With so many people with the experience they have at AMBS...there is absolutely no excuse should a late filing occur. I know many here (INCLUDING MUSELF) who has emailed the company asking about the 10-k. Plus they filed the extension so they know exactly when it is due. With all that said, I say the 10-K has been filed or they have been bought out! Lol wishful thinking.
Those that know, don't say; and those that say, don't know.