"With a little help from their bankers, hedging by CEOs, directors, and other senior executives may deprive investors of clues about impending problems at companies" http://www.businessweek.com/magazine/content/10_10/b4169044647894.htm "..The complex transactions are structured so that executives still technically own the shares. And though some really big hedges get noticed at the time they are made, disclosures of hedging are often vague or buried deep in the footnotes of obscure public filings. ..."