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Can you sell a security through a different broker from which it was purchased?
I'm in the US and I once transferred shares in a brokerage account from Schwab to Fidelity.  I received the shares from my employer as RSUs and the employer used Schwab.   After I quit and the shares vested, I wanted to move the shares to Fidelity because that is where all my other accounts are.  I called Fidelity and they were more than happy to help, and it was an easy process.  I believe Schwab charged about $50 for the transfer. The only tricky part is that you need to transfer the cost basis of the shares.  I was on a three-way phone call with Schwab and Fidelity for Schwab to tell Fidelity what the purchase price was.