| Abbreviation | Definition |
|---|---|
| SOQ | Special Opening Quotation |
| SOS | Stock Optimizing Selector |
| SOTP | Stock Option Transfer Program |
| SOX | Stockholm Bond Exchange |
| SPAC | Special Purpose Acquisition Company |
| SPAN | Standard Portfolio ANalysis of Risk |
| SPDA | Single Premium Deferred Annuity |
| SPDR | Standard & Poor's Depository Receipts |
| SPEED | Securities Position Easy Electronic Dissemination |
| SPI | Share Price Index |
| SPIF | State Pooled Investment Fund |
| SPO | Secondary Public Offering |
| SPOT | Single Payment Option Trading |
| SPP | Share Purchase Plan |
| SPP | Stock Purchase Plan |
| SPR | Spirit AeroSystems Holdings, Inc. |
| SPSE | St. Petersburg Stock Exchange |
| SQD | Sel Quoted Data |
| SQK | Steelcase, Inc. Options |
| SQO | Stock Quote |