All you need to do is check FINRA's daily list and do a little research on the deleted tickers. It's about average for SEC filers that are suspended for not keeping the filings up to date to be deleted in 2 to 3 years. Sometimes non filers can hang on for years but SEC filers don't get to hang around that long. KMAG is a non filer that was suspended about 4 years ago and has not been deleted yet. Maybe another year or two of practically no volume will cause it to be deleted. TECO doesn't have that much time as a suspended delinquent filer.