 Shares of Blue Apron Inc. APRN, -29.89 were tumbling in Friday trading after the meal-kit company disclosed that it planned to sell stock. The company said in a filing with the Securities and Exchange Commission late Thursday that it has launched into an equity distribution agreement with Canaccord Genuity related to stock-sale plans, under which the meal-kit company may offer and sell up to 30 million in Class A common stock. 