Can a client write covered calls against stock which has been loaned out through the Stock Yield Enhancement Program and receive the covered call margin treatment?

Yes. A loan of stock through the Stock Yield Enhancement Program has no impact upon its margin requirement on an uncovered or hedged basis since the lender retains exposure to any gains or losses associated with the loaned position.

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Will my taxes be different if I am a US taxpayer?
Do participants in the Stock Yield Enhancement Program receive dividends on shares loaned?
Can a client write covered calls against stock which has been loaned out through the Stock Yield Enhancement Program and receive the covered call margin treatment?
What happens to stock that is the subject of a loan and is subsequently halted from trading?