WILMINGTON, Mass.--(BUSINESS WIRE)--June 12, 2006--Charles River Laboratories International, Inc. (NYSE: CRL - News), today announced the closing of its sale of $300 million principal amount of Convertible Senior Notes due 2013 in an offering to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended. The net proceeds from this offering were approximately $293 million, after deducting estimated discounts, commissions and expenses.