UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

Filed by the Registrant  ☒                             Filed by a Party other than the Registrant  ☐

Check the appropriate box:

NEWFIELD EXPLORATION COMPANY

(Exact name of registrant as specified in its charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

MERGER PROPOSED—YOUR VOTE IS IMPORTANT

Dear Shareholders of Encana Corporation and Stockholders of Newfield Exploration Company:

On October 31, 2018, Encana Corporation, a Canadian corporation (“Encana”), Neapolitan Merger Corp., a Delaware corporation and an indirect, wholly-owned subsidiary of Encana (“Merger Sub”), and Newfield Exploration Company, a Delaware corporation (“Newfield”), entered into an Agreement and Plan of Merger (the “merger agreement”), providing for the merger of Merger Sub with and into Newfield, with Newfield surviving the merger as an indirect, wholly-owned subsidiary of Encana (the “merger”).

In connection with the merger, Encana will issue Encana common shares to stockholders of Newfield (the “share issuance”). Under the rules of the New York Stock Exchange (the “NYSE”) and the Toronto Stock Exchange (the “TSX”), Encana is required to obtain Encana shareholder approval of the share issuance. Accordingly, Encana will hold a special meeting of shareholders (the “Encana special meeting”) to vote on the share issuance (the “share issuance proposal”). At the Encana special meeting, Encana shareholders will also vote on a proposal to approve the adjournment of the Encana special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the share issuance proposal (the “Encana adjournment proposal”). Approval of each of these proposals requires the affirmative vote of a majority of votes cast by Encana shareholders entitled to vote thereon and present in person or represented by proxy at the Encana special meeting.

The Encana special meeting will be held on February 12, 2019 at the Oddfellows Building, Ballroom (Floor 4), 100 – 6th Avenue S.W., Calgary, Alberta, at 8:00 a.m., Mountain Time. The Encana board of directors (the “Encana board”) unanimously recommends that Encana shareholders vote “FOR” the share issuance proposal and “FOR” the Encana adjournment proposal.

In addition, under the laws of the State of Delaware and pursuant to Newfield’s bylaws, Newfield is required to obtain Newfield stockholder approval of the adoption of the merger agreement and related matters as described in the attached joint proxy statement/prospectus. Accordingly, Newfield will hold a special meeting of Newfield stockholders (the “Newfield special meeting”) to vote to adopt the merger agreement (the “merger agreement proposal”). Approval of the merger agreement proposal requires the affirmative vote, in person or by proxy, of the holders of at least 66²⁄₃% of the issued and outstanding shares of Newfield common stock entitled to vote thereon. At the Newfield special meeting, Newfield stockholders will also vote on proposals to approve (i) on an advisory (non-binding) basis, the compensation that may be paid or become payable to Newfield’s named executive officers in connection with the merger (the “non-binding compensation advisory proposal”), which is not a condition to the merger, and (ii) the adjournment of the Newfield special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to adopt the merger agreement (the “Newfield adjournment proposal”). Approval of each of the non-binding compensation advisory proposal and the Newfield adjournment proposal requires the affirmative vote of a majority of votes cast by Newfield stockholders entitled to vote thereon and present in person or represented by proxy at the Newfield special meeting.

The Newfield special meeting will be held on February 12, 2019 at the Four Seasons Hotel, Fairfield Ballroom, 1300 Lamar St., Houston, Texas 77010 at 9:00 a.m., Central Time. The Newfield board of directors (the “Newfield board”) unanimously recommends that Newfield stockholders vote “FOR” the merger agreement proposal, “FOR” the non-binding compensation advisory proposal and “FOR” the Newfield adjournment proposal.

If the merger is completed, each issued and outstanding share of Newfield common stock (with certain exceptions described in the accompanying joint proxy statement/prospectus) will convert into the right to receive 2.6719 Encana common shares with cash paid in lieu of the issuance of fractional Encana common shares, if any. Although the number of Encana common shares that Newfield stockholders will receive is fixed, the market value of the merger consideration will fluctuate with the market price of Encana common shares and will not be known at the time Newfield stockholders vote to adopt the merger agreement or at the time Encana shareholders vote to approve the share issuance. Based on the closing price of the Encana common shares on the NYSE on October 31, 2018, the last trading day before the public announcement of the parties entering into the merger agreement, the 2.6719 exchange ratio represented approximately $27.36 in value for each share of Newfield common stock. Based on the closing price of the Encana common shares on the NYSE on January 7, 2019, the last practicable trading day before the date of the joint proxy statement/prospectus accompanying this notice, the 2.6719 exchange ratio represented approximately $16.78 in value for each share of Newfield common stock. Based upon the estimated number of Encana common shares and shares of Newfield common stock as well as the outstanding equity of the parties that will be outstanding immediately prior to the consummation of the merger, we estimate that, upon consummation of the merger, existing Encana shareholders will hold approximately 63.5% and former Newfield stockholders will hold approximately 36.5% of the issued and outstanding Encana common shares. We urge you to obtain current market quotations for Encana (trading symbol “ECA”) and Newfield (trading symbol “NFX”).

The obligations of Encana and Newfield to complete the merger are subject to the satisfaction or waiver of a number of conditions set forth in the merger agreement, a copy of which is included as Annex A to the attached joint proxy statement/prospectus. The attached joint proxy statement/prospectus describes the Encana special meeting, the Newfield special meeting, the merger, the documents and agreements related to the merger, the share issuance and other related matters. It also contains or references information about Encana and Newfield and certain related agreements and matters. Please carefully read this entire joint proxy statement/prospectus, including “Risk Factors,” beginning on page 39, for a discussion of the risks relating to the proposed merger. You also can obtain information about Encana and Newfield from documents that each has filed with the Securities and Exchange Commission.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of the securities to be issued in connection with the merger described in this joint proxy statement/prospectus or determined if this joint proxy statement/prospectus is accurate or complete. Any representation to the contrary is a criminal offense.

This joint proxy statement/prospectus is dated January 8, 2019 and is first being mailed to Encana shareholders of record and Newfield stockholders of record on or about January 8, 2019.

ENCANA CORPORATION

Suite 4400, 500 Centre Street S.E., P.O. Box 2850

Calgary, Alberta, Canada, T2P 2S5

NOTICE OF SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON FEBRUARY 12, 2019

This is a notice that a special meeting (the “Encana special meeting”) of shareholders (“Encana shareholders”) of Encana Corporation, a Canadian corporation (“Encana”), will be held on February 12, 2019 at the Oddfellows Building, Ballroom (Floor 4), 100 – 6th Avenue S.W., Calgary, Alberta, at 8:00 a.m., Mountain Time. This special meeting will be held for the following purposes:

This joint proxy statement/prospectus describes the proposals listed above in more detail. Please refer to the attached document, including the merger agreement and all other annexes and any documents incorporated by reference, for further information with respect to the business to be transacted at the Encana special meeting. You are encouraged to read the entire document carefully before voting. In particular, see the section entitled “The Merger” beginning on page 61 for a description of the transactions contemplated by the merger agreement, including the share issuance contemplated by the share issuance proposal, and the section entitled “Risk Factors” beginning on page 39 for an explanation of the risks associated with the merger and the other transactions contemplated by the merger agreement, including the share issuance.

The Encana board of directors (the “Encana board”) has (i) unanimously determined that the terms of the merger agreement and the transactions contemplated thereby, including the merger and the share issuance, are in the best interests of Encana, (ii) unanimously approved the execution and delivery by Encana of the merger agreement, the performance by Encana of its covenants and agreements contained therein and the consummation of the transactions contemplated by the merger agreement, including the merger and the share issuance, upon the terms and subject to the conditions therein, (iii) unanimously directed that the merger agreement be submitted to Encana shareholders at the Encana special meeting to approve the share issuance, and (iv) unanimously resolved to recommend that Encana shareholders approve the share issuance. The Encana board recommends that Encana shareholders vote “FOR” the share issuance proposal and “FOR” the Encana adjournment proposal.

The Encana board has fixed January 8, 2019 as the record date for determination of Encana shareholders entitled to receive notice of, and to vote at, the Encana special meeting or any adjournments or postponements thereof. Only Encana shareholders of record at the close of business on the record date are entitled to receive notice of, and to vote at, the Encana special meeting.

