| 281 | | SEAWAY | Product Distribution-Traiding | Russia | G | D6 |
| 282 | | Segment | Product Distribution-Traiding | Russia | G | C19 |
| 283 | | SegmentEnergo | Shipbuilding and Ship Repair-Shipyard, Shipbuilding and Ship Repair-Ship Repair, Shipbuilding and Ship Repair-Ship Equipment and Components | Russia | H | W9 |
| 284 | | Semikarakor fish | Aquaculture-Farming | Russia | G | C13 |
| 285 | | SEROGLAZKA TERMINAL | Logistics & Storage-Cargo Shipping | Russia | G | D2 |
| 286 | | SETREM | Aquaculture-Aquaculture Equipment | France | G | L9 |
| 287 | | SEVCO, TC | Catching and Processing-Processing, Product Distribution-Traiding, Product Distribution-Retail | Russia | G | C2 |
| 288 | | Severnaya verf, SP | Shipbuilding and Ship Repair-Shipyard, Shipbuilding and Ship Repair-Ship Repair | Russia | H | U5 |
| 289 | | Severnaya Zvezda, Belokamenka | Product Distribution-Traiding | Russia | G | C12 |
| 290 | | SFERA, PB | Other-Mass Media | Russia | G | M3 |
| 291 | | Sharin | Catching and Processing-Processing, Product Distribution-Traiding | Iran | G | B6 |
| 292 | | Shipbuilding & Shiprepair Technology Center (SSTC) | Shipbuilding and Ship Repair-Engineering Bureau, Other-Scientific Research Institutions | Russia | | |
| 293 | | Shipbuilding cluster of the Nizhny Novgorod region | Shipbuilding and Ship Repair-Ship Equipment and Components | Russia | H | V12 |
| 294 | | SIBBIORESURS | Aquaculture-Feeds and Additives | Russia | G | L14 |
| 295 | | SIGMA MARINE TECHNOLOGY | Catching and Processing-Catching, Catching and Processing-Processing | Russia | G | H2 |
| 296 | | SIRIUS | Product Distribution-Traiding | Russia | G | L3 |
| 297 | | Sitronics KT | Shipbuilding and Ship Repair-Ship Systems | Russia | X13 | H |
| 298 | | SIVETRA-AGRO | Aquaculture-Feeds and Additives, Aquaculture-Aquaculture Equipment | Russia | G | L12 |
| 299 | | Skolkovo Foundation | Other-State Institutions | Russia | G | L8 |
| 300 | | Slobodskaya sagva | Aquaculture-Farming | Russia | G | C13 |
