Zoom has entered into a definitive agreement to buy 20-year-old cloud-based software company Five9 in a $14.7 billion all-stock deal. It is Zoom's largest-ever acquisition deal so far and the second-biggest US tech deal this year after Microsoft's announcement to buy Nuance for $16 billion. Snapdeal's ex-Chief Product Officer Anand Chandrasekaran is the Executive VP of Product Management at Five9.