Wall Street Journal:

The Securities and Exchange Commission has opened an informal inquiry into the online postings of Whole Foods Market Inc.'s Chief Executive John Mackey, according to people familiar with the matter.

The SEC is likely to examine whether Mr. Mackey's comments contradicted what the company previously said, or if they were overly optimistic about the firm's performance. In addition, the SEC will likely look at whether the CEO selectively disclosed material corporate information -- that could violate a securities law passed in 2000 known as Regulation Fair Disclosure, which was designed to prevent executives from sharing information with favored clients or analysts.