For years, Micron Technology, Inc. (NASDAQ:MU) was the go-to stock for U.S. investors looking to ride the AI memory boom. Now, it has company. SK hynix Inc‘s (NASDAQ:SKHY) recent Nasdaq debut has brought one of the world’s largest memory chipmakers directly to U.S. investors, setting up a fresh rivalry between two companies at the center of the artificial intelligence infrastructure buildout.