13D Filing: Corvex Capital and Energen Corporation (EGN)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No.     )*

ENERGEN
CORPORATION

(Name of Issuer)

COMMON STOCK, $0.01 PAR VALUE

(Title of Class of Securities)

29265N108

(CUSIP Number)

Keith Meister

Patrick J. Dooley, Esq.

Corvex Management LP

667
Madison Avenue

New York, NY 10065

(212) 474-6700

Jeffrey
L. Kochian

Akin Gump Strauss Hauer & Feld LLP

One Bryant Park

New
York, NY 10036

(212) 872-8069

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

May 22, 2017

(Date of
Event Which Requires Filing of this Statement)

If the filing person has
previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following
box.   ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for
other parties to whom copies are to be sent.

*	The remainder of this cover page shall be filled out for a reporting persons initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be
deemed to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act
(however, see the Notes).

---

CUSIP No. 29265N108

1.		Name of Reporting Person: CORVEX MANAGEMENT LP
2.		Check the Appropriate Box if a Member of a Group (See Instructions): (a)  ☐        (b)  ☒
3.		SEC Use Only:
4.		Source of Funds (See Instructions): AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e): ☐
6.		Citizenship or Place of Organization: DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With				7.		Sole Voting Power: 5,373,386*
				8.		Shared Voting Power: 0
				9.		Sole Dispositive Power: 5,373,386*
				10.		Shared Dispositive Power: 0
11.		Aggregate Amount Beneficially Owned by Each Reporting Person: 5,373,386*
12.		Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions): ☐
13.		Percent of Class Represented by Amount in Row (11): 5.5%*
14.		Type of Reporting Person (See Instructions): PN, IA

(*)	See Item 5.

---

CUSIP No. 29265N108

1.		Name of Reporting Person: KEITH MEISTER
2.		Check the Appropriate Box if a Member of a Group (See Instructions): (a)  ☐        (b)  ☒
3.		SEC Use Only:
4.		Source of Funds (See Instructions): AF
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e): ☐
6.		Citizenship or Place of Organization: United States
Number of Shares Beneficially Owned by Each Reporting Person With				7.		Sole Voting Power: 5,373,386*
				8.		Shared Voting Power: 0
				9.		Sole Dispositive Power: 5,373,386*
				10.		Shared Dispositive Power: 0
11.		Aggregate Amount Beneficially Owned by Each Reporting Person: 5,373,386*
12.		Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions): ☐
13.		Percent of Class Represented by Amount in Row (11): 5.5%*
14.		Type of Reporting Person (See Instructions): IN, HC

(*)	See Item 5.

---

Item 1. Security and Issuer

The title of the class of equity security to which this statement on Schedule 13D relates is the common stock, par value $0.01 per share (the
Shares), of Energen Corporation, an Alabama corporation (the Issuer). The address of the Issuers principal executive offices is 605 Richard Arrington Jr. Boulevard North, Birmingham, Alabama 35203.

The information set forth in response to each separate Item below shall be deemed to be a response to all Items where such information is relevant.

Item 2. Identity and Background

This statement on
Schedule 13D is filed on behalf of Corvex Management LP, a Delaware limited partnership (Corvex), and Keith Meister, a U.S. citizen (collectively, the Reporting Persons). This statement relates to Shares held for the
accounts of certain private investment funds for which Corvex acts as investment adviser, including Corvex Master Fund, LP and Corvex Select Equity Master Fund LP, each a Cayman Islands limited partnership, the general partner of each of which
is controlled by Mr. Meister (collectively, the Corvex Funds). The general partner of Corvex is controlled by Mr. Meister. The principal business address of each of Corvex and Mr. Meister is 667 Madison Avenue,
New York, NY 10065. The principal business of Corvex is serving as the investment adviser of private investment funds, whose principal business is investing in securities. Mr. Meisters principal occupation is serving as the
Managing Partner of Corvex. A joint filing agreement of Corvex and Mr. Meister is attached hereto as Exhibit 1.

During the last five
years, none of Corvex, Mr. Meister or any of the Corvex Funds has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or has been party to a civil proceeding of a judicial or administrative body of
competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any
violation with respect to such laws.

Item 3. Source and Amount of Funds or Other Consideration

The Reporting Persons used the working capital of the Corvex Funds to purchase the 1,429,822 Shares reported herein and to acquire the call options referenced
in Item 5. The total purchase price for the Shares reported herein was approximately $74,301,817 and the purchase price to acquire such call options was approximately $65,724,515.

