They have an option to do an ACATS to another brokerage account. They do not mention specifically, but it looks like this would be considered a stock transfer "in kind" which should not be considered a taxable event.

https://old.reddit.com/r/Fidelity/comments/la7tj6/can_someon...

https://cash.app/help/5026-transferring-stock-to-another-bro...