| 1 | MWHD | MAW'S WAREHOUSE&DELIVERY SERVICE, INC | | | SCAC1 |
| 2 | MWHI | MP WAREHOUSE INC | | | SCAC4 |
| 3 | MWHL | MADRIGAL-WAN HAI LINE | | | SCAC1 |
| 4 | MWHL | MADRIGAL - WAN HAI LINES CORP | | | SCAC4 |
| 5 | MWHO | MERCURY TRANSFER & WAREHOUSE | | | SCAC4 |
| 6 | MWHP | MIDWES | | | SCAC4 |
| 7 | MWHU | MITSUI WAREHOUSE CO., LTD*THE | | | SCAC4 |
| 8 | MWHX | Markwest Hydrocarbon Inc. | added 10/2008 | | NAKINA |
| 9 | MWHX | Markwest Hydrocarbon Partners, Ltd. | added 1/1993; 1/1994-7/2005; eliminated 10/2008 | | NAKINA |
| 10 | MWHX | Markwest Hydrocarbon Partners, Ltd. | added 1/93; 1/94-7/2000 | | NRHS |
| 11 | MWHX | MARKWEST HYDROCARBON PARTNERS, LTD. | | | PWRC |
| 12 | MWHX | Markwest Hydrocarbon Partners | | | RSRV |
| 13 | MWHX | MARKWES | | | SCAC4 |
| 14 | MWHZ | MERCHANDISE WAREHOUSE | | | PWRC |