Various of the Reporting Persons may effect purchases of securities through margin accounts maintained for the Corvex Funds with brokers, which extend margin
credit as and when required to open or carry positions in their margin accounts, subject to applicable federal margin regulations, stock exchange rules and such firms credit policies. Positions in Shares may be held in margin accounts and may
be pledged as collateral security for the repayment of debit balances in such accounts.

Item 4. Purpose of Transaction

The Reporting Persons acquired the Shares and options over which they exercise beneficial ownership in the belief that the Shares are undervalued and are an
attractive investment.

The Reporting Persons have had discussions with the Issuer to express the Reporting Persons views as to the Issuers
business and strategies to enhance or maximize shareholder value. In these discussions, the Reporting Persons have expressed the view that the Issuer has some of the most attractive leaseholds for oil and gas development in the Permian Basin.
However, despite this leading asset position, the Issuers operational performance has fallen short of its peer companies, leading to underperformance both in terms of financial results and shareholder returns. As a result, the Reporting
Persons believe the Issuer needs to strongly consider what actions can be taken to enhance and maximize shareholder value including a review of the potential value delivered to shareholders through a change of control transaction given
the recent wave of acquisitions in the Permian Basin at per acre values well in excess of the Issuers current implied value. The Reporting Persons and their representatives expect to continue to have conversations with the Issuer and with
third parties, including both domestic and international oil and gas companies, as well as shareholders of the Issuer and others.

---

The Reporting Persons intend to review their investment in the Issuer on a continuing basis and may from time to
time and at any time in the future depending on various factors, including, without limitation, the Issuers financial position and strategic direction, actions taken by the Issuers Board of Directors, price levels of the Shares, other
investment opportunities available to the Reporting Persons, conditions in the securities market and general economic and industry conditions, take such actions with respect to their investments in the Issuer as they deem appropriate. These actions
may include, without limitation: (i) acquiring additional Shares and/or other equity, debt, notes, other securities, or derivative or other instruments that are convertible into Shares, or are based upon or relate to the value of the Shares or the
Issuer (collectively, Securities) in the open market or otherwise; (ii) disposing of any or all of their Securities in the open market or otherwise; (iii) engaging in any hedging or similar transactions with respect to the Securities; or
(iv) proposing or considering one or more of the actions described in subsections (a) through (j) of Item 4 of Schedule 13D.

Item 5. Interest in
Securities of the Issuer

(a)-(b) Corvex may be deemed to be the beneficial owner of 1,429,822 Shares and 3,943,564 Shares underlying the call
options referenced below in this Item 5, which collectively represent approximately 5.5% of the Issuers outstanding Shares. By virtue of his position as control person of the general partner of Corvex, Mr. Meister may be considered
to beneficially own such Shares. The Reporting Persons may be deemed to have sole power to vote and sole power to dispose of 5,373,386 Shares.

The
percentage calculated in the immediately foregoing paragraph is calculated based on a total of 97,188,418 Shares outstanding as of May 1, 2017, as reported in the Issuers Quarterly Report on Form 10-Q filed with the SEC on May 9,
2017.

The call options referenced above are over-the-counter market American-style call options referencing an aggregate of 3,943,564 Shares, which have
an exercise price of $36.50 per Share and expire on May 31, 2018.

In connection with the above referenced call options, Corvex sold in the
over-the-counter market European-style put options referencing an aggregate of 3,943,564 Shares at an exercise price of $36.50 per Share, which expire on the earlier of May 31, 2018, or the date on which the corresponding American-style call
option described above in this Item 5 is exercised.

(c) Except as set forth in Exhibit 2 attached hereto, there have been no transactions in
the Shares during the sixty days prior to the date hereof by any of the Reporting Persons.

(d) The limited partners of (or investors in) each of the
private investment funds for which Corvex or its affiliates acts as general partner and/or investment adviser have the right to participate in the receipt of dividends from, or proceeds from the sale of, the Shares held for the accounts of their
respective funds in accordance with their respective limited partnership interests (or investment percentages) in their respective funds.

(e)	Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to
Securities of the Issuer

Except for the arrangements described herein, to the best knowledge of the Reporting Persons, there are no contracts,
arrangements, understandings or relationships (legal or otherwise) among the persons named in Item 2 and between such persons and any other person with respect to any securities of the Issuer, including but not limited to transfer or voting of
any of the securities, finders fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or loss, or the giving or withholding of proxies.

Item 7. Material to be Filed as Exhibits

Exhibit 1 Joint Filing Agreement

Exhibit 2 Transactions in the Shares effected in the past 60 days

---

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: May 31, 2017				CORVEX MANAGEMENT LP
				By:		/s/ Keith Meister
						Keith Meister
						Managing Partner
Date: May 31, 2017				KEITH MEISTER
				By:		/s/ Keith Meister
						Keith Meister