TSI Corp. said it has filed a 2.3 million-share offering ofcommon stock in which the company will sell 2 million sharesand the remainder will be offered by selling shareholders.

The Worcester, Mass., company (NASDAQ:TSIN) is developingdisease models, toxicology tests and animals for use asbioreactors for pharmacological substances. It also provides avariety of preclinical and clinical testing services.

TSI said the selling shareholders will not include executiveofficers or directors. The company would have 19.4 millionshares outstanding after the offering is completed.Underwriters Cowen & Co. and Montgomery Securities have a345,000-share overallotment option.

The stock closed at $11.13, up 13 cents, on Tuesday.

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