JOINT FILING AGREEMENT
| CUSIP NO. 982526 10 5 | 13D |
EXHIBIT 1
In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the
persons named below agree to the joint filing on behalf of each of them of a statement on Schedule
13D (including amendments thereto) with respect to the Common Stock of Wm. Wrigley Jr. Company and
further agree that this Joint Filing Agreement be included as an Exhibit to such joint filing.
In evidence thereof, the undersigned, being duly authorized, have executed this Joint Filing
Agreement this 24th day of October, 2007.
| /s/ Xxxxxxx Xxxxxxx, Xx. | ||||
| Xxxxxxx Xxxxxxx, Xx. | ||||
| WRIGLEY PRIVATE TRUST COMPANY |
||||
| By: | /s/ Xxxx Xxxxxxx | |||
| Name: | Xxxx Xxxxxxx | |||
| Title: | Vice President | |||
