Facebook's IPO price range is now final, and there will be no amendments to it on Thursday, a source tells CNBC.

This means that the company and its underwriters will be working with its current price range of $34 to $38.

Under the U.S. Securities and Exchange Commission's rules, Facebook can still price up to 20 percent above that range with $45 representing an absolute maximum.

The company is expected to price its IPO on Thursday and begin trading on Friday.