independent registered public accountants,auditors, incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing.

The auditedaudit report covering the December 31, 2018 consolidated financial statements contains an explanatory paragraph that states that White Star Petroleum’s noncompliance with its debt covenants raise substantial doubt about the entity’s ability to continue as a going concern. The consolidated financial statements do not include any adjustments that might result from the outcome of Exaro Energy III LLC incorporated by reference in this prospectus and elsewhere in the registration statement have been so incorporated by reference in reliance upon the report of BDO USA, LLP, independent registered public accountants, upon the authority of said firm as experts in accounting and auditing.that uncertainty.

PARTPart II

INFORMATION NOT REQUIRED IN PROSPECTUSInformation not required in prospectus

SetItem 14. Other Expenses of Issuance and Distribution

The following table sets forth below are the expenses (other than underwriting discountscosts and commissions) expectedexpenses to be incurredborne by the Registrant in connection with the issuance and distribution of the securities registered hereby. The amounts set forth below are estimates.offerings described in this Registration Statement.

Contango Oil & Gas CompanyItem 15. Indemnification of Directors and Officers

Crimson Exploration Inc.

Crimson Exploration Operating, Inc.

Contango Energy Company

Contango Operators, Inc.

Contango Mining Company

Conterra Company

Contaro Company

Contango Alta Investments, Inc.

Contango Venture Capital Corporation

Contango Rocky Mountain Inc.

Section 102Sections 8.101 and 8.105 of the Delaware General Corporation LawTexas Business Organizations Code (“DGCL”TBOC”) allowspermit corporations to indemnify a corporation to eliminate or limit the personal liability of directors of a corporation to the corporation or to its stockholders for monetary damages for a breach of fiduciary duty as a director, except (i) for breach of the director’s duty of loyalty, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) for certain unlawful dividends and stock repurchases or (iv) for any transaction from which the director derived an improper personal benefit.

Section 145 of the DGCL provides that in the case of any action other than one by or in the right of the corporation, a corporation may indemnify any person who was or is a partygoverning person, officer, employee or agent of such corporation or who serves at the corporation’s request as a representative of another enterprise, organization or employee benefit plan (an “outside enterprise”), who was, is, or is threatened to be madenamed a party to any threatened, pending or completed action, suit orrespondent in a legal proceeding whether civil, criminal, administrative or investigative, by reasonvirtue of the fact that such person is or was a director, officer, employee or agent ofperson’s position in the corporation or is or was serving atin an outside enterprise, but only if the request of the corporation in such capacity on behalf of another corporation, partnership, joint venture, trust or other enterprise, against expenses (including attorneys’ fees),

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judgments, fines and amounts paid in settlement actually and reasonably incurred by him in connection with such action if heperson acted in good faith and in a manner he reasonably believed, to bein the case of conduct in the person’s official capacity, that the conduct was in or, in the case of all other conduct, that the conduct was not opposed to the corporation or outside enterprise’s best interestsinterest, and, in the case of a criminal proceeding, the corporation and, with respect to any criminal action or proceeding,person had no reasonable cause to believe histhe conduct was unlawful.

Section 145 of A person may be indemnified within the DGCL providesabove limitations against judgment and expenses that are reasonable and actually incurred by the person in connection with the case of an action by orproceeding; however, indemnification is limited to reasonable expenses actually incurred in the right of a corporation to procure a judgmentproceeding in its favor, a corporation may indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending or completed action or suit by reason ofwhich the fact that such person is or was a director, officer, employee or agent offound liable to the corporation or is or was serving at the request of the corporation in such capacity on behalf of another corporation, partnership, joint venture, trust or other enterprise, against expenses (including attorneys’ fees) actuallyfound to have improperly received a personal benefit and reasonably incurred by him in connection with the defense or settlement of such action or suit if he acted under standards similar to those set forth in the preceding paragraph, except that no indemnification mayshall not be made in respect of any action or claim as toproceeding in which suchthe person shall have been adjudged to befound liable for willful or intentional misconduct in the performance of the person’s duty to the corporation, unless and onlybreach of the person’s duty of loyalty owed to the extentcorporation or an act or omission not committed in good faith that constitutes a court determinesbreach of a duty owed by the person to the corporation. Indemnification pursuant to Section 8.101 of the TBOC can be made by the corporation only upon a determination made in the manner prescribed by Section 8.103 of the TBOC that indemnification is proper in the circumstances because the party seeking indemnification has met the applicable standard of conduct for such indemnification.

Under certain circumstances, a corporation may also advance expenses to any of the above persons. Section 8.151 of the TBOC also permits a corporation to purchase and maintain insurance or to make other arrangements to indemnify and hold harmless such persons against any liability asserted against and incurred by the person is fairly and reasonably entitledin such capacity, or arising out of the person’s status as such a person, without regard to indemnification.whether the corporation would have the power to indemnify the person against the liability under applicable law.

The Certificate of IncorporationFormation and Bylaws of each of Contango, Crimson Exploration Inc., Crimson Exploration Operating, Inc., Contango Energythe Company Contango Operators, Inc., Contango Mining Company, Conterra Company, Contaro Company, Contango Alta Investments, Inc., Contango Venture Capital Corporation and Contango Rocky Mountain Inc. provide for indemnification of the respective officers and directors to the fullest extent permitted by applicable law. Applicable law permits indemnification for all matters (including those asserted in derivative actions) except for those determined by a court to have constituted willful misconduct or recklessness.

ContangoThe Company has obtained directors’ and officers’ liability insurance with respect to liabilities arising out of certain matters, including matters arising under the Securities Act.

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Insofar as indemnification for liabilities arising under the Securities Act of 1933 (the “Securities Act”) may be permitted to our directors, officers and controlling persons pursuant to the foregoing provisions, or otherwise, we have been informed that in the opinion of the SEC, such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable.

The following documents are filed as exhibits to this registration statement:

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provided, however, that paragraphs (1)(i), (ii) and (1)(ii)(iii) above do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in periodic reports filed with or furnished to the Securities and Exchange Commission by registrantsthe registrant pursuant to sectionSection 13 or sectionSection 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in thethis registration statement, or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.

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The undersigned registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on January 27, 2017.May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Allan D. KeelWilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on January 27, 2017.May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Allan D. KeelWilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on January 27, 2017.May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Allan D. KeelWilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on January 27, 2017.May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Allan D. KeelWilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on January 27, 2017.May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Allan D. KeelWilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on January 27, 2017.May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Allan D. KeelWilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on January 27, 2017.May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Allan D. KeelWilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on January 27, 2017.May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Allan D. KeelWilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on January 27, 2017.May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Allan D. KeelWilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on January 27, 2017.May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Allan D. KeelWilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on January 27, 2017.May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Allan D. KeelWilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Wilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on FormS-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on May 12, 2020.

Each person whose signature appears below hereby constitutes and appoints Wilkie S. Colyer, Jr. and E. Joseph Grady, and each of them, any of whom may act without the joinder of the other, as his true and lawfulattorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign on his behalf individually and in each capacity stated below any and all amendments (including post-effective amendments) to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that saidattorneys-in-fact and agents and either of them, or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

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INDEX TO EXHIBITS

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