Perceptive slashes Optimer Pharmaceuticals stake to 4.86%

By E. Janene Geiss

Philadelphia, Oct. 23 - Perceptive Advisors LLC has decreased its holding in Optimer Pharmaceuticals, Inc. by 4.64% since July, according to an SC 13G/A filing with the Securities and Exchange Commission.

As of Oct. 3, Perceptive reported a 4.86% passive stake, representing 1,443,729 shares.

It previously reported a passive stake of 9.5%, or an investment of 2,654,055 shares, on July 2, 2008, according to an earlier SC 13G filing.

That stake was a decrease in the holding that it reported as of Dec. 13, 2007, which was 2,854,055 shares, or a 10.25% passive stake, according to an SC 13G filing.

On Oct. 10, 2007, Perceptive reported a 5.58% passive stake, representing 1,292,255 shares, in the San Diego-based biopharmaceutical company, according to another SC 13G filing.

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