Lululemon shares dropped significantly after the company lowered its full-year sales forecast. The sportswear maker's signature leggings business saw a notable sales decline. Competitors like Alo and Vuori are gaining market share in athleisure. New CEO Heidi O'Neill faces challenges in regaining customer relevance and sales growth. The company has financial flexibility for a potential operational realignment and cost adjustments.

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…