YOUR VOTE IS VERY IMPORTANT REGARDLESS OF THE NUMBER OF SHARES THAT YOU OWN. The merger between Encana and Newfield cannot be completed without the approval of the share issuance proposal by the affirmative vote of a majority of votes cast by Encana shareholders entitled to vote thereon and present in person or represented by proxy at the Encana special meeting.

Whether or not you expect to attend the Encana special meeting in person, we urge you to submit a proxy to have your shares voted as promptly as possible by either: (1) logging onto the website shown on your proxy card and following the instructions to vote online; (2) dialing the toll-free number shown on your proxy card and following the instructions to vote by phone; or (3) signing and returning the enclosed proxy card in the postage-paid envelope provided, so that your shares may be represented and voted at the Encana special meeting. Even if you plan to attend the Encana special meeting in person, we request that you complete, sign, date and return the enclosed proxy card and thus ensure that your Encana common shares will be represented at the Encana special meeting if you are unable to attend.

If your shares are held in the name of a broker, bank, trustee or other nominee, please follow the instructions on the voting instruction form furnished by such broker, bank, trustee or other nominee, as appropriate. If you have any questions concerning the share issuance proposal or the other transactions contemplated by the merger agreement or this joint proxy statement/prospectus, would like additional copies or need help voting your Encana common shares, please contact Encana’s proxy solicitors:

1407 Broadway, 27th Floor

New York, New York 10018

Call Collect: 1-212-929-5500

Call Toll-Free: 1-800-322-2885

E-mail: Encana@mackenziepartners.com

130 King Street West, Suite 2950, P.O. Box 361

Toronto, Ontario M5X 1E2

Call Toll-Free (within North America): 1-866-229-8166

Call Collect (outside North America): 1-416-867-2272

E-mail: contactus@kingsdaleadvisors.com

By order of the Board of Directors of Encana Corporation

Nancy L. Brennan

Corporate Secretary

NEWFIELD EXPLORATION COMPANY

4 Waterway Square Place Suite 100

The Woodlands, Texas 77380

NOTICE OF SPECIAL MEETING OF STOCKHOLDERS TO BE HELD ON FEBRUARY 12, 2019

This is a notice that a special meeting (the “Newfield special meeting”) of stockholders (“Newfield stockholders”) of Newfield Exploration Company, a Delaware corporation (“Newfield”), will be held on February 12, 2019 at the Four Seasons Hotel, Fairfield Ballroom, 1300 Lamar St., Houston, Texas 77010 at 9:00 a.m., Central Time. This special meeting will be held for the following purposes:

This joint proxy statement/prospectus describes the proposals listed above in more detail, as well as other matters contemplated in connection with the proposed merger. Please refer to the attached document, including the merger agreement and all other annexes and including any documents incorporated by reference, for further information with respect to the business to be transacted at the Newfield special meeting. You are encouraged to read the entire document carefully before voting. In particular, see the section entitled “The Merger” beginning on page 61 for a description of the transactions contemplated by the merger agreement, and the section entitled “Risk Factors” beginning on page 39 for an explanation of the risks associated with the merger and the other transactions contemplated by the merger agreement.

Newfield’s board of directors (the “Newfield board”) has (i) unanimously determined that the terms of the merger agreement and the transactions contemplated thereby, including the merger, are advisable, fair to, and in the best interests of, Newfield and Newfield stockholders, (ii) unanimously approved and declared advisable the merger agreement and the transactions contemplated by the merger agreement, including the merger, (iii) unanimously approved the execution and delivery by Newfield of the merger agreement, the performance by Newfield of its covenants and agreements contained therein and the consummation of the transactions contemplated by the merger agreement, including the merger, upon the terms and subject to the conditions contained therein, (iv) unanimously directed that the merger agreement be submitted to Newfield stockholders at the Newfield special meeting to approve its adoption, (v) taken all actions necessary so that the restrictions on business combinations and stockholder vote requirements contained in Section 203 of the Delaware General Corporation Law and any other applicable

law with respect to a “moratorium,” “control share acquisition,” “business combination,” “fair price” or other forms of anti-takeover laws that may purport to be applicable will not apply with respect to or as a result of the entry into the merger agreement and the consummation of the transactions contemplated thereby, including the merger, and (vi) unanimously resolved to recommend that Newfield stockholders approve the adoption of the merger agreement.

The Newfield board recommends that Newfield stockholders vote “FOR” the merger agreement proposal, “FOR” the non-binding compensation advisory proposal and “FOR” the Newfield adjournment proposal.

The Newfield board has fixed January 8, 2019 as the record date for determination of Newfield stockholders entitled to receive notice of, and to vote at, the Newfield special meeting or any adjournments or postponements thereof. Only Newfield stockholders of record at the close of business on the record date are entitled to receive notice of, and to vote at, the Newfield special meeting.

A complete list of registered Newfield stockholders entitled to vote at the Newfield special meeting will be available for inspection at the principal place of business of Newfield at 4 Waterway Square Place, Suite 100, The Woodlands, Texas 77380, during regular business hours for a period of no less than ten (10) days before the Newfield special meeting and at the place of the Newfield special meeting during the meeting.

YOUR VOTE IS VERY IMPORTANT REGARDLESS OF THE NUMBER OF SHARES THAT YOU OWN. The merger between Newfield and Encana cannot be completed without the adoption of the merger agreement by the affirmative vote, in person or by proxy, of the holders of at least 66²⁄₃% of the issued and outstanding shares of Newfield common stock entitled to vote on the merger agreement proposal as of the record date for the Newfield special meeting.

Whether or not you expect to attend the Newfield special meeting in person, we urge you to submit a proxy to have your shares voted as promptly as possible by either: (1) logging onto the website shown on your proxy card and following the instructions to vote online; (2) dialing the toll-free number shown on your proxy card and following the instructions to vote by phone; or (3) signing and returning the enclosed proxy card in the postage-paid envelope provided, so that your shares may be represented and voted at the Newfield special meeting.

Even if you plan to attend the Newfield special meeting in person, we request that you complete, sign, date and return the enclosed proxy card and thus ensure that your Newfield common stock will be represented at the Newfield special meeting if you are unable to attend.

If your stock is held in a Newfield plan or in the name of a broker, bank, trustee or other nominee, please follow the instructions on the voting instruction form furnished by the plan administrator or such broker, bank, trustee or other nominee, as appropriate. If you have any questions concerning the merger agreement proposal or the other transactions contemplated by the merger agreement or this joint proxy statement/prospectus, would like additional copies or need help voting your shares of Newfield common stock, please contact Newfield’s proxy solicitor:

Innisfree M&A Incorporated

501 Madison Avenue, 20th Floor

New York, New York 10022

Call Toll-Free: 1-888-750-5834

Banks and Brokers Call Collect: 1-212-750-5833

By order of the Board of Directors of Newfield Exploration Company

Lee K. Boothby

Chairman, President and Chief Executive Officer

ADDITIONAL INFORMATION

Both Encana and Newfield file annual, quarterly and current reports, proxy statements and other business and financial information with the U.S. Securities and Exchange Commission (the “SEC”). Financial information about Encana and Newfield is provided in each company’s annual financial statements and accompanying management’s discussion and analysis for the year ended December 31, 2017 and the nine months ended September 30, 2018.You may read and copy any materials that either Encana or Newfield files with the SEC at the SEC’s Public Reference Room at 100 F Street, N.E., Room 1580, Washington, D.C. 20549. Please call the SEC at (800) 732-0330 for further information on the Public Reference Room. In addition, Encana and Newfield file reports and other business and financial information with the SEC electronically, and the SEC maintains a website located at http://www.sec.gov containing this information. Such information regarding Encana is also available under Encana’s profile on the System for Electronic Document Analysis and Retrieval at www.sedar.com . You can also obtain these documents, free of charge, from Encana at https://www.encana.com/investors/financial/ or from Newfield at http://ir.newfield.com. The information contained on, or that may be accessed through, Encana’s and Newfield’s websites is not incorporated by reference into, and is not a part of, this joint proxy statement/prospectus.

