Facebook stocked opened at US $19.93 a share on Wednesday and saw a low of US $19.45 after a report about Facebook resisting  attempts  by the U.S. Securities and Exchange Commission to disclose more about the advertising revenues from mobile.

A Bloomberg News article  talks about letters between Facebook and the SEC’s corporation finance division, which oversees what publicly traded companies disclose in regulatory filings before their initial public offerings.

The letters, made public by the SEC, “depict a management team hesitant to disclose information and still guessing at even rudimentary aspects of its business just weeks before the company held the largest-ever technology initial public offering,” Bloomberg News reported. “Many of the issues raised by the SEC and now unnerving investors were foreshadowed in the then-private correspondence between the SEC and Facebook.”