Olive Young's first U.S. store in Pasadena, California, drew 6,000 customers on its late May opening weekend, with lines stretching multiple blocks. The South Korean beauty retailer now averages more than 1,600 visitors per day at that location.

The company has since opened a second store in Century City, California, and plans additional U.S. locations. The expansion gives K-beauty a dedicated domestic retail presence for the first time at scale, posing a direct challenge to Ulta Beauty (ULTA).

Ulta dominates specialty beauty retail through its broad product assortment and loyalty program. But Olive Young's stores offer something Ulta does not: a curated K-beauty destination with formulations and brands that have built a devoted following online. Ulta's ability to integrate popular K-beauty brands or develop private-label K-beauty offerings will be a key catalyst to watch. Management commentary on competitive dynamics and product sourcing will matter on upcoming earnings calls. Ulta reports third-quarter earnings in late November.

The K-beauty surge could also weigh on e.l.f. Beauty (ELF). E.l.f. competes on affordable, high-quality products—a value proposition K-beauty shares, with the added draw of distinctive formulations and a strong cultural identity.

Ulta trades at approximately 18 times forward earnings. Sustained pressure from dedicated K-beauty retailers could slow revenue growth and limit margin expansion. That multiple looks harder to defend if Ulta cannot demonstrate it can compete for the K-beauty consumer.