X0306 4 2017-12-28 1 0000277595 ENERGEN CORP EGN 0001535472 Corvex Management LP 667 MADISON AVENUE NEW YORK NY 10065 0 0 1 0 0001307631 Meister Keith A. 667 MADISON AVENUE NEW YORK NY 10065 0 0 1 0 Common Stock 2017-12-28 4 S 0 40000 57.4626 A 9750768 I See Footnotes Common Stock 2017-12-29 4 S 0 40294 57.6619 A 9710474 I See Footnotes The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $57.21 to $57.69, inclusive. The reporting persons undertake to provide to Energen Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1) and (4) to this Form 4. Shares of common stock (the "Shares") of the Issuer held for the accounts of certain private investment funds for which Corvex Management LP ("Corvex") acts as investment adviser, including Corvex Master Fund LP and Corvex Select Equity Master Fund LP (collectively, the "Corvex Funds"). The general partner of Corvex is controlled by Keith Meister. For purposes of Section 16 of the Securities Exchange Act of 1934, each of Corvex and Mr. Meister disclaims beneficial ownership of the securities of the Issuer held directly by the Corvex Funds except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of Corvex or Mr. Meister is the beneficial owner of such securities for purposes of Section 16 or any other purpose. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $57.03 to $57.95, inclusive. CORVEX MANAGEMENT LP, Name: /s/ Keith Meister, Title: Managing Partner 2018-01-02 KEITH MEISTER, Name: /s/ Keith Meister 2018-01-02