| Name | Unified registration number |
|---|---|
| SIA "ZINZINO" | 40103529390 |
| SIA "Zirgu stallis Olimp" | 40203599731 |
| SIA "ZK 9" | 50103194261 |
| SIA "Zooserviss" | 40003513035 |
| SIA "ZOOSERVISS GROUP" | 40003307770 |
| Siemens Healthcare Oy Latvijas filiāle | 40103906527 |
| Siemens Osakeyhtiö | FI0113901-2 |
| Siemens Osakeyhtio Latvijas filiāle | 40103246186 |
| SIGNEDA LATVIA SIA | 40203020020 |
| SIG SOLAR LATVIA SIA | 50203468111 |
| SIRONA Dental Systems GmbH | DEHRB 24948 |
| Skaistas pagasta zemnieku saimniecība "SAPNIS" | 45901001222 |
| Skalnik Sp. z o.o. | PL0000344563 |
| SKANDINAVISKA ENSKILDA BANKEN AB Rīgas filiāle | 40003816496 |
| SK hynix NAND Product Solutions Netherlands | NL83337601 |
| Slēgtas akciju sabiedrības "NOTA BENE" filiāle "NOTA BENE-LATVIJA" | 40003344847 |
| "SL.NET" SIA | 50003664091 |
| Smartecon SIA | 40203393648 |
| SmartPosti SIA | 40003567822 |
| Solar Channel SIA | 40203393347 |