2 3 agreement or other material instrument or result in the creation or imposition of any lien, security interest, pledge or other encumbrance upon any properties or assets of the Company. The Company has no subsidiaries. Upon the execution and...Subscription Agreement • February 6th, 1998 • Bb Biotech Ag • Delaware
EXHIBIT 4Joint Filing Agreement • November 19th, 1998 • Bb Biotech Ag
3.4 ISSUANCE AND DELIVERY OF SHARES. The Shares, when issued and paid for in compliance with the provisions of this Agreement, will be validly issued, fully paid and nonassessable. The issuance and delivery of the Shares is not subject to preemptive,...Share Purchase Agreement • February 10th, 1998 • Bb Biotech Ag • Ontario
1 AVIRONCommon Stock Purchase Agreement • December 24th, 1997 • Bb Biotech Ag • California
(If no exceptions, write "none." If left blank, response will be deemed to be "none.") 2 Please confirm that the foregoing correctly sets forth the agreement between us by signing in the space provided below for that purpose.Stock Purchase Agreement • May 27th, 1998 • Bb Biotech Ag • Delaware
1 EXHIBIT 4 JOINT FILING AGREEMENT We, the undersigned, hereby express our agreement that the attached Schedule 13D (including all amendments thereto) is filed on behalf of each of the undersigned. Date: December 31, 1997Joint Filing Agreement • January 5th, 1998 • Bb Biotech Ag
JOINT FILING AGREEMENTJoint Filing Agreement • February 10th, 1998 • Bb Biotech Ag
1 EXHIBIT 4Joint Filing Agreement • December 24th, 1997 • Bb Biotech Ag
1 SERIES B PREFERRED STOCK PURCHASE AGREEMENT Alexion Pharmaceuticals, Inc. 25 Science Park New Haven, CT 06511 Ladies & Gentlemen: The undersigned, Biotech Target S.A. (the "Investor"), hereby confirms its agreement with you as follows: 1. This...Preferred Stock Purchase Agreement • September 19th, 1997 • Bb Biotech Ag • Delaware
JOINT FILING AGREEMENTJoint Filing Agreement • July 23rd, 1998 • Bb Biotech Ag
1 Exhibit H JOINT FILING AGREEMENT We, the undersigned, hereby express our agreement that the attached Amendment No. 2 to a statement on Schedule 13D for the event dated February 23, 1996, is filed on behalf of each of the undersigned. Date: March 13,...H Joint Filing Agreement • March 15th, 1996 • Bb Biotech Ag
JOINT FILING AGREEMENTJoint Filing Agreement • May 28th, 1998 • Bb Biotech Ag
1 JOINT FILING AGREEMENTJoint Filing Agreement • July 23rd, 1998 • Bb Biotech Ag
