Arrayit Corporation (ARYC)

[MikeCr]

Actually those 2.8 million shares traded after 4 pm were a "form T" trade

Incredible Penny Stocks: What is a Form T-Trade?

There is much confusion and rumor regarding “T Trades” in the penny stock market. Nasdaq Pink Sheet stocks often close at a certain price and, within 3-10 minutes after the closing bell, will show a large final trade that gets labeled as an “after hours” trade. Simply put, this is an inaccurate description of that trade.....

....To avoid creating “an unbalanced market”, market makers often do not report certain trades during the day to the public and then use a T Trade not to “scare” investors into thinking a market for that stock is going in one direction or the other at the spurring of one large investor.

If a market maker wants to accumulate a large amount of a stock in one trading day, that market maker may actually not report any of the trades that occurred until the trading day has ended so as not to alert the market to the collection. This practice is completely legal under the FINRA rules of the OTC Markets so long as the trade is reported at the end of the day.

https://incrediblepennystocks.wordpress.com/2013/06/25/incredible-penny-stocks-what-is-a-form-t-trade/