- Tung San Sec. Co Ltd.
- Typhone Securities Co Ltd.
- Tzoong Fwu Sec. Co Ltd.
- UBS AG TAIPEI BRANCH
- UBS GLOBAL ASSET MANAGEMENT (TAIWAN) LTD
- UNION BANK OF TAIWAN
- UNITED OVERSEAS BANK LIMITED
- Ubs Securities Pte. Ltd. Taipei Branch
- Unite And Prosper Securities Co Ltd
- United Securities Co., Ltd.
- Universal Securities Co. Ltd.
- WELLS FARGO BANK N.A., TAIPEI BRANCH
- WELLS FARGO BANK, N.A., TAIPEI BRANCH (FORMERLY KNOWN AS WACHOVIA)
- Wall Street Sec. Co Ltd.
- Wan Sheng Securities Co. Ltd.
- Wan Tai Securities Co Ltd
- Wanshing Securities Co Ltd
- Waterland Securities Co. Ltd
- Well-phone Securities Co Ltd
- Winner Securities Co., Ltd.
- Worldwide Securities Co Ltd
- Wu Gou Securities Co Ltd
- YUANTA COMMERCIAL BANK CO., LTD.
- Yang-fa Securities Co Ltd
- Yie Chang Securities Co Ltd
- Ying Yi Securities Co., Ltd.
- Young Ming Securities Co Ltd
- Yu Li Securities Co Ltd
- Yuan Tung Securities Co Ltd.
- Yuan-lin Securities Co Ltd
- Yuanta Securities Company Limited
- Yung Chong Securities Co Ltd
- Yung Chuan Securities Co., Ltd.
- Yung Li Securities Co., Ltd.
- Yung Sheng Securities Co Ltd
- Yung Shin Securities Co., Ltd.