Will you receive all the shares you have requested?

No, fractional shares cannot be transferred via ACATS. 

What happens to fractional shares during a full ACATS transfer:…

IBKR's Role in an IPO

In the context of an IPO, IBKR generally acts as a financial intermediary, meaning it provides the platform through which eligible investors can register their interest, submit subscription orders and, if shares are allocated to them, receive those shares into their IBKR account(s)…

The number of shares received by each account is dependent on the total number of shares allocated to Interactive Brokers. This number is variable.  US IPO allocations are affected by supply and demand, valuation, and general market dynamics. In the event that the offering is completed, you may receive an allocation of your full requested quantity of shares, part of your requested quantity of shares, or of no shares. …

A Conditional Offer to Buy (COB) is an indication of interest to purchase a specified number of shares in an IPO at the Public Offering Price, contingent upon the registration statement becoming effective with the Securities and Exchange Commission (SEC). Submitting a COB does not guarantee an allocation of shares. The COB represents an investor's intent to purchase shares if the offering proceeds and if they receive an allocation…