| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13D/A | 2010-02-12 | ANADARKO PETROLEUM CORP | Western Gas Partners LP | 9,254,435 | 25.0% | EDGAR |
| SC 13G/A | 2010-02-11 | KAYNE ANDERSON CAPITAL ADVISORS LP | Western Gas Partners LP | - | 11.0% | EDGAR |
| SC 13D/A | 2009-07-24 | ANADARKO PETROLEUM CORP | Western Gas Partners LP | 8,633,746 | 29.3% | EDGAR |
| SC 13G/A | 2009-07-10 | Neuberger Berman Group LLC | Western Gas Partners LP | 3,000,828 | 10.3% | EDGAR |
| SC 13G | 2009-06-11 | Neuberger Berman Group LLC | Western Gas Partners LP | 2,588,253 | 8.9% | EDGAR |
| SC 13G | 2009-02-13 | NEUBERGER BERMAN INC | Western Gas Partners LP | 1,965,244 | 7.4% | EDGAR |
| SC 13G | 2009-02-12 | KAYNE ANDERSON CAPITAL ADVISORS LP | Western Gas Partners LP | - | 8.4% | EDGAR |
| SC 13D/A | 2008-12-24 | ANADARKO PETROLEUM CORP | Western Gas Partners LP | 8,282,322 | 28.5% | EDGAR |
| SC 13D/A | 2008-06-16 | ANADARKO PETROLEUM CORP | Western Gas Partners LP | 15,100 | 21.6% | EDGAR |
| SC 13D | 2008-05-23 | ANADARKO PETROLEUM CORP | Western Gas Partners LP | 15,100 | 21.0% | EDGAR |