How many shares can the account receive?

After the IPO process concludes and shares have been distributed, an email will be sent confirming the number of shares allocated to your account, if any.

The confirmed allocation will also appear in:…

There is no guarantee that you will receive any shares, or that you will receive the full number of shares you have requested. In popular IPOs, demand often exceeds the number of shares available (a situation known as "oversubscription"). When this happens, the bookrunners will scale back allocations, meaning each investor may receive only a proportion of the shares they applied for — or, in some cases, none at all…

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)…