Check out which companies are making headlines after the bell Wednesday:
GNC - The health and nutrition products retailer said it has acquired Discount Supplements, a multi-brand sports nutrition e-commerce retailer in the United Kingdom. Financial terms of the deal were not immediately available. Shares were unchanged in extended-hours trading.
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Praxair - The industrial gas producer and supplier increased its credit agreement to $2 billion from $1.75 billion, according to the company's 8-K filing. Shares were unchanged in extended-hours trading.