Encana has filed a registration statement on Form S-4 with respect to the Encana common shares to be issued in the merger, of which this joint proxy statement/prospectus forms a part. This joint proxy statement/prospectus constitutes the prospectus of Encana filed as part of the registration statement. As permitted by SEC rules, this joint proxy statement/prospectus does not contain all of the information included in the registration statement or in the exhibits or schedules to the registration statement. You may read and copy the registration statement, including any amendments, schedules and exhibits in the SEC’s reading room at the address set forth above or at the SEC’s website mentioned above. Statements contained in this joint proxy statement/prospectus as to the contents of any contract or other documents referred to in this joint proxy statement/prospectus are not necessarily complete. In each case, you should refer to the copy of the applicable agreement or other document filed as an exhibit to the registration statement. This joint proxy statement/prospectus incorporates important business and financial information about Encana and Newfield from documents that are not attached to this joint proxy statement/prospectus. This information is available to you without charge upon your request. You can obtain the documents incorporated by reference into this joint proxy statement/prospectus, including copies of financial statements and management’s discussion and analysis, free of charge by requesting them in writing or by telephone from the appropriate company or its proxy solicitors at the following addresses and telephone numbers:

If you would like to request any documents, please do so by February 6, 2019 in order to receive them before the Encana special meeting or the Newfield special meeting, as applicable.

For a more detailed description of the information incorporated by reference into this joint proxy statement/prospectus and how you may obtain it, see “Where You Can Find More Information” beginning on page 196.

ABOUT THIS JOINT PROXY STATEMENT/PROSPECTUS

This joint proxy statement/prospectus, which forms part of a registration statement on Form S-4 filed with the SEC by Encana, constitutes a prospectus of Encana under the Securities Act of 1933, as amended, with respect to the Encana common shares, to be issued to Newfield stockholders in connection with the merger. This joint proxy statement/prospectus also constitutes a joint proxy statement for both Newfield and Encana under the Securities Exchange Act of 1934, as amended. This joint proxy statement/prospectus also constitutes a notice of meeting with respect to the special meeting of Encana shareholders and a notice of meeting with respect to the special meeting of Newfield stockholders.

You should rely only on the information contained in or incorporated by reference into this joint proxy statement/prospectus. No one has been authorized to provide you with information that is different from that contained in, or incorporated by reference into, this joint proxy statement/prospectus. This joint proxy statement/prospectus is dated January 8, 2019, and you should assume that the information contained in this joint proxy statement/prospectus is accurate only as of such date. You should also assume that the information incorporated by reference into this joint proxy statement/prospectus is only accurate as of the date of such information.

This joint proxy statement/prospectus does not constitute an offer to sell, or a solicitation of an offer to buy, any securities, or the solicitation of a proxy in any jurisdiction to or from any person to whom it is unlawful to make any such offer or solicitation in such jurisdiction. Information contained in this joint proxy statement/prospectus regarding Encana has been provided by Encana and information contained in this joint proxy statement/prospectus regarding Newfield has been provided by Newfield.

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QUESTIONS AND ANSWERS

The following are some questions that you, as a shareholder (“Encana shareholder”) of Encana Corporation (“Encana”) or a stockholder (“Newfield stockholder”) of Newfield Exploration Company (“Newfield”), may have regarding the merger, the issuance of common shares of Encana, without par value (“Encana common shares”), to Newfield stockholders in connection with the merger and other matters being considered at the special meetings of Encana shareholders and Newfield stockholders (the “Encana special meeting” and the “Newfield special meeting,” respectively) and the answers to those questions. Encana and Newfield urge you to carefully read the remainder of this joint proxy statement/prospectus because the information in this section does not provide all the information that might be important to you with respect to the merger, the issuance of Encana common shares in connection with the merger and the other matters being considered at the Encana special meeting and the Newfield special meeting. Additional important information is also contained in the annexes to and the documents incorporated by reference into this joint proxy statement/prospectus.

In order to complete the merger, Encana shareholders must approve the proposal to issue Encana common shares (such issuance, the “share issuance”) to Newfield stockholders pursuant to the merger agreement (the “share issuance proposal”), and Newfield stockholders must approve the proposal to adopt the merger agreement (the “merger agreement proposal”), and all other conditions to the merger must be satisfied or waived.

Encana and Newfield will hold separate special meetings to obtain these approvals and vote on other related matters, including, in the case of Newfield, a vote to approve, on an advisory (non-binding) basis, the compensation that may be paid or become payable to Newfield’s named executive officers in connection with the merger (the “non-binding compensation advisory proposal”).

This joint proxy statement/prospectus, which you should read carefully, contains important information about the merger, the share issuance and other matters being considered at the Encana special meeting and the Newfield special meeting.

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In addition, Newfield will take all actions as may be necessary so that at the effective time, each outstanding restricted stock award, time-based restricted stock unit award, performance-based restricted stock unit award and share of notional stock in respect of Newfield common stock will be treated as described in “The Merger—Treatment of Newfield Equity Awards in the Merger” beginning on page 134.

For additional information regarding the consideration to be received in the merger, see the section entitled “The Merger—Effects of the Merger.”

Restricted Stock Awards: All outstanding Newfield restricted stock awards will be cancelled and each holder of Newfield restricted stock will be entitled to receive, on a fully vested basis, for each share of restricted stock subject to any such award, the merger consideration.

Time-Based Restricted Stock Units with a Cash Settlement Feature: All outstanding Newfield time-based restricted stock units with a cash settlement feature will be cancelled and each holder of such restricted stock units will be entitled to receive, on a fully vested basis, for each such restricted stock unit, a cash payment of equivalent value to the merger consideration, based on the volume weighted averages of the trading price of Encana common shares on each of the five consecutive trading days ending on the trading day that is three trading days prior to the effective time of the merger.

Time-Based Restricted Stock Units with a Stock Settlement Feature: All outstanding Newfield time-based restricted stock units with a stock settlement feature will be cancelled and each holder of such restricted stock units will be entitled to receive, on a fully vested basis for each such restricted stock unit, the merger consideration.

Performance-Based Restricted Stock Units: All outstanding Newfield performance-based restricted stock units will be cancelled and will convert into the right to receive the merger consideration, with the performance-based vesting conditions applicable to such Newfield performance-based restricted stock units deemed achieved based on the determination of the compensation and management development committee (“Newfield compensation committee”) of the Newfield board of directors (the “Newfield board”), not to exceed 200% per Newfield performance-based restricted stock unit.

Notional Stock: Any shares of Newfield notional stock held in connection with Newfield’s Nonqualified Deferred Compensation Plan will convert into the right to receive a cash payment of equivalent value to the

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merger consideration, based on the volume weighted averages of the trading price of Encana common shares on each of the five consecutive trading days ending on the trading day that is three trading days prior to the effective time of the merger.

For additional information regarding the treatment of Newfield equity awards, see the section entitled “The Merger—Treatment of Newfield Equity Awards in the Merger” beginning on page 134.

Encana. Approval of the share issuance proposal requires the affirmative vote of a majority of votes cast by Encana shareholders entitled to vote thereon and present in person or represented by proxy at the Encana special meeting. Abstentions are considered Encana common shares present and entitled to vote and will have the same effect as a vote “against” the share issuance proposal. The failure of any Encana shareholder to submit a vote will not be counted in determining the votes cast in connection with this proposal and therefore will have no effect on the outcome of the share issuance proposal. Approval of the proposal to adjourn the Encana special meeting, if necessary or appropriate, to solicit additional proxies in favor of the share issuance proposal if there are not sufficient votes at the time of such adjournment to approve the share issuance (the “Encana adjournment proposal”) requires the affirmative vote of a majority of votes cast by Encana shareholders entitled to vote thereon and present in person or represented by proxy at the Encana special meeting. Failure to vote and abstentions will not be counted as votes cast “for” or “against” the Encana adjournment proposal.

Newfield. Approval of the merger agreement proposal requires the affirmative vote, in person or by proxy, of the holders of at least 66²⁄₃% of the issued and outstanding shares of Newfield common stock entitled to vote thereon. The failure of any Newfield stockholder to submit a vote, or any abstention, will have the same effect as voting against the merger agreement proposal. Approval of the non-binding compensation advisory proposal requires the affirmative vote of a majority of votes cast by holders of the issued and outstanding shares of Newfield common stock entitled to vote thereon and present in person or represented by proxy at the Newfield special meeting. Abstentions are considered shares of Newfield common stock present and entitled to vote and will have the same effect as votes “against” the non-binding compensation advisory proposal. Since the non-binding compensation advisory proposal is not binding, if the merger agreement is adopted by Newfield stockholders and the merger is completed, the compensation that is the subject of the non-binding compensation advisory proposal, which includes amounts Encana or Newfield are contractually obligated to pay, would still be paid regardless of the outcome of the advisory (non-binding) vote. Approval of the proposal to adjourn the Newfield special meeting, if necessary or appropriate, to solicit additional proxies in favor of the merger agreement proposal if there are not sufficient votes at the time of such adjournment to adopt the merger agreement (the “Newfield adjournment proposal”) requires the affirmative vote of a majority of votes cast by holders of the issued and outstanding

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shares of Newfield common stock entitled to vote thereon and present in person or represented by proxy at the Newfield special meeting. Abstentions are considered shares of Newfield common stock present and entitled to vote and will have the same effect as votes “against” the Newfield adjournment proposal.

