Are shares received through the IPO eligible for the Stock Yield Enhancement Program?

Yes. Shares received through an US IPO allocation are eligible to be utilized in the Stock Yield Enhancement Program once the IPO shares are settled (IPO first trade date + 2 business days). 

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Are IPO Shares eligible for margin?
Are shares loaned only to other IBKR clients or to other third parties?
Can I participate in the Stock Yield Enhancement Program if I have an IRA account?
Do participants in the Stock Yield Enhancement Program receive dividends on shares loaned?