| 501 | SARADAMONI ENGINEERING WORKS PRIVATE LIMITED - U32109WB1998PTC087936 |
| 502 | SARASWATI CELLPHONE PRIVATE LIMITED - U32204WB2010PTC147443 |
| 503 | SAROGI MEGA ELECTRICALS PRIVATE LIMITED - U32201WB2011PTC161583 |
| 504 | SATCOM ELEKTRONICS PVT.LTD. - U32109WB1995PTC071820 |
| 505 | SATISFACTION ELECTRONICS PVT LTD - U32109WB1984PTC037680 |
| 506 | SATYAJIT LTD - U32109WB1994PLC064366 |
| 507 | SATYAYUG FILMS PRIVATE LIMITED - U32304WB2012PTC184310 |
| 508 | SAVITRI HI-TECH PRIVATE LIMITED - U32109WB2003PTC096127 |
| 509 | SBAS ELECTRONICS CONTROL PVT LTD - U32109WB1989PTC046649 |
| 510 | SELDIRK INDIA PVT LTD - U32101WB1985PTC039676 |
| 511 | SELECT BHUNIRMAAN PRIVATE LIMITED - U32203WB1987PTC043334 |
| 512 | SEMAPHORE TECHNOLOGIES PRIVATE LIMITED - U32109WB2007PTC120385 |
| 513 | SEMICIRCUIT PVT. LTD. - U32102WB1989PTC047783 |
| 514 | SEMICON TELECOM PRIVATE LIMITED - U32301WB1999PTC089420 |
| 515 | SEN STAR HOME AND LIFE SOLUTION PRIVATE LIMITED - U32201WB2006PTC111592 |
| 516 | SGC NATURAL ENERGY PRIVATE LIMITED - U32204WB2011PTC170201 |
| 517 | SGS AUTOMATION SERVICES PRIVATE LIMITED - U32109WB1999PTC089372 |
| 518 | SHANKER INFRATEL PRIVATE LIMITED - U32204WB2009PTC138184 |
| 519 | SHEESHMAHAL ELECTRONICS PVT LTD - U32109WB1989PTC046590 |
| 520 | SHINEHORIZON HOME APPLIANCES PRIVATE LIMITED - U32204WB2012PTC186249 |
| 521 | SHIVA AUDIO VISUAL PVT LTD - U32304WB1996PTC080962 |
| 522 | SHOCKLEY HALL ELECTRONICS PVT LTD - U32109WB1985PTC039416 |
| 523 | SHREE IMPEX PRIVATE LIMITED - U32109WB1997PTC084129 |
| 524 | SHREE OM FERRO-ALLOY PRIVATE LIMITED - U32109WB1998PTC087561 |
| 525 | SHRI KRISHNA EYE FOUNDATION & MEDICAL CE NTRE PVT.LTD. - U32301WB1997PTC083520 |