The main reason is that brokerage does not offer trading service for U.S. stock market. If you want to keep the stock, what you need to do is: 1. Find a brokerage that allow U.S. trading (like Charles Schwab) and open an account. 2. Transfer your stock to that new account It will be automatically converted.
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If you want to keep the stock, what you need to do is:
1. Find a brokerage that allow U.S. trading (like Charles Schwab) and open an account.
2. Transfer your stock to that new account
It will be automatically converted.