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

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Item 5. Interest in Securities of the Issuer

(a)-(b) Corvex may be deemed to be the beneficial owner of 9,790,768 Shares, which collectively represent approximately 10.1% 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 9,790,768 Shares.

The percentage calculated in the immediately foregoing paragraph is calculated based on a total of 97,197,175 Shares
outstanding as of July 31, 2017, as reported in the Issuers Quarterly Report on Form 10-Q filed with the SEC on August 8, 2017.

On August 7, 2017, Corvex sold the previously disclosed listed American-style call options with an expiration date of October 20, 2017, referencing
an aggregate of 415,200 Shares at an exercise price of $50 per Share.

In addition, Corvex also has sold listed American-style call options referencing an
aggregate of 415,200 Shares with an exercise price of $60 per Share, which expire on October 20, 2017, and has sold listed American-style put options referencing an aggregate of 415,200 Shares with an exercise price of $40 per Share, which
expire on January 19, 2018.

(c) Except as set forth in Exhibit 8 attached hereto or previously disclosed in the Schedule 13D, as amended,
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 7. Material to be Filed as
Exhibits

Exhibit 8 Transactions in the Shares effected in the past 60 days