Lululemon shares tumbled about 18% after the athleisure company cut its full-year outlook again and missed quarterly sales estimates. Sales in the Americas fell 8%, while leggings declined about 20%, adding pressure on incoming CEO Heidi ONeill to revive the brand.

The athletic-apparel maker said second-quarter revenue and net income declined, with weakness on the Chinese mainland following a Great Wall event controversy and adding to…

Lululemon shares tumbled about 18% after the athleisure company cut its full-year outlook again and missed quarterly sales estimates. Sales in the Americas fell 8%, while leggings…