Accordingly, the Encana board unanimously recommends that Encana shareholders vote “FOR” the share issuance proposal and “FOR” the Encana adjournment proposal.

The Newfield board, after considering the various factors described under “The Merger—Recommendation of the Newfield Board and Reasons for the Merger,” the comprehensive process conducted by the Newfield board and the alternatives to the merger (including remaining as a stand-alone company), has (i) unanimously determined that the terms of the merger agreement and the transactions contemplated thereby, including the merger, are advisable, fair to, and in the best interests of, Newfield and Newfield stockholders, (ii) unanimously approved and declared advisable the merger agreement and the transactions contemplated by the merger agreement, including the merger, (iii) unanimously approved the execution and delivery by Newfield of the merger agreement, the performance by Newfield of its covenants and agreements contained therein and the consummation of the transactions contemplated by the merger agreement, including the merger, upon the terms and subject to the conditions contained therein, (iv) unanimously directed that the merger agreement be submitted to Newfield stockholders at the Newfield special meeting to approve its adoption, (v) taken all actions necessary so that the restrictions on business combinations and stockholder vote requirements contained in Section 203 of the Delaware General Corporation Law (the “DGCL”) and any other applicable law with respect to a “moratorium,” “control share acquisition,” “business combination,” “fair price” or other forms of anti-takeover laws that may purport to be applicable will not apply with respect to or as a result of the entry into the merger agreement and the consummation of the transactions contemplated thereby, including the merger, and (vi) unanimously resolved to recommend that Newfield stockholders approve the adoption of the merger agreement.

Accordingly, the Newfield board recommends that you vote “FOR” the merger agreement proposal, “FOR” the non-binding compensation advisory proposal and “FOR” the Newfield adjournment proposal.

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Under specified circumstances, Newfield and/or Encana may be required to reimburse the other party’s expenses or pay a termination fee upon termination of the merger agreement, as described under “The Merger Agreement—Expenses and Termination Fees Relating to the Termination of the Merger Agreement.”

Each outstanding share of Newfield common stock entitles its holder of record to one vote on each matter to be considered at the Newfield special meeting. Only Newfield stockholders who held shares of Newfield common stock at the close of business on January 8, 2019 are entitled to vote at the Newfield special meeting and any adjournment or postponement of the Newfield special meeting, so long as such shares remain outstanding on the date of the Newfield special meeting.

All Newfield stockholders who hold shares of Newfield common stock of record at the close of business on January 8, 2019, the record date for the Newfield special meeting, are entitled to receive notice of and to vote at the Newfield special meeting.

A quorum at the Encana special meeting requires the presence of at least two persons present in person, each being an Encana shareholder or duly appointed proxyholder of an Encana shareholder, together holding at least 25% of the total issued and outstanding Encana common shares entitled to vote at the Encana special meeting.

A quorum at the Newfield special meeting requires the presence, in person or by proxy, of holders of a majority of the issued and outstanding shares of Newfield common stock entitled to vote at the Newfield special meeting.

Additional information on voting procedures can be found under the section entitled “Encana Special Meeting” and under the section entitled “Newfield Special Meeting.”

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Additional information on voting procedures can be found under the section entitled “Encana Special Meeting” and under the section entitled “Newfield Special Meeting.”

If you are a beneficial owner of Encana common shares or a beneficial owner of Newfield common stock, you are also invited to attend the Encana special meeting or the Newfield special meeting, as applicable. However, because you are not the Encana shareholder of record or Newfield stockholder of record, as applicable, you may not vote your shares in person at the Encana special meeting or the Newfield special meeting, as applicable, unless you request and obtain a proxy issued in your own name from your bank, broker or nominee.

If you appoint a non-management proxyholder, please make sure they are aware and ensure they will attend the applicable special meeting with the proper authority from you, the Encana shareholder or Newfield stockholder, as applicable, for your vote to count.

Additional information on attending the Encana special meeting and the Newfield special meeting can be found under the section entitled “Encana Special Meeting” and under the section entitled “Newfield Special Meeting.”

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If your Encana common shares or Newfield common stock are held through a bank, broker or other nominee, you are considered the beneficial owner of the Encana common shares or Newfield common stock held in “street name.” In that case, this proxy statement has been forwarded to you by your bank, broker or other nominee. As the beneficial owner, you have the right to direct your bank, broker or other nominee how to vote your shares by following their instructions for voting, and you are also invited to attend in person the Encana special meeting or the Newfield special meeting, as applicable. However, because you are not the Encana shareholder or Newfield stockholder of record, you may not vote your Encana common shares in person at the Encana special meeting or your shares of Newfield common stock at the Newfield special meeting, as applicable, unless you request and obtain a proxy issued in your own name from your bank, broker or nominee.

If you appoint a non-management proxyholder, please make sure they are aware and ensure they will attend the applicable special meeting with the proper authority from you, the Encana shareholder or Newfield stockholder, for your vote to count.

You should instruct your broker, bank or other nominee how to vote your Encana common shares or shares of Newfield common stock, as applicable. Under the rules applicable to broker-dealers, your broker, bank or other nominee does not have discretionary authority to vote your shares on any of the proposals scheduled to be voted on at the Encana special meeting or the Newfield special meeting. A so-called “broker non-vote” results when banks, brokers and other nominees return a valid proxy voting upon a matter or matters for which the applicable rules provide discretionary authority but do not vote on a particular proposal because they do not have discretionary authority to vote on the matter and have not received specific voting instructions from the beneficial owner of such shares. Encana and Newfield do not expect any broker non-votes at the Encana special meeting or Newfield special meeting because the rules applicable to banks, brokers and other nominees only provide brokers with discretionary authority to vote on proposals that are considered routine, whereas each of the proposals to be presented at the Encana special meeting and

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Newfield special meeting are considered non-routine. As a result, no broker will be permitted to vote your Encana common shares at the Encana special meeting or your shares of Newfield common stock at the Newfield special meeting without receiving instructions. Failure to instruct your broker on how to vote your shares will have no effect on the outcome of the share issuance proposal or the non-binding compensation advisory proposal, but will have the same effect as a vote “against” the approval of the merger agreement proposal.

Additional information on voting procedures can be found under the section entitled “Encana Special Meeting” and under the section entitled “Newfield Special Meeting.”

If you do not timely return a direction card, the trustee and/or plan administrator will vote your Encana common shares in accordance with their normal process. If you return a direction card with no instructions, the trustee and/or plan administrator will vote your Encana common shares “FOR” the share issuance proposal and “FOR” the Encana adjournment proposal. Please note that the direction cards have an earlier return date than the proxy cards. Please review your direction card for the date by which your instructions must be received in order for your Encana common shares to be voted.

In the case of Internet or telephone voting, you should have your direction card in hand and retain the card until you have completed the voting process. If you vote by Internet or telephone, you do not need to return the direction card by mail.

Please note that no votes will be accepted at the Encana special meeting in respect of Encana common shares held in an Encana employee benefit plan and that all such votes must be voted prior to the Encana special meeting.

If you do not timely return a direction card or if you return a direction card with no instructions, the trustee will vote your shares of Newfield common stock in proportion to the voting directions received from all plan participants who properly vote. Please note that the direction cards have an earlier return date than the proxy cards. Please review your direction card for the date by which your instructions must be received in order for your shares of Newfield common stock to be voted.

In the case of Internet or telephone voting, you should have your direction card in hand and retain the card until you have completed the voting process. If you vote by Internet or telephone, you do not need to return the direction card by mail.

Please note that no votes will be accepted at the Newfield special meeting in respect of shares of Newfield common stock held in Newfield’s 401(k) plan and that all such votes must be voted prior to the Newfield special meeting.

