After a strong rally from multiyear lows in early October, shares of leading chip equipment maker ASML (ASML -0.92%) are falling once again on Dec 30, 2022. While tech stocks have been selling off in general in the final days of 2022, ASML shareholders have an extra reason for worry: Chinese tech giant Huawei just filed for a patent on the same type of advanced chipmaking equipment ASML has a monopoly on.
