On the IBKR trading screen, enter a common stock symbol followed by a space and "PR" for preferred followed by the series. For example, stock XYZ Preferred Series A Shares would be entered as "XYZ PRA". Type "XYZ PRA" into the Financial Instrument column, hit Enter on your keyboard, and select Stock (Smart) from the contract selection pop up to add that symbol to your trading screen.
How do I enter a symbol for a preferred stock?
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Can a security be transferred into my account?
How can I confirm if a security is available for trading?
How do I create a stock spread order in TWS?
How can I find all preferred stocks of a company?