Allena Pharmaceuticals, Inc. announced that it has entered into a securities purchase agreement with an investor for the issuance and sale of an aggregate of 1,436.0688 shares of its Series D Convertible Preferred Stock, and 1,436.0688 shares of its Series E Convertible Preferred Stock in a registered direct offering for an aggregate gross proceeds of approximately $2.8 million, before deducting placement agent fees and other offering expenses.