Pennystocksinsiders.com released FREE insider trading reports for US market investors to track the following active stocks and penny stocks : AK Steel , Pfizer , Chesapeake Energy , Plug Power , Twitter , and RF Micro Devices . AK Steel Holding Corporation : By the end of last trading, the AK Steel shares earned US$0.01 to US$6.63 with about 14.13 million shares exchanging hands for the session, compared to its average volume of 16.75 million shares.