TOKYO, June 3 /PRNewswire/ -- Astellas Pharma Inc. (TSE: 4503) announced today the completion of the initial tender offer for all outstanding shares of common stock in OSI Pharmaceuticals, Inc. (Nasdaq: OSIP). The initial offer period expired at 12:00 midnight, New York City time, on June 2, 2010. Computershare Trust Company, N.A., the depositary for the tender offer, has advised that a total of 48,415,727 shares were validly tendered and not withdrawn prior to the expiration of the initial offer period, representing approximately 79% of OSI's issued and outstanding shares. All shares validly tendered and not withdrawn have been accepted for payment. 5,014,478 additional shares were tendered subject to guaranteed delivery procedures prior to the expiration of the initial offer period. The total number of shares validly tendered, plus the shares tendered subject to guaranteed delivery procedures, represents approximately 87% of OSI's issued and outstanding shares. Astellas also announced today that it would make available a subsequent offer period commencing immediately and expiring at 12:00 midnight, New York City time on June 7, 2010, unless extended. During the subsequent offer period, any shares validly tendered will be immediately accepted for payment, and tendering stockholders will promptly thereafter be paid $57.50 per share in cash, less any withholding taxes and without interest, which is the same amount per share that was offered and paid to OSI stockholders who previously tendered into the initial offer. The procedures for tendering shares during the subsequent offer period are the same as during the initial offer period, except that shares tendered during the subsequent offer period may not be tendered by the guaranteed delivery procedure and may not be withdrawn. Following the expiration of the subsequent offer period, if Astellas owns at least 90% of the issued and outstanding shares of OSI common stock, Astellas intends to complete the acquisition of OSI through the short-form merger procedure under Delaware law, by which the companies can complete the merger without a meeting of OSI's stockholders. In the merger, each outstanding share of OSI common stock not tendered and purchased in the initial offer period or the subsequent offer period will be converted into the right to receive the same consideration provided in the initial offer, except for such shares for which appraisal rights have been validly asserted. As a result of the merger, which Astellas expects to close as soon as practicable, OSI's common stock will cease to be traded on the Nasdaq Global Select Market. Citigroup is acting as exclusive financial advisor to Astellas and Morrison & Foerster LLP is acting as legal counsel.