 NEW YORK--BUSINESS WIRE--Halper Sadeh LLP, a global investor rights law firm, is investigating whether the sale of Proofpoint, Inc. NASDAQ: PFPT to Thoma Bravo is fair to Proofpoint shareholders. Under the terms of the merger agreement, Proofpoint stockholders will receive 176.00 per share in cash. Halper Sadeh encourages Proofpoint shareholders to click here to learn more about their legal rights and options or contact Daniel Sadeh or Zachary Halper at 212 763-0060 or sadehhalpersadeh. 