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| Manufacturer | CB Certificate No. | IECQ Certificate No. | | CB/NAI | Issue Date | Status | |
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| WAFER WORKS CORP (Semiconductor Material... [Taiwan] | |
| Wafer Works Corporation [Taiwan] | |
| Walsin Lihwa Corp [Taiwan] | |
| Walsin Technology Corporation [Taiwan] | |
| Weald Electronics Limited [United Kingdom] | |
| Wearness Electronics Zhongshan Ltd [China] | |
| Well Fortune Technical Co, Ltd [Taiwan] | |
| Welwyn Components Limited [United Kingdom] | |
| | E1269/F | Q-IECQ BSI 05.0009 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E1266/F | Q-IECQ BSI 05.0005 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E1178/F | Q-IECQ BSI 05.0003 | | BSI (United Kingdom) | 2005/01/18 | Cancelled | |
| | E1069/F | Q-IECQ BSI 05.0024 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E1063/F | Q-IECQ BSI 05.0022 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E1059/F | Q-IECQ BSI 05.0023 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E1054/F | Q-IECQ BSI 05.0021 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E1053/F | Q-IECQ BSI 05.0020 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E1046/F | Q-IECQ BSI 05.0069 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E0988/F | Q-IECQ BSI 05.0025 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E0972/F | Q-IECQ BSI 05.0050 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E0961/F | Q-IECQ BSI 05.0049 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E0470/N | Q-IECQ BSI 05.0039 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E0245/N | Q-IECQ BSI 05.0047 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E0243/N | Q-IECQ BSI 05.0042 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E0243/N | Q-IECQ BSI 05.0042 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E0241/N | Q-IECQ BSI 05.0044 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E0240/N | Q-IECQ BSI 05.0045 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E0235/N | Q-IECQ BSI 05.0046 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E0146/F | Q-IECQ BSI 05.0051 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| | E0085/F | Q-IECQ BSI 05.0019 | | BSI (United Kingdom) | 2004/01/07 | Cancelled | |
| WENZHOU LUCHENG ZHENGTAI RESISTOR CO, LT... [China] | |
| Wide Band Signal Processing Lab, EW, ICR... [Taiwan] | |
| WILLIAMSON ELECTRONIQUE [France] | |
| WIMA-Kondensatorenfabrik [Germany] | |
| Winbond Electronics Corporation [Taiwan] | |
| WINSTEK SEMICONDUCTOR CORPORATION [Taiwan] | |
| Winstek Semiconductor Co, Ltd Reliabilit... [Taiwan] | |
| Woo Sung Pre Ind Co, Ltd [Korea, Republic of] | |
| WUHAN GUANXING ELECTRONIC CO, LTD [China] | |
| WUHAN TELECOMMUNICATION DEVICES CO, LTD [China] | |
| WUXI CHINA RESOURCES HUAJING MICROELECTR... [China] | |
| WUXI SHARP ELECTRONIC COMPONENTS CO, LTD [China] | |
| WUXI TOYO ELECTRIC CO, LTD [China] | |
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