CAMBRIDGE, Mass.--(BUSINESS WIRE)--Dyax Corp. (NASDAQ: DYAX) today announced the pricing of a public offering of 5,500,000 shares of its common stock. The offering is expected to close on or about October 5, 2009, subject to the satisfaction of customary closing conditions. In addition, Dyax has granted the underwriter a 30-day option to purchase up to an additional 825,000 shares of common stock to cover over-allotments, if any.