X0306 4 2014-10-10 0 0000104207 WALGREEN CO WAG 0001040208 Rosenstein Barry C/O JANA PARTNERS LLC 767 FIFTH AVENUE, 8TH FLOOR NEW YORK NY 10153 1 0 0 0 0001159159 JANA PARTNERS LLC 767 FIFTH AVENUE, 8TH FLOOR NEW YORK NY 10153 1 0 0 0 Common Stock, par value $.078125 per share ("Common Stock") 2014-10-10 4 P 0 350000 62.8 A 12850000 I See footnote Common Stock 2014-10-13 4 P 0 550000 62.02 A 13400000 I See footnote Common Stock 2014-10-14 4 P 0 350000 60.68 A 13750000 I See footnote JANA Partners LLC ("JANA") is a private money management firm which beneficially owns 13,750,000 shares of the Issuer's common stock through various accounts under its management and control. Barry Rosenstein is the Managing Partner of JANA. JANA and Barry Rosenstein disclaim any beneficial ownership of any of the Issuer's securities reported herein except to the extent of their pecuniary interest therein. JANA may be deemed to be a director by virtue of the fact that Barry Rosenstein, Managing Partner of JANA, currently serves on the board of directors of the Issuer. /s/ Barry Rosenstein 2014-10-14 /s/ JANA Partners LLC by Jennifer Fanjiang, General Counsel 2014-10-14