Check out which companies are making headlines after the bell Wednesday:
Herman Miller - The stock gained after the interior designing firm reported first-quarter earnings of 42 cents per share on $509.7 million in sales.
United Natural Foods - The grocery distributor said its full-year sales increased by 14 percent year-over-year to $6.79 billion, sending shares nearly 5 percent higher in after-hours trading.
Pier 1 Imports - Shares tanked after the home furniture retailer posted weaker-than-expected second-quarter results and cut its full-year outlook, citing slowing growth in e-commerce sales.
Diamondback Energy - The oil and natural gas company said it plans to offer 2.5 million shares of common stock. The stock fell about 3 percent after the announcement.
Flexion Therapeutics - Shares plunged as much as 26 percent after the FDA said it had placed a clinical hold on a mid-stage trial of the company's experimental pain drug.
WhiteWave - The food packager said it completed an offering of $500 million of 5.375 percent senior notes due in 2022. Shares rose about a half a percent after the announcement.
EPR Properties - The specialty real estate investment trust announced a 3.2 million common stock offering, sending shares lower after the bell.
—By CNBC's Karma Allen
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