Yong Fang Yi

President at RS TECHNOLOGIES CO., LTD.

Net worth: 432 M $ as of 2026-08-30

56 year

Producer Manufacturing

Electronic Technology

Profile

Yong Fang Yi currently works at LE System Co., Ltd., as Chief Executive Officer & Representative Director, RSTEC Semiconductor Taiwan Co. Ltd., as Chairman from 2015, Beijinng GRINM RS Semicondactor Materials Co., Ltd., as Chairman from 2018, RS Technologies Co. Ltd., as President & Representative Director from 2010, and DG Technologies Co., Ltd., as Director from 2019.

Known holdings in public companies

Company	Date	Number of shares	Valuation	Valuation date
RS TECHNOLOGIES CO. LTD. 43.82%	2025-12-30	11,655,000 ( 43.82% )	429 M $	2026-08-30
Sanden Corp. Sanden Corp. Industrial MachineryProducer Manufacturing Manufactures, develops, and sells automobile equipment 1.78%	2025-12-30	2,005,500 ( 1.78% )	2 M $	2026-08-30

Yong Fang Yi active positions

Companies	Position	Start
RS TECHNOLOGIES CO., LTD.	President	2010-12-09
RSTEC Semiconductor Taiwan Co. Ltd. RSTEC Semiconductor Taiwan Co. Ltd. SemiconductorsElectronic Technology Manufactures devices related to semiconductors	Chairman	2015-11-30
Beijinng GRINM RS Semicondactor Materials Co., Ltd.	Chairman	2017-12-31
DG Technologies Co. Ltd. DG Technologies Co. Ltd. Industrial MachineryProducer Manufacturing Manufactures and sells consumable parts for semiconductor manufacturing equipment	Director/Board Member	2018-12-31
LE System Co., Ltd. LE System Co., Ltd. Electrical ProductsProducer Manufacturing Develops, manufactures and sells redox flow batteries	Chief Executive Officer	-

All active positions of Yong Fang Yi

Experiences
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Linked companies

Private companies	5
RS Technologies Co. Ltd. RS Technologies Co. Ltd. Industrial MachineryProducer Manufacturing Engages in silicon wafer reclaim and wafer oxide film coating services as well as semiconductor wafer manufacturing consulting services	Producer Manufacturing
LE System Co., Ltd. LE System Co., Ltd. Electrical ProductsProducer Manufacturing Develops, manufactures and sells redox flow batteries	Producer Manufacturing
RSTEC Semiconductor Taiwan Co. Ltd. RSTEC Semiconductor Taiwan Co. Ltd. SemiconductorsElectronic Technology Manufactures devices related to semiconductors	Electronic Technology
Beijinng GRINM RS Semicondactor Materials Co., Ltd.
DG Technologies Co. Ltd. DG Technologies Co. Ltd. Industrial MachineryProducer Manufacturing Manufactures and sells consumable parts for semiconductor manufacturing equipment	Producer Manufacturing