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Beneficial owners of Encana common shares may change their voting instruction by submitting new voting instructions to the brokers, banks or other nominees that hold their shares of record or by requesting a proxy issued in their own name from such broker, bank or other nominee and voting in person at the Encana special meeting. In addition, shareholders who hold Encana common shares in an Encana employee benefit plan may revoke or change their proxy via any of the foregoing methods, except that a new employee benefit plan participant proxy must be received by 8:00 a.m., Mountain Time, on February 4, 2019.

Additional information can be found under the section entitled “Encana Special Meeting.”

Beneficial owners of Newfield common stock may change their voting instruction by submitting new voting instructions to the brokers, banks or other nominees that hold their shares of record or by requesting a “legal proxy” from such broker, bank or other nominee and voting in person at the Newfield special meeting. In addition, stockholders who hold shares of Newfield common stock in Newfield’s 401(k) plan may revoke or change their proxy via any of the foregoing methods, except that a new 401(k) plan participant proxy must be received by 11:59 p.m., Eastern Time, on February 8, 2019.

Additional information can be found under the section entitled “Newfield Special Meeting.”

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For more information and quantification of these interests, please see “The Merger—Interests of Certain Newfield Directors and Executive Officers in the Merger.”

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Newfield stockholders may vote against the merger agreement proposal if they do not favor the merger. However, if the merger agreement proposal is approved, because shares of Newfield common stock are listed on the NYSE and Newfield stockholders are not required to receive consideration other than Encana common shares, which are also listed on the NYSE, with cash paid in lieu of the issuance of fractional Encana common shares, if any, in the merger, Newfield stockholders are not entitled to exercise dissenters’ or appraisal rights under Delaware law in connection with the merger.

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CAUTIONARY NOTE REGARDING OIL AND GAS RESERVE ESTIMATES

All reserves information presented herein was prepared in accordance with applicable SEC regulations. The SEC regulations applicable to reserve reporting differ from the evaluation and reporting requirements prescribed by applicable Canadian securities laws under National Instrument 51-101—Standards of Disclosure for Oil and Gas Activities (“NI 51-101”) and the forms related thereto. Differences in the estimates of the reserve volumes and values between SEC requirements and NI 51-101 methodology may be material. Accordingly, information contained in this joint proxy statement/prospectus and the documents incorporated by reference herein containing operating and oil and gas reserve data may not be comparable to similar information disclosed in accordance with NI 51-101.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

Information both included and incorporated by reference in this joint proxy statement/prospectus may contain certain forward-looking statements or information (collectively, “forward-looking statements”) within the meaning of Section 27A of the Securities Act, Section 21E of the Exchange Act, and the United States Private Securities Litigation Reform Act of 1995, as amended. All statements, other than statements of historical fact, included in this joint proxy statement/prospectus that address activities, events or developments that Encana or Newfield expects, believes or anticipates will or may occur in the future are forward-looking statements. Words such as “estimate,” “project,” “predict,” “believe,” “expect,” “anticipate,” “potential,” “create,” “intend,” “could,” “may,” “foresee,” “plan,” “will,” “guidance,” “look,” “outlook,” “future,” “assume,” “forecast,” “focus,” “continue” or the negative of such terms or other variations thereof and words and terms of similar substance used in connection with any discussion of future plans, actions, or events identify forward-looking statements. Forward-looking statements also include statements relating to: the timing of closing of the merger; the expectation that the closing conditions to the merger, including Encana shareholder and Newfield stockholder approvals and regulatory approvals, will be satisfied; the anticipated benefits from the merger; anticipated production and commodity mix of Encana, Newfield and the combined company; the anticipated synergies of the merger; the expectation that the transaction is accretive to all metrics in Encana’s five year plan; composition of the core assets of Encana, Newfield and the combined company, including allocation of capital and focus of development plans; growth in long-term shareholder value; vision of being a leading North American resource play company; statements with respect to strategic objectives of Encana, Newfield and the combined company, including capital allocation strategy, focus of investment, growth of high margin liquids volumes, operating and capital efficiencies and ability to preserve balance sheet strength; ability to lower costs and improve efficiencies to achieve competitive advantage; ability to repeat and deploy successful practices across the combined company’s multi-basin portfolio; balancing the combined company’s commodity portfolio; anticipated commodity prices; success of and benefits from technology and innovation, including cube development approach and advanced completion designs; ability to optimize well and completion designs; future well inventory; anticipated drilling, number of drilling rigs and the success thereof; anticipated drilling costs and cycle times; anticipated proceeds and future benefits from various joint venture, partnership and other agreements; expected timing for construction of facilities and costs thereof; expansion of future midstream services; estimates of reserves and resources; expected production and product types; statements regarding anticipated cash flow, non-GAAP cash flow margin and leverage ratios; anticipated cash and cash equivalents; anticipated hedging and outcomes of risk management program, including exposure to certain commodity prices and foreign exchange, amount of hedged production, market access and physical sales locations; impact of changes in laws and regulations; compliance with environmental legislation and claims related to the purported causes and impact of climate change, and the costs therefrom; adequacy of provisions for abandonment and site reclamation costs; financial flexibility and discipline; ability to meet financial obligations, manage debt and financial ratios, finance growth and compliance with financial covenants; impact to the combined company as a result of changes to its credit rating; access to the credit facilities of Encana, Newfield and the combined company; planned annualized dividend and the declaration and payment of future dividends, if any; Encana’s normal course issuer bid program, including amounts and number of shares to be acquired, anticipated timeframe, method and location of purchases, and source of funding thereof; adequacy of provision for taxes and legal claims of Encana, Newfield

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and the combined company; projections and expectation of meeting the targets contained in Encana’s and Newfield’s corporate guidance and Encana’s five-year plan; ability to manage cost inflation and expected cost structures, including expected operating, transportation and processing and administrative expenses; competitiveness and pace of growth of the assets of Encana, Newfield and the combined company within North America and against its and their peers; outlook of oil and gas industry generally and impact of geopolitical environment; expected future interest expense; the commitments and obligations of Encana, Newfield and the combined company and anticipated payments thereunder; statements with respect to future ceiling test impairments; and the possible impact and timing of accounting pronouncements, rule changes and standards; and the timing of the closing of the sale of Encana’s San Juan assets and the expectation that closing conditions and regulatory approvals in respect thereof will be satisfied.

Readers are cautioned against unduly relying on forward-looking statements which, by their nature, involve numerous assumptions, risks and uncertainties that may cause such statements not to occur, or results to differ materially from those expressed or implied. These assumptions include: expectations regarding the proposed merger; future commodity prices and differentials; foreign exchange rates; ability to access credit facilities and shelf prospectuses; assumptions contained in Encana’s corporate guidance, five-year plan and as specified herein; data contained in key modeling statistics; availability of attractive hedges and enforceability of risk management program; effectiveness of the drive to productivity and efficiencies of Encana, Newfield and the combined company; results from innovations; expectation that counterparties will fulfill their obligations under the gathering, midstream and marketing agreements of Encana, Newfield and the combined company; access to transportation and processing facilities where Encana and Newfield operate and where the combined company will operate; assumed tax, royalty and regulatory regimes; and expectations and projections made in light of, and generally consistent with, the historical experience and perception of historical trends of Encana and Newfield, including with respect to the pace of technological development, benefits achieved and general industry expectations. Risks and uncertainties that may affect these outcomes include: uncertainties relating to the Encana’s ability to successfully integrate Newfield’s business and technologies; Encana’s ability to realize the anticipated benefits of the merger, including the possibility that the expected benefits from the merger will not be realized or will not be realized within the expected time period; the ability to obtain required Encana shareholder and Newfield stockholder approvals and regulatory approvals for the merger; timing of such approvals and risk that regulatory approvals may result in the imposition of conditions that could adversely affect the expected benefits of the merger; the risk that the conditions to the merger are not satisfied on a timely basis or at all and/or the failure of the merger to close for any other reason; the risks relating to the value of the Encana common shares to be issued in connection with the merger; the disruption to Encana’s and Newfield’s respective businesses that could result from the announcement of the merger; Encana’s ability to implement Encana’s plans, forecasts and other expectations with respect to Newfield’s business after the completion of the merger and to realize expected synergies; disruption from the merger making it more difficult to maintain business and operational relationships; the amount of the costs, fees, expenses and charges related to the merger; unknown liabilities; the risk of litigation or regulatory actions related to the merger; the occurrence of any event, change or other circumstances that could give rise to the termination of the merger agreement; the ability of Encana, Newfield and the combined company to successfully integrate acquired businesses and technologies; ability to generate sufficient cash flow to meet obligations; commodity and commodity futures price volatility; sustained declines in commodity prices resulting in impairment of assets; actions of the Organization of the Petroleum Exporting Countries (OPEC), its members and other state-controlled oil companies relating to oil price and production controls; ability to secure adequate transportation and potential pipeline curtailments; variability and discretion of the Encana board and the Newfield board to declare and pay dividends, if any; timing and costs of well, facilities and pipeline construction; land, legal, regulatory and ownership complexities inherent in Canada, the U.S. and China; business interruption, property and casualty losses or unexpected technical difficulties, including impact of weather; counterparty and credit risk; impact of a downgrade in a credit rating, and its impact on access to sources of liquidity; fluctuations in currency and interest rates; risks associated with inflation rates; risks inherent in the corporate guidance of Encana, Newfield and the combined company; failure to achieve cost and efficiency initiatives; risks inherent in marketing operations; risks associated with drilling; risks associated with technology, including electronic, cyber or physical security breaches; changes in or interpretation of royalty,

