| 1 | SPE | Sprague Electric Co. | Callsign: Sprague, | USA | AVCODES |
| 2 | SPE | Sprague Electric Company | | | ICAO1 |
| 3 | SPEA | SEAPEARL MARINE SA | | | SCAC4 |
| 4 | SPEB | SPADRA TRUCKING | | | SCAC4 |
| 5 | SPEBE | Spektra, spol. s r.o. | | CZ | VKM |
| 6 | SPEC | Spencerville and Elgin R.R. Co. | added 4/1978; added 10/1978 | | NAKINA |
| 7 | SPEC | Spencerville and Elgin R.R. Co. | added 4/78; added 10/78 | | NRHS |
| 8 | SPEC | *SPECTOR FREIGHT SYSTEM INC | | | PWRC |
| 9 | SPEC | *SPENCERVILLE & ELGIN RAILROAD | | | PWRC |
| 10 | SPEC | SPECIALIZED CARRIERS INC | | | SCAC4 |
| 11 | SPED | SPECIALIZED LOGISTICS SERVICE INC | | | SCAC4 |
| 12 | SPEE | SPEEDO FREIGHT SYSTEM, INC | | | SCAC4 |
| 13 | SPEED | Speed Sp. Z o.o. | | PL | VKM |
| 14 | SPEG | Spencerville and Elgin R.R. Co. | eliminated 7/1983 | | NAKINA |
| 15 | SPEG | Van Wert County-Allen County Port Authorities d/b/a Spencerville and Elgin R.R. Co. | added 7/1983; eliminated 10/1984 | | NAKINA |
| 16 | SPEG | Van Wert County Port Authority-Port Authority of Allen County d/b/a Spencerville and Elgin R.R. Co. | added 10/1984; eliminated 4/1985 | | NAKINA |
| 17 | SPEG | Spencerville and Elgin R.R. Co. | 1/1980; added 4/1985; eliminated 10/1991 | | NAKINA |
| 18 | SPEG | Van Wert County-Allen County Port Authorities d/b/a Spencerville and Elgin R.R. Co. | eliminated 10/84 | | NRHS |
| 19 | SPEG | Van Wert County Port Authority-Port Authority of Allen County d/b/a Spencerville and Elgin R.R. Co. | added 10/84; eliminated 4/85 | | NRHS |
| 20 | SPEG | Spencerville and Elgin R.R. Co. | 1/80; added 4/85; eliminated 10/91 | | NRHS |
| 21 | SPEG | *RETIRED 04-15-93 ATP (723) | | | PWRC |
| 22 | SPEG | *SPENCERVILLE & ELGIN RAILROAD | | | PWRC |
| 23 | SPEG | Spencerville and Elgin Railroad | | | RSRV |
| 24 | SPEH | SOUTHERN PERFORMANCE ENTERPRISES IN | | | SCAC4 |
| 25 | SPEJ | SAN ANTONIO GROUP INC | | | SCAC4 |
| 26 | SPEL | SPEEDSOURC | | | SCAC4 |
| 27 | SPEN | SPENCER, WILLIAM A JR TRUCKING INC | | | SCAC4 |
| 28 | SPENO | Speno International SA | | CH | TRAFFIC |
| 29 | SPENO | Speno International S.A. | | CH | VKM |
| 30 | SPEO | SPEED LOGISTICS LLC | | | SCAC4 |
| 31 | SPEP | SPEASE INC. | | | PWRC |
| 32 | SPEP | SPARKS EXPRESS INC | | | SCAC4 |
| 33 | SPEQ | SPEEDY PETROLEUM INC | | | SCAC4 |
| 34 | SPER | SUPERIOR TRANSPORTATION INC | | | SCAC4 |
| 35 | SPES | SPEEDY TRANSFER (MX-543897) | | | SCAC4 |
| 36 | SPET | SPECIAL TRANSPORTATION, INC. | | | PWRC |
| 37 | SPET | SPIDET TRANSPORT INC | | | SCAC4 |
| 38 | SPEU | CIMC CONTAINERS HOLDING COMPANY LTD | | PRC | BIC |
| 39 | SPEU | SPEEDIC EQUIPMENT SERVICES CORP | | | SCAC4 |
| 40 | SPEX | C.A. Spencer & Son Co. | 8/1920-7/1923 | | NAKINA |
| 41 | SPEX | Stork Brothers Refrigerator Line Co. | 7/1932 | | NAKINA |
| 42 | SPEX | Stork Brothers Refrigerator Line Co. (North Western Refrigerator Line Co.) | 7/1935 | | NAKINA |
| 43 | SPEX | Southern Pine Extracts Co. | 1/1952-10/1957; eliminated 7/1960 | | NAKINA |
| 44 | SPEX | Southern Pine Extracts Co. | 1/52-10/57; eliminated 7/60 | | NRHS |
| 45 | SPEX | *C. A. SPENCER & SON CO. | | | PWRC |
| 46 | SPEX | *STORK BROTHERS REFRIGERATOR LINE CO. | | | PWRC |
| 47 | SPEX | *SOUTHERN PINE EXTRACTS CO. | | | PWRC |
| 48 | SPEX | +SOUTHERN PARTS & EQUIPMENT INC. | | | PWRC |
| 49 | SPEX | SOUTHERN PARTS & EQUIPMENT INC | | | SCAC4 |
| 50 | SPEZ | SOUTH POINT ETHANOL CO. | | | PWRC |