There are two categories of suspended stocks. The

There are two categories of suspended stocks. The first category are tickers suspended for delinquent filings. The second category are tickers suspended for "questions" -- demoted to the Grey Sheets pending litigation which can take years. SKTO/AEGY are in the second category. MMs won't sponsor these tickers because of the uncertainty of regulatory investigation.

List of suspended tickers going back to 1995
www.sec.gov/litigation/suspensions.shtml