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tax, environmental, greenhouse gas, carbon, accounting and other laws or regulations, including potential environmental liabilities that are not covered by an effective indemnity or insurance; risks associated with existing and potential lawsuits and regulatory actions made against Encana, Newfield, the combined company or the merger; impact of disputes arising with its partners, including suspension of certain obligations and inability to dispose of assets or interests in certain arrangements; the ability of Encana, Newfield and the combined company to acquire or find additional reserves; imprecision of reserves estimates and estimates of recoverable quantities, including future net revenue estimates; risks associated with past and future acquisitions or divestitures of certain assets or other transactions or receipt of amounts contemplated under the merger agreements (such transactions may include third-party capital investments, farm-outs or partnerships, which Encana or Newfield may refer to from time to time as “partnerships” or “joint ventures” and the funds received in respect thereof which Encana or Newfield may refer to from time to time as “proceeds,” “deferred purchase price” and/or “carry capital,” regardless of the legal form) as a result of various conditions not being met; and other risks described in this joint proxy statement/prospectus under the heading “Risk Factors,” in Item 1A Risk Factors of Encana’s Annual Report for the fiscal year ended December 31, 2017 on Form 10-K incorporated by reference in this joint proxy statement/prospectus, Item 1A Risk Factors of Encana’s Quarterly Report for the quarterly period ended September 30, 2018 on Form 10-Q incorporated by reference in this joint proxy statement/prospectus, risks and uncertainties impacting Encana’s business as described from time to time in Encana’s other periodic filings as filed on SEDAR and EDGAR, Item 1A Risk Factors of Newfield’s Annual Report for the fiscal year ended December 31, 2017 on Form 10-K incorporated by reference in this joint proxy statement/prospectus and risks and uncertainties impacting Newfield’s business as described from time to time in Newfield’s other periodic filings as filed on EDGAR.

Although Encana and Newfield believe the expectations represented by such forward-looking statements are reasonable, there can be no assurance that such expectations will prove to be correct. Readers are cautioned that the assumptions, risks and uncertainties referenced above and in the documents incorporated by reference herein are not exhaustive. Forward-looking statements are made as of the date of this joint proxy statement/prospectus (or, in the case of a document incorporated by reference, the date of such document incorporated by reference) and, except as required by law, neither Encana nor Newfield undertakes any obligation to update publicly or revise any forward-looking statements whether as a result of changes in internal estimates or expectations, new information, subsequent events or circumstances or otherwise. The forward-looking statements contained or incorporated by reference in this joint proxy statement/prospectus are expressly qualified by these cautionary statements.

The reader should read carefully the risk factors described in this joint proxy statement/prospectus and in the documents incorporated by reference in document for a description of certain risks that could, among other things, cause actual results to differ from these forward-looking statements.

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RISK FACTORS

In addition to the other information included and incorporated by reference into this joint proxy statement/prospectus, including the matters addressed in the section entitled “Cautionary Statement Regarding Forward-Looking Statements,” you should carefully consider the following risk factors before deciding whether to vote for the merger agreement proposal, in the case of Newfield stockholders, or for the share issuance proposal, in the case of Encana shareholders. In addition, you should read and consider the risks associated with each of the businesses of Newfield and Encana because these risks will relate to the combined company following the completion of the merger. Descriptions of some of these risks can be found in the Annual Reports of Encana and Newfield on Form 10-K for the fiscal year ended December 31, 2017, and any amendments thereto for each of Encana and Newfield, as such risks may be updated or supplemented in each company’s subsequently filed Quarterly Reports on Form 10-Q or Current Reports on Form 8-K, which are incorporated by reference into this joint proxy statement/prospectus. You should also consider the other information in this joint proxy statement/prospectus and the other documents incorporated by reference into this joint proxy statement/prospectus. See the section entitled “Where You Can Find More Information.”

Risks Relating to the Merger

Because the exchange ratio is fixed and the market prices of Encana common shares and Newfield common stock may fluctuate, Newfield stockholders cannot be sure of the value of the Encana common shares they will receive on the closing date.

At the effective time, each share of Newfield common stock (other than excluded shares) will be cancelled and converted into the right to receive 2.6719 Encana common shares with cash paid in lieu of the issuance of fractional Encana common shares, if any. If applicable, the exchange ratio will be adjusted appropriately to fully reflect the effect of any stock dividend, subdivision, stock split, reclassification, reorganization or other similar change with respect to the shares of either Encana common shares or Newfield common stock prior to the completion of the merger. The exchange ratio will not, however, be adjusted for changes in the market price of either Encana common shares or Newfield common stock between the date of signing the merger agreement and the effective time. Accordingly, at the time of the Encana special meeting and at the time of the Newfield special meeting, neither Encana shareholders nor Newfield stockholders will know, or be able to determine, the value of Encana common shares to be issued in connection with the merger. For that reason, the market price of Encana common shares on the date of the Encana special meeting and the Newfield special meeting may not be indicative of the value of Encana common shares that Newfield stockholders will receive upon completion of the merger.

The market prices of Encana common shares and Newfield common stock are subject to general price fluctuations in the market for publicly traded equity securities and have experienced volatility in the past. Neither Encana nor Newfield is permitted to terminate the merger agreement or re-solicit the vote of Encana shareholders or Newfield stockholders, as applicable, solely because of changes in the market prices of either Newfield’s common stock or Encana’s common shares. Share price changes may result from a variety of factors, including general market and economic conditions and changes in the respective businesses, operations and prospects, and regulatory considerations of Encana and Newfield. Market assessments of the benefits of the proposed merger and the likelihood that the transactions will be completed, as well as general and industry-specific market and economic conditions, may also affect market prices of Encana common shares and Newfield common stock. Many of these factors are beyond Encana’s and Newfield’s control. Newfield stockholders should obtain current market quotations for Encana common shares and for shares of Newfield common stock.

The market value of Encana common shares could be negatively affected by risks and conditions that apply to Encana, which may be different from the risks and conditions applicable to Newfield, and Encana shareholders will have different rights than Newfield stockholders.

Following the merger, Encana shareholders and former Newfield stockholders will own interests in a combined company operating an expanded business with more assets and a different mix of liabilities, in various

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jurisdictions in which Encana does not currently operate. The business of Encana and its subsidiaries and other companies it may acquire in the future are different from those of Newfield. There is a risk that various factors, conditions and developments that would not affect the price of Newfield common stock could negatively affect the price of Encana common shares. Current Encana shareholders and Newfield stockholders may not wish to continue to invest in the combined company, or may wish to reduce their investment in the combined company, including in order to comply with institutional investing guidelines, to increase diversification, to track any rebalancing of stock indices in which Encana common shares are included or not included, to respond to the risk profile of the combined company or to realize a gain. In addition, if, following the merger, large amounts of Encana common shares are sold, the price of Encana common shares could decline.

Encana shareholders will have rights that differ from the rights they had as Newfield stockholders before the merger. For a detailed comparison of the rights of Encana shareholders to the rights of Newfield stockholders, see “Comparison of Rights of Encana Shareholders and Newfield Stockholders.”

The merger is subject to conditions, including certain conditions that may not be satisfied, or completed on a timely basis, if at all. Failure to complete the merger could have material and adverse effects on Encana and Newfield.

