| SC 13G/A | 2012-02-14 | CREDIT AGRICOLE S A | SemGroup Corp | 2,029,157 | 4.9% | EDGAR |
| SC 13G/A | 2012-02-14 | Soroban Capital Partners LLC | SemGroup Corp | 3,250,000 | 7.8% | EDGAR |
| SC 13G/A | 2012-02-14 | OZ MANAGEMENT LP | SemGroup Corp | 0 | 0.0% | EDGAR |
| SC 13G | 2012-02-09 | BlackRock Inc. | SemGroup Corp | 2,089,274 | 5.0% | EDGAR |
| SC 13G | 2012-02-06 | Robeco Investment Management, Inc. | SemGroup Corp | 2,077,713 | 5.0% | EDGAR |
| SC 13G/A | 2012-02-01 | BNP PARIBAS | SemGroup Corp | 828,715 | 2.0% | EDGAR |
| SC 13D | 2012-01-17 | SemGroup Corp | Rose Rock Midstream, L.P. | 171,218 | 16.6% | EDGAR |
| SC 13G | 2012-01-13 | Senator Investment Group LP | SemGroup Corp | 2,200,000 | 5.3% | EDGAR |
| SC 13G | 2011-10-27 | Soroban Capital Partners LLC | SemGroup Corp | 2,408,500 | 5.8% | EDGAR |
| SC 13G | 2011-02-15 | OZ MANAGEMENT LP | SemGroup Corp | 2,858,152 | 7.0% | EDGAR |
| SC 13G | 2011-02-14 | BNP PARIBAS | SemGroup Corp | 4,678,818 | 11.4% | EDGAR |
| SC 13G | 2011-02-10 | CREDIT AGRICOLE S A | SemGroup Corp | 2,117,254 | 5.1% | EDGAR |