Weekend Follies: Press Releases While Nobody's Looking

Ten culprits this Good Friday Weekend. I try to catch companies issuing substantive news at odd-ball hours during the weekend.

Two NYSE listings: Walmart (WMT) and AON Corp (AON).

Three AMEX listings: Aspyra (APY), National Health Realty (NHR), YM Biosciences (YMI).

Five on Nasdaq: Dynacq Healthcare (DYII), State Bancorp (STBC), Yahoo (YHOO), Central Valley Bancorp (CVCY) and Moldflow (MFLO).

Caveat Emptor when dealing with companies issuing news at strange times...