Heather Bresch, CEO of Mylan.

Check out the companies making headlines after the bell on Wednesday:

Shares of Tailored Brands plummeted nearly 20 percent after the bell, despite reporting first-quarter earnings and revenue that beat analysts' expectations. The retail holding company reported earnings per share of 50 cents on revenue of $818 million, beating analysts' estimates of 48 cents a share on $794 million in revenue. Tailored Brands missed on comparable-store sales, however, reporting 2.1 percent same-store sales, falling short of the 2.5 percent analysts had expected. Tailor Brands, which owns brands like Men's Wearhouse and Jos. A Bank, also reduced its debt by $110 million in the first quarter.