[ Company selection: All | A | B | C | D | E | F | G | H | I | J | K | L | M | N | P | Q | R | S | T | U | V | W | X | Y | Z ] |
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 | Company | IECQ Certificate Number | | Country / location | Issue date | Status | |
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| SAKAE TSUSHIN KOGYO CO., LTD. Mitsuke Factory | IECQ-P JQAJP 13.0004 | | Japan | 2018/07/31 | Current | |
| SAKAE TSUSHIN KOGYO CO., LTD. Agano Factory | IECQ-P JQAJP 13.0004-01 | | Japan | 2018/07/31 | Current | |
| SANMENXIA INSTRUMENT ELECTRONICS CO., LTD. | IECQ-P CEP 17.0005 | | China | 2018/09/20 | Current | |
| SANWA ELECTRONIC CIRCUIT CO., LTD. Mihara Facto... | IECQ-P JQAJP 13.0002 | | Japan | 2018/05/31 | Current | |
| Secure Components, LLC. | IECQ-P DNVUS 13.0001 | | United States of America | 2013/07/05 | Cancelled | |
| SEMITEC Corporation | IECQ-P JQAJP 13.0003 | | Japan | 2013/04/01 | Cancelled | |
| Shanghai Aviation Electric Co., Ltd. | IECQ-P NQAGB 20.0003 | | China | 2020/06/16 | Current | |
| SHENZHEN MEIKAI ELECTRONICS STOCK CO., LTD. | IECQ-P CEP 13.0002 | | China | 2013/12/03 | Cancelled | |
| SHENZHEN TOUCHWORKS PHOTOELECTRIC CO., LTD | IECQ-P CEP 19.0007 | | China | 2019/06/13 | Current | |
| SHENZHEN YASSY TECHNOLOGY CO., LTD. | IECQ-P CEP 16.0002 | | China | 2016/08/01 | Cancelled | |
| SHENZHEN YASSY TECHNOLOGY CO., LTD. | IECQ-P CEP 13.0001 | | China | 2013/05/24 | Cancelled | |
| Shin Chin Industrial Co., Ltd. | IECQ-P ULTW 12.0009 | | Taiwan | 2018/05/04 | Current | |
| SICHUAN YONGXING ELECTRONICS CO., LTD. | IECQ-P CEP 18.0011 | | China | 2018/11/16 | Current | |
| Siliconware Precision Industries Co., Ltd. | IECQ-P ULTW 12.0011 | | Taiwan | 2012/07/06 | Cancelled | |
| Siliconware Precision Industries Co., Ltd. | IECQ-P ULTW 12.0010 | | Taiwan | 2012/07/06 | Cancelled | |
| Siliconware Precision Industries Co., Ltd. Hsinch... | IECQ-P ULTW 12.0012 | | Taiwan | 2012/07/06 | Cancelled | |
| Siliconware Precision Industries Co., Ltd. | IECQ-P ULTW 12.0013 | | Taiwan | 2012/07/06 | Cancelled | |
| Siliconware Precision Industries Co., Ltd. Hsinchu... | IECQ-P ULTW 12.0015 | | Taiwan | 2012/07/06 | Cancelled | |
| Siliconware Precision Industries Co., Ltd. Hsinchu... | IECQ-P ULTW 12.0014 | | Taiwan | 2012/07/06 | Cancelled | |
| Sin Yu Technology Inc. | IECQ-P ULTW 12.0001 | | Taiwan | 2018/04/24 | Current | |
| SOURIAU Morocco | IECQ-P BSI 14.0014-01 | | Morocco | 2020/09/25 | Current | |
| Souriau Sarthe | IECQ-P BSI 14.0014 | | France | 2020/09/25 | Current | |
| STPI | IECQ-P LCIE 12.0007 | | France | 2018/12/21 | Current | |
| Sunf Pu Technology Co., Ltd. | IECQ-P ULTW 11.0005 | | Taiwan | 2017/11/22 | Cancelled | |
| SUNTRONT TECHNOLOGY CO. LTD. | IECQ-P CEP 19.0016 | | China | 2019/12/16 | Current | |
| Suzhou City Gusu Plating Co., Ltd | IECQ-P BSI 13.0009-04 | | China | 2014/07/10 | Cancelled | |
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