Deliveries slipped 1.1 percent at Hyundai, though the company said retail volume rose 1 percent to an October record of 52,767.
A Hyundai spokesman said the company's dealer stock stood at 19,894 at the end of last month, off 26 percent from 26,717 at the close of September and down 86 percent from 142,616 at the end of October 2020.
Kia deliveries dropped 7.2 percent to 52,067, with 82 percent of the company's inventory sold during the month.
"Despite ongoing supply chain issues and chip shortages, we expect our available supply and robust customer interest will help us have a strong finish to the year," Eric Watson, vice president for sales operations at Kia America, said in a statement.
Subaru saw deliveries skid for the fifth straight month behind a 40 percent drop in volume last month.
Every Subaru nameplate but the WRX/STI posted a decline, with sales of the top-selling Forester plunging 67 percent to 4,820.
Thomas J. Doll, CEO of Subaru of America, blamed the latest results -- the company's sharpest decline of the year -- on "a severe shortage of semiconductor chips and other key components that directly impacts our vehicle production."
Genesis said deliveries rose 403 percent last month to 5,300, with the luxury brand's two crossovers once again combining to easily outsell combined sales of the company's three sedans.
Mazda reported lower sales for the second straight month, with October deliveries down 14 percent.
Volvo will also post October results later Tuesday. Ford Motor Co. will report sales for the month on Wednesday. The rest of the industry releases sales on a quarterly basis.