| 1 | GSI | Government of the Republic of Slovenia | Callsign: Slovenia, | SLO | AVCODES |
| 2 | GSIC | GATOR SERVICES INC | | | SCAC4 |
| 3 | GSID | G&S INDUSTRIES, INC | | | SCAC1 |
| 4 | GSID | GENESIS & MANNY TRUCKING INC | | | SCAC4 |
| 5 | GSIF | G - SUKHMANI INC | | | SCAC4 |
| 6 | GSIG | GANESH SHIPPING INC | | | SCAC4 |
| 7 | GSIK | GOURMET SAVORIES INC | | | SCAC4 |
| 8 | GSIM | GARDEN STREET IRON & METAL INC | | | SCAC4 |
| 9 | GSIN | GREEN SKY INDUSTRIES INC | | | SCAC4 |
| 10 | GSIO | GOLDMAN & SALOUM INC | | | SCAC4 |
| 11 | GSIP | GM TRANSPORT | | | SCAC4 |
| 12 | GSIQ | GLOBE SHIPPING INC | | | SCAC4 |
| 13 | GSIR | GARMA SERVICE INC | | | SCAC4 |
| 14 | GSIS | GENESIS TRANSPORTATION CO INC | | | SCAC4 |
| 15 | GSIT | GAMAEL SHIPPING IMPORT & EXPORT | | | SCAC4 |
| 16 | GSIU | SPINELLI S.R.L | | I | BIC |
| 17 | GSIU | INDUSTRIE REBORA SRL | | | SCAC4 |
| 18 | GSIV | G S TRANSPORTATION | | | SCAC4 |
| 19 | GSIX | Semgroup LP | added 4/2005; 7/2005 | | NAKINA |
| 20 | GSIX | Williams Energy Ventures, Inc. | added 10/1999; 7/2000; eliminated 4/2005 | | NAKINA |
| 21 | GSIX | Gas Supply, Inc. | added 7/1977; 1/1980-1/1994; eliminated 10/1999 | | NAKINA |
| 22 | GSIX | Gas Service, Inc. | added 7/1969; 4/1970; eliminated 1/1975 | | NAKINA |
| 23 | GSIX | Godchaux Sugars, Inc. | 7/1937 (not listed) | | NAKINA |
| 24 | GSIX | Gustafson & Spencer, Inc. (C.A. Gustafson Co.) | 7/1923 | | NAKINA |
| 25 | GSIX | Gas Service, Inc. | added 7/69; 4/70; eliminated 1/75 | | NRHS |
| 26 | GSIX | Gas Supply, Inc. | added 7/77; 1/80-1/94; eliminated 10/99 | | NRHS |
| 27 | GSIX | Williams Energy Ventures, Inc. | added 10/99; 7/2000 | | NRHS |
| 28 | GSIX | *GUSTAFSON & SPENCER, INC. (C.A. GUSTAFSON CO.) | | | PWRC |
| 29 | GSIX | *GODCHAUX SUGARS, INC. | | | PWRC |
| 30 | GSIX | +SEMGROUP LP [GAS SUPPLY INC (WILLIAMS ENERGY VENTURES)] | | | PWRC |
| 31 | GSIX | Gas Supply (Williams Energy Ventures) | | | RSRV |
| 32 | GSIX | SEMGROUP LP | | | SCAC4 |
