Amazon, Microsoft and Google have made a steady stream of acquisitions to support their cloud efforts in recent years.
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These vendors are far from acquisition-happy though. Many times these vendors will use their own in-house talent to create their products and services.
Every once in a while they will buy a technology though to augment their platform though. Amazon was the latest with its acquisition of NICE. Check out the timeline of the acquisitions we were able to confirm by these companies. And keep in mind, there may have been others that have not been made public.