What are fully-paid and excess margin securities?

Fully-paid securities are securities in a customer's account that have been completely paid for. Excess margin securities are securities that have not been completely paid for, but that represent the aggregate loan value and market value of each class or series of security required to be segregated for each client as determined under CIRO Rule 4316 divided by the loan or market value, as the case may be, of one unit of the security.

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What is meant by Current Excess Liquidity?
What is excess liquidity and what happens if my account has negative excess liquidity?
Why are my shares not being lent, even though I am enrolled in the Stock Yield Enhancement Program (SYEP)?
How does IBKR determine the amount of shares which are eligible to be loaned?