The paper trading account performs locates on shares that are readily available to borrow using production data. It does not offer the ability to pre-borrow shares.
Can I pre-borrow shares in a paper trading account?
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Is live data provided for paper trading accounts?
Why did some of my paper trading orders show as filled after the close?
How can I practice with the TWS?
How can I pre-borrow or reserve shares for short selling?