Completion of the merger is subject to a number of conditions, including, among other things, (i) the receipt of certain approvals of Encana shareholders and Newfield stockholders, (ii) the expiration or termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, (iii) the effectiveness of the registration statement on Form S-4 that Encana is obligated to file with the SEC in connection with the issuance of Encana common shares in the merger, (iv) the authorization for listing of the Encana common shares to be issued in the merger on the NYSE and the TSX, (v) the accuracy of each party’s representations and warranties (subject to certain materiality qualifiers) and compliance by each party with its covenants under the merger agreement in all material respects and (vi) the absence of legal restraints prohibiting or restraining the merger. Such conditions make the completion and timing of the completion of the merger uncertain. Also, either Encana or Newfield may terminate the merger agreement if the merger has not been consummated by the outside date, except that this right to terminate the merger agreement will not be available to any party whose material breach of any provision of the merger agreement resulted in the failure of the merger to be consummated on or before that date. See the section entitled “The Merger Agreement—Conditions to Completion of the Merger” for a more detailed discussion.

If the merger is not completed, Encana’s and Newfield’s respective ongoing businesses may be adversely affected and, without realizing any of the benefits of having completed the merger, Encana and Newfield will be subject to a number of risks, including the following:

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The merger agreement contains provisions that limit Newfield’s and Encana’s ability to pursue alternatives to the merger, could discourage a potential competing acquiror of Encana or Newfield from making a favorable alternative transaction proposal and, in specified circumstances, Newfield may be required to pay Encana a termination fee of $150 million, or Encana may be required to pay Newfield a termination fee of $300 million.

The merger agreement contains certain provisions that restrict Newfield’s and Encana’s ability to solicit, initiate or knowingly encourage or facilitate, among other things, any inquiries, proposals, offers, or requests for information regarding, or the making of a competing proposal, engage in any discussions or negotiations with respect to a competing proposal or furnish any non-public information to any person in connection with a competing proposal. Further, even if the Newfield board or the Encana board changes its recommendation with respect to the merger agreement proposal or the share issuance proposal, as applicable, unless the merger agreement has been terminated in accordance with its terms, both parties will still be required to submit the merger agreement proposal and the share issuance proposal, as applicable, to a vote at its special meeting. In addition, the other party generally has an opportunity to offer to modify the terms of the merger in response to any third-party alternative transaction proposal before a party’s board of directors may change its recommendation with respect to the merger agreement proposal or the share issuance proposal, as applicable. In some circumstances, upon termination of the merger agreement, Newfield may be required to pay Encana a termination fee of $150 million, or Encana may be required to pay Newfield a termination fee of $300 million. In other circumstances, upon termination of the merger agreement, either Encana or Newfield could be required to pay the other party $50 million for costs, fees and expenses incurred by such other party. See the sections entitled “The Merger Agreement—No Solicitation of Alternative Proposals,” “The Merger Agreement—Termination of the Merger Agreement” and “The Merger Agreement—Expenses and Termination Fees Relating to the Termination of the Merger Agreement.”

These provisions could discourage a potential third-party acquirer or merger partner that might have an interest in acquiring all or a significant portion of Newfield or Encana in pursuing an alternative transaction with either from considering or proposing such a transaction, even if, in the case of an acquisition of Newfield, it were prepared to pay consideration with a higher per share price than the per share price proposed to be received in the merger or might result in a potential third-party acquiror or merger partner proposing to pay a lower price to the stockholders of Newfield or the shareholders of Encana than it might otherwise have proposed to pay because of the added expense of the termination fee that may become payable in certain circumstances.

Newfield’s executive officers and directors have interests in the merger that may be different from, or in addition to, the interests of Newfield stockholders generally.

When considering the recommendation of the Newfield board with respect to the merger, you should be aware that Newfield’s executive officers and directors may have interests in the merger that are different from, or in addition to, those of Newfield stockholders more generally. The Newfield board was aware of these interests during its deliberations on the merits of the merger and in deciding to recommend that Newfield stockholders vote for the approval of the merger agreement proposal at the Newfield special meeting.

These interests include, among others, the treatment of outstanding time-based restricted stock units and performance-based restricted stock units. Upon completion of the merger, each outstanding restricted stock award, time-based restricted stock unit award, performance-based restricted stock unit award and share of notional stock in respect of Newfield common stock will be treated as described in “The Merger—Treatment of Newfield Equity Awards in the Merger” beginning on page 134.

See the section of this joint proxy statement/prospectus entitled “The Merger—Interests of Certain Newfield Directors and Executive Officers in the Merger” for a more detailed description of the interests of Newfield’s executive officers and directors.

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Newfield and Encana will be subject to business uncertainties while the merger is pending, which could adversely affect their businesses.

In connection with the pendency of the merger, it is possible that certain persons with whom Newfield and Encana have a business relationship may delay or defer certain business decisions or might decide to seek to terminate, change or renegotiate their relationships with Newfield or Encana, as the case may be, as a result of the merger, which could negatively affect Newfield’s or Encana’s revenues, earnings and cash flows, as well as the market price of Newfield’s common stock or Encana’s common shares, regardless of whether the merger is completed.

Under the terms of the merger agreement, each of Newfield and Encana are subject to certain restrictions on the conduct of its business prior to the completion of the merger, which may adversely affect its ability to execute certain of its business strategies, including the ability in certain cases to enter into certain contracts, acquire or dispose of certain assets, or incur certain indebtedness or incur certain capital expenditures, as applicable. Such limitations could negatively affect Newfield’s and Encana’s businesses and operations prior to the completion of the merger.

The merger is subject to the receipt of approvals, consents or clearances from regulatory authorities that may impose conditions that could have an adverse effect on Encana or Newfield or, if not obtained, could prevent completion of the merger.

Completion of the merger is conditioned upon the receipt of certain governmental approvals. Although each party has agreed to use their respective best efforts to obtain the requisite governmental approvals, there can be no assurance that these approvals will be obtained and that the other conditions to completing the merger will be satisfied. In addition, the governmental authorities from which the regulatory approvals are required may impose conditions on the completion of the merger or require changes to the terms of the merger or other agreements to be entered into in connection with the merger agreement. Such conditions or changes and the process of obtaining regulatory approvals could have the effect of delaying or impeding consummation of the transaction or of imposing additional costs or limitations on Encana or Newfield following completion of the merger, any of which might have an adverse effect on Encana or Newfield following completion of the merger. For additional information about the regulatory approvals process, see “The Merger—Regulatory Approvals Required to Complete the Merger.”

The unaudited pro forma condensed combined financial statements in this joint proxy statement/prospectus are presented for illustrative purposes only and may not be reflective of the operating results and financial condition of Encana following the occurrence of the pro forma events.

The unaudited pro forma condensed combined financial statements in this joint proxy statement/prospectus are presented for illustrative purposes only, has been prepared based on available information and certain assumptions and estimates that Encana and Newfield believe are reasonable and is not necessarily indicative of what Encana’s actual financial position or results of operations would have been had the pro forma events been completed on the dates indicated. Further, Encana’s actual results and financial position after the pro forma events occur may differ materially and adversely from the unaudited pro forma condensed combined financial statements that are included in this joint proxy statement/prospectus. The unaudited pro forma condensed combined financial statements have been prepared with the assumption that Encana will be identified as the acquirer under GAAP and reflects adjustments based upon preliminary estimates of the fair value of assets to be acquired and liabilities to be assumed.

Current Encana shareholders and current Newfield stockholders will have a reduced ownership interest in the combined company.

In connection with the completion of the merger and the transactions contemplated by the merger agreement, based on the number of issued and outstanding shares of Newfield common stock as of October 29,

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2018 and the number of outstanding Newfield equity awards currently estimated to be payable in Encana common shares in connection with the merger, Encana anticipates issuing up to approximately 547.5 million common shares. The actual number of Encana common shares to be issued in the merger will be determined at the completion of the merger based on the number of shares of Newfield common stock outstanding at the time of the consummation of the merger. The issuance of these new shares could have the effect of depressing the market price of Encana’s common shares, through dilution of earnings per share or otherwise. Any dilution of, or delay of any accretion to, Encana’s earnings per share could cause the price of its common shares to decline or increase at a reduced rate.

