Shares in Qiagen hit a 52-week high of $15.58 earlier this week before closing at $14.91 on Tuesday, up 8.4 percent for the tracking period. Shares in Qiagen, which led gains among all issues in the BCW Index, have risen 32.5 percent over the past month.

Meanwhile, Bio-Rad shares dropped 11.9 percent for the week, leading all decliners. Last week, the firm reported that its fourth-quarter profit and revenue were hit by costs associated with a legal dispute (see feature).

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