AMD's overall X86 market share at the and of Q3 2020 reached 22.4%. The desktop CPU market share is already higher than 20% and, with the launch of the Ryzen 5000 CPUs, it may quickly climb to new all-time-highs in the next few quarters. Thanks to the success recorded by the Renoir APUs, AMD's notebook market share also reached an all-time-high 20.2%, while the server sector is not doing that great with only 6.6% market share.
https://www.notebookcheck.net/AMD-hits-highest-overall-X86-market-share-in-13-years.501819.0.html