 NEW YORK--BUSINESS WIRE--Halper Sadeh LLP, a global investor rights law firm, is investigating whether the merger of ADTRAN, Inc. NASDAQ: ADTN and ADVA is fair to ADTRAN shareholders. Following completion of the transaction, ADTRAN shareholders are expected to own approximately 54 of the combined company. Halper Sadeh encourages ADTRAN 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 sadehhalpersad 