Investing.com -- ASML Holding (NASDAQ: ASML) shares fell 3.7% Wednesday afternoon following reports that Taiwan Semiconductor Manufacturing Co. will postpone deploying the Dutch company’s most advanced lithography machines.

Bloomberg reported that TSMC, ASML’s largest customer according to Bloomberg’s supply chain data, has no current plans to adopt ASML’s latest high numerical aperture extreme ultraviolet lithography machines, or high-NA EUV, for chip production through 2029. The equipment costs upwards of €350 million ($410 million) per unit.

TSMC Deputy Co-Chief Operating Officer Kevin Zhang told reporters the company will continue using current EUV technology, describing the next-generation high-NA EUV machines as "very, very expensive." Zhang made the comments while announcing that TSMC’s leading-edge A13 chip will enter production in 2029.

The decision could pose challenges for ASML, which expects high-NA EUV machines to enter high-volume production in 2027 and 2028. The company is targeting revenue of as much as €60 billion in 2030, with adoption of the advanced equipment being closely monitored by investors.