| Abbreviation | Definition |
|---|---|
| SDNIE | Scottsdale Technologies, Incorporated (de-listed) |
| SDNIE | Scottsdale Technologies, Incorporated (de-listed) |
| SDNZY | Sivensa Siderurgica Venez |
| SDOGP | San Diego Gas & Electric Company |
| SDOZY | Sandoz, LTD., Sponsored American Depositary Receipts |
| SDRC | Structural Dynamics Research |
| SDSIE | Standard Silver Corporation |
| SDSK | SoftDesk, Inc. |
| SDSK | SoftDesk, Incorporated (de-listed) |
| SDSK | SoftDesk, Incorporated (de-listed) |
| SDVRE | S D I Virtual Reality |
| SDWSF | SideWare Systems |
| SEAC | SeaChange International, Inc. |
| SEAGE | Sea Galley Stores, Inc. |
| SEAGE | Sea Galley Stores, Incorporated (de-listed) |
| SEAGE | Sea Galley Stores, Incorporated (de-listed) |
| SEAH | Seal Holdings Corporation |
| SEAH | Seal Holdings Corporation (de-listed) |
| SEAH | Seal Holdings Corporation (de-listed) |
| SEAI | Stanfield Educational Alternatives, Inc. |