Costco Approves $4 Billion Buyback, Boosts Dividend 12.7% By: Benzinga via Benzinga April 17, 2015 at 17:51 PM EDT Costco Wholesale Corporation (NASDAQ: COST)'s board boosted its quarterly dividend 12.7 percent and approved a new $4 billion buyback ... Read More >> Related Stocks: Costco Wholesale