Are Stock Yield Enhancement Program loans made only in increments of 100?

No, unfortunately it is not possible to disable share lending with respect to the protection and hypothecation rules of the SEC or the Stock Yield Enhancement Program for an individual security. The only way to prevent a security from being lent is by owning all of your securities outright (no margin loan) and by not participating in the Stock Yield Enhancement Program. …

There is no impact on capital gain treatment upon the sale of shares that have been lent through the Stock Yield Enhancement Program.

The lender of the securities is entitled to receive the amount of all dividends and distributions made on loaned securities through the Stock Yield Enhancement Program. …

In the event that the demand for borrowing a given security is less than the supply of shares available to lend from participants in the Stock Yield Enhancement Program, loans will be allocated on a pro rata basis. 

Example…

In the event that the demand for borrowing a given security is less than the supply of shares available to lend from participants in our Stock Yield Enhancement Program, loans will be allocated on a pro rata basis (e.g. if aggregate supply is 20,000 and demand is 10,000, each client will be eligible to have 50% of his/her shares lent)…