| SC 13G/A | 2016-02-11 | WELLINGTON MANAGEMENT GROUP LLP | ENERGEN CORP | 8,791,008 | 11.2% | EDGAR |
| SC 13G/A | 2016-02-10 | VANGUARD GROUP INC | ENERGEN CORP | 5,724,151 | 7.3% | EDGAR |
| SC 13G/A | 2016-02-09 | Boston Partners | ENERGEN CORP | 8,952,858 | 11.4% | EDGAR |
| SC 13G/A | 2016-01-26 | BlackRock Inc. | ENERGEN CORP | 6,882,130 | 8.7% | EDGAR |
| SC 13G/A | 2016-01-15 | JPMORGAN CHASE & CO | ENERGEN CORP | - | - | EDGAR |
| SC 13G/A | 2015-10-09 | JPMORGAN CHASE & CO | ENERGEN CORP | - | - | EDGAR |
| SC 13G/A | 2015-06-09 | Boston Partners | ENERGEN CORP | 7,324,876 | 10.0% | EDGAR |
| SC 13G/A | 2015-02-13 | FMR LLC | ENERGEN CORP | 1,312,380 | 1.8% | EDGAR |
| SC 13G/A | 2015-02-12 | WELLINGTON MANAGEMENT GROUP LLP | ENERGEN CORP | 8,276,329 | 11.3% | EDGAR |
| SC 13G | 2015-02-12 | STATE STREET CORP | ENERGEN CORP | - | 5.6% | EDGAR |
| SC 13G/A | 2015-02-11 | VANGUARD GROUP INC | ENERGEN CORP | 5,100,994 | 7.0% | EDGAR |
| SC 13G | 2015-02-10 | Boston Partners | ENERGEN CORP | 6,629,178 | 9.1% | EDGAR |
| SC 13G/A | 2015-01-29 | BlackRock Inc. | ENERGEN CORP | 4,978,588 | 6.8% | EDGAR |
| SC 13G | 2015-01-27 | JPMORGAN CHASE & CO | ENERGEN CORP | - | - | EDGAR |
| SC 13G | 2014-07-10 | WELLINGTON MANAGEMENT CO LLP | ENERGEN CORP | 7,471,565 | 10.3% | EDGAR |
| SC 13G | 2014-02-14 | FMR LLC | ENERGEN CORP | 4,024,946 | 5.5% | EDGAR |
| SC 13G/A | 2014-02-13 | SYSTEMATIC FINANCIAL MANAGEMENT LP | ENERGEN CORP | 177,583 | 0.2% | EDGAR |
| SC 13G/A | 2014-02-12 | VANGUARD GROUP INC | ENERGEN CORP | 4,531,377 | 6.2% | EDGAR |
| SC 13G | 2014-02-03 | STATE STREET CORP | ENERGEN CORP | - | 5.3% | EDGAR |
| SC 13G/A | 2014-01-29 | BlackRock Inc. | ENERGEN CORP | 4,906,532 | 6.8% | EDGAR |