How did Under Armour's stock move after splitting?

Rarely will you see a major company’s stock price drop by half under less exciting circumstances. Under Armour Inc.’s shares opened Friday down 47 percent at $45.26 following a long-planned stock split. Prices didn’t move much afterwards, slipping 5 percent to $42.74 during afternoon trading. But, no, investors’ holdings aren’t really down by half. In other words, shares of Baltimore-based Under Armour (NYSE: UA) hovered around expected levels following a two-for-one stock split after the close…

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