The U.S. has spent years trying to choke off China's access to advanced chipmaking technology.

Yet one number from ASML Holding N.V.'s (NASDAQ:ASML) latest earnings call suggests the world's biggest semiconductor equipment maker is still doing plenty of business there.

"We still look at China as approximately 20% of our total net sales," said CFO Roger Dassen.

China accounted for roughly 20% of ASML's second-quarter revenue, a reminder that the chip war hasn't shut the country out of the semiconductor supply chain—it has simply changed what China is buying. • ASML Holding stock is showing positive momentum.

Where is ASML stock headed?.