| 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] | |
| | T1072-3 | M-IECQ ECCB 07.0003 | | ULTW (United States of America) | 2007/05/08 | Cancelled | |
| | T1072-1 | M-IECQ ECB 04.0074 | | ULTW (United States of America) | 1996/04/24 | Cancelled | |
| Weald Electronics Limited [United Kingdom] | |
| Wearness Electronics Zhongshan Ltd [China] | |
| Well Fortune Technical Co, Ltd [Taiwan] | |
| Welwyn Components Limited [United Kingdom] | |
| 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 CMC ELECTRONICS CO, LTD [China] | |
| WUXI SHARP ELECTRONIC COMPONENTS CO, LTD [China] | |
| WUXI TOYO ELECTRIC CO, LTD [China] | |
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