Mar. 30, 2012: $2.62
Dec. 31, 2011: $2.40
Quantum shares increased more than 10 percent on Feb. 15 to a quarter-high close of $2.78 after reporting strong earnings. They fell to $2.35 a couple weeks later before rebounding again by the end of the quarter. It's a marked improvement for the company compared to 2011, when Quantum shares lost more than a third of their value.