Immediately after the merger is completed, it is expected that current Encana shareholders will own approximately 63.5% and current Newfield stockholders will own approximately 36.5% of the combined company’s common shares outstanding, respectively. As a result, current Encana shareholders and current Newfield stockholders will own a smaller percentage of the combined company than they currently own of Encana and Newfield, respectively, and will have less influence on the policies of the combined company than they currently have on the policies of Encana and Newfield, respectively.

Completion of the merger may trigger change in control or other provisions in certain agreements to which Newfield is a party.

The completion of the merger may trigger change in control or other provisions in certain agreements to which Newfield is a party. If Encana and Newfield are unable to negotiate waivers of those provisions, the counterparties may exercise their rights and remedies under the agreements, potentially terminating the agreements or seeking monetary damages or, in certain situations, Encana may be required to make an offer to purchase outstanding debt securities of Newfield. Even if Encana and Newfield are able to negotiate waivers, the counterparties may require a fee for such waivers or seek to renegotiate the agreements on terms less favorable to Newfield.

Risks Relating to Encana after Completion of the Merger

Following the merger, the market price of Encana common shares may be volatile, and Encana shareholders could lose a significant portion of their investment due to drops in the market price of Encana common shares following completion of the merger.

The market price of Encana common shares may be volatile, and following completion of the merger, shareholders may not be able to resell Encana common shares at or above the price at which they acquired such shares pursuant to the merger agreement or otherwise due to fluctuations in its market price, including changes in price caused by factors unrelated to Encana’s performance or prospects.

Specific factors that may have a significant effect on the market price for Encana common shares include, among others, the following:

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If the merger is completed, Encana may not achieve the intended benefits and the merger may disrupt its current plans or operations.

There can be no assurance that Encana will be able to successfully integrate Newfield’s assets or otherwise realize the expected benefits of the merger. Difficulties in integrating Newfield into Encana may result in the combined company performing differently than expected, in operational challenges or in the failure to realize anticipated synergies and efficiencies. Potential difficulties that may be encountered in the integration process include, among other factors: the inability to successfully integrate the businesses of Newfield into Encana in a manner that permits Encana to achieve the full revenue and cost savings anticipated from the merger; complexities associated with managing a larger, more complex, integrated business; not realizing anticipated operating synergies; integrating personnel from the two companies and the loss of key employees; potential unknown liabilities and unforeseen expenses, delays or regulatory conditions associated with and following completion of the merger; integrating relationships with vendors and business partners; performance shortfalls at one or both of the companies as a result of the diversion of management’s attention caused by completing the merger and planning to integrate Newfield’s operations into Encana; and the disruption of, or the loss of momentum in, each company’s ongoing business or inconsistencies between the companies’ standards, controls, procedures and policies.

Adverse changes in Encana’s credit rating may affect Encana’s borrowing capacity and borrowing terms.

Encana’s outstanding debt is periodically rated by nationally recognized credit rating agencies. The credit ratings are based upon Encana’s operating performance, liquidity and leverage ratios, overall financial position, and other factors viewed by the credit rating agencies as relevant to both Encana’s industry and the economic outlook. Encana’s credit rating may affect the amount of capital Encana can access, as well as the terms of any financing Encana obtains. Because Encana relies in part on debt financing to fund growth, adverse changes in Encana’s credit rating may have a negative effect on Encana’s future growth.

After the merger is completed, Newfield stockholders will become shareholders of a Canadian corporation and have their rights as shareholders governed by Encana’s organizational documents and Canadian law.

Upon consummation of the merger, Newfield stockholders will receive Encana common shares that will be governed by Encana’s organizational documents and the CBCA. For a detailed discussion of the differences between rights as an Encana shareholder and rights as a Newfield stockholder, see “Comparison of Rights of Encana Shareholders and Newfield Stockholders.”

Encana and Newfield are expected to incur significant transaction and acquisition-related costs in connection with the merger.

Encana and Newfield have incurred and are expected to continue to incur a number of non-recurring costs associated with negotiating and completing the merger, combining the operations of the two companies and achieving desired synergies. These costs may be substantial and, in many cases, will be borne by Encana and Newfield whether or not the merger is completed. A substantial majority of non-recurring expenses will consist of transaction costs and include, among others, fees paid to financial, legal and other advisors, employee retention, severance and benefit costs and filing fees. Encana will also incur costs related to formulating and implementing integration plans, including facilities and systems consolidation costs and other employment-related costs. Encana and Newfield continue to assess the magnitude of these costs, and additional unanticipated

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costs may be incurred in connection with the integration of the two companies’ businesses. The elimination of duplicative costs, as well as the realization of other efficiencies related to the integration of the businesses, may not initially offset integration-related costs or achieve a net benefit in the near term, or at all. Any unanticipated costs and expenses could have an adverse effect on Encana’s financial condition and operating results following the completion of the merger.

While Encana and Newfield have assumed that a certain level of expenses would be incurred, there are many factors beyond their control that could affect the total amount or the timing of the expenses.

Other Risk Factors of Encana and Newfield

Encana’s and Newfield’s businesses are and will be subject to the risks described above. In addition, Encana and Newfield are, and will continue to be subject to the risks described in Encana’s and Newfield’s Annual Reports on Form 10-K for the fiscal year ended December 31, 2017, as updated by subsequent Quarterly Reports on Form 10-Q and Current Reports on Form 8-K, all of which are filed with the SEC and incorporated by reference into this joint proxy statement/prospectus. The risks described above and in those filings represent all known material risks with respect to Encana’s and Newfield’s businesses. See “Where You Can Find More Information” for the location of information incorporated by reference into this joint proxy statement/prospectus.

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INFORMATION ABOUT ENCANA

Encana Corporation

Encana is a leading North American energy producer that is focused on developing its multi-basin portfolio of oil, NGL and natural gas producing plays. Encana’s operations also include the marketing of oil, NGLs and natural gas. All of Encana’s reserves and production are located in North America.

Encana’s common shares are listed and posted for trading on the NYSE and the TSX under the symbol “ECA.” Encana is incorporated under the CBCA and was formed in 2002 through the business combination of two predecessor companies.

The principal executive offices of Encana are located at Suite 4400, 500 Centre Street S.E., Calgary, Alberta T2P 2S5, Canada and its telephone number is (403) 645-2000. Additional information about Encana and its subsidiaries is included in documents incorporated by reference into this joint proxy statement/prospectus. See “Where You Can Find More Information.”

Neapolitan Merger Corp.

Neapolitan Merger Corp., a Delaware corporation (referred to previously in this joint proxy statement/prospectus as Merger Sub), is a wholly-owned indirect subsidiary of Encana. Merger Sub is newly formed, and was organized for the purpose of consummating the merger. Merger Sub has engaged in no business activities to date and it has no material assets or liabilities of any kind, other than those incident to its formation and those incurred in connection with the merger. Merger Sub’s address is 370 17^th Street, Suite 1700, Denver, Colorado 80202.

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INFORMATION ABOUT NEWFIELD

Newfield is a Delaware corporation, incorporated in 1988 and publicly traded on the NYSE since 1993. Newfield has been a member of the S&P 500 Index since 2010. Newfield’s operations are onshore and focus primarily on large scale, liquids-rich resource plays in the Anadarko Basin of Oklahoma, the Williston Basin of North Dakota and the Uinta Basin of Utah. In addition, Newfield has oil assets offshore of China and gas assets in the Arkoma Basin of Oklahoma. Shares of Newfield common stock are listed for trading on the NYSE under the symbol “NFX.”

The principal executive offices of Newfield are located at 4 Waterway Square Place, Suite 100, The Woodlands, Texas 77380 and its telephone number is (281) 210-5100. Additional information about Newfield and its subsidiaries is included in documents incorporated by reference into this joint proxy statement/prospectus. See “Where You Can Find More Information.”

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ENCANA SPECIAL MEETING

General

This joint proxy statement/prospectus is being provided to Encana shareholders as part of a solicitation of proxies by the Encana board for use at the Encana special meeting and at any adjournments or postponements of such special meeting. This joint proxy statement/prospectus provides Encana shareholders with important information about the Encana special meeting and should be read carefully in its entirety.

Date, Time and Place of the Encana Special Meeting

The Encana special meeting will be held on February 12, 2019 at the Oddfellows Building, Ballroom (Floor 4), 100 – 6th Avenue S.W., Calgary, Alberta, at 8:00 a.m., Mountain Time.

Purposes of the Encana Special Meeting

The Encana special meeting is being held to consider and vote on the following proposals: