| Abbreviation | Definition |
|---|---|
| RTST | Right Start, Incorporated (de-listed) |
| RTST | Right Start, Incorporated (de-listed) |
| RTTK | Reconversion Technology I |
| RTTK | Reconversion Technology Incorporated (de-listed) |
| RTTK | Reconversion Technology Incorporated (de-listed) |
| RTWI | R T W, Inc. |
| RTWI | RTW, Incorporated (de-listed) |
| RTWI | RTW, Incorporated (de-listed) |
| RUBM | Ruby Mining Company |
| RUBO | Rubio's Restaurants, Inc. |
| RUBO | Rubio's Restaurants, Incorporated (de-listed) |
| RUBO | Rubio's Restaurants, Incorporated (de-listed) |
| RUBRE | Rubber Reserch Elastromet |
| RUBRE | Rubber Reserch Elastromet (de-listed) |
| RUBRE | Rubber Reserch Elastromet (de-listed) |
| RUNI | Reunion Industries, Inc. |
| RURL | Rural/ Metro Corporation |
| RUSH | Rush Enterprises, Inc. |
| RUSM | Russell Metals, Inc. |
| RUSS | Whitney Information Networks |