Isilon Systems Inc. (NasdaqGM: ISLN) enjoyed a profitable day Monday, jumping 28.45 percent in price to close at $33.77. Volume in ISLN was 35,703,591 shares, compared to a daily average of just over one million. On Monday, EMC Corp. said it has signed a $2.25 billion deal to acquire Isilon Systems Inc. in yet another step in the consolidation of the increasingly important data-storage industry.

PowerShares QQQ (NasdaqGM: QQQQ) traded widely Monday in 56,163,936 shares. The figure was still below its three-month daily average of 73,899,700. The stock suffered in price, though, 0.37 percent to $52.31.

Aastrom Biosciences Inc. (NasdaqCM: ASTM) fell in price Monday’s trading by 15.48 percent to $3.55. Volume in ASTM was 4,168,049, or about four times its normal daily average. The Ann Arbor, Mich.-based company is a leading developer of expanded autologous cellular therapies for the treatment of severe cardiovascular diseases.