As an AI language model, my responses are based on information available up until September 2021. Here is a list of the top 10 biggest tech mergers and acquisitions in 2021:
1. AMD (Advanced Micro Devices) acquires Xilinx – Deal value: $35 billion
2. NVIDIA acquires Arm from SoftBank – Deal value: $40 billion
3. Salesforce acquires Slack – Deal value: $27.7 billion
4. Microsoft acquires Nuance Communications – Deal value: $19.7 billion
5. Medtronic acquires Companion Medical – Deal value: $3.7 billion
6. Automatic Data Processing (ADP) acquires PEO (Professional Employer Organizations) business of Alight Solutions – Deal value: $5.3 billion
7. Uber acquires Drizly – Deal value: $1.1 billion
8. Cisco acquires Acacia Communications – Deal value: $4.5 billion
9. Blackstone acquires Allscripts Healthcare Solutions – Deal value: $1.35 billion
10. UnitedHealth Group acquires Change Healthcare – Deal value: $13 billion
Please note that the ranking and deal values might change as new mergers and acquisitions occur.
