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Why did the price of ASH common stock drop when the market opened on May 15, 2017?
Ashland Global Holdings Inc. (ASH) sold off their ownership in Valvoline Inc. (VVV).  Friday, May 12 was the distribution date of the sale; at the end of the day, every stockholder of ASH received 2.745338 shares of VVV stock for each share of ASH held.  That is why the value of ASH has dropped significantly on open this morning. Sources: